Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 242, NWS Grand Forks, ND

August 31, 1998Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 31, 1998, 8:19 PM CDT for Polk County, Minnesota. It was in force for 31 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 31, 1998, 8:19 PM CDT (01:19 UTC)
Expired: Aug 31, 1998, 8:50 PM CDT
In force: 31 min
Issued by: NWS Grand Forks, ND
Area: Whole counties

County Polk County, MN

What was reported inside it

Time	Report	Where	Remark
Aug 31, 8:45 PM CDT	Hail 0.75	Mc Intosh, 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 31, 3:23 PM CDT, 4 hours 56 minutes earlier.

Area forecast discussion, Aug 31, 3:23 PM CDT, 4 hours 56 minutes before

FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
250 PM CDT MON AUG 31 1998

FORECAST CHALLENGE TONIGHT WILL BE EARLY TSRA THREAT AND OVERNIGHT
MINS. DATA HAS BEEN SPARSE THIS SHIFT WITH GRIDDED DATA NOT YET
AVAILABLE...SAT DATA OLD AND SPORADIC. 18Z SFC MAP INDICATING COLD
FRONT FROM NEAR NE CORNER OF ND TO BETWEEN BIS AND DIK WITH ANOTHER WK
BOUNDARY/WARM FRONT FROM NEAR ROX TO BJI. CONVECTION WHICH PROPAGATED
FROM S MB INTO NW MN APPEARS TO BE FOLLOWING THE LATER BOUNDARY ACROSS
NW MN. INL SOUNDING ALSO INDICATED FAIRLY GOOD H8 WAA WHICH ALSO AIDED
IN SUSTAINING CONVECTION. FROM 12Z RUC SHORTWAVE AND JET DYNAMICS
PROGGED TO REMAIN N OF BORDER. ALSO LOW LEVEL MOIST SOMEWHAT IN
QUESTION AS AREA 12Z SOUNDINGS FAIRLY DRY RESULTING IN MAINLY ELEVATED
CONVECTION. SFC DEWPOINTS CONTINUE IN THE MID TO UPPER 50S WITH ISOLD
60 DEGREE READINGS AHEAD OF CF. H8 FLOW OF 20-30KTS GETS CUT OFF OVR
NEBRASKA SO AM NOT EXPECTING ANY SUSTAINED LOW LEVEL MOIST TRANSPORT.
AS A RESULT EXPECT ANY CONVECTION TO BE WIDELY SCATTERED/ISOLATED. AM
SLIGHTLY CONCERN ABOUT OUTFLOW BOUNDARY WHICH IS EVIDENT FROM KMVX-88D
AND VIS LOOP WHICH MAY INTERACT WITH APPROACHING COLD FRONT ACROSS
EASTERN ND EARLY THIS EVENING. ALSO ADAP INDICATING LI'S -4 TO -6 WITH
WK MOIST CONVERGENCE SO STILL FEEL SOME MENTION OF TSRA NEEDED EVEN
WITH LACK OF UPPER AIR SUPPORT. OTHERWISE CU FIELD HAS SHOWN A RECENT
DISSIPATING TREND. LATER THIS EVENING POST CFP CAA GETS GOING AND
CONTINUES OVERNIGHT INTO SECOND PERIOD. IMPRESSIVE DEWPOINTS IN THE MID
30S AS CLOSE AS SE SASK. WITH SFC GRADIENT AND SIG PRESS RISES MIXING
MAY HOLD TEMPS UP SOMEWHAT OVERNIGHT. WITH LACK OF GRIDDED DATA TO LOOK
AT FEEL GUIDAANCE TEMPS GOOD PLACE TO START. PRELIMINARY GUIDANCE FOR
COORDINATION ONLY.
FOR DVL...MOCLR. LOW 45 TO 50. NW WIND 10 TO 15 MPH.
GFK...ISOLD EARLY EVENING TSRA OTWS MOCLR. LOW 45 TO 50. WIND BECOMING
NW 10 TO 15 MPH.
FAR...ISOLD EARLY EVENING TSRA OTWS MOCLR. LOW AROUND 50. WIND BECOMING
NW 5 TO 15 MPH.
MN4-9>13-17
.TONIGHT...ISOLD EARLY EVENING TSRA OTWS CLEARING. LOW UPPER 40S TO
LOWER 50S. WIND BECOMING NW 10 TO 15 MPH.
MN22-24>27-32>40
.TONIGHT...AN ISOLD EARLY EVENING TSRA POSSIBLE OTHERWISE MOCLR. LOW
AROUND 50. WIND BECOMING NW 5 TO 15 MPH.
VOELKER

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.