Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 242, NWS Twin Cities, MN

October 8, 1997Nicollet County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Oct 8, 1997, 11:43 PM CDT for Nicollet County, Sibley County, Minnesota. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 8, 1997, 11:43 PM CDT (04:43 UTC)
Expired
Oct 9, 1997, 12:30 AM CDT
In force
47 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Nicollet County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 68 km from the middle of the area, began a volume at 04:47 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Oct 8, 7:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.7 hours before the alert went out and 66 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 1997-10-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 239 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 1997-10-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 401 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
239 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
518 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
401 m²/s²
0-3 km storm-relative helicity
449 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

662 
WUUS1 KMSP 090444 RRA
SVRMSP
MNC103-143-090530-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1143 PM CDT WED OCT 8 1997


* SEVERE THUNDERSTORM WARNING FOR
  NICOLLET COUNTY - SOUTH CENTRAL MINNESOTA
  SIBLEY COUNTY - SOUTH CENTRAL MINNESOTA

* UNTIL 1230 AM CDT

* SOME LOCATIONS AFFECTED
    WINTHROP
    GAYLORD
    LAFAYETTE
    NICOLLET

* AT 1145 PM CDT DOPPLER RADAR INDICATED A LINE OF SEVERE STORMS
  BETWEEN GIBBON AND NEW ULM...OR 40 MILES NORTHWEST OF MANKATO.
  THE STORMS WERE MOVING NORTHEAST AT 50 MPH.

THESE ARE DANGEROUS STORMS WITH DAMAGING WINDS LIKELY.  STAY INDOORS
AWAY FROM WINDOWS.

MCBEATH PETERS

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 8, 7:56 PM CDTSevere Thunderstorm WarningMPXLac qui Parle, Yellow Medicine34 min
Oct 8, 8:25 PM CDTSevere Thunderstorm WarningMPXStevens, Swift50 min
Oct 8, 8:25 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville50 min
Oct 8, 8:25 PM CDTSevere Thunderstorm WarningMPXChippewa50 min
Oct 8, 9:07 PM CDTSevere Thunderstorm WarningMPXRedwood, Renville53 min
Oct 8, 9:07 PM CDTSevere Thunderstorm WarningMPXKandiyohi53 min
Oct 8, 11:15 PM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs60 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.