Area Forecast Discussion
Issued by NWS Aberdeen, SD

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FXUS63 KABR 092108
AFDABR

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ABERDEEN SD
308 PM CST TUE FEB 9 2016

.SHORT TERM...(THIS EVENING THROUGH THURSDAY NIGHT)
ISSUED AT 307 PM CST TUE FEB 9 2016

MAIN FORECAST CHALLENGE REMAINS SNOW CHCS/AMOUNTS FOR WEDNESDAY.
MEANWHILE LONG WAVE PATTERN CONTINUES TO FEATURE A STRONG WEST CONUS
RIDGE...AND DOWNSTREAM EAST CONUS TROF...IE...POSITIVE PNA PATTERN.
THIS GENERAL PATTERN WILL REMAIN IN PLACE THROUGH THE SHORT TERM.
HOWEVER...WAVES WITHIN THE FAST FLOW ALOFT WILL CONTINUE TO TRAVERSE
THE REGION WITH CONSEQUENT BOUTS OF PCPN. ONE DECENT SYSTEM WITH A
STRONG SFC AND WAVE ALOFT WILL TRACK ACROSS THE CWA ON WEDNESDAY.
WITH RELATIVELY HIGH SNOW TO WATER RATIOS...THE SMALL AMOUNT OF
PREDICTED QPF COULD NET ANYWHERE FROM 1 TO 3 INCHES OF SNOW OVER THE
EASTERN CWA.  WILL ALSO MAINTAIN SOME MENTION OF -ZL BEHIND MAIN
BAND OF SNOW WHERE SOUNDINGS STILL SUPPORT SUCH ACTIVITY.  WEDNESDAY
NIGHT SHOULD BE MOSTLY DRY...BUT ANOTHER SYSTEM COULD BRING SOME
LIGHT SNOW LATE THURSDAY INTO THURSDAY NIGHT.  A RELATIVELY LARGE
TEMPERATURES GRADIENT WILL CONTINUE ACROSS THE AREA AS SURFACE HIGH
PRESSURE BACK DOORS THE EAST.  EASTERLY FLOW OVER THE NEXT COUPLE
DAYS SHOULD ALSO BE ABLE TO TAKE A FEW DEGREES OFF THE ABERDEEN
FORECAST HIGH...WHICH HAS BEEN CONSISTENTLY UNDER FORECAST THE LAST
FEW DAYS WITHIN GOOD MIXING ENVIRONMENTS.

.LONG TERM...(FRIDAY THROUGH TUESDAY)
ISSUED AT 307 PM CST TUE FEB 9 2016

THE PERIOD BEGINS WITH NORTHWESTERLY FLOW ALOFT...WITH A DRY SURFACE
HIGH PRESSURE SINKING SOUTHWARD INTO THE REGION FROM CANADA. THIS
HIGH PRESSURE SHOULD PRODUCE BELOW NORMAL TEMPERATURES FRIDAY AND
FRIDAY NIGHT. ALL MODELS INDICATE THE SURFACE HIGH WILL SHIFT EAST
OF THE REGION ON SATURDAY...WHICH WOULD ALLOW FOR WAA TO DEVELOP.
THE WAA...ALONG WITH A GOOD UPPER LEVEL TROUGH AND SURFACE LOW
PRESSURE SHOULD BRING PCPN INTO THE REGION SATURDAY THROUGH SUNDAY.
THE ECMWF AND GEM SUGGEST BETTER LLM WITH THIS SYSTEM WITH A FEW
INCHES OF SNOW POSSIBLE. THE GFS ALSO SUGGEST ACCUMULATING
SNOWFALL...BUT KEEPS MOST OF THE MOISTURE IN NORTH DAKOTA. AS THE
SYSTEM DEPARTS THE REGION ON SUNDAY...MUCH WARMER TEMPS AT 925 MB
WILL FILTER INTO THE CWA FROM THE WEST. THE SINGLE DIGITS ABOVE
0C...925 MB TEMPS REMAIN OVER THE REGION FROM SUNDAY THROUGH
TUESDAY.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY AFTERNOON)
ISSUED AT 1135 AM CST TUE FEB 9 2016

VFR CONDITIONS THIS AFTERNOON SHOULD BECOME MVFR LATER THIS EVENING
WITH INCREASING LOW LEVEL CLOUDS. A BAND OF LIGHT SNOW WILL BE
POSSIBLE LATE TONIGHT AND THROUGH THE FIRST HALF OF WEDNESDAY. IFR
CONDITIONS ARE LIKELY WITH THE LIGHT SNOW. SOME LIGHT FREEZING DRIZZLE
OR LIGHT FREEZING RAIN MAY ALSO BE POSSIBLE AT PIR AND MBG.

&&

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

$$

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


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