Severe Thunderstorm Warning 258, NWS Grand Forks, ND

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
915 PM CDT SUN AUG 22 1999

...CONTINUED SEVERE WX IS FORECAST CONCERN...

BUSY NIGHT WITH LINE OF SVR TSRA MOVING THRU CWA. REPORTS OF LARGE
HAIL...STRONG WINDS...TORRENTIAL RAINS AND ONE ISOLATED TOR. SFC
TROF WITH FEW LO CENTERS NOW ALIGNED EAST OF RRV WITH IMPRESSIVE
MOISTURE POOLING ALONG IT (70+ TD/S AND H85 THETA RIDGE UP TO 340K).
BEHIND THIS IS ACTUAL CDFNT WITH SHIFT TO GUSTY NW WIND AND RAPID
DROP IN TD/S WITH FEW MORE ISOLD -TSRA. KMVX 88D SHOWS LINE FROM NEAR
ROX TO NEAR FSE EXTENDING SW TO ND/MN BORDER.

MSAS SHOWS SWATH OF LLVL CAA PUSHING SE THRU ND WITH WEAKER WAA EAST
OF RRV. OVERALL INSTABILITIES...MOISTURE...WAA PROFILE AND CONVERGENCE IN
MN JUST A NOTCH BELOW WHAT IT HAS BEEN IN ERN ND THRU EVE SO EXPECT
LESSENING SVR THREAT...ALTHO AS LINE MOVES THRU ISOLATED WIND/HAIL
EVENTS STILL POSSIBLE. IR LOOP INDICATING STRONG U/L CIRCULATION
SPINNING SE TOWARD KMOT WITH ADDL -SHRA REPORTED THIS EVENING IN
COOLING AIR ALOFT NEAR CYEN. WILL THEREFORE KEEP MENTION OF SCT SHRA
FOR OVERNIGHT PERIOD ESP IN NRN SECTIONS. O/W VARIABLE CLOUDS AS
VORT MAX GENERATES CLOUD COVER AS IT HEADS OUR WAY BEHIND TEMPORARY
CLEARING BEHIND CONVECTION.

WILL CANCEL WATCH FOR ND PART OF CWA AFTER THIS ISSUANCE AND KEEP IT
FOR MN SIDE ATTM. THEREFORE WILL UPDATE ND ZONES NOW AND BRIEFLY
HOLD OFF FOR MN AND UPDATE LATER AS LINE MOVES THRU. NO CHANGES
EXPECTED TO TEMPS/WINDS FOR OVERNIGHT PENDING LAST MINUTE REVIEW.

.FGF...SVR TSTM WATCH 652 UNTIL 11 PM CDT FOR CLAY...PENNINGTON...
KITTSON...POLK...RED LAKE...MARSHALL...NORMAN...ROSEAU...WILKIN.

SVR TSTM WATCH 653 UNTIL 1 AM CDT FOR REST OF MN CWA.

SOROKA

NDZ006>008-014>016-024-026>030-038-039-049-052-053-230225-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
915 PM CDT SUN AUG 22 1999

...SEVERE THUNDERSTORM WATCH CANCELLED FOR EASTERN NORTH
DAKOTA...

A TROF OF LOW PRESSURE THAT MOVED ACROSS THE STATE AND TRIGGERED
SEVERE THUNDERSTORMS HAS EDGED JUST EAST OF THE RED RIVER VALLEY. AS
SUCH...THE THREAT FOR SEVERE WEATHER IN EASTERN NORTH DAKOTA HAS
ENDED. A FEW MORE SCATTERED SHOWERS AND ANOTHER RUMBLE OF THUNDER
ARE STILL POSSIBLE DURING THE REST OF THE NIGHT AS AN UPPER
LEVEL DISTURBANCE SWINGS INTO EASTERN NORTH DAKOTA...BUT NO
ADDITIONAL SEVERE THUNDERSTORMS ARE EXPECTED.

SOROKA

NDZ006>008-014>016-024-026>030-038-039-049-052-053-230225-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
915 PM CDT SUN AUG 22 1999

...SEVERE THUNDERSTORM WATCH CANCELLED FOR EASTERN NORTH
DAKOTA...

A TROF OF LOW PRESSURE THAT MOVED ACROSS THE STATE AND TRIGGERED
SEVERE THUNDERSTORMS HAS EDGED JUST EAST OF THE RED RIVER VALLEY. AS
SUCH...THE THREAT FOR SEVERE WEATHER IN EASTERN NORTH DAKOTA HAS
ENDED. A FEW MORE SCATTERED SHOWERS AND ANOTHER RUMBLE OF THUNDER
ARE STILL POSSIBLE DURING THE REST OF THE NIGHT AS AN UPPER
LEVEL DISTURBANCE SWINGS INTO EASTERN NORTH DAKOTA...BUT NO
ADDITIONAL SEVERE THUNDERSTORMS ARE EXPECTED.

SOROKA

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