PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
418 PM MDT MON MAY 17 2006

…DROUGHT CONDITIONS REMAIN ACROSS WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING…

AS OF MAY 16th…MODERATE DROUGHT CONDITIONS PERSISTED ACROSS NORTHEASTERN WYOMING…AND ACROSS PERKINS…ZIEBACH…HAAKON AND EASTERN MEADE COUNTIES IN WESTERN SOUTH DAKOTA. ABNORMALLY DRY CONDITIONS PERSISTED ACROSS THE REST OF WESTERN SOUTH DAKOTA WITH THE EXCEPTION OF SOUTH CENTRAL AND EXTREME NORTHWEST SOUTH DAKOTA WHERE MOISTURE CONDITIONS WERE NEAR NORMAL.

…WINTER 2005-2006 PRECIPITATION…
DURING THE 2005-2006 WINTER…REGION WIDE PRECIPITATION RANGED FROM 59 PERCENT OF NORMAL IN RAPID CITY TO 143 PERCENT OF NORMAL IN LEAD. GENERALLY, NORTHEAST WYOMING WAS VERY DRY. MOST STATIONS REPORTED ONLY 4 TO 5 INCHES OF PRECIPITATION…
WHICH IS ABOUT AN INCH LESS THAN NORMAL. APRIL MOISTURE BROUGHT NORTHWEST SOUTH DAKOTA AND THE NORTHERN BLACK HILLS TO READINGS SLIGHTLY ABOVE NORMAL WHILE MARCH SNOWSTORMS HELPED THE SOUTHWEST CORNER AND THE SOUTHERN BLACK HILLS OF SOUTH DAKOTA. WITHOUT THESE EVENTS…THE AREA WOULD HAVE BEEN EXTREMELY DRY. WEST-CENTRAL SOUTH DAKOTA MISSED MOST OF THESE EVENTS…RESULTING IN DRIER THAN NORMAL CONDITIONS THIS WINTER.

…RESERVOIR DATA…
RESERVOIRS AROUND THE REGION REMAINED WELL BELOW CAPACITY. THE TABLE BELOW SHOWS RESERVOIR PERCENT OF NORMAL CAPACITY AS CALCULATED BY THE BUREAU OF RECLAMATION.

RESERVOIR                         PERCENT OF NORMAL
…………………………………………………
ANGOSTURA                                 50%
BELLE FOURCHE                        61%
DEERFIELD                                   79%
KEYHOLE                                       39%
PACTOLA                                       74%
SHADEHILL                                   76%

…OUTLOOK FOR MAY THROUGH SEPTEMBER…
DROUGHT CONDITIONS ARE EXPECTED TO CONTINUE ACROSS WESTERN SOUTH DAKOTA AND NORTHEASTERN WYOMING THROUGH SEPTEMBER. IF NORMAL OR ABOVE NORMAL RAINFALL OCCURS DURING THIS PERIOD SOME IMPROVEMENT IN DROUGHT CONDITIONS CAN BE EXPECTED…ESPECIALLY ACROSS NORTHEASTERN WYOMING AND FAR WESTERN SOUTH DAKOTA.

ACCORDING TO THE NATIONAL CLIMATIC DATA CENTER…RAINFALL FROM MAY THROUGH SEPTEMBER WILL HAVE TO BE 125 TO 150 PERCENT OF NORMAL ACROSS NORTHEASTERN WYOMING TO BREAK THE DROUGHT OVER THE NEXT 4 MONTHS. THE NATIONAL CLIMATIC DATA CENTER IS CURRENTLY FORECASTING LESS THAN A 15 PERCENT CHANCE OF THIS OCCURRING. 
 
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