Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 86, NWS Twin Cities, MN

July 24, 1987Chisago County, Minnesota; Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 24, 1987, 12:12 AM CDT for Chisago County, Minnesota; Polk County, Wisconsin. It was in force for 33 min.

The area

The counties it named.

The facts

Issued: Jul 24, 1987, 12:12 AM CDT (05:12 UTC)
Expired: Jul 24, 1987, 12:45 AM CDT
In force: 33 min
Issued by: NWS Twin Cities, MN
Area: Whole counties

Counties Chisago County, MN, Polk County, WI

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, 5.2 hours before the alert went out and 101 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1899 J/kg
Mixed-layer CIN: -131 J/kg
Mixed-layer LCL: 812 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 303 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 240512
SVRMSP
MNC025-WIC095-240545-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
1212 AM CDT FRI JUL 24 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1245 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

EAST CENTRAL MINNESOTA...
 EASTERN CHISAGO
WEST CENTRAL WISCONSIN...
 SOUTHERN POLK


AT.....1205 AM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER
EXTREME NORTHEAST WASHINGTON COUNTY NEAR FOREST LAKE IN EAST
CENTRAL MINNESOTA.

THIS STORM HAS A HISTORY OF PRODUCING GOLF BALL SIZE HAIL OR
BIGGER. GOLF BALL SIZE HAIL WAS REPORTED AT BLAINE AND IN LINO
LAKES JUST BEFORE MIDNIGHT.

CITIES IN THE PATH OF THIS STORM ARE TAYLORS FALLS IN CHISAGO
COUNTY OF MINNESOTA AND ST CROIX FALLS IN POLK COUNTY OF WEST
WISCONSIN.

REMEMBER SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60
MPH..DESTRUCTIVE HAIL..DEADLY LIGHTNING AND VERY HEAVY RAIN. ALSO
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH
LITTLE OR NO ADVANCE WARNING..SO BE ON THE LOOKOUT AND BE PREPARED
TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED.

JHM/RJN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:01 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	29 min
Jul 23, 7:21 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin, Ramsey, Washington	54 min
Jul 23, 7:29 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Ramsey	31 min
Jul 23, 7:57 PM CDT	Tornado Warning	MPX	Anoka, Dakota, Hennepin, Ramsey	33 min
Jul 23, 8:33 PM CDT	Severe Thunderstorm Warning	MPX	Washington	57 min
Jul 23, 8:33 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Dakota, Hennepin, Scott	57 min
Jul 23, 8:33 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey	57 min
Jul 23, 8:35 PM CDT	Severe Thunderstorm Warning	MPX	Yellow Medicine	55 min
Jul 23, 8:57 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	53 min
Jul 23, 9:27 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet	48 min
Jul 23, 9:46 PM CDT	Flash Flood Warning	MPX	Anoka, Dakota, Hennepin, Ramsey, Washington	3 hr
Jul 23, 9:46 PM CDT	Flash Flood Warning	MPX	Carver, Scott	3 hr
Jul 23, 11:51 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Ramsey, Washington	34 min
Jul 24, 12:03 AM CDT	Severe Thunderstorm Warning	MPX	Fillmore, Olmsted, Winona	57 min
Jul 24, 12:50 AM CDT	Flash Flood Warning	MPX	Carver, Hennepin, Scott	2 hr
Jul 24, 12:50 AM CDT	Flash Flood Warning	MPX	Anoka, Dakota, Ramsey, Washington	2 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987 Severe Thunderstorm Warnings in Wisconsin, 1987 Every severe thunderstorm warning in 1987

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.