The Weather Wire

 

July 2009                                                                                                            Volume 17 Number 07

 

Contents

 

 

 
·   Wet Weather Pattern?
 

·   Drought Monitor

 

·   June

    Summary

 

·   June Stats

 

·   July Preview

 

·   Sunrise/Sunset

 

·   Rain Totals

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June

Avg High - 77.7

Avg Low - 51.1

Snow - 0.0"

Season Snow - 38.1"

Precipitation - 4.86"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

July

Avg High - 88.0

Avg Low - 58.7

Avg Snow -  0.00"

Avg Precip - 2.16"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

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Copyright 2009

Skyview Weather

Wet Weather Pattern?

Although DIA only reported 1.30” of rainfall during the month of May this did not represent the Denver area well as many locations received between 2.0-4.0”.  July was very wet all locations along the Front Range from Trinidad through Cheyenne receiving above normal precipitation.  Really, ever since the last week of March the weather pattern has been very active with above normal precipitation for many areas in Colorado.  Is this wet weather pattern just a short term cycle or is there more to it than that? 

NOAA indicated recently that, “monsoon-like weather patterns have been present in Arizona…and that the main monsoon season likely will arrive several weeks early and have a greater impact in eastern Colorado (than the west slope).”  The monsoon season typically starts around the 4th of July in recent years, but there is no question that the moisture we have been receiving has been sub-tropical in origin the last month.  I believe it is safe to say that the monsoon season has already begun in spurts and will resume by later this month resulting in above normal thunderstorm activity and the potential for above normal rainfall.  Remember the term monsoon really just means a seasonal shift in the overall wind pattern, but if those winds carry moisture rich air then rainfall becomes more likely. 

NWS/NOAA indicated that, “we appear to be transition from a La Nina to El Nino cycle (though data in the next few weeks will provide greater certainty).  This could lead to some substantial rainfall flooding.”  The transition from a La Nina to an El Nino cycle will result in warmer ocean temperatures in the eastern Pacific and thus an increase in available moisture for the desert southwest and other areas affected by the summer monsoon.  With additional moisture storms may be stronger and produce more rainfall.  This could also lead to an above normal snowfall this upcoming winter! 

Overall, the number of thunderstorm days will likely be above normal this summer as there will be more moisture available and with more chances for rain our total precipitation amounts will likely be above normal as well as we have already experienced in June.  This would be a big change compared to last year as we ended up around 33% below average for the year in precipitation.  Already this year DIA has reported over 10.0” of precipitation which is about 2/3 or normal for an entire year and we have more than 5 months to go.    

 

Drought Update

With the widespread precipitation of the last several months, little areas of drought remain in Colorado.

The map below shows forecasted temperature deviances for July 2009. As can be seen, it is expected that much of Colorado to have  normal temperatures for the month of July 2009, with far western Colorado expected to have above normal temperatures. 

The map below shows forecasted precipitation deviances for July 2009.  Most of Colorado is expected to have above normal precipitation for July 2009.

Little in the way of drought remains in Colorado, with no changes expected.

June Summary

June of 2009 came ever so close to breaking the record precipitation for the month with 4.86" measured at DIA.  This was just 0.10" shy of the old record set all the way back in 1882.  On the 23rd, 1.64" of rain fell setting the daily record for the date.  There were 18 days with thunderstorms in the area with 15 of those day producing measurable precipitation.  All of the wet weather led to well below normal temperatures with the monthly mean 3.2 degrees below normal.  June is typically the most active weather month when it comes to severe weather and this June did not disappoint.  There were numerous tornado reports and funnels reported all along the Front Range with many strong storms producing damaging hail and strong winds.  For the year we are currently at 10.38" of precipitation already 2/3 of a years worth of moisture.  Normal is 7.07" a far cry from 2008 when Denver only had 3.04" for the entire year and 0.73" for the month of June.

June Stats

TEMPERATURE (IN DEGREES F)

 

 

 

 

 

 

AVERAGE MAX

77.7

NORMAL

82.1

DEPARTURE

-4.4

AVERAGE MIN

51.1

NORMAL

53.0

DEPARTURE

-1.9

MONTHLY MEAN

64.4

NORMAL

67.6

DEPARTURE

-3.2

HIGHEST

89 on the 29th and 30th

LOWEST

41 on the 8th

 

 

 

 

 

 

DAYS WITH MAX 90 OR ABOVE

0

NORMAL

6.3

DAYS WITH MAX 32 OR BELOW

0

NORMAL

0

DAYS WITH MIN 32 OR BELOW

0

NORMAL

0

DAYS WITH MIN ZERO OR BELOW

0

NORMAL

0

 

 

 

 

 

 

TEMPERATURE RECORDS

 
No temperature records tied or broken
 
           

HEATING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

78

NORMAL

60

DEPARTURE

18

SEASONAL TOTAL

5616

NORMAL

6128

DEPARTURE

-512

 

 

 

 

 

 

COOLING DEGREE DAYS

 

 

 

 

 

 

MONTHLY TOTAL

68

NORMAL

136

DEPARTURE

-68

YEARLY TOTAL

94

NORMAL

161

DEPARTURE

-67

 

 

 

 

 

 

PRECIPITATION (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

4.86

NORMAL

1.56

DEPARTURE

3.30

YEARLY TOTAL

10.38

NORMAL

7.07

DEPARTURE

3.31

GREATEST IN 24 HOURS

1.64" on the 23rd, single day record for date

DAYS WITH MEASURABLE PRECIPITATION

15

 

 

 

 

 

SNOWFALL (IN INCHES)

 

 

 

 

 

 

MONTHLY TOTAL

0

NORMAL

1.3

DEPARTURE

-1.3

SEASONAL TOTAL

38.1

NORMAL

61.7

DEPARTURE

-23.6

GREATEST IN 24 HOURS

NA

GREATEST DEPTH

NA

 

 

 

 

 

 

WIND (IN MILES PER HOUR)

 

 

 

 

 

 

AVERAGE SPEED 8.4 mph

PEAK WIND GUST

68 mph from the west

 

 

 

 

 

 

MISCELLANEOUS WEATHER

 

 

 

 

 

 

NUMBER OF DAYS WITH THUNDERSTORMS

18

NORMAL

10

NUMBER OF DAYS WITH HEAVY FOG

6

NORMAL

< 1

NUMBER OF DAYS WITH HAIL

3

 

 

PERCENT OF SUNSHINE

51%

NORMAL

70%

 

 

 

July Preview

July is typically when the monsoon season gets under way with afternoon thunderstorms 1 out of every 3 days.  The storms however have a tendency to be less severe than storms in the month of June as far as tornadoes go.  Severe weather is still common with hail being the greatest threat, but the flooding threat increases due to upper level steering winds becoming lighter resulting in slower storm motion.  The month is typically very warm with about half of the days reaching 90 degrees or more.  This July will likely be slightly below normal in temperatures and at or above normal in precipitation.     

DENVER'S NOVEMBER CLIMATOLOGICALLY NORMAL

(NORMAL PERIOD 1971-2000)

 

 

TEMPERATURE

 

 

 

AVERAGE HIGH

88.0

AVERAGE LOW

58.7

MONTHLY MEAN

73.4

DAYS WITH HIGH 90 OR ABOVE

15

DAYS WITH HIGH 32 OR BELOW

0

DAYS WITH LOW 32 OR BELOW

0

DAYS WITH LOWS ZERO OR BELOW

0

 

 

PRECIPITATION

 

 

 

MONTHLY MEAN

2.16"

DAYS WITH MEASURABLE PRECIPITATION

9

AVERAGE SNOWFALL IN INCHES

0

DAYS WITH 1.0 INCH OF SNOW OR MORE

0

 

 

MISCELLANEOUS AVERAGES

 

 

 

HEATING DEGREE DAYS

1

COOLING DEGREE DAYS

261

WIND SPEED (MPH)

8.3 mph

WIND DIRECTION

South

DAYS WITH THUNDERSTORMS

11

DAYS WITH DENSE FOG

Less than 1

PERCENT OF SUNSHINE POSSIBLE

71%

 

 

EXTREMES

 

 

 

RECORD HIGH

105 on the 20th in 2005

RECORD LOW

42 on the 4th in 1903

WARMEST

77.8 in 1934

COLDEST

67.4 in 1895

WETTEST

6.41" in 1965

DRIEST

0.01" in 1901

SNOWIEST

No snow ever recorded

LEAST SNOWIEST

No snow ever recorded
 

Sunrise/Sunset (Jul - December Denver area)

              JUL                AUG                SEP            OCT               NOV            DEC
______________________________________________________________________________
            sr - ss            sr - ss             sr - ss          sr - ss             sr - ss           sr - ss
 01  0535-0831 | 0559-0813 | 0628-0732 | 0656-0643 | 0629-0457 | 0702-0436  01
 02  0536-0831 | 0600-0812 | 0629-0730 | 0657-0641 | 0630-0456 | 0703-0435  02
 03  0536-0831 | 0601-0811 | 0630-0729 | 0658-0640 | 0631-0455 | 0704-0435  03
 04  0537-0831 | 0601-0810 | 0630-0727 | 0659-0638 | 0632-0454 | 0705-0435  04

 05  0538-0831 | 0602-0809 | 0631-0725 | 0700-0637 | 0633-0453 | 0706-0435  05
 06  0538-0830 | 0603-0808 | 0632-0724 | 0701-0635 | 0634-0452 | 0706-0435  06
 07  0539-0830 | 0604-0807 | 0633-0722 | 0702-0634 | 0635-0451 | 0707-0435  07
 08  0539-0830 | 0605-0805 | 0634-0721 | 0703-0632 | 0637-0450 | 0708-0435  08

 09  0540-0830 | 0606-0804 | 0635-0719 | 0704-0630 | 0638-0449 | 0709-0435  09
 10  0541-0829 | 0607-0803 | 0636-0717 | 0705-0629 | 0639-0448 | 0710-0435  10
 11  0541-0829 | 0608-0802 | 0637-0716 | 0706-0627 | 0640-0447 | 0711-0435  11
 12  0542-0828 | 0609-0800 | 0638-0714 | 0707-0626 | 0641-0446 | 0711-0435  12

 13  0543-0828 | 0610-0759 | 0639-0712 | 0708-0624 | 0642-0445 | 0712-0436  13
 14  0544-0827 | 0611-0758 | 0640-0711 | 0709-0623 | 0643-0444 | 0713-0436  14
 15  0544-0827 | 0612-0757 | 0641-0709 | 0710-0621 | 0644-0444 | 0714-0436  15
 16  0545-0826 | 0613-0755 | 0642-0708 | 0711-0620 | 0646-0443 | 0714-0436  16

 17  0546-0826 | 0614-0754 | 0643-0706 | 0712-0618 | 0647-0442 | 0715-0437  17
 18  0547-0825 | 0615-0752 | 0644-0704 | 0713-0617 | 0648-0442 | 0715-0437  18
 19  0547-0824 | 0616-0751 | 0644-0703 | 0714-0615 | 0649-0441 | 0716-0438  19
 20  0548-0824 | 0616-0750 | 0645-0701 | 0715-0614 | 0650-0440 | 0717-0438  20

 21  0549-0823 | 0617-0748 | 0646-0659 | 0716-0613 | 0651-0440 | 0717-0439  21
 22  0550-0822 | 0618-0747 | 0647-0658 | 0717-0611 | 0652-0439 | 0718-0439  22
 23  0551-0821 | 0619-0745 | 0648-0656 | 0719-0610 | 0653-0439 | 0718-0440  23
 24  0552-0821 | 0620-0744 | 0649-0654 | 0720-0609 | 0654-0438 | 0718-0440  24

 25  0552-0820 | 0621-0742 | 0650-0653 | 0721-0607 | 0656-0438 | 0719-0441  25
 26  0553-0819 | 0622-0741 | 0651-0651 | 0722-0606 | 0657-0437 | 0719-0441  26
 27  0554-0818 | 0623-0739 | 0652-0650 | 0723-0605 | 0658-0437 | 0720-0442  27
 28  0555-0817 | 0624-0738 | 0653-0648 | 0724-0603 | 0659-0436 | 0720-0443  28

 29  0556-0816 | 0625-0736 | 0654-0646 | 0725-0602 | 0700-0436 | 0720-0444  29
 30  0557-0815 | 0626-0735 | 0655-0645 | 0726-0600 | 0701-0436 | 0720-0444  30
 31  0558-0814 | 0627-0733 |                      | 0727-0558 |                      | 0720-0445  31

 

 Rainfall

May 2009 to October 2009

City

May

June

July

Aug Sept

Seasonal Totals

Aurora (Central)

2.99 4.06       7.05
Brighton 2.13 4.02       6.15
Broomfield 1.38 1.69       3.07

Castle Rock 4 NE

2.20 2.09       4.29

Colorado Sprgs Airport

1.17 2.91       4.08
Denver DIA 1.30 4.86       6.16

Denver Downtown

3.15 3.07       6.22

Golden

2.68 3.15       5.83

Fort Collins

2.24 4.85       7.09

Highlands Ranch

3.23 2.28       5.51

Lakewood

3.90 3.90       7.80

Littleton

3.15 3.19       6.34

Parker

1.81 4.33       6.14

Sedalia - Hwy 67

2.40 3.54       5.94

Thornton

2.17 2.64       4.81

Westminster

2.77 3.92       6.69

Wheatridge

2.44 3.19       5.63