Alert archive / Minnesota / Tornado Warnings in 1988

Tornado Warning 5, NWS Twin Cities, MN

July 29, 1988Isanti County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 29, 1988, 7:25 PM CDT for Isanti County, Minnesota. It was in force for 5 min.

The area

The counties it named.

The facts

Issued
Jul 29, 1988, 7:25 PM CDT (00:25 UTC)
Expired
Jul 29, 1988, 7:30 PM CDT
In force
5 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

County Isanti 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, 0.4 hours before the alert went out and 83 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 1988-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3828 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 1988-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.19395878Sfc1 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
3828 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1155 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 300025
TORMSP
MNC059-300115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
725 PM CDT FRI JUL 29 1988

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE EAST CENTRAL PART OF MINNESOTA
      NORTHERN ISANTI

AT 705 PM CDT..RADAR INDICATED A POSSIBLE TORNADO OVER THE CITY
OF CAMBRIDGE..IN NORTHERN ISANTI COUNTY. CAMBRIDGE IS 48 MILES
NORTH OF DOWNTOWN MINNEAPOLIS.

THIS IS A DANGEROUS STORM SITUATION.  ACT QUICKLY.  IF YOU ARE IN
THE PATH OF A TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE.
OTHERWISE..GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR
POSSIBLE.  AVOID WINDOWS.  ABANDON CARS AND MOBILE HOMES FOR A
REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

HARRISON

What forecasters said that day

The local office's own words before this tornado 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, Jul 29, 4:45 PM CDT, 2 hours 40 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
445 PM CDT FRI JUL 29 1988

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM CDT...
   FOR SOUTHWEST THROUGH NORTHEAST MINNESOTA...ALONG WITH
   NORTHWEST WISCONSIN...

AT 430 PM CDT...A BAND OF SCATTERED SHOWERS AND THUNDERSTORMS HAD
DEVELOPED ACROSS NORTHEAST MINNESOTA SINCE 330 PM CDT.

THIS NARROW BAND OF THUNDERSTORMS WAS LOCATED FROM 5 MILES WEST OF
CLOQUET..TO JUST NORTHEAST OF ELY..IN NORTHEAST MINNESOTA. POSSIBLY
HEAVY RAIN WAS FALLING NEAR THE TOWN OF CROMWELL.

MOVEMENT WAS EAST AT 25 MILES AN HOUR.

ANOTHER SMALL AREA OF SHOWERS AND A FEW THUNDERSTORMS HAD ALSO
DEVELOPED ACROSS THE SOUTHWEST CORNER OF MINNESOTA..FROM 5 MILES
NORTH OF MARSHALL..TO 5 MILES EAST OF WILLMAR.

MOVEMENT WAS EAST AT 25 MILES AN HOUR.

THESE SHOWERS AND THUNDERSTORMS WERE RAPIDLY DEVELOPING ALONG AN
APPROACHING COLD FRONT. AT 3 PM CDT..THIS FRONTAL SYSTEM
EXTENDED FROM NEAR ELY IN NORTHEAST MINNESOTA..ACROSS CENTRAL
MINNESOTA..TO SOUTH OF ALEXANDRIA..THEN INTO WESTERN SOUTH DAKOTA.

IF THREATENING WEATHER APPROACHES YOUR AREA..SEEK SHELTER.
SJC
Special weather statement, Jul 29, 5:16 PM CDT, 2 hours 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
515 PM CDT FRI JUL 29 1988

...SEVERE THUNDERSTORM WATCH IN CENTRAL MINNESOTA UNTIL 10PM CDT...

NO SEVERE WEATHER HAS BEEN REPORTED IN CENTRAL MINNESOTA THIS
AFTERNOON BUT A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM
CDT. AT 510 PM CDT A VERY STRONG THUNDERSTORM WITH HEAVY RAIN AND
POSSIBLY SOME HAIL WAS LOCATED IN BENTON COUNTY 10 MILES NORTHWEST OF
FOLEY MINNESOTA OR 20 MILES NORTHEAST OF ST. CLOUD. THIS STORM WAS
MOVING EAST AT 25 MPH.

A SIGNIFICANT DANGER WITH ANY THUNDERSTORM IS LIGHTNING. BOATERS
SHOULD GET OFF THE LAKE...GOLFERS HEAD TO THE CLUB HOUSE...BALL
PLAYERS MOVE OFF THE DIAMONDS...ANY ONE OUTSIDE SHOULD MOVE INSIDE
UNTIL THE STORM PASSES OUT OF THE AREA.

WDV
Special weather statement, Jul 29, 5:51 PM CDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
549 PM CDT FRI JUL 29 1988

...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 10 PM CDT...
   FOR SOUTHWEST THROUGH NORTHEAST MINNESOTA...ALONG WITH
   NORTHWEST WISCONSIN...

AT 530 PM CDT...AN AREA OF SCATTERED SHOWERS AND THUNDERSTORMS WERE
LOCATED ACROSS NORTHEAST..EAST CENTRAL..CENTRAL..AND SOUTHWEST MINNESOTA.
THESE THUNDERSTORMS HAD INCREASED..BOTH IN INTENSITY AND IN AREAL
COVERAGE SINCE 430 PM.

THIS AREA WAS LOCATED 20 MILES TO EITHER SIDE OF A LINE FROM THE DULUTH-
TWO HARBORS AREA..TO MCGRATH..THEN THROUGH THE TOWNS OF MORA AND FOLEY..
THROUGH ST CLOUD..TO SOUTH OF WILLMAR..THEN STRETCHED SOUTH WEST TO
JUST NORTH OF MARSHALL.

MOVEMENT WAS EAST AT 20 MILES AN HOUR.
.
ONE OF THESE THUNDERSTORMS PRODUCED 65 MPH WIND GUSTS AS IT PASSED
THROUGH THE TOWN OF CLOQUET..IN NORTHEAST MINNESOTA..JUST SOUTHWEST
OF DULUTH. ANOTHER THUNDERSTORM WAS DEPOSITING MARBLE SIZE HAIL AND
HEAVY RAIN IN THE FOLEY AND ST CLOUD AREA..ACROSS CENTRAL MINNESOTA.

THESE THUNDERSTORMS HAVE HAD A HISTORY OF STRONG GUSTY WINDS..HEAVY
RAIN..AND HAIL. LIGHTNING IS ANOTHER PROBLEM WITH THESE THUNDERSTORMS
AS THEY CONTINUE THEIR PASSAGE EASTWARD ACROSS MINNESOTA.

SHOULD SEVERE WEATHER APPROACH YOUR AREA..TAKE COVER.
SJC
Special weather statement, Jul 29, 6:33 PM CDT, 52 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
630 PM CDT FRI JUL 29 1988

...THUNDERSTORMS APPRAOCHING THE TWIN CITIES METROPOLITAN AREA...

A LINE OF THUNDERSTORMS WITH HEAVY RAIN AND HAIL LOCATED JUST NORTH
OF THE TWIN CITIES HAS BEEN MOVING SLOWLY SOUTHEAST.  THIS LINE OF
THUNDERSTORMS IS EXPECTED PASS THROUGH THE METROPOLITAN AREA THIS
EVENING.  GUSTY WINDS..HAIL AND HEAVY RAIN ARE EXPECTED TO REACH
WRIGHT COUNTY AND ISANTI COUNTIES JUST TO THE NORTH AND NORTHWEST OF
THE TWIN CITIES BY 700 PM.  THE MOVEMENT OF THESE THUNDERSTORMS SHOULD
BRING THEN ACROSS ANOKA COUNTY AND INTO NORTHERN HENNEPIN COUNTY BY
800 PM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR A LARGE SECTION OF
MINNESOTA INCLUDING THE TWIN CITIES UNTIL 1000 PM.  THOSE OURDOORS
THIS EVENING SHOULD BE PREPARED TO MOVE TO A PLACE OF SAFETY.  ALLOW
PLENTY OF TIME TO GET OFF AREA LAKES.  KEEP AN EYE ON THE SKY AND
LISTEN FOR LATVER STATEMENTS AND POSSIBLE WARNINGS.
WJH
Local storm report, Jul 29, 7:15 PM CDT, 10 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST. CLOUD MN
710 PM CDT FRI JUL 29 1988

...ATTN SELS...PRELIMINARY STORM REPORT FROM 29 JUL 1988...

540 PM CDT  1/2 INCH HAIL IN CITY OF ST. CLOUD.
550 PM CDT  GOLF BALL SIZE HAIL AT MILACA IN MILLE LACS COUNTY...
            28 MILES NORTHEAST OF ST. CLOUD.
605 PM CDT  GOLF BALL SIZE HAIL AT 5 MILES EAST OF MILACA.
605 PM CDT  3/4 INCH HAIL 7 MILES EAST OF ST. CLOUD IN BENTON COUNTY.
625 PM CDT  3/4 INCH HAIL AT LITCHFIELD MINNESOTA IN MEEKER COUNTY...
            35 MILES SOUTHWEST OF ST. CLOUD.
614-632 PM CDT  CONTINOUS HAIL AT THE ST. CLOUD NATIONAL WEATHER
            SERVICE OFFICE.  NUMEROUS STONES 1 INCH.
545-6 PM CDT PUBLIC REPORT OF HEAVY HAIL SHOWER 8 MILES SOUTH OF ST.
             CLOUD.  SEVERAL CHUNKS OF 3 INCH SIZE.

FRASER

Nearby

Tornado Warnings in Minnesota, 1988Every tornado warning in 1988Tornadoes in 1988

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.