Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 223, NWS Grand Forks, ND

August 22, 1998Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 22, 1998, 10:30 PM CDT for Polk County, Minnesota. It was in force for 35 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 22, 1998, 10:30 PM CDT (03:30 UTC)
Expired: Aug 22, 1998, 11:05 PM CDT
In force: 35 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Polk County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 74 km from the middle of the area, began a volume at 03:33 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 22, 10:42 PM CDT	Hail 0.75	Eldred, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 22, 8:55 PM CDT, 1 hour 35 minutes earlier.

Area forecast discussion, Aug 22, 8:55 PM CDT, 1 hour 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
855 PM CDT SAT AUG 22 1998

PROBLEM FOR TNGT IS TSRA CHC ACRS CWA.  01Z SFC MAP SHOWS LOW N OF JMS
WITH TROF EXTENDING NORTH TO YWG...DRY LINE SOUTH TO PIR...AND WARM
FRONT EAST TO FAR.  DEW POINTS IN SE ND/WC MN ARE IN THE L-M70S WITH
M-U 60S IN REMAINDER OF CWA.  ADAP SHOWS BEST CONVEREGECE ALONG FRONT IN
SE ND WITH HIGHEST INSTABILITY AND WK CAP.  YET CELLS ARE HAVING A
TOUGH TIME ORGANIZING.  BELIEVE THERE ARE TWO REASONS FOR THIS...ONE IS
THAT CONVERGENCE APPEARS TO BE SHALLOW...BELOW 850 MB AS FLOW GOES WSW
ALOFT. MORE IMPORTANT...ABR SNDG SHOWS VERY DRY AIR ABOVE 5 KFT. SUSPECT
ENTRAINMENT OF VERY DRY AIR ABOVE BL INTO DEVELOPIONG CBS IS INHIBITING
DEVELOPMENT.  FARTHER NORTH...MSTR IS DEEPER AND THUS CONVECTION MORE
ORGANIZED ALONG CANADIAN BORDER.  WITH DIFFERENTIAL THERMAL ADVECTION
INCREASINGLY FAVORABLE FOR CONTINUED DESTABILIZATION AS UPR TROUGH
APPROACHES FROM WEST...AND SFC BOUNDARIES IN PLACE...EXPECT WIDELY SCT
TSRA TO CONTINUE THROUGH THE NIGHT.  AND WITH WB ZERO FALLING SMALL
HAIL POSSIBLE...ESP ACRS NRN CWA.  THEREFORE WL KEEP CONVECTION CHC
GOING ACRS THE ENTIRE CWA.

ONLY MINOR WORDING CHANGES EXPECTED IN ZONES.  UPDTED ZFP OUT BY 0230Z.
ANY QUESTIONS...COMMENTS...PLEASE CALL.

SCHUMACHER

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 22, 9:26 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	29 min
Aug 22, 9:54 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks	31 min
Aug 22, 10:26 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Traill	34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1998 Every severe thunderstorm warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; radar from the NEXRAD Level II archive.