Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 189, NWS Twin Cities, MN

August 3, 1997Kanabec County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 1997, 9:51 PM CDT for Kanabec County, Minnesota. It was in force for 59 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, 9:51 PM CDT (02:51 UTC)
Expired
Aug 3, 1997, 10:50 PM CDT
In force
59 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Kanabec County, MN

The radar

The Minneapolis radar (KMPX), 124 km from the middle of the area, began a volume at 02:50 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
Aug 3, 9:53 PM CDTHail 0.75Woodland, 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, 2.9 hours before the alert went out and 124 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, Minneapolis, MN at 00:00Z on 1997-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1028 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, Minneapolis, MN at 00:00Z on 1997-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.1939587897Sfc1 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
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

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 040253 RRA
SVRMSP
MNC065-040350-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
951 PM CDT SUN AUG 3 1997

* SEVERE THUNDERSTORM WARNING FOR
  KANABEC COUNTY - EAST CENTRAL MINNESOTA

* UNTIL 1050 PM CDT
 
* SOME LOCATIONS AFFECTED
    WOODLAND
    WARMAN
    MORA
    KNIFE LAKE

* AT 950 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH LARGE
  HAIL JUST SOUTH OF MCGRATH OR ABOUT 25 MILES NORTHWEST OF
  HINCKLEY.  THE STORM WAS MOVING SOUTH AT 30 MPH.

THIS IS A DANGEROUS STORM...WITH LARGE HAIL.  STAY INDOORS AWAY
FROM WINDOWS.

JJ

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 9:36 PM CDTSevere Thunderstorm WarningMPXTodd64 min
Aug 3, 11:22 PM CDTSevere Thunderstorm WarningMPXStearns, Todd63 min
Aug 4, 12:01 AM CDTSevere Thunderstorm WarningMPXSherburne34 min
Aug 4, 12:34 AM CDTSevere Thunderstorm WarningMPXHennepin, Wright41 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.