Alert archive / Minnesota / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 120, NWS Twin Cities, MN

September 7, 1990Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 7, 1990, 6:14 AM CDT for Sibley County, Minnesota. It was in force for 31 min.

The area

The counties it named.

The facts

Issued
Sep 7, 1990, 6:14 AM CDT (11:14 UTC)
Expired
Sep 7, 1990, 6:45 AM CDT
In force
31 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Sibley County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 11.2 hours before the alert went out and 58 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 1990-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 584 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 1990-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -40 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
584 J/kg
Mixed-layer CIN
-72 J/kg
Mixed-layer LCL
1272 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
-40 m²/s²
0-3 km storm-relative helicity
-1 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 071114
SVRMSP
MNC143-071145-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
614 AM CDT FRI SEP 7 1990
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  645 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN CENTRAL MINNESOTA
          ...EASTERN SIBLEY
 
AT 610 AM CDT A SEVERE THUNDERSTORM WAS LOCATED NEAR GAYLORD ABOUT
25 MILES NORTH OF MANKATO IN SOUTH CENTRAL MINNESOTA.
 
LARGE HAIL AND DAMAGING WINDS ARE LIKELY WITH THIS STORM.
 
THE STORM WAS MOVING SOUTHEAST AT 45 MILES AN HOUR.
 
SOME CITIES IN THE PATH OF THIS INCLUDE...GAYLORD...HENDERSON...NEW
ROME AND GREEN ISLE.
 
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 3:52 AM CDTSevere Thunderstorm WarningMPXPope, Swift43 min
Sep 7, 4:15 AM CDTSevere Thunderstorm WarningMPXKandiyohi45 min
Sep 7, 4:53 AM CDTSevere Thunderstorm WarningMPXStearns67 min
Sep 7, 5:05 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker55 min
Sep 7, 6:32 AM CDTSevere Thunderstorm WarningMPXLe Sueur, Nicollet28 min
Sep 7, 7:23 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Waseca37 min
Sep 7, 3:36 PM CDTSevere Thunderstorm WarningMPXMartin39 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1990Every severe thunderstorm warning in 1990

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.