Alert archive / Minnesota / Tornado Warnings in 1991

Tornado Warning 5, NWS Twin Cities, MN

May 30, 1991Sherburne County, Minnesota

NWS Twin Cities, MN issued this tornado warning at May 30, 1991, 4:15 PM CDT for Sherburne County, Minnesota. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 30, 1991, 4:15 PM CDT (21:15 UTC)
Expired
May 30, 1991, 4:45 PM CDT
In force
30 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Sherburne County, MN

What was reported inside it

TimeReportWhereRemark
May 30, 4:21 PM CDTTornado F0Sherburne, MN

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Minneapolis, MN (KSTC), launched 12:00Z, 9.3 hours before the alert went out and 67 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 1991-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 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 1991-05-30The 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
54 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1164 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
51 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 KSTC 302115
TORSTC
MNC141-302145-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA
415 PM CDT THU MAY 30 1991
 
THE NATIONAL WEATHER SERVICE IN ST CLOUD MINNESOTA   HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  445 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN CENTRAL MINNESOTA
 
   ...NORTHWESTERN SHERBURNE COUNTY
 
INCLUDING THE CITIES OF CLEAR LAKE AND SANTIAGO.
 
SINCE 410 PM CDT LAW ENFORCEMENT OFFICIALS HAVE REPORTED AT
LEAST FOUR TORNADOS ALONG THE MISSISSIPPI RIVER 8 MILES SOUTH
OF ST CLOUD. THESE TORNADOS ARE MOVING EAST AT 10 MPH.
 
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE QOF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.
 
NNNN

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 2:50 PM CDTTornado WarningMPXMeeker, Stearns25 min
May 30, 3:18 PM CDTTornado WarningMPXHennepin27 min
May 30, 3:50 PM CDTTornado WarningMPXSherburne, Stearns25 min
May 30, 4:25 PM CDTSevere Thunderstorm WarningMPXWashington35 min

Nearby

Tornado Warnings in Minnesota, 1991Every tornado warning in 1991Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.