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000
FXUS63 KFGF 171758 AAA
AFDFGF

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE GRAND FORKS ND
1258 PM CDT MON JUN 17 2013

.UPDATE...
ISSUED AT 1258 PM CDT MON JUN 17 2013

SCT-BKN THERMAL CU HAVE DEVELOPED ACROSS THE ENTIRE FORECAST
AREA...BUT AREAS THAT RECEIVED SUN THIS MORNING WARMED MORE
QUICKLY THAN ANTICIPAED. WITH CLOUD COVER...TEMPERATURES WON/T
RISE MUCH MORE FROM CURRENT READINGS AND ADJUSTED DIURNAL CURVE TO
MATCH LATEST OBSERVATIONAL TRENDS. ALSO INCREASED CLOUD COVER
THROUGH MID-AFTERNOON WITH DECREASING CLOUDS LATE AFTERNOON
THROUGH THE EVENING.

A FEW SHOWERS HAVE DEVELOPED ACROSS NORTHWEST MN FROM NEAR THIEF
RIVER FALLS TO ADA. EXPECT SCATTERED NATURE OF SHOWERS TO CONTINUE
WITH AN ISOLATED LIGHTNING STRIKE OR TWO POSSIBLE. OTHERWISE...
FORECAST IN GOOD SHAPE.

UPDATE ISSUED AT 1002 AM CDT MON JUN 17 2013

15 UTC WATER VAPOR LOOP SHOWS A WEAK UPPER LEVEL VORTICITY MAXIMUM
NEAR THE MT/ND/CANADA BORDER. THIS LOW WILL SLIDE SOUTHEASTWARD
THROUGH THE DAY...DRAGGING WITH IT AN EXPANSIVE STRATOCU DECK.
MODEL BUFR SOUNDINGS SHOW CONVECTIVE TEMPERATURES IN THE MID TO
UPPER 60S BY 21 UTC...SO THINK REMAINING CLEAR AREAS THIS MORNING
SHOULD FILL-IN WITH BROKEN CU LATE THIS MORNING AND AFTERNOON.
SOME SCATTERED SHOWERS AND ISOLATED THUNDER ARE POSSIBLE WITH
THESE CLOUDS FOR MUCH OF THE FORECAST AREA...BUT ANY ACCUMULATION
SHOULD BE A TENTH OF LESS. WILL KEEP POPS IN THE 20 TO 50 PERCENT
RANGE THROUGH THE DAY...BUT DID INCREASE SKY COVER A BIT AND AS A
RESULT...LOWERED AFTERNOON HIGHS A COUPLE DEGREES. OTHERWISE...REST
OF THE FORECAST ON TRACK WITH NO SIGNIFICANT CHANGES.

&&

.SHORT TERM...(TODAY THROUGH TUESDAY)
ISSUED AT 345 AM CDT MON JUN 17 2013

CHALLENGE FOR THE FORECAST THIS MORNING WILL BE PLACEMENT OF
SHOWER ACTIVITY THIS AFTERNOON AND TEMPERATURES WITH CLOUDS TODAY.
MODELS IN GOOD AGREEMENT AND WILL CONTINUE TO USE A BLEND FOR THE
FORECAST.

TODAY...500MB SHEAR AXIS AND COLD POOL WILL MOVE OVER THE CWFA
LOWERING CONVECTIVE TEMPS A GOOD 5 TO 10 DEGREES FROM YESTERDAY.
THIS WILL ALLOW SHOWERS AND...GIVEN AFOREMENTIONED COLD POOL
ALOFT...ENOUGH INSTABILITY FOR ISOLATED THUNDERSTORMS TO DEVELOP.
THIS CONVECTIVE ACTIVITY WILL SLOWLY SAG TO THE SOUTH AND EAST
DIMINISHING SHORTLY AFTER SUNSET AS A SFC HIGH BUILDS INTO THE
AREA.

SFC HIGH WILL TRAVERSE THE CWFA TUESDAY MORNING WITH SOME COOLER
MIN TEMPS POSSIBLE...MID TO UPPER 40S ACROSS THE MN TREES. RETURN
FLOW BEGINS ACROSS THE RRV AND DVL BSN KEEPING TEMPS UP INTO THE
LOW 50S. LIGHT SE WINDS TUESDAY WITH TEMPS GREATLY INFLUENCED BY
CLOUD COVER IF ANY...HIGHS IN THE MID TO UPPER 70S.

.LONG TERM...(TUESDAY NIGHT THROUGH SUNDAY)
ISSUED AT 345 AM CDT MON JUN 17 2013

TUESDAY NIGHT TO WEDNESDAY NIGHT...SFC HIGH CONTINUES TO TRACK TO
THE SOUTHEAST WITH RETURN FLOW SETTING UP AS 500MB RIDING
OCCURS...LIFTING THE 500MB NW FLOW TO THE NE THROUGH OUT THE DAY
WEDNESDAY. AS A RESULT INCREASING MOISTURE ON THE SOUTHERLY 850MB
WINDS AND POTENTIAL FOR WEAK SW ENERGY TO PULSE OUT OF UPPER LOW
OVER PAC-NW...WILL KEEP MENTION OF CHC POPS WEDNESDAY NIGHT AS
850MB CONVERGENCE MAY PROVIDE ENOUGH LIFT FOR SOME CONVECTIVE
ACTIVITY.

THURSDAY-SUNDAY...MODELS IN GOOD AGREEMENT INDICATING AN UPPER LOW
ACROSS THE NORTHWEST CONUS TO BEGIN THE PERIOD. THIS FEATURE WILL
SLOWLY PROPAGATE EASTWARD AND SHOULD BE LOCATED JUST NORTH OF THE FA
ON SUNDAY. ANTICIPATE MULTIPLE WAVES EJECTING FROM THIS UPPER LOW
AND MOVING THROUGH THE FA. LOW LEVEL SOUTHERLY FLOW WILL ADVECT
HIGHER MOISTURE INTO THE REGION...SETTING THE STAGE FOR AN UNSETTLED
PERIOD. THE POTENTIAL WILL EXIST FOR STRONG TO SEVERE STORMS...BUT
THERE IS STILL SOME UNCERTAINTY AS TO THE DEGREE OF MOISTURE AND
INSTABILITY THAT WILL BE IN PLACE DURING THIS PERIOD. MODELS
DISAGREE WITH TIMING OF POSSIBLE THUNDER COMPLEXES...AND WILL STICK
WITH THE BLENDED SOLUTION. TEMPERATURES WILL BE NEAR NORMAL VALUES.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON)
ISSUED AT 1258 PM CDT MON JUN 17 2013

MVFR CIGS PERSIST ACROSS DVL BASIN AND FAR NE FA WITH REMAINDER OF
CU FIELD IN VFR RANGE. EXPECT FAR EAST AND WEST TO CONTINUE TO SEE
LIFTING CIGS WITH ENTIRE FA VFR BY MID AFTERNOON. SHRA BEGINNING TO
DEVELOP AND CANNOT RULE OUT STRAY LTG STRIKE. OVERALL SHOULD NOT
AFFECT CIGS/VSBY SIGNIFICANTLY. SKIES WILL CLEAR OFF BY MID EVENING
WITH WINDS BECOMING VRB AS SURFACE HIGH BUILDS IN OVERHEAD.

&&

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

$$

UPDATE...ROGERS
SHORT TERM...JK
LONG TERM...TG/JK
AVIATION...VOELKER