Tag Archives: thunderstorm

Severe Weather 101 – Severe Weather Awareness Week wrap up

Supercell thunderstorms like this can be beautiful - but they can also be deadly. Do you know what to do when severe weather strikes? (Stormscape Photography / FLICKR)
Supercell thunderstorms like this can be beautiful – but they can also be deadly. Do you know what to do when severe weather strikes? (Stormscape Photography / FLICKR)

Over the past week we have highlighted some of the severe weather hazards that we face in Colorado every spring and summer in our Severe Weather 101 series.  The dangers these present are significant and not to be taken lightly.

Tornadoes grab most of the headlines and certainly are a danger however others like lightning and flooding are more common and actually claim more lives.  We ask all of our readers to please, take the time to review these important articles – they could save yours and your family’s lives!

The National Weather Service has published a nice wrap up of Severe Weather Awareness Week that covers all the basics – see it below.  For more in depth information, please use the links at the bottom to view each article on our Severe Weather 101 series.  Be safe and be weatherwise!

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
600 AM MDT SAT APR 16 2022

SEVERE WEATHER AWARENESS WEEK IN REVIEW

Severe Weather Awareness Week in review…

Severe Weather Awareness Week in Colorado concludes today. During the past week we have presented information and safety rules for tornadoes, lightning and wildfires, floods and flash floods, straight-line thunderstorm winds, hail, and our warning programs.

We will now review some of the most important safety rules in our effort to build a Weather-Ready Nation.

Be weather-wise by staying informed on expected weather in your area. The National Weather Service is typically aware of the potential for severe weather many hours or even days before any severe weather watches or warnings are issued, providing forecast products to heighten your awareness. A Weather Story product is posted each day on National Weather Service Internet pages and Facebook pages which includes a map and text on possible hazardous weather expected within the next seven days.

A Hazardous Weather Outlook is also issued daily with information on possible hazardous weather through the next seven days. A watch is issued when conditions for severe weather or flooding become possible. A warning is then issued when life threatening conditions are imminent or occurring.

Tornadoes

Tornadoes can even strike in mountain areas. In 2008 on August 23rd, this rope tornado struck Park County near Eleven Mile Reservoir. Image courtesy Jerry Bivens.
Tornadoes can even strike in mountain areas. In 2008 on August 23rd, this rope tornado struck Park County near Eleven Mile Reservoir. Image courtesy Jerry Bivens.

The best way to protect yourself from tornadoes is to have a plan of action. The safest place to be if a tornado approaches is in a basement or safe room within a well-built structure, or in an underground storm shelter. If none of these options are available, move to a hallway or a small interior room on the lowest floor, usually this is a closet or bathroom. Get under a heavy piece of furniture or in a bath tub and cover yourself with blankets. Remember, the greatest risk of injury from tornadoes is from flying debris.

Modular homes and mobile homes, even those tied down, offer little protection from tornadoes. If a tornado approaches, leave those locations and seek safety in a nearby sturdy building or storm shelter.

If you are driving in open country and see a tornado, if time permits, the best thing to do is simply drive away from the tornado path. Do not take shelter beneath a highway overpass. Wind speeds may actually be higher in these areas and often become collection points for debris.

If you are caught outside and cannot seek shelter inside a sturdy structure, crawl into a culvert or lie down in a narrow ditch or ravine and cover your head. But remember that the worst place to be when a tornado threatens is outside in the midst of flying debris.

Lightning

Lightning usually kills and injures more people in Colorado than any other thunderstorm hazard. Lightning also causes many wildfires.

The best defense to protect yourself against a lightning strike is to plan ahead and avoid being caught where you might be vulnerable. Check weather forecasts prior to venturing out, especially if you are heading into the mountains. Plan outdoor activities early in the day before storms develop.

If thunderstorms threaten, seek shelter in a building or in an enclosed metal-roof vehicle, making sure all windows and doors are closed. Never seek shelter under an isolated tree. During thunderstorms, stay off corded telephones, away from electrical devices, and away from plumbing. Also get out of shower stalls, bath tubs, swimming pools and lakes when lightning is nearby.

You should wait at least 30 minutes after the last sound of thunder before resuming outdoor activities. When thunder roars…go indoors.

Floods and Flash Floods

The Big Thompson Flood in 1976 claimed the lives of 144 Coloradoans and serves to remind us of the dangers of floods. (USGS)
The Big Thompson Flood in 1976 claimed the lives of 144 Coloradoans and serves to remind us of the dangers of floods. (USGS)

When flooding or flash flooding is possible, you should remain alert and be ready to quickly evacuate to higher ground or climb to safety. Flash floods often occur suddenly and without warning. You need to follow some basic flood safety rules:

  • Do not camp or park your vehicle along streams and washes, particularly during threatening conditions.
  • If you are near a river, be aware of water levels and be prepared to move to higher ground if river levels rise.
  • Do not enter areas that are already flooded.
  • If walking or fishing along a river, be aware that erosion from swift running water can cause river banks to collapse.
  • Never let your children play around high water, storm drains, viaducts or arroyos.

At least half of all flash flood fatalities are vehicle related. While driving your automobile, look out for flooding at highway dips, bridges and low areas. Two feet of moving water will carry away most vehicles. Never attempt to drive across a flooded road. And be especially cautious at night when it is difficult to see flood dangers.

Strong Straight-Line Winds

Straight-line winds from thunderstorms, including microbursts, can become quite strong, even reaching speeds in excess of 100 mph in extreme cases. When thunderstorms approach, high winds can suddenly develop, causing things on the ground to become swift moving airborne missiles with a potential force to injure or kill. As with any thunderstorm, seek shelter before the storm arrives.

Hail

This is one of the largest recorded hail stones which is more than 7 inches in diameter and fell in Nebraska in 2003. (NOAA)
This is one of the largest recorded hail stones which is more than 7 inches in diameter and fell in Nebraska in 2003. (NOAA)

Large hail can pose a danger to animals and people. Hail also produces considerable damage to crops and personal property each year in Colorado. Again, get indoors before thunderstorms arrive. A fall of small hail can suddenly change to a fall of very large ice missiles which can injure or kill. Make efforts to protect personal property before storms threaten.

Warning Notification

When thunderstorms threaten, tune to NOAA All-Hazards Weather Radio, The Weather Channel, or your local radio or television stations. Also check the Internet web site from the National Weather Service office serving your area. And if you have a relatively new cell phone you should receive Tornado and Flash Flood Warnings on your phone if you are in the area of the warning.

During threatening weather days, plan the actions you will need to take so that you will be prepared if dangerous weather conditions actually develop.

NOAA’s National Weather Service wishes you a safe severe weather season.

Severe Weather Awareness Week in Colorado concludes today. During the past week we have presented information and safety rules for tornadoes, lightning and wildfires, floods and flash floods, straight-line thunderstorm winds, hail, and our warning programs.

 

Thornton gets pounded by nighttime storms bringing hail, wind and flooding rains

Lightning strikes east of 120th Avenue and Fairfax during Tuesday night's storms.
Lightning strikes east of 120th Avenue and Fairfax during Tuesday night's storms. View more images in the slideshow below. (ThorntonWeather.com)

For eight days in a row monsoonal flow fed thunderstorms have struck Thornton and Tuesday night brought arguably the best show yet.  Heavy rain, hail, gusty winds and an extraordinary amount of lightning roused residents soon after nightfall.

Storms initially formed in the afternoon and were focused south of Denver in Elbert County.  Near Kiowa, Elizabeth and Agate hail up to 1 3/4” in diameter was recorded.  The slow-moving storms deposited as much as five inches of rain near Agate.   Three twisters were reported in Elbert County but no damage was realized.

It appeared for a time that Thornton was going to escape the intense weather but once the sun went down the picture changed dramatically.  Seemingly out of nowhere a storm cell popped up at around 9:20pm and moved across the north Denver metro area.

Heavy rain fell across a large part of the area from downtown northward to Thornton.  1.76 inches of rain was recorded north of downtown Denver at DenverWX.com as the storm passed through.
Street flooding was reported across the surrounding areas causing difficulty for motorists.

Here in Thornton we were pounded with heavy rain and a great deal of pea-sized hail.  ThorntonWeather.com recorded its first inch of rain in only 14 minutes and the storm total for the overnight storm was 1.90 inches.

Strong winds also brought down trees and power lines knocking out power to nearly 10,000 Denver area residents including some in Thornton.  Xcel Energy reports power has been restored to most areas this morning.

Denver International Airport recorded a thunderstorm wind gust of 66mph shortly before 10:00pm.  A ground stop was issued and all flights were temporarily delayed while the storm moved through.
Forecasters had predicted a late and shorter than normal monsoon season due to La Niña’s lasting effect – that however has not proven to be true.

Monsoonal flow pulling in moisture from Mexico started earlier than normal this year.  Tuesday marked the eighth straight day for thunderstorms in the Denver metro area and the current weather forecast has at least a chance for storms through the weekend.

To date Thornton has recorded 4.22 inches of precipitation during the month of July.  This far exceeds the Denver historical average of 2.16 inches for July and with the month less than half over, chances are we could achieve ‘top 10 wettest’ status by the end of the month.

Wind may have contributed to deadly Adams County plane crash

The tail of the airplane is about all that was left after a deadly plane crash in Adams County. Yesterday’s thunderstorms brought powerful winds and lightning to the Colorado Front Range and may have been part of the reason for a plane crash in Adams County.  The small plane crashed in a field near Thornton killing its pilot.

The single-engine Cessna 182, owned by Jewel Aviation of Marshfield, Wisconsin, went down in a field near 124th Avenue and Quebec Street.  The pilot is believed to have been killed instantly when the plane exploded on impact.

The flight had just taken off from Front Range Airport approximately 20 miles away from the crash site.  Witnesses described seeing the plane struggling to stay airborne as it approached the field surrounded by residential homes.

Resident Catherine Von Axelson told 9News, “All of a sudden, this great big gust of wind hit.  His wing just completely flipped up and he nosedived into the ground and the plane exploded.”

Dry thunderstorms were moving through the area at the time of the crash.  Lightning from the storms sparked fires in the foothills and injured two National Guard airmen at Buckley Air Force Base.

The crash reportedly occurred at 3:25pm.  At that same time, ThorntonWeather.com reported gusts approaching 35 mph less than two miles from the crash site.  The owner of the station said that the actual gusts were likely much higher but measurements from the wind instrument are inhibited by nearby trees.

Microbursts, powerful straight line winds, often accompany Colorado’s thunderstorms and present a particular hazard to aviation.  Soon after the crash Denver International Airport halted takeoffs and landings and the facility reported a gust of 72mph.

Severe storms provide a bit of excitement, amazing views just east of Thornton

The bottom of a growing supercell thunderstorm near Denver International Airport. (ThorntonWeather.com)
The bottom of a growing supercell thunderstorm near Denver International Airport. (ThorntonWeather.com) View a slideshow of other images from the day below.

Yesterday’s forecast warned of the chance for severe storms and while Thornton escaped with just a few light rain showers, further to the east it was much more exciting.  As storms rolled off the foothills ThorntonWeather.com followed them east of DIA.

Many of the storms that formed yesterday were cut-off by mid-level winds that kept them from reaching their full potential.  One storm cell however reached full maturation eventually towering to an altitude of more than 25,000 feet.

The storm grew as it entered south-central Adams County south of Denver International Airport.  As it moved to the east side it exploded in height and soon had a classic anvil with an overshooting top.

While the storm was high-based and did not generate a tornado, it did eventually drop large hail in north-central Adams and southern Morgan counties.

Being the only real action in the area the storm drew a great deal of attention from area storm chasers, including ThorntonWeather.com.  At least a couple dozen chasers surrounded and followed the storm.  Below are some of the photos we took.

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Severe weather visits Thornton; calmer weather forecast

This storm cell over north Thornton on Sunday, August 15, 2010 was beautiful as it was lit by the setting sun.  See more images in the slideshow below.
This storm cell over north Thornton on Sunday, August 15, 2010 was beautiful as it was lit by the setting sun. See more images in the slideshow below.

Over the last two days, Thornton has seen its share of severe weather.  Thunderstorms on Sunday and Monday afternoons provided excitement but calmer weather is forecasted.

On Sunday, thunderstorms boomed over the northern part of town just as the sun was setting.  They provided a fantastic light show as the setting sun illuminated the thunder clouds in orange and lightning provided the flash.  These storms didn’t produce much within Thornton but further east they produced two tornadoes.

Monday the main event struck the northern half of the city.  Around 5:00pm dark, ominous clouds arrived with a green cast that warned severe weather was coming.  An astounding 0.53 inch of rain was recorded at ThorntonWeather.com in a mere 25 minutes as it dumped on the area.  Some minor street flooding was reported. 

The extended forecast calls for drier weather for the next few days.  Be sure to check our forecast for all the latest. 

Slideshow – Amazing images captured by Storm Chase 2010

A shelf cloud moves across Nebraska farmland. (Tony Hake / ThorntonWeather.com)
A shelf cloud moves across Nebraska farmland. (Tony Hake / ThorntonWeather.com)

Certainly the highlight of storm chasing is tornadoes and ThorntonWeather.com’s Storm Chase 2010 had plenty of those – five in one day in fact.  However, as great of satisfaction can be derived from simpler, less violent storms.  The images from a week of chasing on the Great Plains show the fury and the beauty of Mother Nature.

Storm chasing is as much an art as a science – there are no guarantees that tornadoes will appear as forecast. Other types of severe weather and the amazing structure they display can bu just as impressive.

Scud clouds hovering over a coal train in Nebraska, egg sized hail pummeling storm chaser vehicles, the sun setting on the Oklahoma plains and the now infamous Baca County, Colorado tornado ripping through ranchland all were highlights of Storm Chase 2010.

The images in the slideshow below represent some of the most stunning and beautiful images captured during the week.

Storm Chase 2010 wraps up – Chasers experience it all from sunsets to tornadoes

The Memorial Day tornado in Baca County, Colorado near Campo was the highlight of a week of storm chasing but it wasn’t the only exciting thing to happen. (Tony Hake / ThorntonWeather.com)
The Memorial Day tornado in Baca County, Colorado near Campo was the highlight of a week of storm chasing but it wasn’t the only exciting thing to happen. (Tony Hake / ThorntonWeather.com)

We have said before that storm chasing is as much an art as a science and it can very much be feast or famine.  Both extremes were seen over the course of a week of storm chasing on the Great Plains by ThorntonWeather.com.

We hope our site visitors were checking out the Storm Chase 2010 Examiner where we were documenting our chase across America’s heartland.  With stories, photos and video, the entire incredible week has been described in detail.

Two ‘busted’ storm chase days started out the week – one with a round trip from Denver to Nebraska and another one-way to Amarillo, Texas.  Those certainly fulfilled the ‘famine’ part of storm chasing. 

The third day however brought a ‘feast’ in the form of a bounty of five tornadoes in one day.  Chasing storms in southeastern Colorado, ThorntonWeather.com witnessed the entire gamut of severe weather from drenching rain and damaging hail to gale force winds and of course tornadoes. 

The first tornado of that day near Pritchett, Colorado allowed chasers to witness the complete tornado genesis.  As massive amounts of air were sucked into a storm cell and the clouds swirled menacingly above, a small funnel cloud soon grew into a powerful tornado. 

Two other tornadoes and an incredible hail storm on the virtually barren ranchland followed.  The main event was yet to come however. 

About eight miles south of Campo, Colorado, a massive supercell seemed poised to generate a tornado.  Chasers waited anxiously as the sky grew darker on the plains.  A funnel cloud formed and was cheered on as it grew closer to the ground. 

Before long the tornado was on the ground moving at a leisurely 10 mph – its slow pace allowing for plenty of time to capture amazing photos and video of the event.  The Baca County tornado would draw national media attention and will possibly go down as the most picturesque of all twisters during the 2010 tornado season.

While the Memorial Day tornadoes would be the last seen during the week, they were not the last extraordinary weather event witnessed by the storm chasers. 

Storm Chase 2010 intercepted a flying saucer over western Kansas at the end of a very long chase day. (Tony Hake / ThorntonWeather.com)
Storm Chase 2010 intercepted a flying saucer over western Kansas at the end of a very long chase day. (Tony Hake / ThorntonWeather.com)

Two days after the southeastern Colorado tornadoes, chasers witnessed an extraordinary ‘mothership’ supercell near Goodland, Kansas.  The sight of the ‘flying saucer’ slowly moving across the Kansas wheat fields was extraordinary.

Central Nebraska proved to be the backdrop for another day of weather beauty.  Waiting patiently at a small town gas station, multiple super cells moved across the area and chasers were on the move.  From highways to dirt roads, the chasers saw the storms generate amazing shelf clouds and funnel clouds.

In the end, the group of storm chasers covered over 2,500 miles across five states.  They witnessed many funnel clouds and amazing storm structures and of course five tornadoes, two of which were at close range.  For many it was truly a once in a lifetime experience that allowed them to see Mother Nature’s fury up close and personal.   

Complete stories, photos and video from Storm Chase 2010:

Monday weather quieter but a funnel cloud is spotted over Thornton

This funnel cloud, one of many across the metro area Sunday, was spotted over Highlands Ranch.  Image courtesy Tracee Hendershott.
This funnel cloud, one of many across the metro area Sunday, was spotted over Highlands Ranch. Image courtesy Tracee Hendershott.

Thus far the weather today has been much quieter than it was yesterday when thunderstorms brought severe weather to most of the metro area.  Southern Thornton has seen a good bit of rain but areas farther north have had very little. 

Earlier today, local law enforcement did report a funnel cloud over 104th and Colorado Blvd from a thunderstorm that was moving through the area.  Reported at 12:47pm, the funnel moved to the east at 15 mph and quickly disappated.  Unlike yesterday when many funnel clouds – and three tornadoes – were reported, this is the only such report thus far today. 

Do you have pictures of this weekend’s severe weather?  Send them to info@thorntonweather.com and we will show them on our site!

Saturday storms bring heavy rain, funnel cloud

This funnel cloud was over north central Aurora Saturday afternoon.  Photo was taken from the Bennett area.
This funnel cloud was over north central Aurora Saturday afternoon. Photo was taken from the Bennett area.

Saturday afternoon’s thunderstorms brought some pretty interesting weather to Denver and the Front Range.  Our wettest and cloudiest month seems to be intent on finishing out right on par with what we would expect this time of year. 

Thunderstorms and showers moved across the metro area in the late afternoon Saturday producing thunder, lightning and rain across much of the area.  Some stations on the Rocky Mountain Weather Network reported quite heavy rain, particularly those on the west side of town.  Some of the rain totals along the Front Range since yesterday:

In yesterday’s forecast we warned of the possibility of landspouts which are small, short-lived tornadoes.  None were observed however a funnel cloud was reported over north central Aurora about three miles south of DIA at 4:50pm.  The funnel lasted about two minutes and never touched down and did not cause any damage.

Colorado Severe Weather Awareness Week highlights weather dangers in the state

Last year's Windsor tornado highlighted just how dangerous weather in Colorado can be.  Are you and your family prepared?
Last year's Windsor tornado highlighted just how dangerous weather in Colorado can be. Are you and your family prepared?

As is customary, the governor has declared this week Severe Weather Awareness Week.  This is an opportunity for the public to get reacquanted with the dangers severe weather presents in Colorado. 

Tornadoes, lightning, hail, severe wind and flooding are very real hazards that Coloradoans face every year during severe weather season.  It is important that you know what to do to protect you and your family. 

In conjunction with the National Weather Service, Examiner.com will be publishing our Severe Weather 101 series.  Each day this week a weather hazard will be discussed in depth and we will outline protective measures you can take to keep yourself and your family safe.  Please be sure to check back every day to read these important message.

From the National Weather Service

Thunderstorm hazards around the corner…are you prepared?

Severe thunderstorm season will be soon upon us.  Do you know how to stay safe around tornadoes, flash floods, lightning, hail, and damaging winds?  This is the week to learn.  This week, April 19th to 25th, is Colorado severe weather awareness week.   This is the time to learn more about severe weather in Colorado, develop severe weather preparedness plans, and test vital communications.

Can we learn lessons from the past severe weather events?  Just last year on may 22nd an EF3 tornado raced north through Weld and Larimer counties resulting in one fatality.  Several injuries and destroyed or heavily damaged hundreds of homes.  Two years ago, on March 28, 2007 the town of Holly was heavily damaged by another EF3 tornado that resulted in two fatalities.  Twelve years ago on July 28, 1997 a devastating flash flood occurred in Fort Collins resulting in 5 fatalities and millions of dollars in damage.

Each year for the past 20 years there have been an average of 50 tornadoes in Colorado, 3 people killed by lightning and another 15 injured by lightning.  

The National Weather Service offices which cover Colorado will issue a series of public information statements during the week covering the following topics:

  • Monday…Watches and warnings
  • Tuesday… Tornadoes and tornado safety
  • Wednesday…Flash floods and flash flood safety
  • Thursday…Downburst wind and hail
  • Friday…Lightning and lightning safety
  • Saturday…A review of the week

A time to test your warning reception and communications systems is planned.  Each national weather service office serving Colorado will send test tornado warnings on Tuesday April 21 between the hours of 8 am MDT and 11 am MDT.  These test warnings will be sent to the emergency alert system, the internet, NOAA weather radio and law enforcement communications systems. 

Safety information, watches, warnings, forecasts, past weather and much more information is available at your local National Weather Service web sites:

     www.weather.gov/denver      NWS Denver web site
     www.weather.gov/pueblo      NWS Pueblo web site
     www.weather.gov/goodland    NWS Goodland web site
     www.weather.gov/gjt         NWS Grand Junction web site