Severe Thunderstorm Warning 82, NWS Grand Forks, ND

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND FORKS ND
257 AM CDT FRI JUN 25 2010

.DISCUSSION...
THE MAIN CHALLENGE WILL BE CONVECTIVE CHANCES THROUGH SATURDAY. AN
MCS CONTINUES TO MOVE THROUGH THE DEVILS LAKE BASIN INTO NE ND.
THE GFS IS DOING WELL WITH QPF FIELDS THIS MORNING SO WILL FOLLOW.

FOR TODAY/TONIGHT...EXPECT THE MCS TO BE MOVING INTO MN THIS
MORNING...CONVECTION RE-DEVELOPING THIS AFTERNOON. THE EXTENT OF
SEVERE WEATHER THIS AFTERNOON WILL DEPEND ON HOW MUCH WE CAN HEAT
OUT. THERE SHOULD BE SOME BREAKS BEHIND THE CURRENT COMPLEX...SO
WE SHOULD WARM ENOUGH TO GET CAPES INTO THE 1500-3000J/KG RANGE.
THE BEST CHANCE FOR ORGANIZED SEVERE SHOULD BE IN THE FAR SOUTH
LATER THIS AFTERNOON CLOSER TO THE SFC LOW AND LLJ. THE LLJ WILL
VEER INTO MN SOUTH OF THE FORECAST AREA AFTER 03Z...SO THERE MAY
BE A LULL IN THE CONVECTION TONIGHT. GIVEN THE FAST FLOW ALOFT
THOUGH AND SEVERAL UPSTREAM SHORTWAVES...WILL STILL MAINTAIN LOWER
POPS AFTER 06Z SAT. THERE IS A SLIGHT RISK FOR MOST OF THE AREA
TODAY WITH THE MAIN THREATS LARGE HAIL AND DAMAGING WIND...WITH
HEAVY RAIN NEAR ANY THUNDERSTORM AS WELL.

FOR SAT...THERE ARE STILL SOME TIMING DIFFERENCES TO THE MAIN
SHORTWAVE THAT WILL ROTATE THROUGH THE NORTHERN PLAINS. THIS
MORNINGS RUNS ARE A BIT SLOWER...AND THE TROUGH MAY NOT COME
THROUGH UNTIL SAT NIGHT. THERE WILL STILL BE LARGE SCALE ASCENT
INTO EASTERN ND SAT AFTERNOON...AND EXPECT THE POTENTIAL FOR MORE
SEVERE CONVECTION LATE SAT AFTERNOON THROUGH SAT NIGHT WITH A
SLIGHT RISK ONCE AGAIN.

ON SUNDAY...THERE COULD BE SOME WRAPAROUND CONVECTION IN THE
NORTHEAST WITH COLD ADVECTION. WINDS COULD GET A BIT GUSTY FROM
THE NW ON SUNDAY WITH COOLER TEMPS.

FOR MON-WED...EXPECT A DRY PERIOD WITH TEMPS SLOWLY WARMING.

&&

.AVIATION...

EXPECT MVFR AND ISOLATED IFR CONDITIONS WITH CONVECTION MOVING
INTO EASTERN ND AND WESTERN MN THIS MORNING. THESE CONDITIONS
SHOULD BE FAIRLY SHORT LIVED...WITH HEAVY RAIN ALSO POSSIBLE.

&&

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

DK

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND FORKS ND
339 AM CDT FRI JUN 25 2010

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-260845-
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 COUNTY-EDDY-NELSON-
GRAND FORKS-GRIGGS-STEELE-TRAILL-BARNES-CASS-RANSOM-SARGENT-
RICHLAND-WESTERN WALSH COUNTY-
339 AM CDT FRI JUN 25 2010

...THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS TODAY THROUGH SATURDAY...

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

.DAY ONE...TODAY AND TONIGHT

SEVERE THUNDERSTORMS MAY DEVELOP IN EASTERN NORTH DAKOTA AND WESTERN
MINNESOTA TODAY AND CONTINUE OVERNIGHT. THE MAIN THREAT WILL BE
LARGE HAIL AND DAMAGING WINDS...AND ISOLATED TORNADOES ARE
POSSIBLE THIS AFTERNOON AND EVENING IN SOUTHEAST NORTH DAKOTA INTO
WEST CENTRAL MINNESOTA. IN ADDITION...HEAVY RAINFALL WILL OCCUR NEAR ANY
STORMS...AND LOCALIZED FLOODING IS POSSIBLE IF STORMS CONTINUALLY DEVELOP
OVER ONE AREA.

A MOIST AND UNSTABLE AIRMASS WILL REMAIN OVER THE REGION TODAY AND
TONIGHT...AND REMAIN IN THE AREA THROUGH SATURDAY UNTIL A COLD
FRONT MOVES THROUGH.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS ON SATURDAY FOR
ALL OF EASTERN NORTH DAKOTA AND WESTERN MINNESOTA. A STRONG UPPER
LEVEL DISTURBANCE WILL MOVE THROUGH THE REGION SATURDAY AFTERNOON
AND SATURDAY NIGHT. A SEVERE THUNDERSTORM COMPLEX MAY DEVELOP
SATURDAY AFTERNOON IN CENTRAL NORTH DAKOTA...THEN MOVE THROUGH THE
REGION THEREAFTER. THE MAIN THREAT WILL BE LARGE HAIL AND DAMAGING
WINDS...ALONG WITH ISOLATED TORNADOES SATURDAY AFTERNOON AND EVENING
IN EASTERN NORTH DAKOTA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED TODAY THROUGH SATURDAY.

DK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
142 AM CDT FRI JUN 25 2010

NDZ014-015-026-250715-
BENSON ND-NELSON ND-RAMSEY ND-
142 AM CDT FRI JUN 25 2010

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN NELSON...SOUTHERN RAMSEY
AND EASTERN BENSON COUNTIES UNTIL 215 AM CDT...

AT 140 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 8 MILES EAST OF DEVILS LAKE...MOVING TO THE EAST AT 40
MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THE STORM.

THE STORM WILL BE NEAR...
SOUTHAM AND DOYON AROUND 150 AM CDT.
LAKOTA AROUND 205 AM CDT.

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

HOPPES

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
333 AM CDT FRI JUN 25 2010

MNZ001-002-015-250915-
EAST POLK MN-NORMAN MN-WEST POLK MN-
333 AM CDT FRI JUN 25 2010

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN POLK AND NORTHEASTERN
NORMAN COUNTIES UNTIL 415 AM CDT...

AT 331 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 12 MILES NORTHEAST OF HALSTAD...OR 35 MILES SOUTHEAST OF
GRAND FORKS...MOVING TO THE EAST AT 30 MPH.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THE STORM.

THE STORM WILL BE NEAR...
LOCKHART AROUND 340 AM CDT.
BELTRAMI AROUND 345 AM CDT.
FERTILE AND FLAMING AROUND 405 AM CDT.
RINDAL...RANUM AND MAPLE BAY AROUND 415 AM CDT.

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

G2

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
339 AM CDT FRI JUN 25 2010

NDZ038-250945-
BARNES ND-
339 AM CDT FRI JUN 25 2010

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL BARNES COUNTY UNTIL 445
AM CDT...

AT 336 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 17 MILES NORTHEAST OF JAMESTOWN...MOVING TO THE EAST AT
50 MPH.

HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THE STORM...ALONG WITH FREQUENT LIGHTNING.

THE STORM WILL BE NEAR...
SANBORN AND ROGERS AROUND 345 AM CDT.
BALD HILL DAM AROUND 355 AM CDT.
VALLEY CITY AROUND 400 AM CDT.
ORISKA AROUND 410 AM CDT.

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

HOPPES

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
407 AM CDT FRI JUN 25 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0404 AM     TSTM WND GST     VALLEY CITY             46.92N 98.01W
06/25/2010  M60 MPH          BARNES             ND   AWOS

&&

DK

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
434 AM CDT FRI JUN 25 2010

MNZ022-023-251000-
MAHNOMEN MN-SOUTH CLEARWATER MN-
434 AM CDT FRI JUN 25 2010

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CLEARWATER AND
MAHNOMEN COUNTIES UNTIL 500 AM CDT...

AT 431 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM NEAR MAHNOMEN...OR 33 MILES NORTH OF DETROIT LAKES...
MOVING TO THE NORTHEAST AT 35 MPH.

HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THE STORM...ALONG
WITH HEAVY RAIN AND FREQUENT LIGHTNING.

THE STORM WILL BE NEAR...
BEAULIEU AROUND 440 AM CDT.
MAHKONCE AND NAYTAHWAUSH AROUND 450 AM CDT.
ISLAND_LAKE AROUND 455 AM CDT.
LOWER RICE LAKE...ROY LAKE AND PINE BEND AROUND 500 AM CDT.

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

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

G2

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
439 AM CDT FRI JUN 25 2010

MNZ022-023-027-028-251015-
EAST BECKER MN-MAHNOMEN MN-SOUTH CLEARWATER MN-WEST BECKER MN-
439 AM CDT FRI JUN 25 2010

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN BECKER...SOUTHWESTERN
CLEARWATER AND SOUTHEASTERN MAHNOMEN COUNTIES UNTIL 515 AM CDT...

AT 436 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
THUNDERSTORM 15 MILES NORTH OF DETROIT LAKES...MOVING TO THE EAST AT
45 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THE STORM...
ALONG WITH HEAVY RAIN.

THE STORM WILL BE NEAR...
TULABY LAKE AND MANY POINT LAKE AROUND 455 AM CDT.
BAD MEDICINE LAKE AROUND 505 AM CDT.

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

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

G2