Alert archive / Minnesota / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 79, NWS Twin Cities, MN

July 8, 1990Swift County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 8, 1990, 1:07 AM CDT for Swift County, Minnesota. It was in force for 53 min.

The area

The counties it named.

The facts

Issued
Jul 8, 1990, 1:07 AM CDT (06:07 UTC)
Expired
Jul 8, 1990, 2:00 AM CDT
In force
53 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Swift 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, 6.1 hours before the alert went out and 170 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 1990-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1386 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 1990-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 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
1386 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
726 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
268 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTC 080618 COR
SVRSTC
MNC023-151-080700-

BULLETIN - IMMEDIATE BROADCAST REQUESTED...CORRECT RADAR TIME...
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST CLOUD MN
107 AM CDT SUN JUL 8 1990

THE NATIONAL WEATHER SERVICE IN ST CLOUD HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  200 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...

IN WEST CENTRAL MINNESOTA
          ...CHIPPEWA...SWIFT

INCLUDING THE CITIES OF BENSON...MURDOCK AND MILAN.

AT 1250 AM CDT RADAR SHOWED A SEVERE THUNDERSTORM JUST EAST OF
APPLETON WHICH IS 45 MILES WEST OF WILLMAR. THIS THUNDERSTORM WAS
MOVING EAST AT 30 MPH.


IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...>LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 1:07 AM CDTSevere Thunderstorm WarningMPXChippewa23 min
Jul 8, 2:09 AM CDTSevere Thunderstorm WarningMPXMorrison51 min
Jul 8, 4:28 AM CDTSevere Thunderstorm WarningMPXSibley47 min
Jul 8, 4:49 AM CDTSevere Thunderstorm WarningMPXCarver41 min
Jul 8, 5:00 AM CDTSevere Thunderstorm WarningMPXHennepin, Scott60 min
Jul 8, 5:14 AM CDTSevere Thunderstorm WarningMPXRamsey, Washington46 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.