April 2010 Climatic Summary

  
April temperatures were mild, averaging 1 to 3 degrees above normal. Spearfish was the warm spot averaging 4.1 degrees above normal. The cold spot was at Wright 12W in northeast Wyoming, where temperatures averaged 1.0 degrees below normal.
April was a wet month with precipitation averaging 30 to 50 percent above normal. The wettest area was across southwestern South Dakota where precipitation averaged 200 to 250 percent of normal. The driest area was across northwestern South Dakota where precipitation was 70 to 90 percent of normal. The wet spot was in Oral, where precipitation was 255 percent of normal. Colony in northeast Wyoming was the dry spot with only 56 percent of normal precipitation. The precipitation surplus for the month averaged 0.77 inches.
Snowfall in April was slightly below normal. Across the northern Black Hills and Bear Lodge Mountains 18 to 30 inches of snow fell. Elsewhere, the central and southern Black Hills saw 12 to 18 inches of snow, with 6 to 12 inches on the plains northeast Wyoming and across much of the plains of western South Dakota. Little or no snow fell across southwest and south central South Dakota.

April storm summary...

On April 1 and 2…A strong upper level storm system brought snow to northeast Wyoming, the Black Hills and northwest South Dakota. Across the northern Black Hills and Bear Lodge Mountains 12 to 18 inches of snow fell, with 6 to 12 inches across the plains of Campbell and Crook counties in northeast Wyoming. The northern and eastern foothills, the central Black Hills and northwest South Dakota saw 4 to 8 inches of snow. Little or no snow fell elsewhere.
 
On April 6…An upper level disturbance brought 3 to 6 inches of snow to Fall River County and western Custer County in southwest South Dakota, and to Weston County in northeast Wyoming,
 
On April 9…A strong pressure gradient developed over western South Dakota and produced northwest winds of 35 to 45 mph with gusts to 60 mph on the plains of western South Dakota, mainly north of I-90. The strongest wind gust reported was 68 mph, 4 miles northwest of Rapid City.
 
On April 13…An upper level disturbance brought the first severe weather event of the season to the western South Dakota plains. Severe thunderstorm wind gusts in excess of 60 mph were common across central and south central South Dakota. The strongest wind gust reported was 70 mph, 1 mile north of Hereford in Meade County.
 
On April 23 and 24…A deep upper level low pressure system brought heavy rains to western South Dakota and northeast Wyoming. In the northern Black Hills and Bear Lodge Mountains 2.5 to 3.5 inches of rain fell, with 4 to 8 inches of snow falling above 6000 feet. In the southern and central Black Hills, and on the southern and central plains of western South Dakota 0.75 to 1.50 inches of rain fell, while northwest South Dakota and the plains of northeast Wyoming generally saw 0.25 to 0.75 inches of rain.

LOCAL EXTREMES

Temperature Data

Rapid City

 

Lead

 

Gillette

 

 

Temperature

Date

Temperature

Date

Temperature 

Date

Maximum Temperature

79 degrees

28th

66 degrees

28th

72 degrees

19th

Minimum Temperature

22 degrees

27th

19 degrees

7th

17 degrees

4th

Precipitation Data

Rapid City

 

Lead

 

Gillette

 

Monthly Data

Amount

Data

Amount

Date

Amount

Date

Precipitation

3.03 inches

 

5.19 inches

 

2.43 inches

 

Snowfall

2.1 inches

 

23.3 inches

 

9.6 inches

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

1.09 inches

23rd

1.56 inches

2nd

0.56 inches

1st

Maximum Snowfall

1.3 inches

2nd

15.6 inches

2nd

6.0 inches

2nd

 
REGIONAL EXTREMES

Temperature Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

 

Temperature

Site

Date

Temperature

Site

Date

Maximum Temperature

83 degrees

Winner

13th

75 degrees

Upton 

12th

Minimum Temperature

15 degrees

Pactola Dam

3rd

10 degrees

Wright 12W

4th

Precipitation Data

 

Western South Dakota

 

 

Northeastern Wyoming

 

Monthly Data

Amount

Site

Date

Amount

Site

Date

Maximum Precipitation

6.05 inches

Deadwood 2NE

 

3.46 inches

Devils Tower

 

Minimum Precipitation

1.35 inches

Lodgepole 5SW

 

0.89 inches

Colony

 

Maximum Snowfall

23.3 inches

Lead

 

22.2 inches

Wright 12W

 

Minimum Snowfall

0.0 inches

Several Locations

 

2.0 inches 

Newcastle

 

 

 

 

 

 

 

 

Daily Data

 

 

 

 

 

 

Maximum Precipitation

2.47 inches

Mission 14S

24th

1.25 inches

Weston 1E

2nd

Maximum Snowfall

16.1 inches

Deadwood 2NE

2nd

7.4 inches

Wright 12W

1st


MONTHLY RECORDS

LOCATION

DATE

NEW RECORD

OLD RECORD

DATE

 

 

NO RECORDS SET

 

 

 

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