Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 210845
AFDFGF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
345 AM CDT MON APR 21 2014

.SHORT TERM...(TODAY THROUGH TUESDAY)
ISSUED AT 340 AM CDT MON APR 21 2014

FORECAST CHALLENGES CONCERN TEMPERATURES AND UPCOMING PCPN
CHANCES. BY MIDWEEK MODELS CONTINUE TO SHOW DIFFERENCES WITH UPPER
LOW TRACK AND WHERE ASSOCIATED MAIN RAIN BAND WILL SET UP. HELD
PRETTY CLOSE TO PERSISTENCE IN LATER PERIODS.

FOR TODAY COLD FRONT SHOULD BE THROUGH FA BY MORNING. COOLER
COLUMN IN PLACE WITH COOLEST AIR ALOFT ACROSS NE FA THIS
AFTERNOON. WRAP AROUND/COLD ADVECTION STRATUS PROGGED BY MODELS
TO DROP THROUGH FA THIS MORNING. MAIN UNCERTAINTY WILL BE HOW MUCH
CLOUD COVER WILL BE ACROSS THE FA THIS AFTERNOON WHICH WILL HAVE
IMPACT ON TEMPERATURES. WILL NO DOUBT BE QUITE A BIT COOLER TODAY
BUT JUST HOW MUCH IS THE QUESTION. MAINTAINED MAXIMUM TEMPERATURES CLOSE
TO INHERITED INHERITED VALUES.

HIGH PRESSURE SETTLES IN OVERNIGHT. DIMINISHING WIND AND MAINLY
SKC SHOULD ALLOW TEMPERATURES TO DROP OFF CLOSE TO FREEZING.

TUESDAY WILL SEE SOME THERMAL RECOVERY WITH INCREASED MIXING AND
WARM ADVECTION.

SURFACE LOW ASSOCIATED WITH APPROACHING UPPER LOW WILL PROPAGATE
TO THE WESTERN DAKOTAS BY MORNING. PRECIPITABLE H2O VALUES
INCREASE TO AROUND AN INCH AND AS LOW LEVEL JET SHIFTS EAST SHOULD
SEE AREAS OF RAIN DEVELOPMENT...MAINLY AFT MIDNIGHT.

.LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 340 AM CDT MON APR 21 2014

AS UPPER LOW WOBBLES INTO THE FA LOOKS LIKE A RESPECTABLE RAIN
EVENT SETTING UP WEDNESDAY/WEDNESDAY NIGHT. MODELS DIFFER ON UPPER LOW
TRACK AND THIS WILL HAVE AN IMPACT ON WHERE MAIN RAIN BAND SETS UP
BUT OVERALL FOR NOW LIKELY POPS LOOK GOOD SPREADING FROM WEST TO
EAST DURING THE PERIOD. AS MODELS COME TOGETHER LATER SHIFTS WILL
BE ABLE TO INCREASE POPS ACCORDINGLY. NOT TOO IMPRESSED WITH
THUNDER POTENTIAL UNTIL LATER WEDNESDAY ACROSS THE SOUTH HALF OF
THE FA.

THURSDAY TO SUNDAY NIGHT...MODELS CONTINUE TO BE IN RELATIVELY FAIR
AGREEMENT WITH EVOLUTION OF CUTOFF 500MB LOW PRESSURE SYSTEM TO
TRAVERSE THE NORTHERN PLAINS MIDWEEK. MOST OF THURSDAY WILL BE A
TRANSITION FROM THE DRY SLOT ACROSS E ND AND THE END OF THE WAA PCPN
BAND IN NW MN TO THE DEFORMATION ZONE FORMING AND DRAGGING A RAIN
SNOW MIX ACROSS THE NORTHERN HALF OF THE FA THURSDAY NIGHT. SOME
LIGHT SNOW OR RAIN SHOWERS MAY CONTINUE EARLY FRIDAY WITH NORTH
WINDS. SFC HIGH ON SATURDAY WILL BRING A COOL END OF APRIL WEEKEND.
TEMPS FOR THE PERIOD WILL BE BELOW END OF APRIL NORMALS...40S AND
50S FOR HIGHS WITH LOWS IN THE 20S AND 30S.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z MONDAY NIGHT)
ISSUED AT 1120 PM CDT SUN APR 20 2014

WIND SHIFT WILL REACH BJI WITHIN NEXT TWO HOURS. WILL NOT
INTRODUCE PRECIP INTO TVF OR BJI AS THE SHOWERS ARE BEGINNING TO
DRY UP AS THEY ENTER MN. LIGHT WESTERLIES WITH WINDS SHIFTING TO
THE NORTHWEST TOMORROW MORNING...AND BECOMING RATHER BREEZY BY MID
MORNING. DID KEEP SOME STRATOCU IN BUT RAISED CIGS TO AROUND 5K FT
(FROM 3K FT). NOT OVERLY CONFIDENT THIS WILL BE A CIG ANYWAY...SO
BOTTOM LINE IS VFR CONDS AND WINDY ON MONDAY.


&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...NONE.
MN...NONE.
&&

$$

SHORT TERM...VOELKER
LONG TERM...JK/VOELKER
AVIATION...SPEICHER






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