Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 101, NWS Twin Cities, MN

July 27, 1987Steele County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 27, 1987, 6:52 PM CDT for Steele County, Waseca County, Minnesota. It was in force for 53 min.

The area

The counties it named.

The facts

Issued
Jul 27, 1987, 6:52 PM CDT (23:52 UTC)
Expired
Jul 27, 1987, 7:45 PM CDT
In force
53 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Steele County, MN, Waseca 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 12:00Z, 11.9 hours before the alert went out and 93 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 12:00Z on 1987-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1473 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 12:00Z on 1987-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 141 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
1473 J/kg
Mixed-layer CIN
-176 J/kg
Mixed-layer LCL
645 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
141 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRST 272352
SVRRST
MNC147-161-280045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
652 PM CDT MON JUL 27 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  745 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTH CENTRAL MINNESOTA
          ...WESTERN STEELE...WASECA
 
AT 645 PM CDT RADAR INDICATES A SEVERE THUNDERSTORM 24 MILES EAST OF
MANKATO MOVING SOUTH AT 20 MPH.M
 
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
Jul 27, 3:34 PM CDTTornado WarningMPXGoodhue26 min
Jul 27, 3:40 PM CDTTornado WarningMPXDakota20 min
Jul 27, 3:59 PM CDTTornado WarningMPXDakota31 min
Jul 27, 4:02 PM CDTTornado WarningMPXGoodhue28 min
Jul 27, 4:32 PM CDTTornado WarningMPXGoodhue, Rice43 min
Jul 27, 4:54 PM CDTSevere Thunderstorm WarningMPXDakota36 min
Jul 27, 5:14 PM CDTSevere Thunderstorm WarningMPXRice46 min
Jul 27, 5:53 PM CDTSevere Thunderstorm WarningMPXScott47 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987Every severe thunderstorm warning in 1987

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.