Alert archive / Minnesota / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 241, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 31, 1998, 6:23 PM CDT for Marshall County, Minnesota. It was in force for 32 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, 6:23 PM CDT (23:23 UTC)
- Expired
- Aug 31, 1998, 6:55 PM CDT
- In force
- 32 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Marshall County, MN
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 31, 6:30 PM CDT | Hail 0.75 | Stephen, 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 nearest sounding before it
International Fa, MN (KINL), launched 12:00Z, 11.4 hours before the alert went out and 227 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1998 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 116 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
274 WUUS1 KFAR 312326 RRA SVRFAR MNC089-312355- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 623 PM CDT MON AUG 31 1998 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTERN MARSHALL COUNTY IN NORTHWESTERN MINNESOTA * UNTIL 655 PM CDT * AT 620 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 8 MILES NORTH OF STEPHEN...OR 35 MILES NORTH OF GRAND FORKS. THE STORM WAS MOVING SOUTHEAST AT 20MPH. DIME SIZE HAIL WAS OBSERVED IN KENNEDY FROM 605 TO 610 PM. * THE SEVERE THUNDERSTORM WILL BE NEAR... STEPHEN BY 635 PM ARGYLE BY 645 PM ENGLUND BY 635 PM FLORTON BY 635 PM REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED WARNING. KENNEDY &&
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, 3 hours earlier.
Area forecast discussion, Aug 31, 3:23 PM CDT, 3 hours 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
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 4:15 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 35 min |
| Aug 31, 4:36 PM CDT | Severe Thunderstorm Warning | FGF | Mahnomen | 34 min |
| Aug 31, 4:52 PM CDT | Severe Thunderstorm Warning | FGF | Kittson | 33 min |
| Aug 31, 5:37 PM CDT | Severe Thunderstorm Warning | FGF | Kittson | 33 min |
| Aug 31, 6:07 PM CDT | Severe Thunderstorm Warning | FGF | Kittson | 33 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1998Every 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; the sounding from the Mesonet's radiosonde archive.