July 2011 Climatic Summary


July was a warm month with temperatures averaging 2 to 3 degrees above normal. Gillette 4SE in northeast Wyoming was the warm spot averaging 5.0 degrees above normal. The cold spot was at Mission 14S where temperatures averaged 0.4 degrees below normal.
Precipitation in July was near normal, but varied widely across the region. The wettest areas were across central and south central South Dakota where precipitation averaged 150 to 200 percent of normal. The driest areas were across the plains of northeast Wyoming where precipitation was 10 to 25 percent of normal. The wet spot was at Hermosa 3SW where precipitation was 230 percent of normal. Newcastle in northeast Wyoming was the dry spot with only 6 percent of normal precipitation. The precipitation deficit for the month averaged 0.02 inches.
No snowfall was reported in July.

 
July storm summary...

July 1…A strong thunderstorm produced flash flooding in Belle Fourche. Several streets in town were flooded.

July 2…A weak upper level disturbance produced scattered severe thunderstorms over northeast Wyoming and around the Black Hills. In northeast Wyoming the largest hail reported was the size of golf balls in Upton in Weston County. In western South Dakota the largest hail reported was 1.25 inches in diameter, 10 miles east of Fairburn in Custer County. The strongest winds reported were 60 mph near Hot Springs, Farmingdale in Pennington County, and in Fairburn in Custer County.

July 4…Isolated severe thunderstorms produced 1 inch hail 4 miles south of Cedar Butte in Mellette County and 5 miles southwest of Keyapaha in Tripp County. A wind gust of 75 mph was reported 2 miles southeast of Okreek in Todd County.

July 5… A weak upper level disturbance produced scattered severe thunderstorms over northeast Wyoming and around the Black Hills. In northeast Wyoming the largest hail reported was 2.5 inches in diameter, 10 miles north of Rochelle in Weston County. The strongest wind gust was 60 mph in Wright in Campbell County. In western South Dakota the largest hail reported was 1.5 inches in diameter, 4 miles east of Deerfield in Pennington County.

July 6…Isolated severe thunderstorms produced 70 mph winds, 7 miles southwest of Hermosa in Custer County, and 60 mph winds, 9 miles northeast of Belvidere in Jackson County. Flash flooding was also reported 14 miles east of Zeona in Perkins County where some county roads were under water due to 1.5 to 3.0 inches of rain falling.

July 7…An isolated severe thunderstorm produced hail to the size of golf balls in downtown Custer.

July 11…An isolated severe thunderstorm produced 60 mph winds 10 miles north of Rozet in Campbell County, and 9 miles west of Carlile in Crook County.

July 14…Scattered severe thunderstorms produced large hail and damaging winds across northwest South Dakota. The largest hail reported was 2.0 inches in diameter 10 miles southeast of Ralph in Perkins County, and 12 miles south of Meadow in Perkins County. The strongest wind gusts were 70 mph 11 miles east of Ludlow in Harding County.

July 18… Scattered severe thunderstorms produced large hail, a tornado, and damaging winds across northwest South Dakota. A small tornado touched down 9 miles southwest of Reva in Harding County. The largest hail reported was 1.5 inches in diameter 4 miles south of Reva in Harding County. The strongest wind gust reported was 65 mph 3 miles south of Sorum in Perkins County.

July 19…Isolated severe thunderstorms produced 60 mph winds 10 miles north of New Haven in Crook County, and downed trees 3 miles south of Harding in Harding County.

July 21…Scattered severe thunderstorms produced large hail and damaging winds across west central and south central South Dakota. The largest hail reported was 2.0 inches in diameter 26 miles north of Philip in Haakon County, and 1.5 inches in diameter 10 miles southeast of Creighton in Pennington County. The strongest wind gusts reported were 75 mph in Wall in Pennington County and 70 mph, 9 miles southeast of Creighton in Pennington County.

July 22…Scattered severe thunderstorms produced large hail and damaging winds across northwest and south central South Dakota. Across northwest South Dakota, hail up to 2.75 inches in diameter was reported 9 miles north of Camp Crook and 12 miles north of Buffalo, both in Harding County. Winds gusts of 70 mph were reported 9 miles southwest of Ladner in Harding County. Across southwest South Dakota, 1.75 inch diameter hail was reported in Rosebud. Wind gust up to 60 mph were reported 10 miles south of Cedar Butte in Mellette County.

July 23…An isolated severe thunderstorm produced 1 inch diameter hail in Lodgepole in Perkins County. Another strong thunderstorm produced flash flooding 10 miles northeast of Buffalo in Harding County were water was reported running over several ranch roads.

July 25…A strong upper level disturbance brought widespread severe weather to western South Dakota. The largest hail reported was 2.75 inches in diameter at Pactola Reservoir, with several locations reporting golf ball size hail. The strongest winds reported were 76 mph, 2 miles north of Faith with several locations reporting winds gusts to 70 mph.

July 26…An isolated severe thunderstorm produced 77 mph winds 2 miles east of Okreek and 60 mph winds 6 miles south of Mission, both in Todd County.

July 27…An upper level disturbance brought large hail and damaging winds to northeast Wyoming and western South Dakota. In western South Dakota the largest hail reported was 1.5 inches in diameter, 4 miles south of Rapid City. The strongest winds reported were 88 mph, 20 miles north of Scenic in Pennington County, and 80 mph, 10 miles northeast of Belvidere in Jackson County. Several other locations reported winds in excess of 65 mph. In northeast Wyoming, the largest hail reported was the size of golf balls at Moorcroft in Crook County. The strongest wind gust reported was 68 mph, 7 miles south of Alva in Crook County.

July 28…An upper level disturbance brought scattered severe thunderstorms to the region. Across western South Dakota the largest hail reported was 2.0 inches in diameter 8 miles south of Lodgepole in Perkins county, and 1.75 inches in diameter 4 miles north of Dupree. Several locations reported wind gusts of 60 mph. In northeast Wyoming the largest hail reported was 1.25 inches in diameter 15 miles northeast of Moorcroft in Crook County. Wind gusts of 60 mph were reported 10 miles north of Upton in Crook County.

July 29…A weak upper level disturbance brought scattered severe thunderstorms to western South Dakota. The largest hail reported was 2.0 inches in diameter, 1 mile south of the Belle Fourche Reservoir. The strongest winds reported were 80 mph, 9 miles south of Elm Springs in Meade County.

July 31…A strong upper level disturbance brought large hail and damaging winds to northwest South Dakota. The largest hail reported was 2.0 inches in diameter in downtown Spearfish, with golf ball size hail falling 7 miles south of Bison in Perkins County.  There were numerous reports of winds gusting to 60 mph or more. The strongest gusts were 94 mph 3 miles southeast of Lemmon, 82 mph in Lemmon and 70 mph near Shadehill Reservoir.


 

LOCAL EXTREMES Rapid City Lead Gillette
Temperature Temperature Date Temperature Date Temperature Date
Max. Temp. 103 degrees 31st 94 degrees 31st 104 degrees 19th
Min. Temp. 54 degrees 21st 45 degrees 2nd 45 degrees 21st
Precipitation Rapid City Lead Gillette
Monthly Data Amount Date Amount Date Amount Date
Precipitation 0.66 inches   1.71 inches   0.45 inches  
Snowfall 0.0 inches   0.0 inches   0.0 inches  
Daily Data Amount Date Amount Date Amount Date
Max. Precipitation 0.19 inches 27th 0.67 inches 9th 0.30 inches 12th
Max. Snowfall 0.0 inches   0.0 inches   0.0 inches  
             
REGIONAL EXTREMES Western South Dakota Northeast Wyoming
Temperature Temperature Site Date Temperature Site Date
Max. Temp. 106 degrees Cottnowood 2E 18th 104 degrees Gillette 4SE 19th
Min. Temp. 45 degrees Lead 2nd 45 degrees Gillette 4SE 21st
        45 degrees Dillinger 21st
Precipitation Western South Dakota Northeast Wyoming
Monthly Data Amount Site Date Amount Site Date
Max. Precipitation 6.32 inches Mission 14S   2.82 inches Upton 14 ENE  
Min. Precipitation 0.76 inches Oelrichs   0.12 inches Newcastle  
Max. Snowfall 0.0 inches     0.0 inches    
Min. Snowfall 0.0 inches     0.0 inches    
Daily Data Amount Site Date Amount Site Date
Max. Precipitation 2.71 inches Hermosa 3SSW 26th 1.36 inches Sundance 10th
Max. Snowfall 0.0 inches     0.0 inches    
             
MONTHLY RECORDS WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING
LOCATION DATE NEW RECORD OLD RECORD DATE
    NO RECORDS SET NO RECORDS SET  
         

 

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