July 2008 Climatic Summary

July temperatures were near normal, averaging 1 degree below normal to 1 degree above normal. Spearfish was the warm spot averaging 2.3 degrees above normal. The cold spots were in Colony in northeast Wyoming and at Newell in western South Dakota, where temperatures averaged 1.2 degrees below normal.
Precipitation in July was 10 to 20 percent above normal. The wettest areas were across the southern Black Hills, Bear Lodge Mountains, Fall River County in southwest South Dakota and in Ziebach County in north central South Dakota where precipitation averaged 150 to 200 percent of normal. The driest areas were in south central South Dakota, across Harding and Perkins counties in northwest South Dakota and over southern Campbell County in northeast Wyoming where precipitation was 40 to 60 percent of normal. The wet spot was in Dupree where precipitation was 200 percent of normal, while Bison was the dry spot with only 29 percent of normal precipitation. The precipitation surplus for the month averaged 0.29 inches. This brings the average precipitation surplus through the end of July to 4.72 inches.

 

July storm summary...

On July 2, an isolated severe thunderstorm dropped quarter size hail across southwest Campbell County.

 

On July 5, an isolated severe thunderstorm produced nickel size hail and wind gusts to 68 miles per hour over northeast Campbell County.

 

On July 6, a strong upper level trough moved across the region bringing severe weather to northeast Wyoming, the northern Black Hills and northwest South Dakota. Slow moving severe thunderstorms dropped 2.5 to 5.5 inches of rain from O’Neil Pass to Roubaix Lake, along with nickel size hail. The heavy rains caused flash flooding on Rapid Creek and North Rapid Creek in the area. Over northeast Wyoming hail to the size of nickels and 60 mile per hour winds were reported in Campbell and Weston counties. In northwest South Dakota winds up to 70 miles per hour were reported near Redig and Harding in Harding County.

 

On July 8, severe thunderstorms developed over the northern foothills producing quarter size hail and 60 mile per hour winds from Whitewood to Black Hawk.

 

On July 9, a severe thunderstorm dropped quarter size hail near Lemmon in Perkins County. Late at night another severe thunderstorm dropped quarter size hail and heavy rains near Ideal in Tripp County.

 

On July 15, isolated severe thunderstorms dropped nickel size hail near Oglala in Shannon County and quarter size hail near Saint Francis in Todd County.

 

On July 16, a strong upper level disturbance brought widespread severe weather to northeast Wyoming and western South Dakota. Across northeast Wyoming hail to the size of half dollars and winds to 60 miles per hour were reported. In western South Dakota there were numerous reports of large hail and damaging winds. The strongest winds were at Union Center in Meade County where winds were recorded at 77 miles per hour. The largest hail fell south of Mission in Todd County where golf balls were reported.

 

On July 17, an isolated severe thunderstorm dropped penny size hail in northwest Campbell County.

 

On July 18, a strong upper level disturbance brought widespread severe weather to northeast Wyoming and western South Dakota. During the early morning hours severe thunderstorms dropped penny to quarter size hail over Crook, western Pennington, Custer and Fall River counties. In the afternoon there were numerous reports of large hail and damaging winds. Across western South Dakota the strongest winds were 82 miles per hour near Newell in Butte County, while the largest hail fell in northeast Ziebach County where golf ball size hail was reported. Flash flooding also occurred in Fall River County from Hot Springs to Cascade Falls, where roads and yards were flooded. In northeast Wyoming baseball size hail and winds to 75 miles per hour were reported north of Weston in northeast Campbell County.

 

On July 20, an isolated severe thunderstorm produced 60 mile per hour winds southeast of Hulett in Crook County.

 

On July 21, an isolated severe thunderstorm produced quarter size hail near Deerfield in Pennington County, and golf ball size hail southwest of Hill City in Custer County.

 

On July 22, a strong upper level disturbance brought severe thunderstorms and flash flooding to northeast Wyoming, southwest South Dakota and the southern and central Black Hills. In northeast Wyoming large hail fell in northern Campbell and Crook counties. Hail to the size of baseballs fell 10 miles west of Rockypoint. Over southwest South Dakota winds gusted to 60 miles per hour near Ardmore with baseball size hail reported 9 miles east of Hermosa in Custer County and golf ball size hail just south of Oelrichs in Fall River County. In northeast Wyoming flash flooding occurred in northeast Campbell County where 3 to 6 inches of rain fell from near Rockypoint west to highway 59. The flood washed out several roads and caused one fatality. Flash flooding also occurred in western Fall River County where several secondary roads had water running across them.

  

On July 23, Severe thunderstorms developed over the Black Hills and southwest South Dakota, producing 60 mile per winds near Edgemont in Fall River County and numerous reports of large hail elsewhere in the Black Hills. The largest hail fell on the south side of Rapid City where tennis ball and golf ball size hail were reported. An isolated severe thunderstorm also produced 60 mile per hour winds and penny size hail just south of Eagle Butte in Ziebach County.

 

On July 24, an upper level disturbance combined with a frontal boundary to produce widespread severe thunderstorms across the region. In northeast Wyoming there were numerous reports of large hail, with the largest falling just southwest of Recluse in northern Campbell County, where golf ball size hail was reported. Across western South Dakota there were numerous reports of large hail and damaging winds. The strongest winds were just east of Smithwick in Fall River County where winds were reported at 70 miles per hour. Most areas in western South Dakota reported penny to nickel size hail, though hail to the size of golf balls was reported near Custer, in Custer County, and 15 miles northeast of Cherry Creek in Ziebach County.

 

On July 25, isolated severe thunderstorms dropped penny size hail over far southern Campbell County in northeast Wyoming and nickel size hail west of Ardmore in Fall River County.

 

On July 26, an upper level disturbance moved across the region producing severe thunderstorms across northeast Wyoming, far western and northwestern South Dakota. In northeast Wyoming winds gusted to 75 miles per hour over far northern Campbell County, while nickel size hail fell near Newcastle in Weston County. In northwestern and far western South Dakota there were numerous reports of damaging winds, including a gust to 80 miles per hour 15 miles south of Faith in Meade County. The only reports of hail were nickel size hail in southwestern Custer County and a report of penny size hail in far eastern Haakon County.

 

On July 28, an isolated severe thunderstorm produced a half mile wide tornado 10 miles southwest of Dupree in Ziebach County, which only went through some fields and did not damage any buildings. Another isolated severe thunderstorm produced a small tornado, quarter size hail and winds to 70 miles per hour 12 miles southeast of Hamill in Tripp County.

 

On July 30, an isolated severe thunderstorm produced golf ball size hail in Lemmon in Perkins County. Another isolated severe thunderstorm produced nickel size hail 8 miles north of Hamill in Tripp County.

 LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

95 degrees

10th

89 degrees

26th

97 degrees

26th

Minimum Temperature

45 degrees

12th

43 degrees

13th

38 degrees

12th

 

 

 

 

 

 

 

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly  Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

2.25 inches

 

2.61 inches

 

2.03 inches

 

Snowfall

0.0 inches

 

0.0 inches

 

0.0 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

0.69 inches

6th

0.89 inches

18th

0.93 inches

18th

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

Cedar Butte 1N

29th

98 degrees

Wright 12W

27th

Minimum Temperature

34 degrees

Lodgepole 5SW

13th

32 degrees

Upton 14ENE

12th

 

 

 

 

 

 

 

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

4.84 inches

Milesville 5NE

 

4.16 inches

Rockypoint 1N

 

Minimum Precipitation

0.66 inches

Bison

 

0.48 inches

Wright 12W

 

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

Minimum Snowfall

0.0 inches

 

 

0.0 inches

 

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

2.57 inches

Interior 3NE

19th

1.72 inches

Rockypoint 1N

19th

Maximum Snowfall

0.0 inches

 

 

0.0 inches

 

 

MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

Interior 3NE

07/19/2008

2.57 inches of rainfall

2.44 inches of rainfall

07/17/1999

 

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