Tag Archives: Severe Weather

ThorntonWeather.com sneak peek – Storm Chasers episode 4 preview

The probe trucks await an opportunity to deploy their instruments on Discovery Channel's Storm Chasers.
The probe trucks await an opportunity to deploy their instruments on Discovery Channel's Storm Chasers.

We continue to be granted sneak peeks of new episodes of the Discovery Channel’s Storm Chaser’s (Sunday’s @ 8:00pm MST).  Last week corn husks fell from the sky on the scout crew after a tornado had passed and Reed and the TornadoVideos.net team chased a twister in the dark. 

As the show chronicles the 2008 storm season, it is now getting into what was the most intense period of the summer.  This coming Sunday’s episode guide says:

NIGHTMARE ON DOW STREET – Nov. 9 at 10 p.m. ET/PT
Halfway into the season, TIV1 returns to action, and the whole team heads first toward Oklahoma and then into Arkansas. Monster hail storms batter the fleet, but the vehicles forge ahead as tornadoes start touching down all across this part of the Great Plains. Everyone gets to feast on the tornado bounty, but after dark, a twister chases the chasers in the streets of Stuttgart, Arkansas.

This week’s episode sneak peek –  The storm chasers race to outrun a devastating twister as it quickly catches up to the team’s TIV-1 vehicle in this clip from Storm Chasers.

Wild Western Weather 2008 announced

Wild Western Weather 2008 will be held on November 18th.
Wild Western Weather 2008 will be held on November 18th.

The channel 7 24 / 7 Weather Center has accounced an exciting event – Wild Western Weather 2008.  The event will be held at the Wild Life Experience in Parker on Tuesday, November 18th from 6:00pm to 10:00pm.  This looks to be a great event with a number of notable speakers.  

Some of the highlights include: 

  • Tim Samaras – Tornado Expert – featured in National Geographic Magazine, “Inside Tornadoes – The Latest Research: Twistex 2008” 
  • Tony Laubach – Storm Chaser – “The Windsor Tornado vs Douglas County Landspouts” 
  • Dr. Walt Lyons – Lightning Researcher – “Flash Facts – Red Sprites, Blue Jets and Other Rare Airities” 
  • Ethan Green – Director, Colorado Avalanche Information Center – “Avalanches and the Big Snow Winter of 2007-08” 
  • Dr. Thomas Schlatter – NOAA’s Earth System Research Lab and the University of Colorado – “The Pine Bark Beetle – A Canary for Climate Change?”
  • I do wish they had chosen a more central location for it or at least held the event on the weekend.  It is pretty tough for anyone who works and lives north to try to make it down there. 

    For more information, check it out on channel 7’s website here:  http://www.thedenverchannel.com/weather/5103957/detail.html

    Various weather notes – the streak ends, big rain and more

    Quite an eventful time we have had over the last 72 hours or so in terms of weather.  Some of the more noteworthy items:

    The streak ends.  With cooler air finally moving into Colorado, Tuesday, August 5th marked the last day of our streak of 90 degree or higher temperatures.  Wednesday the temperature reached 88 degrees at DIA thus breaking the heat wave and ending the streak at a record 24 days.  The previous record of 18 days was last set 107 years ago in 1901!  Click here to view the official statistics for the streak.  Here at ThorntonWeather.com, our streak wasn’t quite as long.  While the official streak dates back to July 12th, Thornton did have one day – July 17th – where the temperature “only” reached 88 degrees.  If we start counting for Thornton on the 18th, that would put the Thornton streak at 17 days.  But, let’s face it, “hot is hot” no matter how you look at it! 

    A racoon takes shelter in a storm drain at 120th & Colorado Blvd.  Image courtesy 9News.com.
    A racoon takes shelter in a storm drain at 120th & Colorado Blvd. Image courtesy 9News.com.

    Record seting rainstorm on Wednesday, August 6th.  As we discussed in our previous entry, severe weather moved across the Front Range bringing everything from thunder and lightning to funnel clouds and tornadoes to severe rain.  Various watches / warnings were issued including Tornado Warnings, Flash Flood Warnings / Watches and more.  Rain totals varied across the metro area with Thornton, particularly the northeast portions of the city, receiving the lion’s share.  At ThorntonWeather.com, we measured a whopping 2.43″.  The vast majority of that fell in a 70 minute time span from 6:00pm to 7:10pm.  Rain rates were reading between 3″ and 7″ per hour during that timeframe!  That is ThorntonWeather.com’s #1 rainiest day on record since going into service in October 2006; the previous record was 2.2″ set on April 24, 2007.  Some street flooding was reported in Thornton but thankfully little real damage.  At DIA they recorded 1.29″ of rain, breaking the old record for the date of 1.1″ set in 1929. 

    Cooler weather to prevail today.  Significant moisture in the atmosphere and cooler temperatures should keep the excitement level down today – at least compared to yesterday.  After noon there will be a chance for rain and those that do get rain can expect it to be heavy at times.  As long as the temperatures stay down, we shouldn’t have the severity that we experienced yesterday though.  Click here to view the latest forecast.

    Be safe, use your head, pay attention!  A bit of a report from the soapbox today.  As we were looking at pictures of the storm on various news sites, we came across one submitted to 9News from a Thornton resident of children playing in the street in the rain.  Now, that makes for a wonderfully fun picture and I am sure the kids had fun too but we do question how smart the parents were of these kids.  At the time Thornton was getting hit with the storm, lightning was popping across the entire area and there was a Tornado Warning issued as funnel clouds had been spotted.  Is outside playing in the street really where kids should be in a case like this?  That fun would come to a quick end if lightning struck or worse yet, one of those funnel clouds developed into a tornado.   Is that little bit of fun worth the risk of losing your child?  THINK ABOUT IT!  It may be worthwhile to review our Weather Education Series on Lightning and Tornadoes.

    Thunderstorm brings funnel clouds, severe rain

    An exciting evening in Thornton as far as the weather goes.  Just before 6:00pm Wednesday a slow-moving severe thunderstorm over north Thornton brought everything from funnel clouds to lightning to torrential rain. 

    The Thornton radar image when the storm was at its height. The storm dumped over 2" of rain in 1 hour.
    The Thornton radar image when the storm was at its height. The storm dumped over 2" of rain in 1 hour.
    Rain began falling in the area of 120th and Colorado Blvd at 6:00pm and over the next 70 minutes dumped 2.36″ of precipitation.  Lightning and thunder were predominant for the entire time as well.  At 6:40 the National Weather Service issued a Tornado Warning when several funnel clouds were spotted between south Thornton and Dacono.  These slow moving storms presented a clear and present danger but appear to have passed relatively uneventful.  Minor street flooding has been reported in some parts of Thornton but otherwise little damage.

    As of this writing, a Flood Advsiory and Flash Flood Watch remains in effect for much of the Denver metro area.  Radar does indicate the storm is deteriorating and things should beging to settle down now. 

    As always, please stay tuned to ThorntonWeather.com for the latest.  Be sure to monitor our Warnings and Advsiories page for realtime updates on current watches and warnings.

    Sentinel revisits 1981 Thornton tornado

    On June 3, 1981 a tornado struck Thornton in what is the worst twister to have struck the Denver metro area. Image courtesy the City of Thornton archives.

    I always tell the story of me being in 6th grade at Hillcrest Elementary in Northglenn on June 3, 1981.  Sitting at our desks the principal comes over the intercom and announces that all students need to get under their desks.  I look outside and see that it is dark as night – at least it seemed to be to a scared 12 year old! 

    Not long after, a tornado touched down a few miles away along Washington Street in Thornton destroying 25 homes and injuring 53 people. 

    In a recent series on the history of Washington Street, the Northglenn-Thornton Sentinel revisited that day and the damage the tornado caused.  It is fascinating reading whether you have lived here long enough to remember it or not. 

    Click here to read the article (3MB PDF). 

    Back from vacation and storms on the plains!

    The storm approaches!Your intrepid Weather Examiner is back from vacation, relaxed, tanned and ready for summer!  What makes a good vacation for a weather geek?  Severe storms of course and I saw a doosy while in northeastern Colorado last week. 

    Weatherwise my vacation started out pretty boring with mild days, cool nights and I suppose what most people would consider beautiful weather.  Last Friday started out much the same as the week with a calm, beautiful day on the eastern plains of Colorado but it is after all severe weather season and the chances of something brewing over a week are pretty good. 

    By the mid-afternoon, more clouds started to roll in and by late afternoon, I was watching a storm cell with great potential develop to the northwest of me.  Soon the weather radio was beeping warning of a Severe Thunderstorm Watch being issued for my location and that was upgraded to a Warning before too long. 

    Now we\'re talking!  Getting dark at 5:00 in the afternoon!Soon those clouds started to darken and spots of green were showing – sure signs of something major brewing.  A band of rain was clearly visible and moving our way.  A quick check of the weather radar software on my laptop showed great potential with the cloud tops exploding over 30,000 feet above.  Before long the rain started mixed with a touch of pea sized hail.  That rain got pretty heavy and the wind was getting pretty vicious.

    Even a junior weather forecaster can tell there is trouble on the radar!Being in an RV in severe weather is not always the wisest place but I was pretty confident we were okay although we did have a plan to escape to more secure shelter about 75 yards away. After dumping a good inch of rain in less than 20 minutes the storm passes. However, that same storm cell did spawn a tornado 10 miles to the southeast after it passed me. Even more notably, the cell was so powerful, it continued churning out severe weather for an additional 90+ miles before disappating!  
     
    After the storm - a beauful sunset on the plains.In the end, having the one day of severe weather while on vacation made it pretty danged fun!  The desire to chase the storm cell was strong but my better half would probably not have approved me leaving the family behind at that point.  🙂

    Windsor Tornado Officially Rated as EF3

    The National Weather Service has completed their tornado assessment of the Windsor tornado and determined the twister was rated an EF3 on the Enhanced Fujita scale.  See below for details and here for a map of the path the twister took

    PUBLIC INFORMATION STATEMENT…UPDATED…
    NATIONAL WEATHER SERVICE DENVER CO
    430 PM MDT FRI JUN 6 2008

    ..WELD COUNTY TORNADO OF MAY 22 2008 RATED AN EF3 TORNADO…

    On Thursday May 22 2008 a wide and powerful tornado swept north northwestward for 34 miles from northeast of platteville in Weld County at 1126 AM MDT to 7 miles east northeast of Fort Collins in Larimer County at 1216pm MDT.   The National Weather Service tornado damage assessments conducted on Friday May 23rd and Saturday May 24th documented large areas of damage.  On the enhanced Fujita scale there were pockets of EF3 damage especially near the Missile Silo Park Campground west of Greeley and to homes and businesses in eastern Windsor.  Wind estimates in the heavily damaged areas were as high as 130 to 150 mph. 

    The tornado was as wide as one mile at times along its path.  There was one fatality and 15 to 20 injuries.   Damage estimates are not finalized, but preliminary numbers from FEMA are 850 homes damage, with nearly 300 homes signficantly damged or destroyed.  Privately insured damages total 174 million dollars…and the Poudre Valley Rural Electric Association reported one million dollars of damage to electric transmission facilities.  

    One question frequently asked is how unusual was this event.  Certainly it was not unusual in time of year (May and June are the peak tornado months in Colorado).  It was not unusual in location (more tornadoes are reported in Weld County than any other county).  It was slightly earlier in the day than normal, as we usually see tornadoes in the mid afternoon to early evening.  The track was longer than most, the tornado was moving fastern than most,  and a track moving north northwest is very unsusual.  Since 1950 there have been a total of 20 tornadoes of f3 and higher within Colorado.  This was the second f3 tornado reported in weld county since 1950.   On May 15, 1952 an F3 tornado injured 5 people within the county. 

    For reference…the Enhanced Fujita Scale classifies tornadoes into the following categories:

    EF0…wind speeds 65 to 85 MPH.

    EF1…wind speeds 86 to 110 mph.  

    EF2…wind speeds 111 to 135 mph.

    EF3…wind speeds 136 to 165 mph. 

    EF4…wind speeds 166 to 200 mph. 

    EF5…wind speeds greater than 200 mph.