Alert archive / Minnesota / Severe Thunderstorm Warnings in 1989

Severe Thunderstorm Warning 72, NWS Twin Cities, MN

August 13, 1989Chisago County, Isanti County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 13, 1989, 7:03 PM CDT for Chisago County, Isanti County, Minnesota. It was in force for 42 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
Aug 13, 1989, 7:03 PM CDT (00:03 UTC)
Expired
Aug 13, 1989, 7:45 PM CDT
In force
42 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Chisago County, MN, Isanti County, MN

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Aug 13, 7:50 PM CDTHail 1Isanti, 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 00:00Z, 0.1 hours before the alert went out and 85 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 1989-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 886 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 1989-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 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
886 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1848 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
57 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 KMSP 140005
SVRMSP
MNC025-059-140045-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
703 PM CDT SUN AUG 13 1989
 
THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  745 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN EAST CENTRAL MINNESOTA
          ...SOUTHERN CHISAGO...SOUTHEASTERN ISANTI
 
AT 655 PM CDT THIS SUNDAY..THE PUBLIC REPORTED 1 INCH HAIL AT
CAMBRIDGE IN ISANTI COUNTY..ABOUT 30 MILES NORTH OF DOWNTOWN
MINNEAPOLIS. WEATHER RADAR INDICATES SOUTHEAST MOVEMENT ON THIS SEVERE
THUNDERSTORM AT 15 MILES PER HOUR WHICH WOULD CARRY IT TO CENTER CITY
AND TAYLOR FALLS IN SOUTHEAST CHISAGO COUNTY BY 740 PM CDT
THIS SUNDAY EVENING.
 
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. REMEMBER SEVERE THUNDERSTORMS
CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE ADVANCE WARNING
 
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 TH8E LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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 13, 5:25 PM CDT, 1 hour 38 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
515 PM CDT SUN AUG 13 1989

...SEVERE THUNDERSTORM WATCH FOR WEST CENTRAL MINNESOTA TILL 10PM...
...THUNDERSTORMS DEVELOPING OVER CENTRAL MINNESOTA...

AT 500 PM CDT RADAR SHOWED AN AREA OF THUNDERSTORMS DEVELOPING FROM
SOUTH OF DULUTH THROUGH THE ST CLOUD AREA. SOME OF THESE STORMS HAVE
PRODUCED BRIEF HEAVY RAINS...SMALL HAIL AND FREQUENT LIGHTNING. THESE
THUNDERSTORMS WERE MOVING SOUTHEAST AT 15 TO 25 MPH.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR WEST CENTRAL MINNESOTA
UNTIL 10 PM CDT. NO SEVERE WEATHER HAS BEEN REPORTED IN MINNESOTA...
HOWEVER...SEVERE THUNDERSTORMS HAVE BEEN OCCURRING IN EASTERN SOUTH
DAKOTA AND ARE MOVING TOWARDS WEST CENTRAL MINNESOTA.

YOUNG
Special weather statement, Aug 13, 6:16 PM CDT, 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
615 PM CDT SUN AUG 13 1989

...THUNDERSTORMS CONTINUE TO DEVELOP OVER CENTRAL AND EAST CENTRAL
MINNESOTA...AND MOVING INTO WEST CENTRAL WISCONSIN...

AT 610 PM CDT...THE LEADING EDGE OF A A LINE OF SHOWERS AND THUNDERSTORMS
EXTENDED FROM 25 MILES SOUTH OF ST. CLOUD...TO JUST WEST OF GRANTSBURG
WISCONSIN...AND ON TO 30 MILES EAST OF GRANTSBURG.  THE LEADING EDGE
ACTUALLY STRETCHED FROM NEAR ANNANDALE...TO NEAR CAMBRIDGE...TO JUST
SOUTHEAST OF PINE CITY...ON TO NEAR SHELL LAKE WISCONSIN.

SOME OF THESE STORMS MAY PRODUCE HEAVY RAINS...SMALL HAIL...GUSTY
WIND...AND FREQUENT LIGHTNING STRIKES.

MOVEMENT OF THE STORMS WAS SOUTHEAST AT 15 MILES AN HOUR.  PEOPLE IN
THESE AREAS SHOULD GET INSIDE...DUE TO THE FREQUENT LIGHTNING AND
GUSTY WINDS.  ANY ONE OF THESE STORMS MAY PRODUCE BRIEF WIND GUSTS
TO 50 MILES AN HOUR...SO LISTEN FOR LATER STATEMENTS.

TDK
Special weather statement, Aug 13, 6:42 PM CDT, 21 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
630 PM CDT SUN AUG 13 1989

...SEVERE THUNDERSTORM WATCH FOR WEST CENTRAL MINNESOTA TILL 10PM...
...THUNDERSTORMS CONTINUE TO DEVELOP OVER CENTRAL MINNESOTA...

AT 630 PM CDT RADAR SHOWED AN AREA OF THUNDERSTORMS OVER CENTRAL
MINNESOTA WITH THE STRONGEST STORMS IN A LINE EXTENDING FROM PINE
CITY TO ST CLOUD TO ALEXANDRIA. THESE STRONG THUNDERSTORMS WERE
MOVING EAST SOUTHEAST AT 15 MPH. BRIEF HEAVY RAINS...SMALL HAIL
AND WIND GUSTS TO 40 MPH HAVE BEEN REPORTED WITH THESE STORMS.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR WEST CENTRAL MINNESOTA
UNTIL 10 PM CDT. NO SEVERE WEATHER HAS BEEN REPORTED IN MINNESOTA...
HOWEVER...SEVERE THUNDERSTORMS CONTINUE TO DEVELOP IN EASTERN SOUTH
DAKOTA. THESE SEVERE THUNDERSTORMS WERE MOVING TO THE SOUTHEAST AT
25 MPH AND HAVE NOT YET MOVED INTO MINNESOTA.

YOUNG

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 13, 8:05 PM CDTSevere Thunderstorm WarningMPXWright40 min
Aug 13, 8:19 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin46 min
Aug 13, 9:01 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin59 min

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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.