Updated NOAA outlook for winter indicates chance for increased precipitation for northern Colorado

The National Oceanic and Atmospheric Administration’s Climate Prediction Center (CPC) released updated outlooks for winter 2011 – 2012 indicating it could be a snowy one for the northern half of Colorado.

The original outlooks from the agency released previously offered a drier picture, primarily based on the influences of La Niña in the Pacific.  Given however that the current event is relatively mild, its effects are limited, particularly this far inland.

For the meteorological winter from December 2011 to February 2012, NOAA places virtually all of Colorado in an area that has equal chance of well above, well below, or near-normal temperatures.  However, the northern half of the state, including Denver, is given a 33% chance of experiencing above normal precipitation.

NOAA said:

The winter outlook for this winter favors above average temperatures across much of the South, from New Mexico across the Southeast to the Atlantic coast… and also favors below average temperatures across much of the Northern plain, the Northern Rockies, the Pacific Northwest, and a good part of the West as well as the southern half of Alaska.

With regards to precipitation, we see those areas most likely to experience below-average precipitation across the South– in particular Florida and Texas– with a better than even chance of being wetter than average across much of the North– particularly from the Ohio valley and the Northern Rockies and the Pacific Northwest.

Last year, Denver experienced second least snowiest snow season on record as the city only recorded 22.8 inches (21.2 inches in Thornton).  This season the picture is much improved with 22.2 inches having been recorded so far – nearly as much as all of last season.

NOAA's updated Winter 2011 - 2012 outlook. Click the image for a larger view. (NOAA)
NOAA's updated Winter 2011 - 2012 outlook. Click the image for a larger view. (NOAA)

On the net:

December 11 to December 17 – This Week in Denver Weather History

December 11 to December 17 - This Week in Denver Weather History
December 11 to December 17 - This Week in Denver Weather History

This time of year snow is a common occurrence but in our look back at this week in Denver weather history we are struck by the lack of significant snow events in the history books for the period. What we do see instead are a number of high wind events, many of which caused widespread damage.

From the National Weather Service:

2-17

In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record. Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th. Daytime highs were balmy with 14 days in the 60’s and 70’s. Low temperatures dipped to freezing or below on only 5 days. The period was dry with only a trace of snow on the 12th.

3-15

In 1972…a protracted cold spell held an icy grip on metro Denver when maximum temperatures never reached above freezing for 10 consecutive days from the 3rd through the 12th and minimum temperatures dipped below zero on eleven consecutive days from the 5th through the 15th. Daily low temperature records were set with 15 degrees below zero on the 5th…17 degrees below zero on the 6th… And 18 degrees below zero on the 10th. Daily record low maximum readings were set with 3 degrees on the 6th and 6 degrees on the 9th. The very cold temperatures were caused by 3 to 5 inches of snow cover and a Canadian air mass.

8-12

In 1932…the second longest sub-zero period on record in Denver occurred. The temperature fell below zero shortly after 1:00 pm on the 8th and remained below zero for 92 hours until 9:00 am on the 12th. The lowest temperature recorded during this period was 13 degrees below zero on both the 9th and 11th. That temperature on the 11th was a record low for the date. High temperatures of 4 on the 8th…5 below zero on the 9th…1 below zero on the 10th… And 6 below zero on the 11th were record low maximum temperatures for those dates. Light north winds at 5 to 10 mph were accompanied by occasional light snow…which totaled only 2.2 inches.

9-13

In 1961…cold arctic air produced a protracted cold period. The temperature plunged to 16 degrees below zero on the 10th…establishing a new record for the date and the coldest reading since 25 degrees below zero on February 1… 1951. Low temperatures dipped below zero on 5 consecutive days with 9 degrees below zero on the 9th…16 below on the 10th…10 below on the 11th…and 12 below on both the 12th and 13th. High temperatures reached only 3 degrees on the 10th and 6 degrees on the 11th.

10-11

In 1933…downslope winds produced warm temperatures…resulting in record high minimums of 46 degrees on the 10th and 44 degrees on the 11th. High temperatures of 66 degrees on the 10th and 62 degrees on the 11th were not records. Southwest winds were sustained to 16 mph on the 10th.

In 1939…high temperatures of 70 degrees on the 10th and 74 degrees on the 11th were record maximums for the dates. The low temperatures of 39 degrees on the 10th and 41 degrees on the 11th were not records.

In 1948…high winds in Boulder and Louisville caused 1750 dollars in damage. Wind gusts in excess of 70 mph were reported at Valmont and Boulder airport. Chinook wind gusts to 60 mph briefly reduced the visibility to 1/4 mile in blowing dust at Stapleton Airport.

In 1989…the season’s greatest snowfall to date hit metro Denver with 6 to 12 inches of snow. Flight delays at Stapleton International Airport reached 2 hours. Multiple wrecks snarled traffic on I-25 both north and south of the city. Snowfall totaled 7.0 inches at Stapleton International Airport where north winds gusted to 25 mph on the 10th.

Continue reading December 11 to December 17 – This Week in Denver Weather History

City of Thornton’s WinterFest to enjoy great weather for the festivities

One of many ice sculptures on display at WinterFest.  View more images from the first night of the festival below. (ThorntonWeather.com)
One of many ice sculptures on display at WinterFest. View more images from the first night of the festival below. (ThorntonWeather.com)

The City of Thornton’s annual winter festival is in full swing and after a chilly start Friday, the weather for the rest of the events looks to be much milder.

Santa Claus arrives safely last night and as always, the city has a full slate of events surrounding WinterFest at the Multipurpose Fields at 108th Ave and Colorado Blvd.  Residents can ice skate all day long and into the night, the ice carving demonstration is underway and of course Santa’s Village is open.

Tonight the Thornton Community Band will take to the stage at 7:00pm showcasing our community’s musical talent.  After the concert, Thornton will put on a fireworks show at 8:30pm, one of the few in Colorado during the winter and always the best.

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Sunday features the wide variety of fun in Santa’s Village. Tomorrow night the Thornton Community Chorus will raise their voices in celebration of the season.

For the weather, today we’re heading for a high of 45 degrees with just a light wind.  It will dip to right around the freezing mark by 7:00pm when the band concert takes place and then down to 28 degrees for the fireworks at 8:30pm.

Tomorrow will be even warmer with plenty of sun above as we head for a high of 48 degrees with light winds.  When the chorus takes to the stage at 6:30 it will be around 32 degrees.

Check out some of the photos we took of WinterFest last night below – then head on down and join the fun!

Thornton gets front row view of the last lunar eclipse until 2014

The lunar eclipse gets started in Colorado as the Earth's shadow starts to cover the moon.  View more images in the slideshow below. (ThorntonWeather.com)
The lunar eclipse gets started in Colorado as the Earth's shadow starts to cover the moon. View more images in the slideshow below. (ThorntonWeather.com)

It was a very cold morning in Thornton as the temperature dropped to 15° but the fog that was forecast never materialized and we had a great view of the lunar eclipse.  Just before dawn the Earth’s shadow began to encroach on the moon and just as the eclipse was peaking, the moon set behind the Rocky Mountains.

  • View images of the lunar eclipse as seen from Barr Lake State Park below

Fog in Denver was feared to be a threat for viewing this morning’s total lunar eclipse but Mother Nature cooperated and provided clear Colorado skies.  Not long before dawn the celestial show began and those who were able to witness it saw something that we won’t have an opportunity to see again until 2014.

NASA had called the lunar eclipse a ‘super-sized’ event due to its low placement on the horizon which tricks the mind and eye to thinking the moon is larger than it normally is.  With our only natural satellite setting in the west, Coloradoans were able to view the eclipse just as the moon set behind the Rocky Mountains.

The total lunar eclipse was visible across a large swath of the Earth.  From east of the Rocky Mountains to Australia and to Asia, nearly half of the globe had a view of the event.

Heightening interest in the eclipse was the fact that it will be the last total lunar eclipse for nearly three years.  The next one won’t occur until April 14, 2014.  There will be a second one that year on October 8th.   In 2015 there will also be two; one on April 4th and another on September 27th.

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Early risers Saturday to be treated to ‘super-sized’ total lunar eclipse

The last lunar eclipse until 2014 will be visible along the Colorado Front Range early Saturday morning.
The last lunar eclipse until 2014 will be visible along the Colorado Front Range early Saturday morning. (ThorntonWeather.com)

If you can get yourself out of bed early in the morning on Saturday, December 10, 2011 you will be treated to the last total lunar eclipse for nearly three years.  For viewers in Thornton and along the Colorado Front Range, the event will be relatively quick but punctuated by a setting moon with the Rocky Mountains in the foreground.

Saturday morning the moon will be passing through the lower half of the Earth’s shadow just before it sets in the west at 7:12am MST Saturday.  The low hanging moon will appear much larger than normal bringing what NASA calls a ‘super-sized’ eclipse.

Because the moon will be low on the western horizon, finding a good spot to watch it will be critical.  In Thornton, visitors to our Facebook page have suggested near the Thornton Civic Center, Brittany Hill or near the water towers at 112th Ave and I-25.  Some higher locations along Colorado Blvd north of 136th Ave might be good places as well.

The December 10th eclipse will begin around 5:46am MST as the first part of Earth’s shadow encroaches on the moon.  Totality will be achieved at 7:06am MST.

For watchers along the Colorado Front Range, the low moon with the Rocky Mountains to the west will render some extraordinary images.  There is however a catch.

The tall mountains on our western horizon are going to limit the time we are able to see the moon and the eclipse.  In the Denver area, we won’t actually be able to see the total eclipse as the moon will have disappeared behind the mountains by then.

It is estimated metro area residents will be able to watch the show until about 6:50am at which point the moon will be below the horizon.  Clear skies are in the forecast so clouds should not be a concern.

NASA says that astronomers and psychologists don’t know why the human brain sees the moon as larger when it is low on the horizon.  “In fact, a low Moon is no wider than any other Moon (cameras prove it) but the human brain insists otherwise. To observers in the western USA, therefore, the eclipse will appear super-sized,” NASA said.

The celestial show should be worth getting out of bed a bit early to see, even if residents of Colorado won’t get to see the entire show.

Atmospheric scientist Richard Keen of the University of Colorado told NASA, “I expect this eclipse to be bright orange, or even copper-colored, with a possible hint of turquoise at the edge.”

Keen explains that the Earth’s stratosphere is currently relatively free of volcanic dust and other particulates.  This should allow for a very bright event.

Tomorrow’s eclipse will be the last total lunar eclipse until April 14, 2014. A second will occur that year on October 8th.  In 2015 there will also be two; one on April 4th and another on September 27th.

If you get any pictures of the eclipse, be sure to head over to our Facebook page and share them or email them to us at info@thorntonweather.com and we will post them.

December 4 to December 10 – This Week in Denver Weather History

December 4 to December 10 - This Week in Denver Weather History
December 4 to December 10 - This Week in Denver Weather History

As we have seen in recent days, Old Man Winter oftentimes makes his appearance in earnest during the month of Denver. Looking back at this week in Denver weather history we can see that is not at all unusual.

From the National Weather Service:

1-5

In 1913…the 1st marked the start of the heaviest 5-day total snowfall in the city’s history. During this period snowfall totaled 45.7 inches. Starting on the 1st…snow fell intermittently for 3 days and accumulated a little over 8 inches. On the 4th and 5th…an additional 37.4 inches of snow fell. At Georgetown in the foothills west of Denver even more snow fell…86 inches over the 5 days with the most…63 inches…on the 4th. In Colorado…snowfall was heavy along the eastern slopes of the mountains from the Palmer Divide north. High winds during the storm caused heavy drifting…which blocked all transportation. Snow cover of an inch or more from the storm persisted for 60 consecutive days from the 1st through January 29…1914. Additional snowfall in December and January prolonged the number of days. This is the third longest period of snow cover on record in the city.

2-4

In 1909…post-frontal snowfall totaled 6.1 inches in downtown Denver. Most of the snow…5.9 inches…fell between 6:00 pm on the 2nd and 6:00 pm on the 3rd. North winds were sustained to 18 mph on both the 2nd and 3rd.

2-17

In 1939…more than 2 weeks of unseasonably warm weather made the month the 3rd warmest on record. Seven daily temperature records were set…including the all time record high temperature for the month of 79 degrees on the 5th. Daytime highs were balmy with 14 days in the 60’s and 70’s. Low temperatures dipped to freezing or below on only 5 days. The period was dry with only a trace of snow on the 12th.

3-4

In 1968…strong Chinook winds in Boulder gusting to 52 mph downtown caused 7 thousand dollars in damage. Flying debris damaged cars…houses…and other property in Boulder. West winds gusted to 49 mph late on the 3rd and to 45 mph on the 4th at Stapleton International Airport where the temperature climbed to a high of 60 degrees on the 4th.

In 1970…strong winds whistled through Boulder. Sustained winds of 40 mph with gusts to 70 mph were recorded at the National Bureau of Standards in Boulder. Wind gusts to 50 mph occurred in downtown Denver. No damage was reported. On the 3rd…northwest winds gusted to 40 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 66 degrees on the 4th.

In 1999…heavy snow fell over the foothills and metro Denver. The heaviest snowfall occurred in the foothills south of I-70 and near the Palmer Divide. Snowfall totals included: 25 inches near Tiny Town; 18 inches at Conifer; 15 inches near Evergreen; 14 inches at Chief Hosa…8 miles west of Castle Rock…and near Blackhawk; 12 inches at Pine Junction and 8 miles south of Sedalia; 11 inches atop Floyd Hill and in Roxborough; and 10 inches at Castle Rock. Around metro Denver…snowfall totals included: 10 inches at Highlands Ranch…9 inches at Parker…and 8 inches in Aurora and Wheat Ridge. Elsewhere around the metro area…snowfall generally ranged from 3 to 5 inches. Only 3.2 inches of snow fell at the site of the former Stapleton International Airport. North winds gusted to 32 mph at Denver International Airport on the 3rd.

In 2007…high winds developed in and near the Front Range foothills. Peak wind reports included: 88 mph atop Niwot Ridge; 87 mph atop mines peak; 80 mph…3 miles southeast of Jamestown; 78 mph at Longmont; 74 mph at Table Mesa. A few power outages occurred in Longmont as broken branches downed power lines. Northwest winds gusted to 38 mph at Denver International Airport on the 4th.

Continue reading December 4 to December 10 – This Week in Denver Weather History

Second snowstorm in three days hits Thornton, third round on the way

A view of the Flatirons near Boulder on December 3, 2011 following the second snowstorm in three days. (National Weather Service)
A view of the Flatirons near Boulder on December 3, 2011 following the second snowstorm in three days. (National Weather Service)

The meteorological winter starts on December 1 and Old Man Winter is making sure we know he is around.  Two snowstorms have hit Thornton in a three day span and more snow is on the way.

On Thursday the first storm brought 5.1 inches to Thornton.  Denver officially recorded 5.7 inches at Denver International Airport (DIA).

Shortly before midnight last night, the snow began falling again and continued through noon.  Here in Thornton we recorded 4.9 inches with the latest system.

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It is interesting to note that this brings our seasonal snowfall total to 24.5 inches.  For comparison, we recorded a dismal 21.2 inches during all of the last season!  In an average season, December received 61.7 inches.

Yet another storm system is on its way and is expected to arrive tomorrow evening.  Right now it isn’t look near as impressive as the last two but Thornton may see another inch or two out of it.

Over the longer term, colder than normal temperatures are expected to last through this week.  The first half should be dry but Thursday night into Friday we may see snow again.  Long range models looking even further ahead predict colder than normal temperatures to last through the first half of the month.

Below is time lapse video from our webcams capturing last night’s storm.  Each take 14 hours and compress them into 30 seconds.

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