Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 270407
AFDFGF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
1007 PM CST WED NOV 26 2014

.UPDATE...
ISSUED AT 1006 PM CST WED NOV 26 2014

HIGH PRESSURE WAS LOCATED DOWN THE RED RIVER. WILL LOWER TEMPS WITH
FRESH SNOW COVER OVER SOUTHWEST COUNTIES. DEWPOINTS CONTINUE TO FALL
WITH FALLING TEMPS. WILL LOWER TEMPS FOR TONIGHT MOST AREAS. NO
OTHER CHANGES MADE.

UPDATE ISSUED AT 656 PM CST WED NOV 26 2014

NW TO SE ORIENTATED UPPER LEVEL JET WAS WEST OF THE FORECAST AREA
AND WILL SHIFT OVER THE RED RIVER VALLEY BY MORNING. PRECIPITABLE
WATER WAS UNDER ONE TENTH OF AN INCH AND WILL INCREASE SLIGHTLY IN
THE WESTERN ZONES BY MORNING. HIGH PRESSURE WAS LOCATED JUST WEST
OF THE RED RIVER. TEMPS ALREADY BELOW ZERO OVER ALL BUT THE FAR
SOUTHEAST ZONES. TWEAKED WINDS A BIT FOR TONIGHT. NO OTHER CHANGES
MADE AT THIS TIME.

&&

.SHORT TERM...(THIS EVENING THROUGH THURSDAY NIGHT)
ISSUED AT 328 PM CST WED NOV 26 2014

FORECAST CHALLENGE FOR THE SHORT TERM WILL BE OVERNIGHT LOWS
TONIGHT AS WELL AS TIMING AND AMOUNT OF SNOW THANKSGIVING NIGHT. A
SURFACE HIGH WILL DROP INTO THE VALLEY TONIGHT AND BRING A VERY
COLD AND DRY AIR MASS. THIS WILL RESULT IN OVERNIGHT LOWS WELL
BELOW SEASONAL NORMS. A CLIPPER THEN MOVES INTO EASTERN MONTANA
TOMORROW NIGHT AND A BAND OF SNOW IS EXPECTED TO FORM OVER
PORTIONS OF CENTRAL AND EASTERN NORTH DAKOTA ON INTO NORTHWEST
MINNESOTA. HAVE USED A BLEND OF NAM DNG AND HRRR FOR OVERNIGHT
LOWS TONIGHT AND A MODEL BLEND FOR THE THANKSGIVING NIGHT SYSTEM
AS THERE ARE STILL VARIATIONS ON THE PLACEMENT OF SNOW.

TONIGHT...CURRENT VIS SATELLITE SHOWS CLEARING LINE HAS MADE IT AS
FAR SOUTH OF I 94. DEW POINTS NORTH OF THIS MID CLOUD DECK ARE
ALREADY 5 TO 10 BELOW AND IN THE MID TEENS BELOW ACROSS SOUTHERN
MANITOBA. THE RIDGE AXIS EXTENDING OUT OF A HIGH OVER MANITOBA WILL
BRING CALM WINDS TO THE DVL REGION EARLY IN THE EVENING...AND WITH
A LIGHT COVERING OF FRESH SNOW THE TEMPS SHOULD QUICKLY DROP TO 5
TO 10 BELOW THIS EVENING. BY MORNING...RETURN FLOW SETS UP OVER
THE DEVILS LAKE BASIN REGION UP THROUGH
TOWNER/PEMBINA/CAVALIER COUNTIES. THIS WILL ALLOW WIND CHILLS TO
DROP INTO THE 20 TO 25 BELOW RANGE TONIGHT...AND EVENING SHIFT
WILL NEED TO MONITOR CLOSELY AS COLDER TEMPS WOULD BRING AREA INTO
WIND CHILL ADVISORY CRITERIA (LESS THAN 25 BELOW ZERO). WARMEST
TEMPS SHOULD BE ACROSS THE FAR SOUTH AS THE CURRENT MID CLOUDS
WILL DELAY RADIATIONAL COOLING FOR AT LEAST A FEW HOURS THIS
EVENING...BUT EXPECT THAT AREA TO CLEAR OUT BY 02Z TO 03Z. DEW
POINTS ARE ABOUT 10 DEG HIGHER IN THIS REGION SO NOT LOOKING FOR
AS SIGNIFICANT OF A DROP OFF. RIDGE AXIS SHOULD THEN BE OVER THE
EAST TOMORROW MORNING AND TEMPS SHOULD DROP TO AROUND 10 BELOW.

TOMORROW AND TOMORROW NIGHT...A VERY COLD START TO THE DAY WILL LIMIT
DAYTIME HIGHS DESPITE SOME SOLAR IN THE MORNING BEFORE WE SEE
INCREASING CLOUDS FROM WEST TO EAST TOMORROW AFTERNOON. TEMPS WILL
STRUGGLE TO BREAK 10 ABOVE. BAND OF SNOW ASSOCIATED WITH WARM
ADVECTION AND ISENTROPIC LIFT WILL SET UP OVER WESTERN ND TOMORROW
MORNING AND MOVE INTO CNTRL ND IN THE AFTN. A BAND OF ISENTROPIC
LIFT INTENSIFIES AND MOVES INTO THE WESTERN CWA BETWEEN 00Z AND
06Z. NAM 280K ISENTROPIC SFC WINDS IN THE 20 TO 30 KT RANGE ARE
DIRECTLY PERPENDICULAR TO THE PRESSURE GRADIENT AND SHOULD BE
SUFFICIENT TO LIFT THE PARCEL ABOUT 100 MB...WITH NEARLY SATURATED
CONDENSATION PRESSURE DEFICITS IN EASTERN NORTH DAKOTA. THERE IS
STILL DIFFERENCES IN THE PLACEMENT OF THE SNOW...WITH ECMWF A BIT
FURTHER SOUTH AND WEST THAN THE 18Z NAM AND 12Z GFS. HPC QPF
GUIDANCE PREFERS THE SLIGHTLY NORTHWARD SOLUTION...AND HAVE
UPDATED SNOW RATIOS TO YIELD 3 TO 4 INCHES IN NORTH OF THE DEVILS
LAKE REGION DOWN THROUGH THE CENTRAL VALLEY.

.LONG TERM...(FRIDAY THROUGH WEDNESDAY)
ISSUED AT 328 PM CST WED NOV 26 2014

FRIDAY...SNOW SHOULD BEGIN TAPERING OFF FRIDAY MORNING BUT
PORTIONS OF EASTERN NORTH DAKOTA TO INCLUDE THE NORTHERN VALLEY
WILL HAVE ANOTHER TWO TO FOUR INCHES OF SNOW.  MOTORISTS IN
NORTHEASTERN NORTH DAKOTA CAN EXPECT LESS THAN DESIRABLE DRIVING
CONDITIONS FOR BLACK FRIDAY SHOPPING...ESPECIALLY IN THE EARLY
MORNING HOURS. ANOTHER SFC LOW ENTERS EASTERN MT FRI AFTN AND
MOVES INTO THE DAKOTAS OVERNIGHT. MODELS CONTINUING TO DIFFER ON
QPF AMOUNTS AND PLACEMENT OF THIS SECOND SHOT OF SNOW. GFS IS THE
MOST BULLISH AND BRINGS SOUTHERN EDGE OF SNOW BAND DOWN TO THE
HIGHWAY 2 CORRIDOR WHILE THE NAME IS FAIRLY DRY AND THE ECMWF
KEEPS SNOW MAINLY NORTH OF INTL BORDER. DO TO MODEL INCONSISTENCY
WILL USE CONTINUITY AS SOLUTION...WITH LOW CHANCE POPS ACROSS THE
NORTHERN TIER OF COUNTIES. WILL LIKELY SEE A BREAK MID DAY BETWEEN
THE TWO SNOW PRODUCING SYSTEMS SHOULD THE SNOW SET UP ALONG AND
NORTH OF HWY 200...THE MOST LIKELY AREA FOR ADDITIONAL
ACCUMULATION. DAYTIME HIGHS WILL BE WARMER ON FRIDAY AND JUMP
INTO THE MID 20S ACROSS THE SOUTH.

SATURDAY...GFS/ECMWF CONTINUE TO SHOW LINGERING SNOW SHOWERS
ACROSS THE NORTH AS NW SFC FLOW SETS UP...WHILE THE NAM REMAINS
DRY. WILL KEEP CONTINUITY FOR THIS PERIOD AS WELL...ALTHOUGH ANY
SNOW ON SATURDAY SHOULD BE LIGHT WITH LITTLE ACCUMULATION.

SATURDAY NIGHT THROUGH WEDNESDAY...MODELS START OUT IN FAIRLY DECENT
AGREEMENT...PUSHING A POSITIVELY TILTED TROUGH THROUGH THE NORTHERN
ROCKIES AND PLAINS OVER THE WEEKEND. THE COLD FRONT WILL MOVE
THROUGH THE CWA SATURDAY NIGHT AND COLD HIGH PRESSURE WILL BE IN
PLACE FOR SUNDAY. CONTINUED TO KEEP SOME 30ISH POPS FOR WHEN THE
FRONTAL BOUNDARY PASSES...THEN DRYING OUT INTO THE EARLY PART OF THE
WORK WEEK. TEMPS WILL AGAIN BE WELL BELOW AVERAGE WITH LOWS IN THE
TEENS BELOW ZERO AND HIGHS IN THE SINGLE DIGITS ABOVE FOR SUNDAY AND
MONDAY.

MODEL CONSENSUS STARTS TO DIVERGE BY TUESDAY AND WEDNESDAY. THE GFS
IS MORE ACTIVE AND BRING A VIGOROUS SHORTWAVE THROUGH THE NORTHERN
PLAINS WITH SFC LOW PRESSURE JUST TO OUR NORTH AND THE CWA SHOWING
SOME STRONG WARM AIR ADVECTION MONDAY AND EARLY TUESDAY BEFORE THE
NEXT COLD FRONT COMES IN. THE ECMWF IS WEAKER AND DRIER. ENSEMBLE
MEMBERS SHOW A GOOD AMOUNT OF SPREAD...SO FOR NOW KEPT ONLY MINIMAL
POPS AS THE OPERATIONAL GFS IS ONE OF THE WETTER SOLUTIONS. TEMPS
SHOULD SEE SOME WARMING ON TUESDAY AND COLDER AGAIN ON
WEDNESDAY...BUT EVEN THE HIGHER TEMP DAYS WILL STILL BE BELOW
SEASONAL AVERAGES.

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z THURSDAY EVENING)
ISSUED AT 656 PM CST WED NOV 26 2014

VFR CONDITIONS ARE ACROSS THE AREA AND EXPECT VFR CONDITIONS TONIGHT
AND THU. CIRRUS CLOUDS SHOULD MOVE IN AFTER MIDNIGHT AND CIGS SHOULD
LOWER TO AROUND 10 THOUSAND FT IN EASTERN ND...HIGHER IN THE EASTERN
ZONES THU AFTERNOON.


&&

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

$$

UPDATE...HOPPES
SHORT TERM...SPEICHER
LONG TERM...JR/SPEICHER
AVIATION...HOPPES



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