Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 040243
AFDFGF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
943 PM CDT SUN MAY 3 2015

.UPDATE...
ISSUED AT 939 PM CDT SUN MAY 3 2015

NO UPDATE NEEDED AT THIS TIME.

UPDATE ISSUED AT 648 PM CDT SUN MAY 3 2015

WILL GO AHEAD AND ISSUE A FROST ADVISORY FOR THE DEVILS LAKE BASIN
TONIGHT. MID 20S DEWPOINTS AND IDEAL RADIATIONAL COOLING OVERNIGHT
WITH SFC HIGH PRESSURE AND CLEAR SKIES...ALLOWING TEMPS TO FALL
EFFICIENTLY IN TO THE LOW TO MID 30S. SOME SFC DEW POINT RECOVERY
WILL OCCUR WITH ATMOSPHERE DECOUPLING...ALONG AND EAST OF THE
VALLEY A BIT MORE WIND AND POSSIBLE MID CLOUD TO KEEP TEMPS A BIT
HIGHER.

&&

.SHORT TERM...(THIS EVENING THROUGH MONDAY NIGHT)
ISSUED AT 300 PM CDT SUN MAY 3 2015

MAIN FORECAST CHALLENGES WILL BE TEMPERATURES AND INCREASING PCPN
CHANCES TOWARDS MIDWEEK. MODELS OVERALL IN FAIR AGREEMENT WITH
SOME PCPN PLACEMENT DIFFERENCES MIDWEEK WHICH IS NO BIG SURPRISE.
WILL CONTINUE WITH PERSISTENCE IN LATER PERIODS AS A RESULT.

TONIGHT HIGH PRESSURE WILL BUILD INTO THE FA FOR DIMINISHING
WINDS. COULD STILL SEE SOME MID/UPPER LEVEL CLOUDS OVER THE SE FA
FOR A TIME THIS EVENING HOWEVER BY LATE EVENING GENERALLY SKC
EXPECTED ACROSS THE REGION. WITH COOLER COLUMN ACROSS THE FA
SHOULD SEE MORE CONSISTENT MINIMUMS ACROSS THE FA AROUND 40 OR SO.

HIGH PRESSURE REMAINS OVER THE FA MONDAY FOR SUNSHINE...LIGHT
WINDS AND SEASONAL TEMPERATURES.

MODEST RETURN FLOW SETS UP MONDAY NIGHT HOWEVER FAIRLY DRY/COOL
COLUMN IN PLACE SO MINIMUM TEMPERATURES AGAIN WILL BE CLOSE TO
SEASONAL AVERAGES.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 300 PM CDT SUN MAY 3 2015

UPPER LOW WILL BEGIN TO LIFT NE FROM 4 CORNERS AREA TUESDAY. AS IT
DOES SURFACE LOW PRESSURE ORGANIZES OVER THE CENTRAL/SOUTHERN HIGH
PLAINS WITH E-W BOUNDARY SETTING UP ACROSS THE PLAINS ON NORTHERN
FRINGE OF NORTHWARD ADVANCING MOISTURE FLUX. AT THIS POINT ANY
CONVECTION ASSOCIATED WITH BOUNDARY WILL REMAIN SOUTH OF THE FA.

TUESDAY NIGHT AND WEDNESDAY BOUNDARY AND DEEPER LAYERED RH WILL
CONTINUE TO LIFT NORTHWARD AS UPPER TROUGH LIFTS NE. EXPECT BAND
OF PCPN TO LIFT NORTHWARD OVERNIGHT TUESDAY NIGHT INTO WEDNESDAY.
WITH MODEL DIFFERENCES TOO TOUGH AT THIS TIME TO PIN POINT POPS SO
INCREASED POPS FROM S-N TUESDAY NIGHT AND KEPT GENERAL LIKELY POPS
THROUGH WEDNESDAY. T POTENTIAL NOT OVERLY IMPRESSIVE TIL POSSIBLY
LATER WEDNESDAY. TEMPERATURES WILL HINGE ON CLOUD COVER HOWEVER
COLUMN FAIRLY MILD SO GENERAL ABOVE AVERAGE TEMPERATURES EXPECTED.

.LONG TERM...(WEDNESDAY NIGHT THROUGH SUNDAY)
ACTIVE AND WET PATTERN EXPECTED THROUGHOUT THE PERIOD WITH DEEP H5
TROF DIGGING INTO THE SOUTHWEST CONUS THROUGH SATURDAY AND THEN
SLOWLY LIFTING THROUGH THE INTERMOUNTAIN WEST INTO THE FOLLOWING
WEEK. THIS KEEP AN UNSTABLE SOUTHWESTERLY UPPER FLOW PATTERN OVER
THE FA THROUGH THE EXTENDED PERIOD... AND ALLOWS FOR A DEEPENING
SOUTHERLY LOW LEVEL MOISTURE FLOW TO DEVELOP ACROSS THE SOUTHERN AND
CENTRAL PLAINS... FEEDING STORM SYSTEMS INTO THE NORTHERN PLAINS.
GFS AND ECMWF CONTINUE TO ALTERNATE PHASING OF SHORTWAVE IMPULSES
LIFTING THROUGH THE PATTERN THOUGH CONSENSUS HAS DEEP CONVECTION
THREAT FROM WEDNESDAY MORNING THROUGH THURSDAY AFTERNOON... WITH A
MORE STABLE PRECIP /WRAPAROUND/ BAND FROM LATE THURSDAY INTO FRIDAY.
CURRENT MODELS DEPICT A BREAK IN PRECIP FROM MID FRI INTO SAT...
WITH A SECOND LOW PRESSURE CENTER TRACKING THROUGH THE AREA FOR
SUNDAY AND MONDAY. SO EXPECT PERIODS OF RAIN AND SUN WITH
TEMPERATURES STEADILY COOLING INTO THE WEEKEND.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z MONDAY EVENING)
ISSUED AT 648 PM CDT SUN MAY 3 2015

GUSTS BEGINNING TO WANE ACROSS THE AREA AND WILL MAINTAIN THE SKC
AND LIGHT NW WINDS OVERNIGHT.


&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...FROST ADVISORY UNTIL 8 AM CDT MONDAY FOR NDZ006-007-014-015-024-
     026-054.

MN...NONE.
&&

$$

UPDATE...JK
SHORT TERM...VOELKER
LONG TERM...GUST/VOELKER
AVIATION...JK





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