Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 92, NWS Grand Forks, ND

June 28, 1997Mahnomen County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 28, 1997, 2:40 AM CDT for Mahnomen 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
Jun 28, 1997, 2:40 AM CDT (07:40 UTC)
Expired
Jun 28, 1997, 3:15 AM CDT
In force
35 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Mahnomen County, MN

The radar

The Fargo/Grand Forks radar (KMVX), 116 km from the middle of the area, began a volume at 07:42 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

TimeReportWhereRemark
Jun 28, 2:45 AM CDTHail 0.75Island Lake, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 27, 10:45 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 7.7 hours before the alert went out and 233 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.

Skew-T log-pSkew-T log-p diagram, International Fa, MN at 00:00Z on 1997-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2313 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 00:00Z on 1997-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2313 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1650 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.5
Supercell composite
8.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

581 
WUUS1 KFAR 280741 RRA
SVRFAR
MNC087-280815-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
240 AM CDT SAT JUN 28 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  315 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN WEST CENTRAL MINNESOTA
 
   ...MAHNOMEN COUNTY
 
AT 240 AM CDT...DOPPLER WEATHER RADAR INDICATED A SEVERE THUNDERSTORM 40
MILES NORTH OF DETROIT LAKES...NEAR THE TOWN OF BEJOU...MOVING SOUTHEAST
AT 15 MPH. TOWNS IN THE PATH OF THIS STORM INCLUDE BEJOU.
 
WHEN THUNDERSTORMS ARE OCCURRING...MOVE INTO A STRONG BUILDING.
DONT USE TELEPHONES OR ELECTRICAL APPLIANCES AND STAY AWAY FROM
WINDOWS.
 
RA

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 7:04 PM CDTSevere Thunderstorm WarningFGFMarshall41 min
Jun 27, 7:27 PM CDTSevere Thunderstorm WarningFGFRoseau33 min
Jun 27, 7:32 PM CDTSevere Thunderstorm WarningFGFLake of the Woods28 min
Jun 27, 7:43 PM CDTSevere Thunderstorm WarningFGFMarshall47 min
Jun 27, 8:03 PM CDTSevere Thunderstorm WarningFGFBeltrami42 min
Jun 27, 8:49 PM CDTSevere Thunderstorm WarningFGFBeltrami26 min
Jun 27, 9:31 PM CDTSevere Thunderstorm WarningFGFBeltrami44 min
Jun 27, 10:11 PM CDTSevere Thunderstorm WarningFGFBeltrami49 min
Jun 27, 10:32 PM CDTSevere Thunderstorm WarningFGFMarshall28 min
Jun 27, 10:49 PM CDTSevere Thunderstorm WarningFGFClearwater26 min
Jun 27, 10:58 PM CDTSevere Thunderstorm WarningFGFBeltrami47 min
Jun 27, 11:15 PM CDTSevere Thunderstorm WarningFGFClearwater, Polk30 min
Jun 27, 11:48 PM CDTSevere Thunderstorm WarningFGFClearwater27 min
Jun 27, 11:54 PM CDTSevere Thunderstorm WarningFGFNorman36 min
Jun 28, 12:13 AM CDTSevere Thunderstorm WarningFGFClearwater, Mahnomen, Polk32 min
Jun 28, 12:32 AM CDTSevere Thunderstorm WarningFGFBeltrami, Hubbard28 min
Jun 28, 12:36 AM CDTSevere Thunderstorm WarningFGFNorman39 min
Jun 28, 12:44 AM CDTSevere Thunderstorm WarningFGFClearwater, Mahnomen, Polk31 min
Jun 28, 1:11 AM CDTFlash Flood WarningFGFClearwater, Mahnomen, Polk3 hr
Jun 28, 1:14 AM CDTSevere Thunderstorm WarningFGFClearwater, Mahnomen31 min
Jun 28, 1:29 AM CDTSevere Thunderstorm WarningFGFHubbard31 min
Jun 28, 1:45 AM CDTSevere Thunderstorm WarningFGFBecker30 min
Jun 28, 1:47 AM CDTSevere Thunderstorm WarningFGFNorman28 min
Jun 28, 2:13 AM CDTSevere Thunderstorm WarningFGFNorman32 min
Jun 28, 2:54 AM CDTSevere Thunderstorm WarningFGFBecker36 min
Jun 28, 3:29 AM CDTSevere Thunderstorm WarningFGFBecker31 min
Jun 28, 9:16 AM CDTSevere Thunderstorm WarningFGFOtter Tail29 min
Jun 28, 9:31 AM CDTSevere Thunderstorm WarningFGFWilkin44 min
Jun 28, 9:47 AM CDTSevere Thunderstorm WarningFGFOtter Tail28 min
Jun 28, 10:12 AM CDTSevere Thunderstorm WarningFGFWilkin48 min
Jun 28, 10:21 AM CDTSevere Thunderstorm WarningFGFOtter Tail54 min
Jun 28, 11:00 AM CDTFlash Flood WarningFGFOtter Tail4 hr
Jun 28, 11:27 AM CDTSevere Thunderstorm WarningFGFWilkin33 min
Jun 28, 12:21 PM CDTFlash Flood WarningFGFWilkin2 hr
Jun 28, 1:03 PM CDTSevere Thunderstorm WarningFGFOtter Tail27 min
Jun 28, 1:10 PM CDTSevere Thunderstorm WarningFGFWadena35 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.