Area Forecast Discussion
Issued by NWS Aberdeen, SD

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000
FXUS63 KABR 180915
AFDABR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
415 AM CDT FRI APR 18 2014

.SHORT TERM...TODAY THROUGH SUNDAY
FIRE WEATHER WILL BE A CONCERN THIS AFTERNOON. PLEASE SEE THE FIRE
WEATHER DICUSSION FOR MORE DETAILS.

A STRENGTHENING SURFACE LOW PRESSURE SYSTEM OVER WESTERN SOUTH
DAKOTA WILL INCREASE THE PRESSURE GRADIENT ACROSS THE EASTERN
DAKOTAS THIS AFTERNOON. GFS LAMP GUIDANCE PLUS OTHER HI-RES MODELS
ARE SHOWING WINDS INCREASING TO WIND ADVISORY CRITERIA BY 18Z FOR
MOST LOCATIONS EAST OF HIGHWAY 83. WINDS SHOULD BEGIN TO DIMINISH
SHORTLY AFTER 0Z DUE TO THE SURFACE LOW BETWEEN THE JAMES AND
MISSOURI RIVER. HOWEVER INCREASING SOUTHWESTERLY WINDS IN THE
LOWER LEVELS MAY PROMOTE GUSTY DOWNSLOPE WINDS ALONG THE LEE SIDE
OF THE SISSETON HILLS THROUGH THE NIGHT.

A STRONG COLD FRONT OVER THE WESTERN DAKOTAS LATER THIS EVENING
WILL UNDERGO FRONTOLYIS AS IT CROSSES THIS CWA TONIGHT. WITH
LIMITED AVAILABLE MOISTURE EXCEPT ALONG THE COLD FRONT...AND WEAK
FORCING WILL MAINTAIN SCHC POPS TO LOW END CHC POPS FOR MOST
LOCATIONS TONIGHT. NORTHEASTERN SOUTH DAKOTA AND WESTERN MINNESOTA
STILL HAS THE BEST POTENTIAL OF SEEING SHOWERS.

WITH LOW LEVEL TEMPERATURES REMAINING AOA CLIMO ON SATURDAY AND
PLENTIFUL SUNSHINE...HIGHS SHOULD WARM INTO THE 60S. WARMER
TEMPERATURES ARE EXPECTED ON SUNDAY AHEAD OF OUR NEXT FRONTAL
PASSAGE. HIGHS SHOULD WARM INTO THE UPPER 60S TO THE MID 70S.

.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY

A SOMEWHAT PROGRESSIVE MID LEVEL FLOW PATTERN IS EXPECTED TO
CONTINUE ACROSS THE CONUS...BUT PERHAPS SLOW UP A BIT AND AMPLIFY
TOWARD THE END OF THE PERIOD. A FAIRLY HIGH AMPLITUDE TROF IS
EXPECTED TO MOVE ASHORE THE WEST COAST ABOUT TUESDAY AND THEN
EJECT INTO THE CENTRAL CONUS WEDNESDAY/THURSDAY TIME FRAME. THE
EJECTION PROCESS/EVOLUTION/SPEED IS A BIT DIFFERENT BETWEEN THE MODELS SO
FORECAST DETAILS WILL BE UP FOR GRABS. HOWEVER...ALL MODELS POINT
TOWARD DECENT CHANCES FOR RAIN FROM WEDNESDAY THROUGH
THURSDAY...PERHAPS EVEN SOME THUNDERSTORMS...ALTHOUGH THAT SAID
MIXED LAYER CAPES WERE NOT TOO IMPRESSIVE SO AT THIS POINT SVR
WEATHER CHANCES LOOK PRETTY MARGINAL. TEMPERATURES SHOULD AVERAGE
OUT NEAR TO EVEN ABOVE NORMAL DURING THE PERIOD.

&&

.AVIATION...
06Z TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS

VFR CONDITIONS ARE EXPECTED DURING THE NEXT 24 HOURS...ALONG WITH
INCREASING SOUTHERLY BREEZES LATE TONIGHT THROUGH THE DAY ON
FRIDAY.

&&

.FIRE WEATHER...
STRONG SOUTHEASTERLY WINDS OF 20 TO 30 MPH WITH HIGHER GUSTS CAN
BE EXPECTED FOR ALL LOCATIONS EAST OF THE MISSOURI RIVER VALLEY
THIS AFTERNOON. WIND GUSTS MAY EXCEED 45 MPH AT TIMES FOR THE
JAMES RIVER VALLEY AND THE GLACIAL LAKES AREA. THE COMBINATION OF
A DRY AIRMASS AND WARM TEMPERATURES IN THE 60S AND 70S WILL
PRODUCE MINIMUM RH VALUES IN THE 20 TO 30 PERCENT RANGE. HOWEVER
WILL HOLD OFF ON ISSUING FIRE WEATHER HEADLINES FOR TWO REASONS.
THE FIRST REASON IS BECAUSE THE STRONGEST WINDS WILL OCCUR WHERE
THE MINIMUM RH VALUES WILL BE THE HIGHEST...OR BETWEEN 40 TO 50
PERCENT. SECONDLY...THE LOWEST RH VALUES WILL OCCUR WHERE WINDS
SHOULD DECREASE THROUGH THIS AFTERNOON.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...WIND ADVISORY FROM NOON TODAY TO 8 PM CDT THIS EVENING FOR BROWN-
     BUFFALO-CLARK-CODINGTON-DAY-EDMUNDS-FAULK-GRANT-HAMLIN-HAND-
     HYDE-MARSHALL-MCPHERSON-ROBERTS-SPINK.

MN...NONE.
&&

$$
SHORT TERM...SD
LONG TERM...TDK
AVIATION...TDK

WEATHER.GOV/ABERDEEN




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