Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 170, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 3, 1997, 9:12 PM CDT for Wadena County, Minnesota. It was in force for 33 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 3, 1997, 9:12 PM CDT (02:12 UTC)
- Expired
- Aug 3, 1997, 9:45 PM CDT
- In force
- 33 min
- Issued by
- NWS Grand Forks, ND
- Area
- Whole counties
County Wadena County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 207 km from the middle of the area, began a volume at 02:15 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 3, 9:30 PM CDT | Hail 0.75 | Aldrich, 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
Minneapolis, MN (KMPX), launched 00:00Z, 2.2 hours before the alert went out and 220 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
- 1028 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1282 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFAR 040212 RRA SVRFAR MNC159-040245- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 912 PM CDT SUN AUG 3 1997 THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 945 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN CENTRAL MINNESOTA ...SOUTHEASTERN WADENA COUNTY AT 912 PM...RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTH OF NIMROD OR 40 MILES NORTHWEST OF BRAINERD. THIS STORM IS MOVING SOUTHEAST AT 20 MPH. TOWNS IN THE PATH OF THIS STORM IS OYLEN AND CENTRAL. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WjARNING. GSF
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 3, 8:54 PM CDT, 18 minutes earlier.
Area forecast discussion, Aug 3, 8:54 PM CDT, 18 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 853 PM CDT SUN AUG 3 1997 KMVX 88D CONTINUES TO INDICATE -TSRA IN WEST CENTRAL MN AND THESE SHOULD DIMINISH WITH LOSS OF DAYTIME HEATING. ADAP SSW STREAMLINES SHOWS WEAK SFC TROF FROM LAKE OF THE WOODS COUNTY IN MN INTO SE ND. IN ADDITION...WV IMAGERY AND 21Z RUC INDICATED WEAK S/W EMBEDDED IN NW FLOW SET OFF EARLIER CONVECTION. EXP ECT A QUIET NIGHT AS SFC HIGH PRESSURE BUILDS IN FROM THE WEST. WITH LOW LEVEL DRYING...DO NOT EXPECT FOG FORMATION. WILL UPDATE ZONES TO CLEAN UP WORDING. GSF
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 10:47 PM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 43 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1997Every severe thunderstorm warning in 1997
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; radar from the NEXRAD Level II archive.