Alert archive / Minnesota / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 71, NWS Twin Cities, MN

August 4, 1989Mower County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 4, 1989, 8:32 PM CDT for Mower County, Minnesota. It was in force for 43 min.

The area

The counties it named.

The facts

Issued
Aug 4, 1989, 8:32 PM CDT (01:32 UTC)
Expired
Aug 4, 1989, 9:15 PM CDT
In force
43 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Mower 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, 1.5 hours before the alert went out and 147 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 1989-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 1989-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
4 J/kg
Mixed-layer CIN
-212 J/kg
Mixed-layer LCL
3541 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRST 050132
SVRRST
MNC099-050215-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
832 PM CDT FRI AUG 4 1989
 
THE NATIONAL WEATHER SERVICE IN ROCHESTER HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHEAST MINNESOTA
          ...MOWER
 
AT 825 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES EAST
OF AUSTIN MOVING TO THE EAST AT 25 MILES AN HOUR TOWARD GRAND MEADOW.
 
ALSO...AT 815 PM CDT...THE AUSTIN SHERIFF REPORTED MARBLE SIZE HAIL
AND VERY HEAVY RAIN.
 
THIS WARNING INCLUDES THE CITY OF GRAND MEADOW.
 
 
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 ROAED.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 4, 6:09 PM CDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
600 PM CDT FRI AUG 4 1989

   ...SEVERE THUNDERSTORM WATCH BEING CLEARED FOR DAKOTA COUNTY...

STRONG THUNDERSTORMS CONTINUE OVER PORTIONS OF SOUTH CENTRAL AND
SOUTHEAST MINNESOTA WHERE SEVERE THUNDERSTORM WATCH 656 WILL REMAIN
IN EFFECT. THIS AREA OF SEVERE WEATHER HAS SLOWLY SAGGED SOUTHWARD
DURING THER PAST SEVERAL HOURS AND IS PROJECTED TO CONTINUE THIS TREND.
THESE IMPROVING CONDITIONS HAVE PROMPTED THE TWIN CITIES FORECAST
OFFICE TO CLEAR THOSE PORTIONS OF THE SOUTHERN METROPOLITIAN AREA
FROM SEVERE THUNDERSTORM WATCH 656.
RND
Special weather statement, Aug 4, 7:11 PM CDT, 1 hour 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST. PAUL MN
705 PM CDT FRI AUG 4 1989

...NORTHERN PORTIONS OF SEVERE THUNDERSTORM WATCH 656 BEING CLEARED...

SEVERE WEATHER CONTINUES TO MOVE SOUTHWARD WITH THE BEST FOCUS REMAINING
OVER EXTREME SOUTHEAST AND SOUTH CENTRAL MINNESOTA. AS OF 700 PM CDT
THIS FRIDAY EVENING THE FOLLOWING COUNTIES HAVE BEEN CLEARED FROM SEVERE
THUNDERSTORM WATCH 656..WABASHA..GOODHUE..RICE AND LESEUR. THE .REMAINDER
OF SOUTH CENTRAL AND SOUTHEAST MINNESOTA WILL REMAIN UNDER THE WATCH
UNTIL 1100 PM CDT THIS FRIDAY EVENING UNLESS CLEARED.
RND

Nearby

Severe Thunderstorm Warnings in Minnesota, 1989Every severe thunderstorm warning in 1989

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.