PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE RAPID CITY SD
418 PM MDT TUE SEP 13 2005
...DROUGHT CONDITIONS REMAIN ACROSS WESTERN SOUTH DAKOTA AND
NORTHEASTERN WYOMING...
AS OF SEPTEMBER 6TH...SEVERE DROUGHT CONDITIONS PERSISTED ACROSS
NORTHEASTERN WYOMING AND THE BLACK HILLS WITH MODERATE DROUGHT
CONDITIONS EXTENDING NORTHWARD INTO NORTHWESTERN SOUTH DAKOTA.
ELSEWHERE ON THE PLAINS OF WESTERN SOUTH DAKOTA CONDITIONS WERE
ABNORMALLY DRY...WITH THE EXCEPTION OF SOUTH CENTRAL SOUTH DAKOTA
WHERE MOISTURE CONDITIONS ARE NEAR NORMAL.
SUMMER 2005 TEMPERATURES...
THE SUMMER OF 2005 WAS A WARM ONE WITH AVERAGE TEMPERATURES ACROSS
NORTHEASTERN WYOMING AND WESTERN SOUTH DAKOTA 0.7 DEGREES ABOVE
NORMAL. JUNE WAS 0.4 DEGREES ABOVE NORMAL...AND JULY WAS 2.2 DEGREES
ABOVE NORMAL. AUGUST WAS THE ONLY SUMMER MONTH WITH BELOW NORMAL
TEMPERATURES AT 0.5 DEGREES BELOW NORMAL.
IN COTTONWOOD...THE AVERAGE TEMPERATURE OF 75.5 DEGREES MADE THE
SUMMER OF 2005 THE 3RD WARMEST ON RECORD. IN SPEARFISH THE AVERAGE
TEMPERATURE OF 72.0 WAS THE 4TH WARMEST SUMMER ON RECORD.
AT THE RAPID CITY REGIONAL AIRPORT THE AVERAGE TEMPERATURE FOR THE
SUMMER WAS 71.2 DEGREES...WHICH IS 2.1 DEGREES ABOVE NORMAL.  THIS
TIED FOR THE 23RD WARMEST SUMMER ON RECORD. THE RECORD IS 76.1
DEGREES IN 1936.
AT THE RAPID CITY REGIONAL AIRPORT...THE TEMPERATURE TOPPED 100
DEGREES 11 TIMES...THIS TIES FOR THE 6TH MOST EVER. THE RECORD IS 18
TIMES IN 1936. RECORD HIGH TEMPERATURES WERE SET THREE TIMES IN
JULY...WITH 106 DEGREES ON THE 9TH...109 DEGREES ON THE 16TH AND 105
DEGREES ON THE 19TH.
SUMMER 2005 PRECIPITATION...
DURING THE SUMMER OF 2005...REGION WIDE PRECIPITATION ENDED UP 99
PERCENT OF NORMAL. RAINFALL WAS ABOVE NORMAL IN BOTH JUNE AND AUGUST
WITH A DRY JULY SANDWICHED INBETWEEN. THE WET SPOT WAS OELRICHS
WHERE 10.59 INCHES OF RAIN FELL...WHICH IS 157 PERCENT OF NORMAL.
THE DRY SPOT WAS THE RAPID CITY REGIONAL AIRPORT WHERE ONLY 3.95
INCHES OF RAIN FELL...WHICH IS 77 PERCENT OF NORMAL.
AVERAGE RAINFALL ACROSS NORTHEASTERN WYOMING AND WESTERN SOUTH
DAKOTA IN JUNE WAS 108 PERCENT OF NORMAL. THE WET SPOT
WAS SOUTH CENTRAL SOUTH DAKOTA...WHERE RAINFALL WAS 180 TO 210
PERCENT OF NORMAL. THE DRIEST AREAS EXTENDED FROM COLONY AND
SUNDANCE WYOMING THROUGH THE CENTRAL AND NORTHERN BLACK HILLS TO
INTERIOR AND COTTONWOOD. THROUGH THIS REGION ONLY 40 TO 80 PERCENT
OF NORMAL RAINFALL FELL.
JULY WAS A DRY MONTH WITH AVERAGE RAINFALL ONLY 71 PERCENT OF NORMAL
ACROSS THE REGION.  ACROSS SOUTH CENTRAL SOUTH DAKOTA ONLY 20 TO 40
PERCENT OF NORMAL RAINFALL FELL...WITH ONLY 13 PERCENT OF NORMAL
RAINFALL IN WINNER.  A FEW AREAS SAW ABOVE NORMAL RAINFALL...MAINLY
ACROSS PERKINS...ZIEBACH AND NORTHERN PORTIONS OF MEADE COUNTY.
AUGUST WAS A WET MONTH WITH AVERAGE RAINFALL OF 119 PERCENT OF
NORMAL ACROSS THE REGION. THE WETTEST AREAS WERE IN NORTHEASTERN
WYOMING AND FAR WESTERN SOUTH DAKOTA WHERE RAINFALL WAS 125 TO 225
PERCENT OF NORMAL.
RESERVOIR DATA...
RESERVOIRS AROUND THE REGION REMAINED WELL BELOW CAPACITY AND
CONTINUED A SLOW FALL OVER THE PAST MONTH.  THE TABLE BELOW SHOWS
RESERVOIR DEPTH AS A PERCENT OF CAPACITY AND THE CHANGE IN DEPTH
OVER THE PAST 30 DAYS.
RESERVOIR            PERCENT CAPACITY    PAST 30 DAY CHANGE
ANGOSTURA                  45.8          DOWN  3  FEET
BELLE FOURCHE              13.1          DOWN  10 FEET
DEERFIELD                  84.4          DOWN  1  FOOT
KEYHOLE                    40.3          DOWN  1  FOOT
PACTOLA                    66.1          DOWN  2  FEET
SHADEHILL                  69.1          DOWN  1  FOOT
...OUTLOOK FOR SEPTEMBER THROUGH JANUARY
DROUGHT CONDITIONS ARE EXPECTED TO CONTINUE ACROSS WESTERN SOUTH
DAKOTA AND NORTHEASTERN WYOMING THROUGH JANUARY. 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
AUGUST THROUGH JANUARY WILL HAVE TO BE 175 TO 250 PERCENT OF NORMAL
ACROSS NORTHEASTERN WYOMING AND THE BLACK HILLS TO END THE CURRENT
DROUGHT CONDITIONS THERE. THE NATIONAL CLIMATIC DATA CENTER IS
CURRENTLY FORECASTING LESS THAN A 10 PERCENT CHANCE OF THIS
OCCURRING. THE CURRENT LONG RANGE FORECASTS INDICATE EQUAL CHANCES
OF NEAR NORMAL..ABOVE NORMAL...OR BELOW NORMAL PRECIPITATION FOR
SEPTEMBER THROUGH JANUARY.

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