The Weather Wire

 

November 2010                                                                                                            Volume 17 Number 11

 

Contents

 

 

 
·   Winter Weather
 

·   Drought Monitor

 

·   October

    Summary

 

·   October Stats

·   November Preview

 

·   Sunrise/Sunset

 

·   Precipitation Totals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

October

Avg High - 69.7

Avg Low - 40.9

Snow - 0.0"

Season Snow - 0.0"

Precipitation - 0.54"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

November

Avg High - 51.5

Avg Low - 23.5

Avg Snow -  10.7"

Avg Precip - 0.98"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Skyview Weather 

2350 N Rocky View Rd

Castle Rock, CO 80108

 

Phone: (303) 688-9175

Fax: (303) 380-3338

 

E-mail:    

tim@skyview-wx.com

 

We’re on the Web!

http://www.skyview-wx.com/

 

Copyright 2010

Skyview Weather

Winter Weather Definitions... 

With winter looking like it will make a visit to Colorado this month it is time to review all the winter weather definitions since we will be seeing a lot of these over the coming winter months.

The National Weather Service issues many different types of watches and warnings during the winter months.  Here is what they mean:

WINTER STORM WATCH:

A winter storm watch is issued when winter storm conditions are possible within the next 12 to 36 hours, but the timing, intensity, or occurrence may still be uncertain.

WINTER STORM WARNING:

A winter storm warning is issued when heavy snow is occurring or will develop in the next 18 hours.  The heavy snow may be accompanied by wind and blowing snow. 

BLIZZARD WARNING:

A blizzard warning is issued when the following conditions are expected for at least 3 hours:     Sustained winds of 35mph or greater with considerable falling and/or drifting snow lowering visibilities to less than 1/4 mile.  Remember, snow does not necessarily need to be falling and dangerous wind chills are often observed during blizzard events.

WINTER WEATHER ADVISORY:

A winter weather advisory for snow is issued when these general snow accumulations are expected:     Between 4 and 8 inches in 12 hours in the mountains.  Between 3 and 6 inches in 12 hours at lower elevations, such as Denver Metro.

 

A winter weather advisory for snow and blowing snow is issued when falling snow is accompanied by blowing snow to cause travel problems due to lowered visibilities and drifting snow.

 

A winter weather advisory for blowing snow is issued when wind blown snow will occasionally reduce visibilities and create a hazard for travelers.

FROST/FREEZE WARNING:

Below freezing temperatures are expected and may cause significant damage to plants, crops, or fruit trees in areas unaccustomed to freezing temperatures.  Usually issued for first frost/freeze of season and again in spring for late frost/freezes.  

HIGH WIND WARNING:

A high wind warning is issued for the following conditions:     Sustained winds of 50mph for at least 1 hour, or gusts to 75mph for any duration in the mountains and foothills.  Sustained winds of 40mph for at least 1 hour, or gusts to 58mph for any duration at lower elevations away from the foothills. 
 

We as weather forecasters use different wording or terms when we describe a snow event.  Whether it is just some flurries or a large winter storm we use different words that best suit the snow event that is expected. 

Snow

FLURRIES - Light snow falling for short durations. No accumulation or light dusting is all that is expected.
SHOWERS - Snow falling at varying intensities for brief periods of time. Some accumulation is possible. You can best relate to these by thinking about a summer shower, but instead of rain you get snow.
SQUALLS - Brief, intense snow showers accompanied by strong, gusty winds. Accumulation may be significant. Snow squalls are best known in the Great Lakes region.
BLOWING SNOW - Wind-driven snow that reduces visibility and causes significant drifting. Blowing snow may be snow that is falling and/or loose snow on the ground picked up by the wind.
BLIZZARD - Winds over 35 mph with snow and blowing snow, reducing visibility to near zero.  

Sleet

Rain drops that freeze into ice pellets before reaching the ground. Sleet usually bounces when hitting a surface and does not stick to objects. However, it can accumulate like snow and cause a hazard to motorists.

Freezing Rain

Rain that falls onto a surface with a temperature below freezing. This causes it to freeze to surfaces, such as trees, cars, and roads, forming a coating or glaze of ice. Even small accumulations of ice can cause a significant hazard.

Snow and or severe cold can be potentially life threatening and every year we see cold and snow related deaths.

Everyone is potentially at risk during winter storms. The actual threat to you depends on your specific situation. Recent observations indicate the following:

  • Related to ice and snow:
    • About 70% occur in automobiles.
    • About 25% are people caught out in the storm.
  • Related to exposure to cold:
    • 50% are people over 60 years old.
    • Over 75% are males.
    • About 20% occur in the home.

FROSTBITE

Frostbite is damage to body tissue caused by that tissue being frozen. Frostbite causes a loss of feeling and a white or pale appearance in extremities, such as fingers, toes, ear lobes, or the tip of the nose. If symptoms are detected, get medical help immediately! If you must wait for help, slowly re-warm affected areas. However, if the person is also showing signs of hypothermia, warm the body core before the extremities.

HYPOTHERMIA: LOW BODY TEMPERATURE

Warning signs - uncontrollable shivering, memory loss, disorientation, incoherence, slurred speech, drowsiness, and apparent exhaustion.

Detection - Take the person's temperature. If below 95F (35C), immediately seek medical care! If medical care is not available, begin warming the person slowly. Warm the body core first. If needed, use your own body heat to help. Get the person into dry clothing, and wrap them in a warm blanket covering the head and neck. Do not give the person alcohol, drugs, coffee, or any hot beverage or food; warm broth is better. Do not warm extremities (arms and legs) first! This drives the cold blood toward the heart and can lead to heart failure.

WIND CHILL

The wind chill is based on the rate of heat loss from exposed skin caused by combined effects of wind and cold. As the wind increases, heat is carried away from the body at an accelerated rate, driving down the body temperature. Animals are also affected by wind chill.

When CAUGHT in a Winter Storm...

OUTSIDE

Find shelter:

    • try to stay dry
    • cover all exposed parts of the body.

No shelter:

    • prepare a lean-to, wind-break, or snow cave for protection from the wind.
    • build a fire for heat and to attract attention.
    • place rocks around the fire to absorb and reflect heat.

Do not eat snow: It will lower your body temperature. Melt it first.

 

IN A CAR OR TRUCK

Stay in your car or truck. Disorientation occurs quickly in wind-driven snow and cold.
Run the motor about ten minutes each hour for heat:

    • open the window a little for fresh air to avoid carbon monoxide poisoning.
    • make sure the exhaust pipe is not blocked.

Make yourself visible to rescuers:

    • turn on the dome light at night when running engine.
    • tie a colored cloth (preferably red) to your antenna or door.
    • raise the hood indicating trouble after snow stops falling.

Exercise from time to time by vigorously moving arms, legs, fingers, and toes to keep blood circulating and to keep warm.

 

AT HOME OR IN A BUILDING

Stay inside. When using ALTERNATIVE HEAT from a fireplace, wood stove, space heater, etc.:

    • use fire safeguards.
    • properly ventilate.

No heat:

    • close off unneeded rooms.
    • stuff towels or rags in cracks under doors.
    • cover windows at night.

Eat and drink. Food provides the body with energy for producing its own heat. Keep the body replenished with fluids to prevent dehydration.
Wear layers of loose-fitting, lightweight, warm clothing. Remove layers to avoid overheating, perspiration, and subsequent chill.

 

Colorado sees it share of snow during the winter months.  The best time to prepare for the next snow is now while the weather is mild and dry.  Take an inventory of you winter supplies both for the car and the home and stock in items that you need.  Be prepared and the winter snows will be a lot less bothersome this year.  

Drought Update

Dry conditions since mid August have brought areas of drought to much of Colorado again.

The map below shows forecasted temperature deviances for November 2010. As can be seen, above normal temperatures are expected statewide for the month.

The map below shows forecasted precipitation deviances for November 2010.  Below normal precipitation is expected across southern Colorado for November, with normal precipitation northern Colorado.

Some areas of drought have returned and are likely to persist across north central Colorado.

October Summary

October of 2010 continued to produce above normal temperatures and below normal precipitation.  Temperatures have actually been above average every month since May with the last two months of September and October being more than 4 degrees above the monthly mean temperature.  There were only two days with a temperature below freezing compared to nearly 9 days on normal years.  The warm and rather dry October resulted in only the 15th October since 1872 without even a trace of snow reported in Denver.  Without snowfall at all this season we are currently 6.2" below average as of the 1st of November.  Total precipitation for the month was 0.54" measured at DIA compared to 0.99" on average.  Currently year to date the precipitation deficit has grown to 2.2" below normal with 11.15" so far this year and 13.35" on average.  There were a few windy days towards the end of the month with a peak wind gust of 51mph reported on the 25th, otherwise October of 2010 was fairly quiet without any scary weather for Halloween which really happens more years than not contrary to popular belief.

October Stats

TEMPERATURE (IN DEGREES F)

 

 

 

 

 

 

AVERAGE MAX

69.7

NORMAL

66.0

DEPARTURE

3.7

AVERAGE MIN

40.9

NORMAL

35.9

DEPARTURE

5.0

MONTHLY MEAN

55.3

NORMAL

51.0

DEPARTURE

4.3

HIGHEST

85 on the 3rd

LOWEST

20 on the 28th

 

 

 

 

 

 

DAYS WITH MAX 90 OR ABOVE

0

NORMAL

0

DAYS WITH MAX 32 OR BELOW

0

NORMAL

0.3

DAYS WITH MIN 32 OR BELOW

2

NORMAL

8.6

DAYS WITH MIN ZERO OR BELOW

0

NORMAL

0

 

 

 

 

 

 

TEMPERATURE RECORDS

 

No temperature records tied or broken.

 

 

 

 

 

 

 

HEATING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

300

NORMAL

436

DEPARTURE

-136

SEASONAL TOTAL

335

NORMAL

582

DEPARTURE

-247

 

 

 

 

 

 

COOLING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

8

NORMAL

0

DEPARTURE

8

YEARLY TOTAL

870

NORMAL

696

DEPARTURE

174

 

 

 

 

 

 

PRECIPITATION (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

0.54

NORMAL

0.99

DEPARTURE

-0.45

YEARLY TOTAL

11.15

NORMAL

13.35

DEPARTURE

-2.20

GREATEST IN 24 HOURS

0.34" on the 12th

DAYS WITH MEASURABLE PRECIPITATION

4

 

 

 

 

 

SNOWFALL (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

0.0

NORMAL

4.1

DEPARTURE

-4.1

SEASONAL TOTAL

0.0

NORMAL

6.2

DEPARTURE

-6.2

GREATEST IN 24 HOURS

0.0

GREATEST DEPTH

0.0

 

 

 

 

 

 

WIND (IN MILES PER HOUR)

 

 

 

 

 

 

AVERAGE SPEED

9.1mph

PEAK WIND GUST

51mph from the N on the 25th

 

 

 

 

 

 

MISCELLANEOUS WEATHER

 

 

 

 

 

 

NUMBER OF DAYS WITH THUNDERSTORMS

3

NORMAL

4

NUMBER OF DAYS WITH HEAVY FOG

2

NORMAL

1

NUMBER OF DAYS WITH HAIL

0

 

 

PERCENT OF SUNSHINE

NA

NORMAL

74%

November Preview

The trend of abnormally warm and dry weather is expected to continue through the first half of the month with a more active weather pattern as the month comes to a close.  Typically November is Denver's 2nd snowiest month of the year behind March with 10.7" on average and 3 "significant" snows of greater than 1".  This year below normal snowfall is expected with 1-2 snow events of greater than 1".  Temperatures really begin to drop off in November with 51.5 degrees for an average high and 23.5 for an average low with a mean temperature of 37.5 degrees.  November of 2010 will likely end up significantly warmer than average.  Enjoy the pleasant weather while it lasts as the weather pattern here in Colorado can turn on a dime and there will be a period where conditions are equally as cold and snowy.

DENVER'S NOVEMBER CLIMATOLOGICALLY NORMAL

(NORMAL PERIOD 1971-2000)

 

 

TEMPERATURE

 

 

 

AVERAGE HIGH

51.5

AVERAGE LOW

23.5

MONTHLY MEAN

37.5

DAYS WITH HIGH 90 OR ABOVE

0

DAYS WITH HIGH 32 OR BELOW

3

DAYS WITH LOW 32 OR BELOW

24

DAYS WITH LOWS ZERO OR BELOW

Less than 1

 

 

PRECIPITATION

 

 

 

MONTHLY MEAN

0.98"

DAYS WITH MEASURABLE PRECIPITATION

6

AVERAGE SNOWFALL IN INCHES

10.7"

DAYS WITH 1.0 INCH OF SNOW OR MORE

3

 

 

MISCELLANEOUS AVERAGES

 

 

 

HEATING DEGREE DAYS

826

COOLING DEGREE DAYS

0

WIND SPEED (MPH)

8.2mph

WIND DIRECTION

South

DAYS WITH THUNDERSTORMS

Less than 1

DAYS WITH DENSE FOG

1

PERCENT OF SUNSHINE POSSIBLE

64%

 

 

EXTREMES

 

 

 

RECORD HIGH

80 on 11/8/2006

RECORD LOW

-18 on 11/29/1877

WARMEST

50.9 in 1949

COLDEST

22.0 in 1880

WETTEST

3.21" in 1946

DRIEST

Trace in 1949, 1901, 1899

SNOWIEST

42.6" in 1946

LEAST SNOWIEST

0.0" in 1949
 

Sunrise/Sunset (July - Dec Denver area)

                 JUL            AUG           SEP              OCT            NOV          DEC
______________________________________________________________________________
           sr - ss           sr - ss          sr - ss           sr - ss           sr - ss           sr - ss
 01  0535-0831 | 0558-0813 | 0627-0732 | 0656-0643 | 0728-0558 | 0701-0436  01
 02  0536-0831 | 0559-0812 | 0628-0731 | 0657-0642 | 0729-0556 | 0702-0435  02
 03  0536-0831 | 0600-0811 | 0629-0729 | 0658-0640 | 0731-0555 | 0703-0435  03
 04  0537-0831 | 0601-0810 | 0630-0727 | 0659-0639 | 0732-0554 | 0704-0435  04

 05  0537-0831 | 0602-0809 | 0631-0726 | 0700-0637 | 0733-0553 | 0705-0435  05
 06  0538-0831 | 0603-0808 | 0632-0724 | 0701-0635 | 0734-0552 | 0706-0435  06
 07  0539-0830 | 0604-0807 | 0633-0723 | 0702-0634 | 0635-0451 | 0707-0435  07
 08  0539-0830 | 0605-0806 | 0634-0721 | 0703-0632 | 0636-0450 | 0708-0435  08

 09  0540-0830 | 0606-0804 | 0635-0719 | 0704-0631 | 0637-0449 | 0709-0435  09
 10  0541-0829 | 0607-0803 | 0636-0718 | 0705-0629 | 0639-0448 | 0710-0435  10
 11  0541-0829 | 0608-0802 | 0637-0716 | 0706-0628 | 0640-0447 | 0710-0435  11
 12  0542-0828 | 0609-0801 | 0638-0715 | 0707-0626 | 0641-0446 | 0711-0435  12

 13  0543-0828 | 0610-0759 | 0639-0713 | 0708-0625 | 0642-0445 | 0712-0436  13
 14  0543-0827 | 0611-0758 | 0640-0711 | 0709-0623 | 0643-0445 | 0713-0436  14
 15  0544-0827 | 0612-0757 | 0641-0710 | 0710-0622 | 0644-0444 | 0713-0436  15
 16  0545-0826 | 0612-0755 | 0641-0708 | 0711-0620 | 0645-0443 | 0714-0436  16

 17  0546-0826 | 0613-0754 | 0642-0706 | 0712-0619 | 0646-0442 | 0715-0437  17
 18  0546-0825 | 0614-0753 | 0643-0705 | 0713-0617 | 0648-0442 | 0715-0437  18
 19  0547-0825 | 0615-0751 | 0644-0703 | 0714-0616 | 0649-0441 | 0716-0437  19
 20  0548-0824 | 0616-0750 | 0645-0701 | 0715-0614 | 0650-0440 | 0716-0438  20

 21  0549-0823 | 0617-0749 | 0646-0700 | 0716-0613 | 0651-0440 | 0717-0438  21
 22  0550-0822 | 0618-0747 | 0647-0658 | 0717-0612 | 0652-0439 | 0717-0439  22
 23  0551-0822 | 0619-0746 | 0648-0656 | 0718-0610 | 0653-0439 | 0718-0439  23
 24  0551-0821 | 0620-0744 | 0649-0655 | 0719-0609 | 0654-0438 | 0718-0440  24

 25  0552-0820 | 0621-0743 | 0650-0653 | 0720-0608 | 0655-0438 | 0719-0441  25
 26  0553-0819 | 0622-0741 | 0651-0652 | 0722-0606 | 0656-0437 | 0719-0441  26
 27  0554-0818 | 0623-0740 | 0652-0650 | 0723-0605 | 0657-0437 | 0719-0442  27
 28  0555-0817 | 0624-0738 | 0653-0648 | 0724-0604 | 0658-0437 | 0720-0443  28

 29  0556-0816 | 0625-0737 | 0654-0647 | 0725-0602 | 0659-0436 | 0720-0443  29
 30  0557-0815 | 0626-0735 | 0655-0645 | 0726-0600 | 0700-0436 | 0720-0444  30
 31  0558-0814 | 0627-0734 |                   | 0727-0559 |                    | 0720-0445  31



Snowfall

Sept 2010 to May 2011

City

Sept/ Oct

Nov Dec

Jan

Feb Mar

Apr/ May

Seasonal Totals

Aurora (Central)

0.0             0.0
Brighton 0.0             0.0
Broomfield 0.0             0.0

Castle Rock 4 NE

0.0             0.0

Colo Sprgs Airport

0.0             0.0
Denver DIA 0.0             0.0

Denver Downtown

0.0             0.0

Golden

0.0             0.0

Fort Collins

TR             TR

Highlands Ranch

0.0             0.0

Lakewood

0.0             0.0

Littleton

0.0             0.0

Parker

0.0             0.0

Sedalia - Hwy 67

0.0             0.0

Thornton

0.0             0.0

Westminster

0.0             0.0

Wheatridge

0.0             0.0