Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 49, NWS Grand Forks, ND

June 24, 1997Polk County, Minnesota

NWS Grand Forks, ND issued this severe thunderstorm warning at Jun 24, 1997, 12:04 AM CDT for Polk County, Minnesota. It was in force for 26 min. 2 reports 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 24, 1997, 12:04 AM CDT (05:04 UTC)
Expired
Jun 24, 1997, 12:30 AM CDT
In force
26 min
Issued by
NWS Grand Forks, ND
Area
Whole counties

County Polk County, MN

What was reported inside it

TimeReportWhereRemark
Jun 24, 12:10 AM CDTHail 1Mentor, MN
Jun 24, 12:40 AM CDTHail 0.75Maple Bay, 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 23, 11:15 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 5.1 hours before the alert went out and 246 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 1997-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 141 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 1997-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 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
141 J/kg
Mixed-layer CIN
-442 J/kg
Mixed-layer LCL
601 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
180 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

379 
WUUS1 KFAR 240505 RRA
SVRFAR
MNC119-240530-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
1204 AM CDT TUE JUN 24 1997
 
THE NATIONAL WEATHER SERVICE IN EASTERN ND/GRAND FORKS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1230 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTHWEST MINNESOTA
 
   ...SOUTHERN POLK COUNTY
 
AT 1205 AM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 35 MILES
SOUTHEAST OF GRAND FORKS...OR 5 MILES SOUTHWEST OF MENTOR...MOVING EAST
AT 25 MPH.  TOWNS IN THE PATH INCLUDE MENTOR AND ERSKINE.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND OVER 57 MPH...HAIL
3/4 INCH IN DIAMETER OR LARGER...TORNADOES...DEADLY
LIGHTNING...AND VERY HEAVY RAIN.  MOVE TO A SMALL INTERIOR
ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.
 
RA

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 23, 10:45 PM CDTSevere Thunderstorm WarningFGFPolk30 min
Jun 23, 11:34 PM CDTSevere Thunderstorm WarningFGFPolk26 min
Jun 24, 12:30 AM CDTSevere Thunderstorm WarningFGFPolk30 min
Jun 24, 4:34 AM CDTFlash Flood WarningFGFClearwater, Polk3 hr

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.