April 2011 Climatic Summary

April temperatures were slightly below normal, averaging 1 to 2 degrees below normal. Gillette 4SE in northeast Wyoming was the warm spot averaging 0.9 degrees above normal. The cold spot was in Winner where temperatures averaged 3.9 degrees below normal.
Precipitation in April was slightly above normal. The wettest areas were across northeast Wyoming and northwest South Dakota where precipitation averaged 120 to 150 percent of normal. The driest areas were across the Southern Black Hills and southwestern South Dakota where precipitation was 60 to 80 percent of normal. The wet spot was at Ludlow 3SSE, where precipitation was 188 percent of normal. Edgemont was the dry spot with only 43 percent of normal precipitation. The precipitation surplus for the month averaged 0.07 inches.
Snowfall was well above normal in April. In the northern Black Hills and Bear Lodge Mountains snowfall ranged from 1 to 2 feet below 5500 feet to 2 to 4 feet above 5500 feet. Across northwest South Dakota snowfall averaged 10 to 20 inches. Elsewhere on the South Dakota plains and across the southern and central Black Hills snowfall averaged 5 to 10 inches. Snowfall across the plains of northeast Wyoming averages 1 to 4 inches.
April storm summary...
April 14…A strong storm system moved across the central Plains dropping heavy snows across portions of western South Dakota. The heaviest snows fell across south central South Dakota where 6 to 12 inches was reported. Across southwest, central and portions of northwest South Dakota 3 to 6 inches of snow fell. Farther west, over northeast Wyoming, the Black Hills and far northwest South Dakota, snowfall was generally 1 to 2 inches. The heaviest snowfall reported was 12 inches at several locations in Todd and eastern Jackson and Bennett counties.
April 19…An upper level storm system brought 3 to 7 inches of snow to northwest South Dakota. The heaviest snowfall reported was 9 inches, 7 miles southeast of Bison in Perkins County.
April 22…A strong upper level disturbance brought strong northwest winds to southwest and south central South Dakota, and 6 to 12 inches of snow to the northern Black Hills and Bear Lodge Mountains. Sustained winds of 30 to 40 mph with gusts in excess of 60 mph were common across southwest and south central South Dakota. The strongest wind gusts reported were 70 mph, 2 miles east of Okreek, and 64 mph, 6 miles west of Parmelee, both in Todd County.
April 26…An upper level disturbance moved across the region and brought 4 to 6 inches of snow to the higher elevations of the northern Black Hills and Bear Lodge Mountains.
April 30…A deep low pressure system brought strong northwest winds of 35 to 45 mph with gusts in excess of 65 mph to western South Dakota and northeast Wyoming. The strongest wind gust across northeast Wyoming was 70 mph, 2 miles southeast of Colony in Crook County. Across western South Dakota winds gusted to 82 mph at Buffalo, 76 mph at Newell, and 75 mph at Faith and Wall.


LOCAL EXTREMES Rapid City Lead Gillette
Temperature Temperature Date Temperature Date Temperature Date
Max. Temp. 74 degrees 2nd 66 degrees 2nd 77 degrees 2nd
Min. Temp. 19 degrees 20th 20 degrees 4th, 20th 17 degrees 4th
Precipitation Rapid City Lead Gillette
Monthly Data Amount Date Amount Date Amount Date
Precipitation 1.54 inches   3.21 inches   2.35 inches  
Snowfall 10.2 inches   23.7 inches   2.6 inches  
Daily Data Amount Date Amount Date Amount Date
Max. Precipitation 0.48 inches 18th 0.58 inches 23rd 0.40 inches 26th
Max. Snowfall 3.9 inches 18th 5.2 inches 23rd 2.0 inches 29th
REGIONAL EXTREMES Western South Dakota Northeast Wyoming
Temperature Temperature Site Date Temperature Site Date
Max. Temp. 84 degrees Oglala 2nd 78 degrees Weston 1E 2nd
Min. Temp. 11 degrees Logdepole 5SW 20th 14 degrees Upton 14ENE 20th
Precipitation Western South Dakota Northeast Wyoming
Monthly Data Amount Site Date Amount Site Date
Max. Precipitation 3.59 inches Ludlow 3SSE   3.26 inches Upton 14ENE  
Min. Precipitation 0.90 inches Edgemont   1.57 inches Newcastle  
Max. Snowfall 23.7 inches Lead   27.2 inches Upton 14ENE  
Min. Snowfall 1.0 inches Edgemont   Trace Upton    
  1.0 inches Hot Springs        
  1.0 inches Spearfish        
Daily Data Amount Site Date Amount Site Date
Max. Precipitation 1.35 inches Mission 15th 0.80 inches Upton 14ENE 27th
Max. Snowfall 12.0 inches Dupree 15th      
  12.0 inches Mission 15th 8.0 inches Upton 14ENE 30th
Dupree 04/15/2011 12.0 inches snowfall 10.5 inches snowfall 04/26/1994

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