Alert archive / Minnesota / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 224, NWS Twin Cities, MN

September 8, 1997Hennepin County, Scott County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 8, 1997, 9:39 PM CDT for Hennepin County, Scott County, Minnesota. It was in force for 31 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
Sep 8, 1997, 9:39 PM CDT (02:39 UTC)
Expired
Sep 8, 1997, 10:10 PM CDT
In force
31 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Hennepin County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 5 km from the middle of the area, began a volume at 02:43 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
Sep 8, 9:45 PM CDTHail 1Savage, MN
Sep 8, 9:45 PM CDTThunderstorm Wind 50Deephaven, MNPower lines blown down. Similar damge in Orono. 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, 2.7 hours before the alert went out and 8 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 1997-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1255 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 1997-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 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
1255 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 090238 RRA
SVRMSP
MNC053-139-090310-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
939 PM CDT MON SEP 8 1997


* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN HENNEPIN COUNTY - EAST CENTRAL MINNESOTA
  NORTHERN SCOTT COUNTY - EAST CENTRAL MINNESOTA

* UNTIL 1010 PM CDT

* SOME LOCATIONS AFFECTED
    SHAKOPEE
    SAVAGE
    EDEN PRAIRIE
    BLOOMINGTON

* AT 935 PM CDT DOPPLER RADAR INDICATED A SEVERE STORM WITH
  DAMAGING WINDS NEAR EDEN PRAIRIE...OR ABOUT 15 MILES SOUTHWEST
  OF MINNEAPOLIS.  THE STORM WAS MOVING SOUTHEAST AT 35 MPH.

WIND GUSTS TO 54 MPH WERE REPORTED WITH THIS STORM AT FLYING CLOUD
AIRPORT IN EDEN PRAIRIE.

THIS IS A DANGEROUS STORM...WITH DAMAGING WINDS.  STAY INDOORS
AWAY FROM WINDOWS.

HAMEN

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.