Area Forecast Discussion
Issued by NWS Grand Forks, ND

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS63 KFGF 172005
AFDFGF

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
305 PM CDT SUN AUG 17 2014

.SHORT TERM...(THIS EVENING THROUGH MONDAY NIGHT)
ISSUED AT 305 PM CDT SUN AUG 17 2014

TIMING AND PLACEMENT OF PRECIP TONIGHT AND TOMORROW WILL BE THE
MAIN FORECAST HEADACHES FOR THE SHORT TERM.

THE MAIN UPPER TROUGH CURRENTLY SEEN ON WV LOOP ROTATING OVER
EASTERN MT WILL MOVE OFF INTO THE NORTHERN PLAINS TONIGHT. SFC
TROUGH CURRENTLY EXTENDING DOWN INTO WESTERN ND WILL ARRIVE IN THE
RED RIVER VALLEY OVERNIGHT. TOWERING CU AND STORMS HAVE STARTED TO
DEVELOP TO OUR WEST ALONG THE TROUGH AXIS...ALTHOUGH THERE WILL
NOT BE AS MUCH INSTABILITY OVER OUR AREA THANKS TO PERSISTENT
CLOUDS. THINK THAT THE STORMS WILL BEGIN TO MOVE INTO THE DEVILS
LAKE BASIN IN THE EARLY EVENING AND THEN INTO THE RED RIVER VALLEY
AROUND MIDNIGHT. THE STORMS HAVE BEEN RATHER SPARSE ALONG THE
TROUGH AXIS OUT WEST BUT THINK THEY SHOULD FILL IN A BIT. WILL
CONTINUE TO TRANSITION LIKELY POPS FROM WEST TO EAST TONIGHT
ACROSS THE CWA. WITH DEEP LAYER SHEAR PRETTY WEAK...AM NOT TOO
IMPRESSED WITH SEVERE CHANCES OVERNIGHT. HEAVY RAIN SHOULD BE THE
MAIN THREAT AS PWAT VALUES REACH THE 1.5 TO 2 INCH RANGE. WILL
HAVE TO WATCH IF ANY HEAVY CELLS GO OVER THE SAME ONES FROM LAST
NIGHT. LOWS SHOULD STAY IN THE 60S THANKS TO CLOUDS.

THE UPPER TROUGH AXIS WILL MOVE INTO MN BY MONDAY...WITH
NORTHWESTERLY SFC WINDS BEHIND THE DEPARTING LOW. ALL OF THE
MODELS CONTINUE TO LINGER PRECIP EAST OF THE RED RIVER THROUGH
TOMORROW...PARTICULARLY AS A REINFORCING SHORTWAVE DIGS DOWN INTO
THE TROUGH. WILL KEEP POPS HIGH IN THE EAST THROUGHOUT THE DAY ON
MONDAY BEFORE SLOWLY TAPERING THEM OFF MONDAY NIGHT AS THE UPPER
TROUGH FINALLY PULLS FURTHER EAST. TEMPS ON MONDAY SHOULD BE NEAR
TO SLIGHTLY BELOW AVERAGE IN THE 70S BUT LINGERING CLOUDS WILL
HELP KEEP LOWS MONDAY NIGHT AROUND 60 DEGREES.

.LONG TERM...(TUESDAY THROUGH SUNDAY)
ISSUED AT 305 PM CDT SUN AUG 17 2014

TUESDAY AND WEDNESDAY...WITH AN UPPER RIDGE BUILDING BRIEFLY INTO
THE PLAINS...CONDITIONS WILL BE FAIRLY QUIET ON TUESDAY BEFORE THE
NEXT SHORTWAVE MOVES INTO WESTERN ND ON WEDNESDAY. KEPT THE
FORECAST DRY FOR TUESDAY ALTHOUGH A FEW MODELS CONTINUE TO KEEP
SOME QPF OVER THE FAR EAST...BUT WITH NO REAL FORCING TO WORK WITH
THIS DOES NOT SEEM LIKELY. MODELS ARE STRUGGLING WITH THE TIMING
OF THE NEXT SHORTWAVE...WITH SOME MODELS KEEPING IT WELL SOUTH AND
WEST OF US AND OTHERS BRINGING STORMS WELL INTO OUR WESTERN
COUNTIES. WENT WITH SOME LOW POPS IN OUR WEST FOR NOW AND WILL
ADJUST AS NEEDED. KEPT HIGHS IN THE 80S AS WE SHOULD SEE SOME
DECENT SUNSHINE UNDER THE RIDGE.

WEDNESDAY NIGHT-SUNDAY...THE SYNOPTIC FLOW PATTERN WILL BE IN
TRANSITION TO A WESTERN CONUS TROUGH AND DOWNSTREAM RIDGE...ALTHOUGH
VARIOUS MODEL RUNS HAVE SHOWN DIFFERENCES IN THE ORIENTATION OF THIS
PATTERN...WHICH CONTINUES WITH THE 12Z MODEL RUNS. ALTHOUGH
CONFIDENCE IN DETAILS IS EXTREMELY LOW GIVEN THE MODEL
DIFFERENCES...THE GENERAL TREND WILL BE WETTER AND COOLER.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY AFTERNOON)
ISSUED AT 1225 PM CDT SUN AUG 17 2014

MVFR/IFR CIGS WILL ADVECT EASTWARD THROUGH THE AFTERNOON HOURS...AND
THERE SHOULD BE A PERIOD OF MOSTLY CLEAR SKY THIS EVENING. USED THE
LATEST HRRR/RAP FOR TIMING GUIDANCE. THE NEXT CONCERN WILL BE
THUNDERSTORM CHANCES MOVING THROUGH THE REGION LATER THIS EVENING
AND OVERNIGHT.


&&

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

$$

SHORT TERM...JR
LONG TERM...JR/TG
AVIATION...TG





USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.