July 2009 Climatic Summary

July was a cool month with temperatures averaging 2 to 4 degrees above normal. Gillette 4SE in northeast Wyoming was the warm spot averaging 1.1 degrees above normal. The cold spot was in Winner where temperatures averaged 6.1 degrees below normal.
Precipitation in July averaged 10 to 30 percent above normal. The wettest areas were across central South Dakota where precipitation averaged 175 to 225 percent of normal. The driest areas were across northwestern and southwestern South Dakota where precipitation was 60 to 80 percent of normal. The wet spot was at Colony in northeast Wyoming, where precipitation was 320 percent of normal. Interior was the dry spot with only 45 percent of normal precipitation. The precipitation surplus for the month averaged 0.39 inches. No snowfall was reported during the month of July.

July storm summary...

On July 1…scattered severe thunderstorms produced quarter size hail and 60 mph winds 12 miles north of Belle Fourche in Butte County. Another storm produced Ping Pong ball size hail and 70 mph winds in Custer. Another storm produced quarter size hail 4 miles west of Edgemont in Fall River County.

On July 2…an upper level disturbance produced severe thunderstorms across northeast Wyoming and far western South Dakota. There were numerous reports of large hail and winds in excess of 60 mph. The largest hail was half dollar size and fell 14 miles southwest of Provo in Fall River County. The strongest wind gust of 70 mph was reported 8 miles northwest of Rockypoint in Campbell County in northeast Wyoming. Heavy rains also produce flooding of small creeks and streams in southwest Fall River County.

On July 3…thunderstorms with heavy rain produced flooding of small streams and creeks, and pushed water over some rural roads in central Fall River County, southern Perkins County and over northwest Ziebach County.
 
On July 6…an isolated severe thunderstorm produced 60 mph winds 13 miles north of Gillette in Campbell County in northeast Wyoming.
 
On July 8…a powerful upper level disturbance produced widespread severe weather across the region. Tornadoes touched down in southwest Pennington County, southeast Jackson County and across Todd County. There were numerous reports of large hail. The largest hail was reported in Lemmon and Mission, where baseball size hail fell. There were numerous reports of wind gusts of 60 to 70 mph, with the strongest gust estimated at 100 mph, reported 9 miles north of Vetal in Bennett County, where numerous large trees were blown down.
 
On July 9…an upper level disturbance brought severe weather to northeast Wyoming and southwest South Dakota. There were numerous reports of large hail, and isolated reports of damaging winds. The largest hail reported fell in Wright, in southern Campbell County and 10 miles southwest of Upton in Weston County, where golf ball size hail fell. Wind gusts to 70 mph were reported in Osage, in Weston County.
 
On July 10…an isolated severe thunderstorm produced golf ball size hail 4 miles southwest of Slim Butte in Shannon County.
 
On July 11…early morning isolated severe thunderstorms produced quarter size hail 5 miles northwest of Fairburn in Custer County, 4 miles southeast of Hisle and 5 miles southeast of Martin in Bennett County and 1 mile southwest of Interior in Jackson County.
 
On July 13…a powerful upper level disturbance produced widespread severe weather across the region. An F2 tornado touched down 7 miles southwest of Aladdin in Crook County. Tornadoes also touched down 4 miles east of St. Francis and 2 miles southwest of Parmelee in Todd County. There were numerous reports of large hail. The largest hail was reported in Rosebud in Todd County and 2 miles northwest of Hulett in Crook County, where softball size hail fell. There were numerous reports of wind gusts of 60 to 70 mph, with the strongest winds reported being a gust to 86 mph, 5 miles northeast of Porcupine in Shannon County.
 
On July 16…an isolated severe thunderstorm produced 60 mph winds 7 miles north of Ideal in Tripp County.
 
On July 19…an isolated strong thunderstorm produced nickel size hail at Castle Rock in Butte County.
 
On July 27…an isolated severe thunderstorm produced 69 mph winds at the Rapid City Airport and 65 mph winds at Scenic in Pennington County.


LOCAL EXTREMES 

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

95 degrees

19th

87 degrees

19th

96 degrees

19th

Minimum Temperature

46 degrees

31st

42 degrees

30th

42 degrees

30th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

1.78 inches

 

3.33 inches

 

1.91 inches

 

Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.61 inches

13th

1.16 inches

14th

0.52 inches

7th

Maximum Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 


REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

102 degrees

Bear Ridge

26th

99 degrees

Upton

19th

Minimum Temperature

37 degrees

Pactola Dam

29th, 30th

33 degrees

Upton 14 ENE

29th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

6.57 inches

Lemmon

 

2.97 inches

Sundance

 

Minimum Precipitation

1.07 inches

Interior 3 NE

 

1.06 inches

Devils Tower

 

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

Minimum Snowfall

0.0 inches

 

 

0.0 inches

 

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

3.92 inches

Lemmon

13th

1.29 inches

Sundance

12th

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

 
 MONTHLY RECORDS

 

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Lemmon

07/13/2009

3.92 inches rainfall

3.52 inches rainfall

07/17/1969

Maurine 12SW

07/04/2009

2.58 inches rainfall

2.08 inches rainfall

07/21/1983

  

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