...35 degree temperature drop at Rapid City within two hours Monday afternoon...

WEATHER SUMMARY FOR SOUTH DAKOTA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
823 PM CST MON JAN 28 2008

AN ARCTIC COLD FRONT BLASTED THROUGH NORTHWEST SOUTH DAKOTA MONDAY
MORNING...AND ACROSS THE NORTH CENTRAL AND SOUTHWEST DURING THE
AFTERNOON. ONE HOUR TEMPERATURE DROPS OF 20 DEGREES OR MORE OCCURRED
IMMEDIATELY AFTER FRONTAL PASSAGE...ALONG WITH VERY STRONG AND GUSTY
WINDS.

CITY       PRE-FRONTAL TEMPERATURE    ONE HOUR LATER    TIME MST

FAITH            48 DEGREES             29 DEGREES     12 TO 1 PM
PHILIP           57 DEGREES             38 DEGREES      2 TO 3 PM
PIERRE           55 DEGREES             35 DEGREES      3 TO 4 PM
PINE RIDGE       46 DEGREES             25 DEGREES      4 TO 5 PM
RAPID CITY AP    54 DEGREES             30 DEGREES      1 TO 2 PM

NORTHWEST WINDS INCREASED BEHIND THE FRONT AT SPEEDS OF 25 TO 45 MPH
WITH HIGHER GUSTS. AT 437 PM MST THE RAPID CITY AIRPORT MEASURED A
WIND GUST TO 70 MPH. THE PEAK WIND GUST AT BUFFALO DURING THE
AFTERNOON WAS 53 MPH.

HIGH TEMPERATURES IN THE LOW TO MIDDLE 40S OCCURRED DURING THE
MORNING ACROSS THE NORTHWEST...BUT BY LATE IN THE AFTERNOON
TEMPERATURES HAD FALLEN TO NEAR ZERO DEGREES WITH WIND CHILL VALUES
OF 15 BELOW TO 30 BELOW ZERO.

AHEAD OF THE FRONT...WINDS FAVORED A SOUTH OR SOUTHWEST DIRECTION AT
5 TO 15 MPH...ALONG WITH TEMPERATURES THAT WERE WELL ABOVE NORMAL.
HIGHS NEAR THE EASTERN BORDER WERE AROUND 40 DEGREES...PROGRESSIVELY
WARMING INTO THE 40S NEAR THE JAMES RIVER VALLEY...AND FROM THE
UPPER 40S TO THE MIDDLE 50S ACROSS THE CENTRAL AND SOUTHWEST. PHILIP
WAS THE WARMEST IN THE STATE AT 57 DEGREES.

LIGHT RAIN FELL DURING THE AFTERNOON ACROSS THE EAST CENTRAL AND
SOUTHEAST BUT AMOUNTS WERE VERY LIGHT. AFTERNOON SKIES CLEARED OVER
MUCH OF THE CENTRAL TO NEAR THE JAMES RIVER VALLEY BY LATE IN THE
DAY. LOW LEVEL CLOUDS INCREASED BEHIND THE ARCTIC COLD FRONT...ALONG
WITH LIGHT SNOW OR FLURRIES.

AT 8 PM CST THE ARCTIC COLD FRONT EXTENDED FROM SISSETON TO EAST OF
WINNER NEAR GREGORY. SKIES WERE CLEAR TO PARTLY CLOUDY TO THE EAST
OF THE FRONT AND CLOUDY BEHIND IT. TEMPERATURES WERE IN THE 30S TO
THE EAST OF THE FRONT...THE 20S SOUTH CENTRAL THROUGH NORTHEAST...
THE TEENS FROM WEST OF WINNER TO WEST OF ABERDEEN...THE SINGLE
DIGITS ABOVE ZERO MUCH OF THE WESTERN PRAIRIES AND NORTH CENTRAL
...AND BELOW ZERO DEGREES NORTHWEST. EXTREMES WERE FROM 43 DEGREES
AT YANKTON TO 9 DEGREES BELOW ZERO AT BUFFALO. IN THE BLACK HILLS...
CUSTER WAS MOSTLY CLOUDY AND 25 DEGREES. WINDS WERE SOUTHWEST AT 5
TO 15 MPH AHEAD OF THE FRONT...AND FROM THE NORTHWEST AT 25 TO 40
MPH WITH HIGHER GUSTS BEHIND IT. HIGHER WIND GUSTS INCLUDE... 48 MPH
AT MOBRIDGE... 49 MPH AT PIERRE AND 53 MPH AT THE RAPID CITY
AIRPORT. WITH A TEMPERATURE OF 9 BELOW ZERO AND NORTHWEST WINDS OF
33 GUSTING TO 40 MPH...THE WIND CHILL TEMPERATURE AT BUFFALO WAS 39
BELOW ZERO. WIND CHILL TEMPERATURES ACROSS THE WEST WERE IN THE 20S
AND 30S BELOW ZERO.

$$
SHEEHAN



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