Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 229, NWS Twin Cities, MN

October 6, 1997Yellow Medicine County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Oct 6, 1997, 4:20 AM CDT for Yellow Medicine 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
Oct 6, 1997, 4:20 AM CDT (09:20 UTC)
Expired
Oct 6, 1997, 4:55 AM CDT
In force
35 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Yellow Medicine County, MN

The radar

The Sioux Falls radar (KFSD), 143 km from the middle of the area, began a volume at 09:20 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
Oct 6, 4:40 AM CDTThunderstorm Wind 50Clarkfield, MNTrees blown down. Estimated windspeed.

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, 9.3 hours before the alert went out and 180 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 1997-10-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1997-10-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2930 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
80 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.

871 
WUUS1 KMSP 060926
SVRMSP
MNC173-060950-

BULLETIN - IMMEDIATE BROADCAST REQUESTED...CORRECTED FOR TOWN NAME...
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
420 AM CDT MON OCT 6 1997


* SEVERE THUNDERSTORM WARNING FOR
  YELLOW MEDICINE COUNTY - SOUTHWESTERN MINNESOTA

* UNTIL 455 AM CDT

* SOME LOCATIONS AFFECTED
    CLARKFIELD
    HENLEY FALLS
    GRANITE FALLS
    ECHO

* AT 415 AM CDT LOCAL LAW ENFORCEMENT REPORTED A SEVERE STORM WITH
  LARGE HAIL NEAR CANBY OR 15 MILES SOUTHWEST OF MONTEVIDEO.  THE
  STORM WAS MOVING EAST AT 40 MPH.

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


CARLYON


&

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 6, 4:48 AM CDTSevere Thunderstorm WarningMPXChippewa, Renville, Yellow Medicine62 min
Oct 6, 5:51 AM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley54 min
Oct 6, 6:43 AM CDTSevere Thunderstorm WarningMPXCarver, Scott62 min
Oct 6, 7:19 AM CDTSevere Thunderstorm WarningMPXDakota41 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.