Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 21, NWS Twin Cities, MN

May 28, 1991Brown County, Watonwan County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 28, 1991, 8:28 AM CDT for Brown County, Watonwan County, Minnesota. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
May 28, 1991, 8:28 AM CDT (13:28 UTC)
Expired
May 28, 1991, 9:15 AM CDT
In force
47 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Brown County, MN, Watonwan County, MN

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 1.5 hours before the alert went out and 118 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 1991-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1991-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
NaN m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
265 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 281327
SVRRST
MNC015-165-281415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
828 AM CDT TUE MAY 28 1991
 
THE NATIONAL WEATHER SERVICE IN ROCHESTER MN HAS ISSUED A
SEVERE THUNDERSTORM WARNING     EFFECTIVE UNTIL  915 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL MINNESOTA
 
   ...BROWN COUNTY...WATONWAN COUNTY
 
AT 8 20 AM WEATHER RADAR SHOWED A LINE OF SEVERE THUNDERSTORMS 75 MILES
WEST OF MANKATO MOVING EAST AT 35 MILES AN HOUR.
 
THIS WARNING INCLUDES THE CITIES OF ST JAMES...BUTTERFIELD...SLEEPY EYE
AND NEW ULM.
 
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WkIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE. REMEMBER SEVERE THUNDERSTORMS
CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE ADVANCE WARNING

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 3:12 AM CDTSevere Thunderstorm WarningMPXRenville33 min
May 28, 8:15 AM CDTSevere Thunderstorm WarningMPXRedwood, Renville45 min
May 28, 9:17 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Nicollet28 min
May 28, 9:19 AM CDTSevere Thunderstorm WarningMPXMcLeod, Sibley41 min
May 28, 9:19 AM CDTSevere Thunderstorm WarningMPXRenville22 min
May 28, 9:28 AM CDTSevere Thunderstorm WarningMPXLe Sueur, Waseca47 min
May 28, 9:47 AM CDTSevere Thunderstorm WarningMPXRice, Steele43 min
May 28, 10:10 AM CDTSevere Thunderstorm WarningMPXDodge, Goodhue20 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1991Every severe thunderstorm warning in 1991

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.