Denver broke the record high temperature for the date today.
Everyone in the Mile High City has been enjoying an extraordinarily beautiful November day today. As we mentioned in our morning forecast on Examiner.com, temperatures were expected to reach record-setting highs and that has been the case.
At 1:49pm the official temperature as taken at Denver International Airport reached 77 degrees. This broke the record high for the date last of 76 degrees set in 1945 and before that in 1916.
As always, we have to ask the question: Is this really a record or not? Some say Denver’s climate records have forever been altered and as such any weather record should have an asterisk attached to it. Why? Get the details on that story here.
Tornado activity so far in 2009 has been well below normal. This has researchers wondering what has happened to the tornadoes?
Tornado activity in the United States for 2009 is reaching unusually low levels according to statistics from NOAA’s Storm Prediction Center (SPC). By its latest count as of Sunday, November 1st, 1040 tornado reports have been received this year placing it in the 10th percentile since 1954 (see chart below).
Tornadoes occur in every month on the calendar but 2009 started with far below normal numbers for the first three months of the year. As the traditional severe weather season approached during the spring, tornado numbers returned to near average but have since fallen into a decline.
Similarly, tornado deaths in 2009 are far below the average. The three year running average from 2006 to 2008 saw an average of 91 fatalities per year. Over the longer term, the United States experiences 80 per year. Thus far in 2009 only 22 deaths have been reported as a result of twisters. There was nearly a five month period from May 13th to October 9th when there were no deaths at all recorded.
Tropical cyclone activity continues to decline despite beliefs that it would increase as a result of global warming. (NOAA)
For the third year in a row, tropical cyclone activity sits near a 30 year low and the 2009 Atlantic hurricane season is showing low levels not seen since 1997. Researchers at Florida State University said that despite what has appeared to be an active season in the Pacific, continual declines in activity are being realized across the globe.
A year ago researcher Ryan Maue documented ‘a remarkable downward trend’ and that trend has continued to flirt with historic lows. Using a measurement called the Accumulated Cyclone Energy index (ACE), Maue said that “2009 as a whole is still well behind normal climatology.”
The ACE index is the standard for measuring tropical cyclone activity. It combines the frequency, duration and intensity of the storms into a numerical index that can be used for historical comparisons.
Through October 2009, the global ACE index for the year sits at 525 – well below the norm of 769. Similarly, if looked at separately both the northern and southern hemisphere activity show well below average numbers. Breaking it down further by basins, the North Atlantic, Western Pacific, Eastern Pacific and North Indian basins are seeing below average ACE as well.
October 2009 in Denver was the second coldest and fifth snowiest October on record.
Most of the month of October was cooler than normal in the Mile High City and now that the month is over we see just how cold it was. Denver finished October 2009 with an average temperature more than 8 degrees below normal and had 9 inches more snow than what is normal for the month.
October 2009’s 42.9 degree average makes it the second coldest since record keeping began in 1873 – 136 years ago! re in Thornton we were actually slightly cooler with an average temperature of 42.0 degrees. Only October 1969 was colder as that year Denver had an average temperature of a chilly 39 degrees. He
Across the board temperatures for the month were well below normal. The average daily high temperature of 54.7 degrees was 11.3 degrees below the normal of 66.0 degrees. Low temperatures were similarly well below normal with an average of 31.1 degrees – 4.8 degrees below the normal of 35.9.
Thornton was warmer for daytime highs than the Denver official temperatures as we averaged 55.6 degrees. In terms of low temperatures, we were cooler having averaged 30.7 degrees.
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Real time weather conditions are updated to the page every three hours. Forecasts are issued and updated to the site regularly and perhaps most importantly, weather alerts and warnings are posted as they happen in real-time!
By becoming a fan, you will receive this information right in your regular Facebook news feed. All of it is there at a glance and ensures that you know what is going on with Thornton’s ever changing weather!
November is Denver's second snowiest month. What else can we expect?
Typically November is a quiet weather month with plenty of nice, fall days but it can also turn wet with plenty of snow and moisture. Just like Forest Gump’s proverbial box of chocolates, you never quite know what you are going to get.
Looking into the weather history books, we see that November is actually Denver’s second snowiest month, second only to March (April is third). Historically we average 10.7 inches of snow during the month.
In 1994, November was the snowiest month of that year with 16.9 inches – over 12 inches of which fell within a 12 hour period on the 13th and 14th. In 1991 we saw 29.6 inches of snow (the 2nd snowiest November) and the following year in 1992 we had 20.1 inches of snow (the 8th snowiest November). Those examples though pale in comparison to the snowiest November on record which was in 1946 when a whopping 42.6 inches of snow fell!
It isn’t always that snowy though. November 2002 was at the time the 16th month in a row with below normal precipitation and the calendar year of 2002 marked the driest in Denver weather history. This pattern of below normal precipitation continued for 19 months through February 2003. Since 1882, one year (1949) recorded no snow, six more recorded only a trace of snow and four had less than one inch of snow.
November 1 to November 7 - This week in Denver weather history
As we enter Denver’s second snowiest month, we of course see plenty of events involving that dominant weather condition. Sadly we also see two occassions when the winter-like weather turned deadly.
In 1972…heavy snowfall totaled 15.5 inches at Stapleton International Airport. However…the heaviest snow occurred on Halloween night when 7 inches fell on trick-or-treaters during a short 3-hour period. I-25 was closed south of Denver. North winds gusting to 29 mph caused some blowing snow on the 1st. The snow started late on the 29th and ended during the mid afternoon on the 1st. The greatest snow depth on the ground at Stapleton International Airport was 13 inches on the 1st.
From the 31st to the 1st:
In 1951…6.4 inches of snowfall were measured at Stapleton Airport.
In 1989…a Halloween storm dropped 3 to 6 inches of snow on metro Denver with the adjacent foothills receiving 5 to 10 inches. Snowfall totaled 4.5 inches at Stapleton International Airport…where north winds gusted to 31 mph on the 31st. Most of the snow fell on the evening of the 31st…but the storm left icy streets throughout metro Denver on the morning of the 1st…making it a “spooky” commute for many motorists.
In 2004…heavy snow fell in and near the foothills of Jefferson and Douglas counties. Storm total snowfall included: 14.5 inches in Aspen Park…10 inches at Roxborough State Park and near Sedalia…8 inches near Bergen Park…and 7 inches in Highlands Ranch. Snowfall totaled only 3.2 inches in the Denver Stapleton area. Post-frontal northeast winds gusted to 41 mph at Denver International Airport.
On the 1st:
In 1896…northwest Chinook winds sustained to 40 mph with gusts to 46 mph warmed the temperature to a high of 60 degrees in the city.
In 1973…wind gusts to 92 mph were recorded in Boulder. West winds gusted to 41 mph at Stapleton International Airport where the Chinook winds warmed the temperature to a high of 70 degrees.
In 1989…a 39-year-old Lakewood man in a motorized wheelchair was found dead of exposure early in the morning after an overnight snowfall dumped 3 to 6 inches of snow across metro Denver.
From the 1st to the 2nd:
In 1892…snowfall totaled 5.0 inches in downtown Denver. This was the only snow of the month.
In 1956…heavy snowfall totaled 7.0 inches at Stapleton Airport. The storm was accompanied by much blowing and drifting snow. North winds gusted to 47 mph.
In 1991…the storm system which hit the Front Range at the end of October finished the job during the start of November. Six inches of new snow were recorded at both Rollinsville and Morrison…while 2.9 inches of snow fell at Stapleton International Airport where northeast winds gusted to 17 mph. The temperature climbed to a high of only 19 degrees on the 2nd…setting a record low maximum for the date.
In 1995…a winter storm dropped 5 to 8 inches of snow in the Front Range foothills. The exception was at Golden gate canyon where a foot of new snow was measured. Icy roads…fog…and blowing snow along I-70 in the foothills west of Denver caused dozens of accidents. One man was killed when he lost control of his vehicle and was ejected when his truck hit a median and rolled over. At least 20 other accidents involved minor injuries. Only 1.0 inch of snow fell at the site of the former Stapleton International Airport where some freezing rain also fell.
This image from the ThorntonWeather.com webcam was captured at the height of the storm.
A two-day storm that saw areas around Denver measuring snow in terms of feet has moved out of the area and onto the plains. The lingering effects of the storm will be felt Friday in terms of slick roads in Denver and blizzard conditions to the east.
The early winter storm, while not entirely unusual, was the first major snow storm of the season and put Coloradoans to the test. Mercifully, the snow never fell at a particularly heavy rate and while it lingered for a long time, it allowed road crews and residents time to stay on top of the snowfall. Most schoolchildren were pleased to have received at least one snow day from the storm and many were the recipients of two unplanned days off.
At Denver International Airport, initial success at holding the storm’s effects at bay on Wednesday began to whither under the white onslaught on Thursday as winds picked up and the storm shifted east. Hundreds of flights were canceled from the airport’s major carriers including United Airlines, Frontier Airlines and Southwest Airlines.
At the height of the storm’s effects, the airport was reduced to two operating runways from the usual six and delays of up to four hours were occurring. All airlines anticipate being able to operate a normal flight schedule today.
How much snow did the Denver area receive? Here are some of the snowfall totals:
Aurora: 16 inches
Boulder: 18.8 inches
Broomfield: 20 inches
Centennial: 17 inches
Coal Creek Canyon: 46 inches
Denver International Airport: 12 inches (as of 6:00am Thursday)
Evergreen: 30 inches
Highlands Ranch: 24.5 inches
Littleton: 28.5 inches
Longmont: 12.4 inches
Parker: 14.5 inches
Thornton: 14.1 inches Click here for a complete listing of storm reports.
The storm did push Denver into the record books and the ‘top 10 snowiest Octobers’ list. The National Weather Service will publish the official snow total from DIA for yesterday but even without the snow from yesterday, October 2009 makes the list. As of 6:00am on Thursday, DIA had recorded 14.5 inches for the month (12 inches from this storm). That makes it number 7 on the top 10 list for snowiest Octobers on record since 1882. Once today’s measurement is released, it is possible it will climb further.
From the evening of October 27, 2009 through October 29, 2009, the Denver metro area was struck by a major, early winter snowstorm. The mountains and foothills to the immediate west of Denver were measuring the snowfall in feet while in the city more than a foot of snow fell in less than 72 hours. Here in Thornton we recorded 14.1 inches of snow during the event.
This time lapse video below was captured by our east facing webcam. It begins early Tuesday morning (October 27th) and runs through midnight on Thursday, October 29th. As it starts, you can see the first day started out nice enough but by evening the wind was blowing and rain was falling. That soon changed to snow and the snowstorm was in full force for two days.
Live CDOT webcam image from 120th & I-25 looking south.
Update, 6:10pm: As the storm starts to move to the east, blizzard conditions on the plains east of Denver are causing problems. I-70 remains closed from Airpark Road to Burlington and I-76 is closed from Lochbuie to Fort Morgan. Storm reports indicate blizzard conditions prevail with limited visibility and drifting snow. A Blizzard Warning is in effect for much of the northeastern Colorado plains and will remain so until 6:00am Friday.
Closer to town, things are finally starting to ease up along the Front Range and in the metro area. Gusty winds and cold temperatures will keep wind chills down into the teens and make it uncomfortable to be outside. Drifting snow on roadways is possible thanks to those gusty winds from the north. Additional light snow can be expected, mainly in areas to the west and south.
The Winter Storm Warning for the metro area was allowed to expire at 6:00pm as planned. However, roads are likely to get slick as temperatures drop overnight so please use caution.
Update, 12:38pm: October 2009 enters the record books as the 7th snowiest October on record in Denver. The National Weather Service reported that as of 6:00am today, the official station at Denver International Airport had recorded 14.5 inches of snow fall for this month. 10.6 inches of that had fallen in the previous 24 hours. With the early measurement and the fact the snow is expected to continue throughout the day, it is possible the month will climb further up the charts (see below).
It is also notable that Denver will likely finish the month as one of the coldest Octobers on record. Thus far the average temperature for October 2009 has been 43.9 degrees. Were the month to end today, that would place it in a tie for the third coldest October on record.
Update, 10:35am: The snow keeps falling! Light snow will continue across the urban corridor for the rest of the morning with 1 to 4 inches additional accumulation possible. Some areas south may see heavier snow rates, particularly to the south and east.
Blizzard-like conditions are possible in open areas where there is a good bit of wind blowing. Travel to the east is best avoided at this time due to low visibility and icy conditions. Chain laws are actually in effect on I-76 at Wiggins due to hazardous conditions. I-25 remains closed from Wellington to the Wyoming border.
At Denver International Airport, flight delays continue to mount. Delays of 3 to 4 hours are being experienced for arrivals and departures as DIA ground crews struggle to keep up with the falling snow. Frontier Airlines reports that additional cancelations are possible.
Storm spotters have reported amounts as high as 44 inches in Coal Creek Canyon and snowfall reaching near 3 feet is being seen in many places in the foothills. Closer to town, west and south are reporting up to 18 inches while central Denver is reporting close to one foot. ThorntonWeather.com has recorded 14.1″ so far! Click here for the latest storm reports from across the area.
ThorntonWeather.com is of course your source for local information on the storm as it develops. We will also be updating the Denver Weather Examiner site as things develop. Here are some quick links to pages you may find handy:
Update, 6:35am, Thursday, October 29, 2009: Thornton and a large portion of Colorado continue to be hammered by a two-day long storm that has dumped more than two feet of snow in the adjacent foothills and a foot across much of the metro area. At ThorntonWeather.com we have recorded 13.2 inches of snow thus far for the event. While the early winter storm has created its share of problems, the relatively slow snowfall rate has allowed it to be manageable by most standards.
