Area Forecast Discussion
Issued by NWS Aberdeen, SD

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000
FXUS63 KABR 112045
AFDABR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
345 PM CDT FRI JUL 11 2014

.SHORT TERM...TONIGHT THROUGH SUNDAY NIGHT
FORECAST CHALLENGES INCLUDE PRECIPITATION CHANCES TONIGHT/TOMORROW
AND THEN COOLING TEMP TREND INTO THE WEEKEND.

CURRENTLY...UNDER A PARTLY TO MOSTLY SUNNY SKY...TEMPERATURES ARE
WARMING THROUGH THE 80S AND LOW 90S. WINDS ARE GENERALLY LIGHT
FROM THE NORTH AND A COLD FRONT CONTINUES TO SLOWLY WORK
SOUTHEASTWARD ACROSS THE REGION. SPC MESO-ANALYSIS HIGHLIGHTS AT
LEAST 2000J/KG OF MLCAPE IS AROUND/AHEAD OF THIS FRONTAL BOUNDARY
AMID 35 TO 45 KNOTS OF DEEP LAYER SHEAR...AND VIRTUALLY NO CAPPING
INVERSION /LESS THAN -50J/KG MLCIN/. AT THIS POINT...ONLY TIME
WILL TELL IF STORMS ACTUALLY GET GOING ALONG THIS FRONTAL BOUNDARY
OVER THIS CWA IN THE NEXT 6 TO 9 HOURS.

TONIGHT...A GOOD SYNOPTIC SCALE SET-UP IS MAINTAINED FOR THE
GENERATION OF SHOWERS AND THUNDERSTORMS ACROSS PORTIONS OF THE
NORTHERN PLAINS AND THE NORTHERN HIGH PLAINS...WITH CHANCES FOR
SHOWERS AND THUNDERSTORMS PICKING UP BY LATE TONIGHT AND PERSISTING
THROUGH THE FIRST HALF OF SATURDAY. THEN...PRECIP CHANCES LOOK TO
DRY UP FOR THE REST OF THE WEEKEND. ALSO...925HPA AND 850HPA
THERMAL PROGS MAINTAIN A WARM /NEAR TO ABOVE NORMAL/ AIRMASS
REMAINS IN PLACE THROUGH SATURDAY BEFORE ONE FINAL DRY COLD
FRONTAL PASSAGE PUSHES THROUGH SUNDAY/SUNDAY NIGHT...SIGNALING A
CHANGE TO LOW LEVEL CAA.


.LONG TERM...MONDAY THROUGH FRIDAY
THE MODELS CONTINUE TO SHOW THE BIG COOL DOWN EARLY ON WITH MUCH
BELOW NORMAL TEMPERATURES ON MONDAY AND TUESDAY. COOL CANADIAN
SURFACE HIGH PRESSURE WILL BUILD INTO THE REGION MONDAY AND
TUESDAY AND THEN SLOWLY BUILD EAST THROUGH THE END OF THE WEEK. ON
MONDAY...A STRONG COLD FRONT WILL BE PUSHING ACROSS THE CWA WITH
STRONG CAA ALONG WITH GOOD MIXING OF HIGHER MOMENTUM AIR OFF THE
SURFACE. THUS...EXPECT IT TO BE BREEZY/WINDY ACROSS THE CWA. THERE
SHOULD ALSO BE A STRATUS LAYER ON MONDAY MORNING...MIXING OUT
INTO A HIGHER CU LAYER IN THE AFTERNOON. WITH THIS ANOMALOUSLY COOL
AIR...RECORD LOW MAX TEMPERATURES ARE POSSIBLE ACROSS THE CWA ON
MONDAY. HIGHS WILL BE IN THE 60S OR ALMOST 20 DEGREES BELOW
NORMAL. THE AIR MASS WILL MODIFY INTO TUESDAY WITH MOSTLY SUNNY
SKIES AND DRY CONDITIONS WITH HIGHS AROUND 70 TO 75 DEGREES. THE
WARMING TREND WILL CONTINUE THROUGH FRIDAY AS THE SURFACE HIGH
PRESSURE PUSHES EAST AND WARMER SOUTH WINDS PREVAIL. HIGHS ON
FRIDAY WILL BE BACK ABOVE NORMAL ACROSS THE CWA WITH MID 80S EAST
TO THE LOWER 90S WEST. WITH THE LATEST EC SHOWING LOWER 30S C AT
925MB FOR FRIDAY...TEMPERATURES MAY END UP BEING A LOT WARMER BY
THE TIME FRIDAY IS HERE.


&&

.AVIATION...
18Z TAFS FOR THE KABR...KATY...KPIR AND KMBG TERMINALS

SURFACE HEATING CU WILL CONTINUE TO INCREASE THROUGH THE AFTERNOON
AT ALL LOCATIONS AND WE MAY GET SOME HIGH MVFR/LOW VFR CEILINGS.
OTHERWISE...A JET STREAK WILL DROP INTO THE REGION TONIGHT AND
SATURDAY BRINGING SOME SCATTERED SHOWERS AND STORMS MAINLY AFTER
MIDNIGHT AND SATURDAY MORNING. SHOWERS ARE EXPECTED TO AFFECT ALL
LOCATIONS ALONG WITH SOME VICINITY THUNDER.


&&

.CLIMATOLOGY...AN ANOMALOUSLY COLD LOW PRESSURE SYSTEM WILL MOVE
INTO THE UPPER MIDWEST EARLY NEXT WEEK. THE COMBINATION OF A COOL
CANADIAN AIRMASS ALONG WITH INCREASING CLOUDS COULD RESULT IN A
FEW RECORD LOW HIGH TEMPERATURES ON MONDAY. BELOW IS A LIST OF
LOCATIONS THAT COULD SEE NEAR RECORD COLD READINGS ON MONDAY:

...LOCATION......FORECAST....RECORD LOW HIGH TEMP...
WHEATON MN          63          72 IN 1949
SISSETON            64          70 IN 1993
WATERTOWN           64          61 IN 1962
ABERDEEN            66          65 IN 1962
MOBRIDGE            68          64 IN 1962
PIERRE              70          65 IN 1989


&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
&&

$$
SHORT TERM...DORN
LONG TERM...MOHR
AVIATION...MOHR
CLIMATOLOGY...MOHR

WEATHER.GOV/ABERDEEN




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