Category Archives: Thornton Weather

Upgraded – National Weather Service issues Winter Storm Warning as storm approaches

A Winter Storm Warning will go into effect Thursday morning.  Thornton may see 5 to 10 inches of snow out of the system.
A Winter Storm Warning will go into effect Thursday morning. Thornton may see 5 to 10 inches of snow out of the system.

The National Weather Service has upgraded what was a Winter Storm Watch to a warning and is now forecasting 5 to 10 inches of snow.  Everything seems to be aligning for Thornton and the rest of the Denver metro area to see its first winter storm of the season.

Most of the computers models are coming together with a solution that will pass a low pressure system across southern Colorado.  This solution sets things up for a significant winter weather event with accumulating snow across most of northeastern Colorado.

The Winter Storm Warning will go into effect at 9:00am Thursday and run through 6:00am Friday and is for snow and blowing snow.  Snow will gradually start Thursday morning in the pre-dawn hours and then increase in intensity before noon.  Throughout the day and into early morning Friday the snow will continue. 

Accumulations from 5 to 10 inches are possible with some isolated areas receiving more.  The snow will be joined with gusty winds to 35 mph and bitter Arctic cold temperatures that will send wind chill temperatures plumetting. 

Tomorrow morning’s commute may be a bit messy depending on the timing of the start of the snow.  The afternoon rush hour may be a doozy.  The one possible consolation will be that the snow is likely to of the relatively dry type that we see this year so shoveling shouldn’t be too bad. 

The cold that is accompanying this storm is the other notable aspect.  Thursday will see a high temperature around 23 degrees – nearly 30 degrees cooler than today.  Further that high temperature will be achieved around midnight.  After that the mercury will fall to around 16 degrees by 6:00pm with wind chills into the single digits.

Overnight lows Thursday night will be near zero.  Friday sees little in the way of improvement in terms of temperature with a forecast high of only 15 degrees.  As the clouds clear out late Friday that will allow for even colder nighttime temperatures Friday night with the mercury likely dipping to below zero.

As this storm hits conditions will likely become hazardous for travel and residents should be prepared.  For more information on what you can do to get ready and protect your family, be sure to check out the links below for our series on Winter Weather Preparedness. 

Intro Winter Weather Preparedness Week
Part 1 Winter travel safety
Part 2 Watches…warnings…and advisories
Part 3 High winds
Part 4 Wind chill temperatures and hypothermia
Part 5  Avalanche safety
Review  Winter Weather Preparedness Week review

NORAD’s Santa-cam captures St. Nick’s trip to Denver

Santa Claus flies over downtown Denver. Check out the video below to see highlights of his visit to Denver.
Santa Claus flies over downtown Denver. Check out the video below to see highlights of his visit to Denver.

As all the good little boys and girls rush to open their Christmas presents this morning most were asleep and missed Santa’s flight over Thornton and the Mile High City.  The good folks at NORAD in Colorado Springs however were able to capture video of St. Nick as he made his rounds.

Santa’s annual trip across the globe covers hundreds of thousands of miles.  From the North Pole to each of the seven continents and billions of presents delivered Santa Claus’ 2010 trip went off without a hitch. 

For 55 years the good men and women at the North American Aerospace Defense Command (NORAD) have tracked St. Nick on his annual journey and this year their cameras captured him as he visited Denver.  Check out the video below.  To see more pictures and videos of his trip check out our Santa Tracker page.

More than 45% of nation covered in snow while Thornton remains dry

United States snow cover map as of December 23, 2010.
United States snow cover map as of December 23, 2010. Click for larger image.

Last year a pre-holiday snowstorm covered Thornton in a blanket of white ensuring we had a white Christmas. This year the color will be brown for the Front Range but a sizeable chunk of the United States will have snow on the ground for the holiday.

From North Dakota to Minnesota and Iowa, a major winter storm dumped nearly two feet of snow on the upper Midwest two weeks ago.  The sheer weight of the snow was enough to collapse the Metrodome in Minnesota and send the Minnesota Vikings scrambling to find someplace to play football.

A new storm in recent days has brought flooding rains to California, Nevada, Arizona and Utah while the higher elevations in those states plus western Colorado see extraordinary snowfall.  Over a five day period many areas were finding that even a yard stick isn’t tall enough to record the snow that has fallen.

Thursday brings a slight chance for some precipitation but there will little if any accumulation from it.  Those in Denver wanting a white Colorado Christmas will need to head for the hills. Some of the extraordinary snowfall totals recorded over the last few days include:

GOTHIC                               82.0
CRESTED BUTTE 6.2 N                  77.5
COAL BANK PASS                       48.0
RED MOUNTAIN PASS                    44.5
MOLAS PASS                           41.0
SILVERTHRONE 10 E                    32.0
DILLON 9 E                           29.0
BRECKENRIDGE 2 W                     28.0
WALDEN 16.3 WSW                      23.5
COPPER MOUNTAIN                      23.0
STEAMBOAT SPRINGS 1 SE               20.2
WOLF CREEK PASS 1 E                  18.0
VAIL 2.6 E                           14.4

For more on the nation’s snow situation, check out the story on the Natural Disasters Examiner.

Santa prepares to depart the North Pole – Track him on ThorntonWeather.com

ThorntonWeather.com and NORAD offer the Santa TrackerSanta Claus begins his whirlwind trip around the globe tonight to deliver toys to all the good little boys and girls! For more than 50 years the North American Aerospace Defense Command (NORAD) has tracked Kris Kringle on Christmas Eve and helped to ensure he completes his journey safely.

ThorntonWeather.com is pleased to be able to provide live Santa tracking from NORAD right here on our site! 

Click here to check it out and be sure to come back often to see where Kris Kringle is at!

For a look back at his trip around the globe in 2009, check out the video below.

Denver’s white Christmas history – Not as common as one might think

Don't bet on a white Christmas in Thornton - the historical odds aren't very good.
Don't bet on a white Christmas in Thornton - the historical odds aren't very good.

As Christmas gets closer everyone always wonders if we are going to get the proverbial white Christmas. Unfortunately, if you look at Denver and Thornton weather history, the chances arent all that good but it also depends on what you define as a white Christmas.

December just isnt that snowy of a month, ranking as only the fourth snowiest (behind March, November and April) so historically we have a bit of a disadvantage.  There have however been some very white Christmases in our history and it is fun to look back.

For a complete look at Denver’s Christmas weather statistics, click here.

For the latest Thornton weather forecast for Christmas, check out our forecast page.  Be sure to follow us on Twitter and like us on Facebook to stay up to date with all the latest with Thornton’s weather.

Sunday brings brilliant sunrise and clouds to Thornton

A brilliant sunrise over south Thornton. View more images in the slideshow below. (ThorntonWeather.com)
A brilliant sunrise over south Thornton. View more images in the slideshow below. (ThorntonWeather.com)

A very chilly morning yielded a beautiful sunrise over south Thornton this morning.  ThorntonWeather.com was out for a walk and captured images of the brilliant red sky near the Spratt Lake facility. 

With mostly clear skies temperatures Sunday morning dipped clear down to 14.7 degrees – the coldest day we have seen this season.  Thankfully we will be warming up to above normal temperatures today as the forecast calls for a high of 54 degrees.

The images this morning not only include the spectacular sunrise but also lenticular and wave clouds.  

Lenticular clouds are one of the least common types and typically only occur at high altitudes near mountains with strong winds – both of which Colorado has in abundance.  These virtually stationary lens-shaped formations have been mistaken for UFO’s due to their rare appearance and unique saucer shapes. 

Also known by their scientific name of altocumulus standing lenticularis, these clouds are not entirely unusual in Colorado on the Front Range during the winter.  Strong jet winds force moist air to be pushed up by the rugged terrain of the adjacent Rocky Mountains.  This creates a wave-like pattern of air flow that condenses at high altitudes (usually around 20,000 feet). 

Below is a slideshow of some of the images we took this morning.

Thornton WinterFest forecast – Dry, cool and windy

The detailed forecast for Thornton's WinterFest.
The detailed forecast for Thornton's WinterFest.

A full day of events highlights Thornton’s annual WinterFest on Saturday and the weather should cooperate for the most part.  It will be a bit cool and windy but there is nothing weather-wise to keep everyone from coming out to this great event.

The outdoor activities start at 9:00 with a community walk around the multipurpose fields (108th & Colorado Blvd).  Temperatures will be right around the freezing mark at the start with northwest winds at 5 mph creating a wind chill of 28 degrees.  It will be chilly but certainly tolerable. 

WinterFest gets started in earnest at 10:00 with a full slate of events.  By then the mercury will have climbed to 35 degrees with light winds of 7 mph.  Skies overhead will be partly cloudy today but there should at least be intermittent sun to help warm things up. 

As the day progresses the thermometer will rise but the winds will also be picking up.  The high today will hit 41 degrees by about 1:00pm and hold steady there through 4:00pm when the sun starts to go down.  Winds will gradually increase through the morning peaking by 2:00pm at 15 to 20 mph, gusting to 25 mph.  After that they should start to die down and by 7:00pm they will be mostly calm.

Fireworks will close out today’s events at 8:30pm and the weather will be chilly but otherwise it should be a great display.  Temperatures by then will be down to 30 degrees but the winds will be calm. 

The City of Thornton has plenty of activities for the whole family today.  From the community walk to Santa’s village, ice skating, food and a concert from the Thornton Community Band.  Be sure to come out and join your Thornton neighbors!

You can get more details including a complete schedule of events on the city’s website.

Heading to Thornton’s WinterFest this evening? Expect cool temperatures, blustery conditions

Cool and slightly breezy for Santa's arrival in Thornton tonight. (ThorntonWeather.com)
Cool and slightly breezy for Santa's arrival in Thornton tonight. (ThorntonWeather.com)

Thornton’s annual WinterFest kicks off this evening at 6:30pm with the arrival of Santa and Mrs. Claus.  The weather will certainly not be a factor and Santa should be able to arrive without any problem and enjoy their time in our city.

Look for temperatures at the recreation center fields to be around 43 degrees when Santa arrives.  Temps will drop to around 39 degrees by the time tonight’s festivities end at 9:00pm. 

Winds are a bit gusty right now from 10 to 20 mph as a cold front moves through and unfortunately those won’t ease much.  Some higher gusts to 30 mph are possible so it will be a bit blustery. 

Snow is one thing that Santa won’t really find in Thornton this year.  A few flakes may fall this evening but no real accumulation is expected. 

Be sure to check back tomorrow for a complete look at Saturday’s weather for tomorrow’s events!

Lenticular clouds appear over Denver

These stacked lenticular clouds hovered over Denver on the evening of December 8th. View more photos in the slideshow by clicking on the image. Photo: Alycia Gilliland
These stacked lenticular clouds hovered over Denver on the evening of December 8th. View more photos in the slideshow by clicking on the image. Photo: Alycia Gilliland

Colorado is home to many weather phenomena which is certainly part of its appeal.  Our topography and geographic location allow us to experience a true four seasons and every type of weather. 

Yesterday if you turned your eyes skyward you were treated to an amazing display of lenticular clouds, an unusual formation but one for which Colorado is a prime viewing spot.

Storm chaser and meteorology student Alycia Gilliland has captured some stunning photos in recent months of the sky and yesterday’s display provided another opportunity.  As the sun began its decent late yesterday afternoon, Gilliland turned her camera skyward to capture beautiful images of “stacked” lenticulars. 

Click on the image to the right to view a slideshow of Gilliland’s photos.  You can learn more about lenticular clouds in our story on the Denver Weather Examiner.

Thornton’s November weather recap – Month ends drier and warmer than normal

November 2010 goes down in the books as drier and warmer than normal.  (iStockphoto / johnnyscriv)
November 2010 goes down in the books as drier and warmer than normal. (iStockphoto / johnnyscriv)

November 2010 was most notable not for what weather condition occurred but rather for what it lacked – snow.  Historically November is Denver’s second snowiest month but 2010 saw us receive very little of the white stuff as we start out the season far behind where we average.

At the official Denver weather monitoring station at Denver International Airport a mere 1.5 inches of the white stuff was recorded.  That is 9.2 inches below the historical November average of 10.7 inches.  Despite that, the month fell short of the top 10 least snowiest Novembers as number 10 on that list is 1971 with 1.4 inches.  Given that no snow was recorded in September or October, the 2010 snow season is off to a dismal start at more than 15 inches below normal.

In terms of precipitation, only 0.5 inch was collected in the rain bucket – barely more than half of the normal of 0.98 inch.  While dry, it wasn’t enough to put the month into top 10 driest November status.  Three years in Denver history have recorded only a trace of precipitation and the number 10 slot is held by 1989 when only 0.15 inch of precipitation was recorded.  No precipitation or snowfall records were set or tied during the month.

Here in Thornton we fared drier than the official Denver tallies on all fronts.  We recorded only 1.14 inches of snow and 0.33 inch of precipitation.

Temperature-wise Denver ended the month warmer than normal with an average temperature of 38.3 degrees.  This was 0.8 degrees above the normal of 37.5 degrees.  Temperatures ranged from a high of 77 degrees on the 6th down to a low of 4 degrees on the 25th.  There were 24 days with low temperatures below the freezing mark which is normal.  On only one day, the 29th, did we fail to hit a high temperature of at least freezing as the thermometer only climbed to 31 degrees that day.  No temperature records were set or tied during the month.

Overall Thornton’s average temperature for the month was cooler than Denver’s.  The average temperature was 36.8 degrees with the warmest day hitting 78.7 degrees and the lowest temperature being 9.0 degrees.

Wind is of course a fact of life on the plains and November 2010 did set a new peak wind gust for the month of 55 mph on the 16th.  This easily broke the old record of 49 mph set in 1990.

Click here to view the 2010 Thornton Climate Summary.

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
745 AM MST FRI DEC 3 2010

................................... 

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF NOVEMBER 2010... 

CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1872 TO 2010

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              80   11/08/2006
 LOW              -18   11/29/1877
HIGHEST            77   11/06        79      -2       77  11/05
LOWEST              4   11/25       -18      22       16  11/16
AVG. MAXIMUM     52.6              51.5     1.1     56.4
AVG. MINIMUM     24.0              23.5     0.5     28.8
MEAN             38.3              37.5     0.8     42.6
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX = .01         6               5.6     0.4        3
DAYS >= .10         2                MM      MM        3
DAYS >= .50         0                MM      MM        0
DAYS >= 1.00        0                MM      MM        0
GREATEST
 24 HR. TOTAL    0.15 11/16 TO 11/16         0.33 11/14 TO 11/15

SNOWFALL (INCHES)
RECORDS
 TOTAL           42.6  1946
TOTALS            1.5               10.7

DEGREE_DAYS
HEATING TOTAL     793               826     -33      664
 SINCE 7/1       1128              1408    -280     1479
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        870               696     174      533

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST                        10/07
LATEST                          05/05
................................................................. 

WIND (MPH)
AVERAGE WIND SPEED              9.7
RESULTANT WIND SPEED/DIRECTION   2/228
HIGHEST WIND SPEED/DIRECTION    45/310    DATE  11/16
HIGHEST GUST SPEED/DIRECTION    55/320    DATE  11/16

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

NUMBER OF DAYS FAIR            9
NUMBER OF DAYS PC             17
NUMBER OF DAYS CLOUDY          4

AVERAGE RH (PERCENT)     51

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       4
LIGHT SNOW                9     SLEET                      0
FOG                      13     FOG W/VIS