Category Archives: Thornton Weather

January 2008 Weather Summary – Denver’s 7th Driest January Since 1872

January 2008 Weather SummaryDenver and Thornton wrapped on the first month of 2008 dry.  Official measurements at Stapleton and at ThorntonWeather.com recorded only 0.08 inch of precipitation making it the 7th driest January since recordkeeping began in 1872.  This was 0.43 inch below the 0.51 normal, so a pretty big drop.  Only two days had measurable precipitation in the form of snow at Stapleton while in Thornton we recorded four. 

Officially only 3.1 inches of snowfall was recorded near the former Stapleton International Airport and in Thornton we recorded a bit less at 2.8 inches.  This was 4.6 inches below normal for Denver.  Thornton’s seasonal snowfall stood at 26.4 inches at the end of the month (the official Denver measurement was 29.5 inches) which is below the official normal of 33.3 inches for this period. There were no precipitation records set or tied during the month.

In regards to temperature, the normal average for the month is 29.2 degrees which we finished slightly below at 27.9 (28.2 in Thornton).  Illustrating the wide range of temperatures we experience in Colorado, we had a high temperature of 66 degrees on the 27th and a low of -1.7 on the 22nd (Denver recorded 63 and -3 on those days).  All but one day of the month, the 4th, recorded low temperatures below freezing and five days had high temperatures that never got above freezing.  While the month was below normal, it was still warmer than what it was just one year ago in 2007 when the average was 22.8 degrees! 

Some other interesting statistics…  We did have sunshine 79% of the possible time so it was pretty sunny at least.  Wind is of course a fact of life on the plains and we did have 12 days with wind gusts registering over 25mph.  On the 25th of the month we registered the highest gust of the month at 38mph. 

For a day by day log, click here to view our climate log for January 2008.

Fast Moving Storm Dumps 1.5″ of Snow

Snow!Much to everyone’s surprise, what was forecast to be not much more than a dusting of snow turned into quite a bit more.  In Thornton from about 6:00pm to 7:00pm we saw 1.5″ fall very quickly with near blizzard conditions for that brief period.  Much of the Denver metro area saw more snow than that, primarily west of I-25 and south of I-70.  Not far from us Broomfield reported 3.4″ and Federal Heights 3″.

Why did this storm offer more than predicted?  Here is what 7News’ meterologists offer:

Computer models had shown little if any snow across Denver.  However, instability in the atmosphere provided enough juice for a convective-type snowfall.  Reports of thundersnow came from southwest Denver near Chatfield State Park as a result of the instability early Wednesday afternoon.

This type of snow is called CSI, Conditional Symmetric Instability. It is generated when enough instability exists in the atmosphere to give snow showers a thunderstorm-type development.  With help from upslope flow, these snow events can dump a lot of snow in a short period of time.  While these events don’t last more than a few hours in most cases, snowfall rates as high as 2 to 3 inches can amount to excessive accumulation.

For the foreseeable future we expect to stay pretty dry.  Our next chance for snow comes Monday and into Tuesday.  No predictions yet on amounts of snow as it is too far out and the models aren’t consistent yet.  Until then, temperatures should be pretty seasonable.

Latest Snowpack Reports Continue to Hold Promise

Snowpack above normalSnowpack reports as of this morning continue to hold great promise for Colorado.  All of the major basins are above average with the exception of the South Platte.  Another major snowstorm is hitting the mountains today and yet another is forecast for Wednesday.  We can only hope this pattern continues and NOAA’s forecasts of a dry first quarter don’t hold true.

It would however be nice if some of that moisture would move out onto the front range and into the Denver area and the plains.  There is a chance for a bit of snow in the metro area tomorrow and again on Wednesday although right now it doesn’t look like they will amount to much.

Colorado SNOTEL Snowpack Update Report
Based on Mountain Data from NRCS SNOTEL Sites
**Provisional data, subject to revision**
Data based on the first reading of the day (typically 00:00) for Sunday, January 27, 2008
Basin
Site Name
Elev
(ft)
Snow Water Equivalent Percent of
Current
(in)
Today’s
Average
(in)
Avg
Peak
(in)
Avg
Peak
Date
Today’s
Average
Avg
Peak
GUNNISON RIVER BASIN
Basin-wide percent of average 132 72
UPPER COLORADO RIVER BASIN
Basin-wide percent of average 114 61
SOUTH PLATTE RIVER BASIN
Basin-wide percent of average 93 49
LARAMIE AND NORTH PLATTE RIVER BASINS
Basin-wide percent of average 99 54
YAMPA AND WHITE RIVER BASINS
Basin-wide percent of average 99 56
ARKANSAS RIVER BASIN
Basin-wide percent of average 148 80
UPPER RIO GRANDE BASIN
Basin-wide percent of average 150 83
SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS
Basin-wide percent of average 141 78

Storm Chaser Convention Coming to Denver

Storm Chaser Convention Coming to DenverFebruary 15th -17th Denver will play host to the 10th Annual National Storm Chaser Convention.  The event will be held at the Raddison Hotel at I-225 and Parker Road (3200 South Parker Road).  Most notably, the keynote speakers will be Dr. Josh Wurman and Sean Casey who appeared in the recently aired Discovery Channel special, Storm Chasers.  This is a great opportunity for weather enthusiasts to share storm stories, learn more about severe weather and storm chasing, see new weather gadgetry and hear from some of the experts in weather related fields. 

To learn more, please visit the National Storm Chaser Convention website at:  http://chaserconvention.com

State Lucky Thus Far – Dry Months Ahead According to NOAA

Dry Months Ahead?Klaus Wolter, a meteorologist affiliated with the University of Colorado and the National Oceanic and Atmospheric Administration continues to promise a dry winter.  In an article today in the Rocky Mountain News he says, “I think we should count our blessings. We got lucky” in regards to the amount of moisture the state has seen thus far.

According to Wolter, the La Nina weather pattern present in the Pacific will persist resulting in storms tracking north of our state.  The good news though is that snowpack thus far is above normal statewide and even if their predictions bear out, we should be okay come summer.  Here are the latest readings as of today:

           S N O W  -  P R E C I P I T A T I O N    U P D A T E 
  
              Based on Mountain Data from NRCS SNOTEL Sites 
                    As of MONDAY: JANUARY 14 , 2008 
----------------------------------------------------------------------------- 
STATE                                                      PERCENT OF AVERAGE 
  RIVER BASIN                                     Number   Snow Water  Accum 
                                                 of Sites  Equivalent  Precip 
-----------------------------------------------------------------------------
COLORADO 
  GUNNISON RIVER BASIN ......................... 11 of 13     144       137 
  UPPER COLORADO RIVER BASIN ................... 27 of 29     119       124 
  SOUTH PLATTE RIVER BASIN ..................... 15 of 15     105       101 
  LARAMIE AND NORTH PLATTE RIVER BASINS ........ 13 of 13     101       109 
  YAMPA AND WHITE RIVER BASINS ................. 17 of 19     102       111 
  ARKANSAS RIVER BASIN .........................  5 of  9     141       124 
  UPPER RIO GRANDE BASIN .......................  9 of 13     158       144 
  SAN MIGUEL, DOLORES, ANIMAS 
     AND SAN JUAN RIVER BASINS ................. 14 of 16     153       135

We of course hope the forecasters are wrong just like they have been about the last two hurricane seasons

Please click here for the full Rocky Mountain News Article. 

Slow Weather But We’re Always Changing

The weather lately has been pretty uneventful with little to talk about.  That may change Tuesday night when a cold front is supposed to move through.  In the meantime though, there have been some changes and additions to our site.  If you haven’t seen them already, you may wish to check them out.

  • – We’ve added the National Weather Service forecast discussion to the forecast section.  This is where the NWS provides some more narrative behind their forecasts and gives a bit more of an in depth look at what we can expect.  Click here to check it out.
  • – Our “Live Conditions” animation page now has the ability to view our lightning data, including the maps.  When you are there, click the Lightning button to see it.
  • – Did you know we provide an email weather alert and report system?  These are handy little emails that provide forecasts, statistics and more.  Click here to learn more and sign up.
  • – We would like to welcome a new “sister station” aboard.  ArvadaWX.com provides much of the same information we do here but tailored to Arvada, Colorado residents.  Be sure to check them out and if you know anyone else that lives in that area, let them know as well. 
  • – Don’t forget about our other sister station, ReunionWeather.com, for those that live in northern Commerce City!

As always, should you have any suggestions or comments about our site, please let us know

The Snow Clears Out, the Cleanup Begins

Snow clears outRound 2 of the snowstorms has come and gone and left Thornton with around 5″ of the white stuff.  As a result, we have now moved into the #10 spot of the snowiest Decembers on record which works out well as it helps to make up for the dry season we have had prior to this.  It will be cold today with some nasty windchills but we should start to see some melting tomorrow and into next week. 

 Thornton announced yesterday that residential streets were going to be plowed and they have already been making the rounds – ThorntonWeather.com’s street was plowed at 8:30 last night.  From talking to other residents, the quality of the plowing seems to vary widely but no matter what, it is nice to have it done.  We commend the city for taking the initiative and getting this done.  It is not a cheap endeavour but it is a service that residents should appreciate. 

Storm Arrives – 4 – 8″ Expected

SnowIt started snowing this morning around 4:00am and the storm appears to be intensifying.  There is a Winter Storm Warning in effect until 11:00pm tonight so it will be with us all day.  Remember that a winter storm warning means hazardous winter weather conditions are imminent or highly likely. Significant snow accumulations are occurring or expected. Strong winds are also possible. This will make travel very hazardous or impossible.

Current indications are that we should receive between 4 and 8 inches of snow.  Needless to say the drive home for those working today will be a bit rough.  Please allow yourself extra time and take it slow.