Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 210919
AFDFGF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
319 AM CST FRI NOV 21 2014

.SHORT TERM...(TODAY THROUGH SATURDAY)
ISSUED AT 320 AM CST FRI NOV 21 2014

THE MAIN CHALLENGE WILL BE TEMPS INITIALLY...THEN THREAT FOR SOME
SNOW/BLOWING SNOW LATER SUNDAY INTO MONDAY. MODELS ARE IN VERY
GOOD OVERALL AGREEMENT...AND PREFER THE GFS THAT HAS BEEN
CONSISTENT...BUT NO REAL DIFFERENCES NOTED.

FOR TODAY...SOUTHERLY WINDS WILL BE BRISK THROUGH MOST OF THE
DAY...AND COULD GUST TO NEAR 30KT IN THE NORTHERN VALLEY AT
TIMES. THE MERCURY SHOULD CLIMB TO NEAR FREEZING ALONG AND WEST OF
THE VALLEY...AND WOULD BE THE FIRST TIME SINCE NOVEMBER 8 HITTING
32 FOR MOST AREAS. THERE WILL BE A BAND OF STRATUS MOVING NORTH
THIS MORNING...BUT EXPECT JUST HIGH CLOUDS FOR MOST. THERE COULD
BE SOME DRIFTING SNOW WHERE THERE IS SOME SNOW ON THE GROUND IN
THE NORTH VALLEY...MAINLY IN WESTERN MARSHALL/KITTSON AND POLK
COUNTIES...BUT WON/T MENTION ANY BLOWING SNOW WITH WINDS NOT QUITE
STRONG ENOUGH.

FOR TONIGHT...IT WILL BE MILD COMPARED TO RECENT NIGHTS...WITH
ZONAL FLOW ALOFT AND 850MB TEMPS ABOVE 0C.

ON SATURDAY...ANOTHER WARM DAY IS EXPECTED WITH MOST AREAS INTO
THE LOW AND PERHAPS MID 30S NEAR SNOW FREE AREAS. THERE WILL BE
MORE CLOUDS IN THE NORTH CLOSER TO DEEPER MOISTURE AHEAD OF NEXT
ALBERTA CLIPPER SYSTEM.

.LONG TERM...(SATURDAY NIGHT THROUGH THURSDAY)
ISSUED AT 320 AM CST FRI NOV 21 2014

FOR SAT NIGHT...THERE COULD BE SOME MIXED PRECIP...MAINLY FREEZING
RAIN PERHAPS ACCORDING TO TOP DOWN METHOD IN THE DEVILS LAKE
BASIN. MOST AREAS SHOULD REMAIN DRY...BUT MODELS ARE HINTING AT
THE POTENTIAL FOR LOWER LEVEL MOISTURE AND WILL HAVE TO MONITOR
FOR FREEZING DRIZZLE POTENTIAL AS WELL.

ON SUNDAY...SFC LOW PRESSURE WILL MOVE ALONG THE INTERNATIONAL
BORDER AREA. DEEPER LAYERED SATURATION AND MID LEVEL LIFT WILL
MOVE INTO THE NORTH AND WEST FIRST...THEN SPREAD EAST THROUGH THE
DAY. THERE WILL BE THE CHANCE FOR SOME LIGHT SNOW...MAINLY IN THE
NORTHER AREAS LATER IN THE DAY. NORTHERLY WINDS WILL INCREASE
BEHIND A COLD FRONT...AND IF THERE IS ANY SNOW IN THE FAR NW LATER
SUNDAY THEN SOME BLOWING SNOW IS POSSIBLE.

FOR SUNDAY NIGHT...DEEPER MOISTURE WILL OVERSPREAD THE REGION NEAR
A TROWAL. THERE SHOULD BE SOME LIGHT SNOW FOR MOST AREAS...WITH
PERHAPS AN INCH FOR MOST AREAS POSSIBLE. NORTHERLY WINDS WILL
INCREASE AND THERE WILL BE 40KT TO MIX IN THE VALLEY AFTER 06Z
MONDAY. THIS SHOULD YIELD AT LEAST PATCHY BLOWING SNOW FOR AREAS
THAT GET AN INCH OF SNOW...AND THERE COULD BE MORE VISIBILITY
ISSUES WHERE A CURRENT SNOW PACK OF 2 INCHES OR MORE IS IN PLACE.
THERE COULD BE SOME MELTING/CRUSTING OF SNOW PACK THOUGH THIS
WEEKEND...SO EXPECT VSBY ISSUES TO BE HIGHLY DEPENDENT ON JUST
HOW MUCH SNOW FALLS. THE GFS GIVES THE NORTHERN AREAS ABOUT 2
INCHES...WITH AN INCH OR SO NEAR GFK...AND LIGHTER AMOUNTS TO THE
SOUTH. IF THIS WOULD VERIFY...THEN THE MONDAY MORNING COMMUTE
WOULD BE IMPACTED WITH BLOWING SNOW AND LOW VSBYS IN OPEN COUNTRY
...SO WILL START TO MENTION BLOWING SNOW IN THE VALLEY AND HIGHLIGHT
IN THE HWO.

MONDAY THROUGH THURSDAY...EXTENDED BEGINS WITH MODELS IN DECENT
AGREEMENT THAT DEPARTING LOW MAKES MONDAY A WINDY DAY. TROWAL SETUP
SUGGESTS WRAP AROUND SNOWFALL WILL BE OF A SUFFICIENT AMOUNT TO BE
BLOWN AROUND BY STRONG WINDS. HAVE USED THE MOS WINDS FOR MONDAY
INTO MONDAY EVENING AS LOCAL TOOLS INDICATE A FAVORABLE PATTERN FOR
SURFACE WIND GUSTS TO 35 KTS. HAVE KEPT PREVIOUS FCST OF BS WHERE
SNOWFALL OCCURS. TEMPERATURES WILL PROBABLY BE STEADY OF FALL SLOWLY
IN CAA.

AS SNOW ENDS LATE MONDAY FAST NORTHWEST FLOW DRIVES ANOTHER WAVE
ACROSS THE CWFA TUESDAY INTO WEDNESDAY. MODELS IN FAIR AGREEMENT
THAT ALBERTA CLIPPER SYSTEM/UPPER WAVE MOVES ALONG A TRACK FAVORABLE
FOR MEASURABLE SNOWFALL.

FOR WEDNESDAY AND THURSDAY SURFACE HIGH BUILDS INTO THE NORTHERN
PLAINS RETURNING THE REGION TO A TEMPERATURE REGIME MORE LIKE MID
JANUARY THAN LATE NOVEMBER.

&&

.AVIATION...(FOR THE 06Z TAFS THROUGH 06Z FRIDAY NIGHT)
ISSUED AT 1143 PM CST THU NOV 20 2014

CONDITIONS CURRENTLY VFR AT ALL SITES...BUT WILL HAVE TO KEEP AN
EYE ON A BAND OF MVFR TO IFR STRATUS THAT HAS BEEN LINGERING OVER
CENTRAL ND INTO SD. SAT LOOP TRENDS SHOW THAT THE STRATUS HAS BEEN
MOVING MOSTLY IN A NORTHERLY DIRECTION WITH ONLY A SLIGHT EASTWARD
COMPONENT. MORE MID AND HIGH CLOUDS MOVING IN FROM THE WEST INTO
THE FORECAST AREA. WILL HAVE KDVL GO MVFR FOR A PERIOD
TONIGHT...BUT KEPT ONLY A SCATTERED 1500 FT DECK FOR STATIONS
FURTHER EAST GIVEN THE FACT THAT THE SOUTHERN END OF THE STRATUS
BAND HAS BEEN DISSIPATING. WINDS HAVE SHIFTED AROUND TO THE SOUTH
AND THEY SHOULD PICK UP TO THE 15 TO 20 KT RANGE WITH HIGHER GUSTS
BY AFTERNOON.

&&

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

$$

SHORT TERM...DK
LONG TERM...EWENS/DK
AVIATION...JR






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