A powerful half-mile wide tornado ripped through South Dakota on Saturday, May 22, 2010. (NWS) Watch video of the twister and see a slideshow of the damage below.
A massive tornado reminiscent of a famous tornado in the state’s history ripped through central South Dakota on Saturday. The powerful twister appears to have been an EF3 tornado packing winds of over 160 mph and while damage to homes was recorded, miraculously no one was injured.
Supercell thunderstorms began forming on the South Dakota plains yesterday afternoon and began spawning tornadoes. The twisters were reported near the towns of Bowdle, Hosmer, Ipswich and Wetonka.
The National Weather Service’s Aberdeen, SD office reported that the largest of these appears to have done at least EF3 level damage, a level classified as “severe.” The twister tore through parts of Brown and McPherson Counties coming closes to the town of Bowdle.
The storm damage evaluation is ongoing but National Weather Service personnel said the tornado was at least one-half mile wide at its largest. No injuries were reported however three farms were damaged and numerous power lines were downed.
Images of the storm drew parallels to a tornado on June 24, 2003 that struck the town of Manchester, South Dakota. That twister, rated an F4, destroyed the town and to this day it has not been rebuilt. The photos of both events looked eerily similar.
ThorntonWeather.com now brings local, Thornton weather to your advanced mobile phone.
With the advent of new advanced mobile phones like the Droid and iPhone, users of these devices are able to view more complete content than ever before. No longer are they limited to totally stripped down versions of web pages. Recognizing the proliferation of these new devices, ThorntonWeather.com has completely revamped our mobile website to provide users of advanced mobile devices a more interactive, graphical experience.
On ThorntonWeather.com Mobile (http://m.thorntonweather.com) you will find a familiar looking ‘dashboard’ much like on our full site. It provides real-time Thornton weather conditions as well as an almanac with sunrise and sunset times, moon rise and moon set times, as well as the moon phases.
The forecast page has your complete local, Thornton forecast – not a forecast for DIA or downtown. Radar is of course available including a local, regional and national view. You can also view our weather webcams on the webcams page and graphs of today’s weather as well as days past.
Looking for some reading material? Our news and blog section now has a mobile version as well which you can access from the mobile pages. All of our recent news stories are available for viewing by mobile users.
You can access the mobile site by clicking the “Mobile” button on the top right of our main site or direct your phone’s mobile browser to http://m.thorntonweather.com. Be sure to bookmark it so you can come back to it easily.
May 23 to May 29 - This week in Denver weather history
We are getting closer to Colorado’s severe weather season and see how dangerous it can be when we look back in Denver weather history. Many occurrences of dangerous lightning, large hail, flooding and tornadoes have been the hallmark of this week in Denver weather history.
20-27
In 2002…lightning sparked a wildfire near Deckers. Extremely dry conditions and very strong winds the following day allowed the fire…known as the schoonover…to consume 3850 acres before it could be contained. Thirteen structures were destroyed…including 4 homes…resulting in 2.2 million dollars in damage.
21-23
In 1876…snow changed to heavy rain over the city…resulting in widespread flooding along Cherry Creek and the South Platte River…nearly as great as the flash flood of May 19-20…1864. However…damage was greater because the city had grown much larger and there were more bridges for the flood waters to destroy. Precipitation in the city totaled 6.70 inches from 10:00 pm on the 21st through 3:00 am on the 23rd. The greatest precipitation ever recorded in Denver in 24 hours…6.53 inches…occurred on the 21st and 22nd. Small buildings and bridges along Cherry Creek were washed away by the flood waters. Bridges over the South Platte River were damaged. The city irrigation ditch was damaged and rendered unfit for service. Strong winds at speeds of 30 to 40 mph drove the heavy rain through brick walls 12 to 16 inches thick. Many sheep and cattle were either killed by lightning or drowned…including some 100 head of cattle in Jefferson County alone. There was immense damage to railroad tracks…especially the Kansas Pacific line to the east of the city. The Colorado Central suffered estimated damage of 10 to 15 thousand dollars. In addition…the heavy rain caused extensive flooding on soda and bear creeks in the foothills. Flooding along Boulder creek inundated farm and pasture land in the Boulder valley and damaged a few bridges. Rail travel had to be suspended in the area for several days.
22-23
In 1933…high winds and gales overnight caused considerable damage in and near the city. Much greenhouse glass was broken…which caused damage to sheltered plants. Great numbers of plants growing in the open were damaged or killed by wind-driven sand and soil. Fields were eroded by the wind and a few trees were uprooted. West winds were sustained to 38 mph with gusts as high as 65 mph in downtown Denver on the 22nd.
23
In 1916…southeast winds were sustained to 43 mph with gusts as high as 52 mph. The winds were strong for several hours during the afternoon.
In 1965…thunderstorm outflow wind gusts to 59 mph were recorded at Stapleton International Airport.
In 1987…slow moving thunderstorms bombarded metro Denver. One inch diameter hail was reported in south central Denver. Torrential rain caused widespread street flooding… Stalling traffic throughout the area. Rainfall totaled 2.10 inches in just 25 minutes in extreme southeast Aurora. Many other locations in Aurora and east Denver reported 1 to 1 1/2 inches of rain in about 30 minutes. Thunderstorm rainfall totaled 1.33 inches at Stapleton International Airport where 1/4 inch diameter hail was measured and north winds gusted to 40 mph. A man was slightly injured by lightning near Stapleton International Airport. Lightning also started a fire that severely damaged a house in Aurora.
In 1990…a microburst wind gust to 52 mph at Stapleton International Airport produced some blowing dust.
In 1991…thunderstorms moving from southwestern sections of metro Denver to the east of Denver produced large hail up to golf ball size. An estimated 5 thousand homes and 8 thousand cars received considerable damage. Early estimates placed damage costs around 60 million dollars. Three funnel clouds were also reported…two by personnel at Buckley Field and the other by a storm spotter. Heavy rain produced street flooding in Aurora where hail accumulated to a depth of 6 inches. As the storms moved to the east…golf ball size hail was reported at Strasburg.
In 1997…hail to 3/4 inch diameter fell in Broomfield.
In 2002…a very strong microburst near Strasburg swept a woman into a swirl of dirt and carried her about 150 feet. The woman was in an open field…corralling a yearling horse… When the incident occurred. Fortunately…she received only minor injuries.
Dangerous driving and irresponsible behavior by some storm chasers has led to worries that someone will get killed while chasing storms soon. In this image from a video, the infamous Tornado Intercept Vehicle (TIV) is seen passing other vehicles in an unsafe manner. Watch the video at the link below. (YouTube / Steve Miller)
Professional and amateur storm chasers, television and movie crews, researchers and news media all converge on Tornado Alley during storm season. Severe weather is fascinating and it has been brought more and more into the public eye thanks to the Internet and popular television shows. That popularity has given rise to increased danger to everyone and many say it is only a matter of time before someone chasing a storm gets killed.
Over recent weeks, tornado outbreaks in Oklahoma have seen hundreds of chasers of all types converge on tornado producing storms. Some are there for fun, others to study the phenomena for science, a few to get their two minutes of fame by capturing video to be shown on the Weather Channel and some to capture ‘the perfect shot’ for a movie.
With so many people in a relatively small area chasing the same target, conflicts are sure to arise and they have. Traffic jams of chasers around the storms have created a safety hazard as vehicles are unable to move. People are exiting their vehicles, standing in the middle of roads, all to get a glimpse of a twister.
Many have put the blame for the problem on inexperienced chasers, lured to the chase by what they see on television and the Internet. To be sure these novices can cause problems however they are not the only ones by far.
Vortex 2, the largest tornado research project in history, has brought a veritable armada of vehicles to bear chasing storms. The group’s mission of trying to learn more about tornadoes is important and Dr. Josh Wurman, one of the scientists involved with the project, laments that chasers are getting in the way of science.
Waterworld hero? A device funded by Academy Award winning director and actor Kevin Costner will be deployed to help with the Gulf oil spill. (Universal Pictures)
As the Deepwater Horizons oil spill continues to grow virtually unabated, officials have turned to an unlikely source for help. Actor Kevin Costner offered the use of his “Oceans Therapy” device to help with the cleanup of the expanding environmental disaster and BP willingly accepted.
In the wake of the Exxon Valdez accident in Alaska, Costner believed there had to be a way to speed the cleanup and recovery. Since then, he has invested $24 million of own money to fund the Oceans Therapy Solutions, the firm that has worked to develop the machine. Costner’s brother is a lead researcher on the project.
Using centrifugal force, the manufacturer claims the machines can remove 97 percent of the oil from the water. A single machine is reportedly capable of cleaning up to 210,000 gallons of water per day and the company is prepared to donate their use to help with the Gulf of Mexico cleanup.
In a demonstration in Louisiana (video at the link blow), the devices appeared to work as claimed, sucking in dirty water and dispensing virtually clear water.
What is the best way to get information about severe weather? A weather radio. (File photo)
No matter whether it is a blizzard in the winter or tornadoes and hail in the summer, it is important that everyone knows where to turn for information about developing weather conditions. Keeping an eye on the sky is fine but oftentimes there is dangerous weather brewing that you may not see.
How dangerous is the weather? Consider this: In 2008, 566 people across the United States were killed by weather-related causes and 2,899 were injured – and that was a below average year. Of those, 12 were Coloradoans that were killed with 100 Coloradoans injured. Over $29 billion was paid out in property and crop losses across the nation, $166 million in Colorado alone.
The danger is real and with the severe weather we have seen recently, residents are wondering how best to keep themselves and their families safe. Tuning in the TV or radio or checking your favorite weather website is one way but what if you aren’t near your computer or don’t have your TV on? What if severe weather strikes in the middle of the night?
It is important to note that there is only one official source for weather related alerts and warnings – the National Weather Service (NWS). All watches, warnings and alerts you see and hear about originate with the NWS and by far the best way to be proactively warned of severe weather is what is commonly referred to as a “weather radio.”
NOAA Weather Radio All Hazards (NWR) is a nationwide network of radio stations broadcasting continuous weather information directly from the nearest National Weather Service office. NWR broadcasts official Weather Service warnings, watches, forecasts and other hazard information 24 hours a day, 7 days a week. When a weather watch or warning is issued, it is immediately broadcast on NWR. The system is also used to broadcast information about other civil and weather hazard information like earthquakes, avalanches, chemical spills, terrorist attacks and even AMBER alerts.
This weather radio from Midland (model WR-300) includes SAME area encoding and an AM / FM radio.
It is highly recommended that any weather radio purchased include the SAME feature – Specific Area Message Encoding. Using the SAME feature, users can program a code into the radio for the area in which they live and the radio can then be set to automatically turn on and sound an alert when a weather watch or warning is issued for their area. Users of weather radios with SAME coding can be assured they will be immediately notified in an emergency.
Price and features of weather radios can vary but a good one with the SAME feature can be found for about $30.00. More expensive models may add clock, AM/FM radio and even weather forecasts retrieved from the Internet. There are portable handheld models as well that you can take with you wherever you go.
Finding a weather radio locally may be difficult as there aren’t many stores that carry them. Some Denver area King Soopers and Radio Shack stores have had them so you may call your local store to check. Alternatively, there are many good, trustworthy sites online where they can be purchased including Amazon.com, New Egg and Ambient Weather.
Weather radios provide essential information when severe weather is ready to strike. With a small investment, these units are an essential tool to protecting you and your family.
Do you have questions about weather radios? Post them in the comments section below and ThorntonWeather.com will answer them.
According to data released by the National Oceanic and Atmospheric Administration (NOAA), the combined land and sea temperatures for last month were the warmest April temperatures on record. Individually, sea surface temperatures were the warmest for any April and surface temperatures were the third warmest.
Utilizing data from the National Climatic Data Center (NCDC), the agency reported that the combined temperature of 58.1°F (14.5°C) was 1.37°F (0.76°C) above the 20th century average of 56.7°F (13.7°C).
For the period from January to April, temperatures also were the warmest first quarter on record. NOAA said the combined temperature over the period was 56.0°F (13.3°C). That is 1.24°F (0.69°C) above the 20th century average.
In the United States, NOAA said that April featured above normal temperatures and below normal precipitation. Much of the eastern half of the nation experienced warmer than normal temperatures resulting in measurements 2.3°F above average and going down in the books as the 14th warmest April on record.
A Tornado Watch is in effect for eastern Colorado through 9:00pm Tuesday night. (NWS)
Update, 7:10pm – Most of the ‘action’ has shifted north of the metro area into Weld County. Multiple tornadoes have been spotted. Residents of Greely, Lockbuie, Fort Morgan and surrounding areas need to be aware of these severe weather conditions.
For the metro area, things have settled down a bit. However, a Tornado Watch remains in effect until 9:00pm. There remains a chance of an isolated thunderstorm moving off the foothills with severe wind, rain, hail and possibly tornadoes.
Have pictures of the severe weather? Email them to info@thorntonweather.com and we will post them!
Update, 5:05pm – The Severe Thunderstorm Warning that covered parts of the metro area has expired. However, a Tornado Watch remains in effect until 9:00pm for all of eastern Colorado including Denver.
Thus far the Front Range has been spared any tornadoes but there has been activity elsewhere in the state. One tornado was reported two miles east of Rockport in Weld County and another one mile east of the rest area near the Wyoming border, also in Weld County. No damage has been reported.
Update, 4:10pm – The National Weather Service has issued a Severe Thunderstorm Warning for western Adams, northeastern Denver and south central Weld County. Radar indicates a severe thunderstorm that could produce one inch diameter hail over northern Denver and moving north at 25 mph.
Areas under this warning include Lochbuie, Brighton, Denver International Airport, northeastern Denver, eastern Thornton, Commerce City and northwestern Aurora. The warning will remain in effect until 4:45pm.
If severe weather approaches your area, go inside to sturdy shelter and stay away form flood-prone areas. Remember that a severe thunderstorm can produce damaging hail, winds in excess of 58 mph, deadly lightning and heavy rain.
The Tornado Watch that covers all of eastern Colorado continues until 9:00pm.
Original story, 1:20pm: The stage is set for the first significant severe weather threat of the season to the Mile High City. Thunderstorms have quickly built as they moved off the foothills south of Denver and they are expected to increase in intensity as the afternoon progresses.
The National Weather Service has issued a Tornado Watch for all of eastern Colorado through 9:00pm tonight. This includes the Denver metro area and the entire Front Range.
Remember that a Tornado Watch means that conditions are favorable for tornadoes and severe thunderstorms. Residents in the areas under the watch should take appropriate precautions and stay tuned to media outlets for updates to the rapidly worsening conditions.
The biggest threat from these storms will be hail, damaging wind, dangerous lightning and tornadoes. The main area of focus for the worst of this is going to be over the Palmer Divide and areas east. However, it is entirely possible that more widespread severe weather will occur, including over the main part of the Denver area.
We will be updating this page throughout the afternoon and evening as long as the severe weather threat remains.
30 years ago today, Mount St Helens erupted in what would become the most expensive and deadliest volcanic event in the history of the United States. (USGS)
The morning of May 18, 1980 started as a quiet one with bright blue skies over the Cascade Mountains in Washington. That however quickly changed at 8:32am when Mount St. Helens came to life erupting in what would become the deadliest volcanic event in the history of the United States.
The eruption wasn’t entirely a surprise – volcanologists and geologists had been closely monitoring the mountain in the weeks leading up to the eruption. A magnitude 4.2 earthquake on March 20th provided a clue of what was to come. Over the next two months, the side of the mountain began to bulge until May 18th when a magnitude 5.1 temblor triggered a landslide that led to the eruption.
In an instant, the side of Mount St. Helens exploded with a ferocity that had not been seen in United States history before. The result was astounding – and devastating.
The eruption sent ash 80,000 feet into the atmosphere depositing ash across 11 states. In neighboring Yakima, 5 inches of ash fell and areas as far east as Spokane were blanketed in darkness from the cloud. The ash took less than two hours to reach Yellowstone National Park and a day to reach Denver, Colorado.
230 square miles around the mountain was obliterated – all vegetation and manmade structures were destroyed within the area. 250 homes were leveled and 47 bridges and 185 miles of highway were destroyed. What was Washington’s fifth largest mountain was reduced from 9,677 ft tall to a height of 8,365 ft.
The human toll was equally devastating as 57 people died as a result of the eruption.
Arguably the first to lose their life was volcanologist Dave Johnston who was stationed near Coldwater Ridge. Johnston radioed, “Vancouver! Vancouver! This is it!” and was never heard from again.
Perhaps more famous was Harry Randall Truman who lived on the mountain and was the owner of the Mount St. Helens Lodge at Spirit Lake. Leading up to the eruption, the 83-year-old Truman refused to evacuate believing the claims of an impending eruption were exaggerated. He would pay for his decision not to leave with his life.
The mountain would continue to remain very active for the next five months producing five more explosive eruptions. Since that time, the volcano has built a new lava dome and periodically releases steam and ash as the unrest beneath continues to this day.
The area continues its recovery, allowed to do so on its own. In 1982, President Ronald Reagan established Mount St. Helens National Volcanic Monument setting the area aside for research and recreation.
May 16 to May 22 - This week in Denver weather history
Late spring typically brings some of the most eventful weather Denver sees throughout the year and our look back at this week in Denver weather history shows that. There are many typical events we would expect to see such as hail, heavy rain and flooding, and even tornadoes. Most notably, this week marks the two year anniversary of the Windsor tornado. And, for those that think the snow is done, we can see that in 1983 a snowstorm struck the city forcing the closure of Stapleton International Airport.
14-18
In 1996…a period of unusually warm weather resulted in 4 record maximum temperatures in 5 days. The record high temperatures were 87 degrees on the 14th…89 degrees on the 15th…and 93 degrees on both the 16th and 18th. The temperature climbed to only 81 degrees on the 17th which was not a record.
15-16
In 1957…heavy snowfall totaled 8.8 inches at Stapleton Airport. The greatest amount on the ground was 3 inches.
In 1986…a spring storm dumped 1 to 2 inches of rain over metro Denver…but 2.71 inches fell at Buckley Field in Aurora. Rainfall only totaled 0.84 inch at Stapleton International Airport. Snow fell in the foothills with 7 inches recorded in Coal Creek Canyon southwest of Boulder.
16
In 1875…a heavy hail storm turned into heavy rain during the afternoon. Rainfall totaled 0.86 inch in just 37 minutes…while the temperature dropped 22 degrees in 22 minutes. Precipitation totaled 0.90 inch.
In 1894…west winds were sustained to 48 mph with gusts to 56 mph.
In 1949…a tornado was observed for 16 minutes…20 miles to the southeast of Stapleton Airport. The tornado moved 5 miles to the northeast before dissipating. No damage was reported.
In 1963…intense lightning started several forest fires in the foothills southwest of Denver near Deckers and Cheeseman Lake. Little precipitation fell from the storms to alleviate the unusual dry conditions so early in the season.
In 1978…thunderstorm winds caused damage in southeast Aurora. Winds of 60 to 80 mph blew down numerous fences and damaged several homes under construction. High winds tore docks loose at Cheery Creek Reservoir…sinking 3 or 4 boats and damaging about 15 others. At Stapleton International Airport where winds gusted to 60 mph…a 727 jet suffered 15 hundred dollars damage when wind toppled a runway light onto it. The public reported an unconfirmed tornado 7 miles south-southwest of Stapleton International Airport.
In 1990…a line of thunderstorms moving across metro Denver uprooted a large ash tree…which fell and blocked the outside doors to a Denver elementary school…briefly trapping the students inside. Thunderstorm wind gusts to 69 mph were reported at Jefferson County Airport. Northwest winds gusted to 44 mph at Stapleton International Airport.
In 1991…two tornadoes touched down briefly in Castle Rock… But no injuries or damage were recorded. Heavy thunderstorm rains of 0.50 to 1.10 inches in a couple of hours caused Lena Gulch near Golden to flood. No damage was reported.
In 1996…dry microburst winds of unknown strength overturned a trailer and damaged storage sheds in Strasburg east of Denver.
.jpg "A powerful half-mile wide tornado ripped through South Dakota on Saturday, May 22, 2010. (NWS) Watch video of the twister and see a slideshow of the damage below.")
The human toll was equally devastating as 57 people died as a result of the eruption.