Area Forecast Discussion
Issued by NWS Aberdeen, SD

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FXUS63 KABR 210906
AFDABR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
406 AM CDT THU AUG 21 2014

.SHORT TERM...TODAY THROUGH SATURDAY

MCS IS CURRENTLY CROSSING THE BORDER INTO MN WITH DRY CONDITIONS
ACROSS THE REST OF THE CWA. GENERALLY SEEING 30 TO 40 MPH WINDS
WITH THE MCS AS IT ROLLS THROUGH...AND HAVE SEEN THIS FOR THE PAST
SEVERAL HOURS AS FAR BACK WEST AS THE JAMES VALLEY. FAIRLY HEFTY
RAINFALL ACROSS PORTIONS OF THE AREA...AND ACTUALLY ADDING UP TO A
FEW INCHES IN SOME AREAS. WILL BE KEEPING A CLOSE EYE ON POTENTIAL
FOG DEVELOPMENT THROUGH SUNRISE WITH THE VERY MOIST GROUND IN THE
WAKE OF THE MCS. ALSO SEEING CLEARING BEHIND THE PRECIP AND WITH
THE SFC TROUGH MOVING IN WITH LIGHT WINDS...COULD BE SETTING UP
FOR SOME FOG.

TODAY WILL SEE A BREAK IN THE ACTION AS PRECIP WILL DEPART THE CWA
EARLY THIS MORNING AND WE AWAIT ANOTHER STORM SYSTEM FOR FRIDAY.
STILL RATHER WARM TEMPS AT 850 MB OVERHEAD TODAY SO AIR MASS WILL
GENERALLY REMAIN WARM WITH HIGHS IN THE 80S. HUMID CONDITIONS WILL
REMAIN IN PLACE AS WELL...MORE SO FOR EASTERN AREAS.

FRIDAY AND SATURDAY LOOK ACTIVE AS MODELS BRING IN A COUPLE MORE
LOW PRESSURE SYSTEMS. DIFFERENCES NOTED IN REGARDS TO OVERALL
STRENGTH AND TRACK OF THE LOWS...AS WELL AS EVOLUTION OF SHORTWAVE
ENERGY. INTERESTING TO NOTE THAT MODELS ARE PRETTY GENEROUS IN QPF
AMOUNTS AS WELL AS AREAL COVERAGE. OVERALL SEVERE THREAT IS
UNCLEAR...BUT DOES NOT APPEAR TO BE THE BEST SETUP. SEVERE
PARAMETERS NOT ALL LINING UP AT THE RIGHT TIMES AND THERE WILL
LIKELY BE PERIODS OF PROLONGED CLOUD COVER TO SUPPRESS OVERALL
INSTABILITY.

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY

SLOW MOVING LONGWAVE PATTERN CONTINUES TO BRING SEVERAL SYSTEM
ACROSS THE CWA THROUGH THE EXTENDED...WITH TWO DISTINCT
SHORTWAVES...AND A SUBTLER FEATURE INBETWEEN...EMBEDDED WITHIN
SOUTHWEST FLOW ALOFT. TIMING ON THE LAST WAVE IS A BIT TRICKIER AS
THE GFS/ECMWF DIVERGE ON HOW TO HANDLE THE INFLUENCE OF UPPER LEVEL
HIGH PRESSURE OVER THE SOUTHEASTERN CONUS. NEEDLESS TO SAY...LOOKS
LIKE SEVERAL ROUNDS OF STORMS FOR THE AREA. COOLER AIR WILL FILTER
INTO THE REGION BEHIND THE INITIAL WAVE...AND WHILE THE TREND IS
FOR LESS INTENSE COOLER AIR...TEMPERATURES WILL STILL BE WELL
BELOW NORMAL.

&&

.AVIATION...

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

SHOWERS AND THUNDERSTORMS WILL TRACK ACROSS THE NORTH CENTRAL AND
EASTERN PART OF THE CWA THROUGH THE OVERNIGHT HOURS. THERE MAY BE
SOME MVFR VSBYS IN FOG AND MVFR CIGS IN THE WAKE OF THE
PRECIPITATION...POSSIBLY AFFECTING KMBG...KABR AND KATY. THE FOG
AND LOWER CLOUDS WILL LIFT AFTER SUNRISE...LEAVING VFR CONDITIONS
IN PLACE FOR THE REMAINDER OF THE DAY THURSDAY.

&&

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

$$
SHORT TERM...TMT
LONG TERM...CONNELLY
AVIATION...CONNELLY

WEATHER.GOV/ABERDEEN




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