Special Weather Statement, NWS Grand Forks, ND

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
822 PM CDT SAT JUN 9 2012

.DISCUSSION...

WILL BE BRIEF WITH STORMS DEVELOPING THIS EVENING. EXPECT STORMS
TO SLOWLY BUILD SOUTH ALONG COLD FRONT INTO EASTERN ND THIS
EVENING. ANOTHER BAND OF STORMS WILL LIKELY FORM OVERNIGHT TO THE
SW AND MOVE INTO THE AREA AFTER MIDNIGHT. ANY STORMS THAT FORM
COULD BE SEVERE GIVEN THE HIGH CAPE/SHEAR ENVIRONMENT. THERE IS A
WINDOW UNTIL ABOUT 10 PM WHERE A TORNADO IS POSSIBLE...NEAR THE
CANADIAN BORDER CLOSE TO THE WARM FRONT. OTHERWISE...THE MAIN
THREATS WILL BE LARGE HAIL AND DAMAGING WINDS. GRIDS ARE IN GOOD
SHAPE WITH NO CHANGES PLANNED.

&&

.AVIATION...

SHOWER AND THUNDER CHANCES WILL SPREAD FROM WEST TO EAST OVERNIGHT
AND INTO SUNDAY. WINDS WILL DECREASE THIS EVENING THEN TURN
WESTERLY LATER TONIGHT AND SUNDAY. THERE COULD BE SOME MVFR
CIGS/VSBYS NEAR ANY STORMS AND SHOWERS LATE TONIGHT AND SUNDAY.

&&

.PREV DISCUSSION... /ISSUED 240 PM CDT SAT JUN 9 2012/

DISCUSSION...FORECAST CHALLENGE CONCERNS CONVECTIVE THREAT THROUGH
SUNDAY AND TEMPERATURES. MODELS CONTINUE IN GENERAL AGREEMENT IN THE
SHORT.

SURFACE LOW CURRENTLY OVER W CENTRAL/CENTRAL ND WITH E-W ORIENTED
WARM FRONT ALONG HIGHWAY 200 THEN ANGLING NE ACROSS NW MN. WITH MORE
SOLAR THIS AFTERNOON AND MSAS SURFACE PRESSURE FALLS SURFACE LOW AND
ASSOCIATED BOUNDARY STILL EXPECTED TO LIFT N TO NEAR INTERNATIONAL
BORDER AREA THIS EVENING. AIRMASS IN WARM SECTOR UNSTABLE BUT
HEALTHY CAP IN PLACE. CIN DOES ERODE IN DVL BASIN TOWARDS 00Z AND
DEPENDING ON POSITION OF BOUNDARIES/LOW COULD SEE SOME DEVELOPMENT.
IF SURFACE LOW/WARM FRONT PUSHES INTO CANADA PRIOR TO CONVECTIVE
INITIATION BETTER CHANCES WILL BE LATER TONIGHT WITH NEXT LOW
LIFTING NE ALONG BOUNDARY. SHORTWAVE WILL ALSO BE KICKER TO START
PUSHING COLD FRONT EASTWARD. BEST CONVERGENCE WITH LOW LEVEL JET
TONIGHT WILL BE IN CENTRAL SD WITH STORMS LIKELY PROPAGATING NE
ALONG BOUNDARY LATE TONIGHT INTO SUNDAY. WITH EXCEPTION OF FAR NW FA
WILL BE IN THE WARM SECTOR OVERNIGHT LEADING TO WARM TEMPERATURES
AND SOMEWHAT STICKY WITH DEWPOINTS IN THE 60S.

SUNDAY COULD BE ACTIVE DAY AS COLD FRONT PUSHES ACROSS FA. WILL
LIKELY HAVE ONGOING CONVECTION IN THE MORNING CONTINUING WITH MORE
STRENGTHENING IN THE AFTERNOON. BOUNDARY SHOULD BE VCNTY VALLEY
REGION WITH BEST STORM POTENTIAL IN THE AFTERNOON TO EAST OF FRONT.
TEMPERATURES WILL HINGE ON CLOUDS BUT WITH COLUMN COOLING NW-SE WILL
SEE PERHAPS SIGNIFICANT TEMPERATURE SPREAD WITH FAR SE REMAINING
PRETTY WARM PRIOR TO FROPA.

ONGOING CONVECTION SHOULD BE FOCUSED ALONG PREFRONTAL TROUGH WHICH
SHIFTS EAST OF FA DURING THE EVENING. NOT REAL CONFIDENT ON
POTENTIAL OF ANY POST FRONTAL PCPN AT THIS POINT WHICH MODELS TEND
TO OVERDO. WILL SEE MINIMUMS CLOSER TO EARLY SUMMER VALUES.

TRUE COLD FRONT SWINGS THROUGH FA MONDAY. MODELS DIFFER ON STRENGTH
OF COLD ADVECTION BUT COOLING IS SIGNIFICANT AND MANY AREAS WILL SEE
MAX TEMPERATURES WELL BLO AVERAGE. COULD SEE A FEW SHOWERS WITH
MOIST LAYER AND COLD ADVECTION. OF MORE SIGNIFICANCE WILL BE GUSTY
NW WINDS. WILL BE WINDY AND HIGHER TERRAIN COULD APPROACH ADVISORY
CRITERIA DURING THE DAY AND WILL NEED TO BE MONITORED.

HIGH PRESSURE BUILDS IN FOR MONDAY NIGHT-TUESDAY. TEMPERATURES TO
REMAIN WELL BLO AVERAGE THROUGH THE PERIOD BUT NO PCPN EXPECTED.

LONG TERM... /TUE NIGHT THROUGH SAT/
LONG TERM SHOULD WILL BE MORE ACTIVE WITH A ZONAL PATTERN AND
SEVERAL SHORT WAVES...COUPLED WITH INCREASING MOISTURE THROUGHOUT
THE LATTER HALF OF NEXT WEEK. STRONGEST WAVE COMES IN NEAR THE DAY 7
TIMEFRAME. EXPECT TO SEE SHOWERY/STORMY CONDS BUT HARD TO NAIL DOWN
A SPECIFIC PERIOD THIS FAR OUT...AS MODELS DIVERGE MAINLY ON SFC
FEATURES. IN GENERAL EXPECT A TRANSITION FROM COOL AND DRY TO WARM
AND HUMID BY THE END OF NEXT WEEK.

&&

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

DK

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND FORKS ND
553 AM CDT SAT JUN 9 2012

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-101200-
WEST POLK-NORMAN-CLAY-KITTSON-ROSEAU-LAKE OF THE WOODS-
WEST MARSHALL-EAST MARSHALL-NORTH BELTRAMI-PENNINGTON-RED LAKE-
EAST POLK-NORTH CLEARWATER-SOUTH BELTRAMI-MAHNOMEN-
SOUTH CLEARWATER-HUBBARD-WEST BECKER-EAST BECKER-WILKIN-
WEST OTTER TAIL-EAST OTTER TAIL-WADENA-GRANT-TOWNER-CAVALIER-
PEMBINA-BENSON-RAMSEY-EASTERN WALSH-EDDY-NELSON-GRAND FORKS-
GRIGGS-STEELE-TRAILL-BARNES-CASS-RANSOM-SARGENT-RICHLAND-
WESTERN WALSH-
553 AM CDT SAT JUN 9 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN NORTH
DAKOTA...WEST CENTRAL AND NORTHWEST MINNESOTA.

.DAY ONE...TODAY AND TONIGHT

A STRONG THUNDERSTORM COMPLEX MAY AFFECT THE CANDO AND LANGDON
AREA DURING THE MORNING HOURS. LARGE HAIL AND STRONG WIND GUSTS
WILL BE THE MAIN THREAT.

MUCH OF SATURDAY WILL BE HOT BUT REMAIN DRY. THUNDERSTORM CHANCES
WILL INCREASE FROM WEST TO EAST THIS EVENING INTO THE OVERNIGHT
HOURS. THE MOST PROBABLE LOCATION FOR ACTIVITY WILL BE ACROSS THE
NORTHERN RED RIVER VALLEY INTO EASTERN NORTH DAKOTA. THERE IS A
SLIGHT RISK FOR SEVERE STORMS ACROSS THIS AREA...WITH LARGE
HAIL...STRONG WINDS...HEAVY RAIN...AND A TORNADO POSSIBLE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

STRONG TO SEVERE THUNDERSTORMS MAY BE ONGOING SUNDAY MORNING NEAR
THE RED RIVER VALLEY. THERE IS A SLIGHT RISK FOR SEVERE
THUNDERSTORMS THROUGH THE DAY ON SUNDAY...AHEAD OF A COLD FRONT
ALONG AND EAST OF THE RED RIVER VALLEY. LARGE HAIL...STRONG
WINDS...HEAVY RAIN...AND A TORNADO OR TWO WILL BE POSSIBLE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS EVENING INTO SUNDAY
AFTERNOON.

TG

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
750 PM CDT SAT JUN 9 2012

NDZ008-100145-
PEMBINA ND-
750 PM CDT SAT JUN 9 2012

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN PEMBINA COUNTY UNTIL 845
PM CDT...

AT 749 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 13 MILES SOUTHWEST OF CAVALIER...OR 25 MILES EAST OF
LANGDON...MOVING TO THE NORTHEAST AT 40 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THE STORM...ALONG WITH FREQUENT LIGHTNING.

THE STORM WILL BE NEAR...
HENSEL AROUND 800 PM CDT.
AKRA AROUND 805 PM CDT.
CAVALIER AND BACKOO AROUND 810 PM CDT.
LEROY AROUND 815 PM CDT.

BE PREPARED TO TAKE SHELTER IF THE STORMS INTENSIFY AND BECOME
SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE.

LAT...LON 4900 9725 4855 9774 4856 9791 4877 9793
      4901 9785
TIME...MOT...LOC 0050Z 214DEG 33KT 4867 9784

HOPKINS

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