Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 70, NWS Twin Cities, MN

July 23, 1987Washington County, Minnesota; Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 23, 1987, 2:08 PM CDT for Washington County, Minnesota; Saint Croix County, Wisconsin. It was in force for 52 min. 2 reports 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
Jul 23, 1987, 2:08 PM CDT (19:08 UTC)
Expired
Jul 23, 1987, 3:00 PM CDT
In force
52 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Washington County, MN, Saint Croix County, WI

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
Jul 23, 2:10 PM CDTHail 1St. Croix, WI
Jul 23, 2:30 PM CDTThunderstorm Wind 70St. Croix, WI

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, 7.1 hours before the alert went out and 76 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 1987-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 575 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 12:00Z on 1987-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
575 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
1013 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-25 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMSP 231908
SVRMSP
MNC163-WIC109-232000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MINNEAPOLIS MN
208 PM CDT THU JUL 23 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 300 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

EAST CENTRAL MINNESOTA...
 NORTHERN WASHINGTON
WEST CENTRAL WISCONSIN...
 ST CROIX


AT..205 PM CDT..RADAR WAS INDICATING A SEVERE THUNDERSTORM JUST
WEST OF STILLWATER IN NORTHERN WASHINGTON COUNTY OR ABOUT 15 TO
MILES NORTHEAST OF ST PAUL.

THIS SEVERE THUNDERSTORM WAS MOVING SOUTHEAST AT 35 TO 40 MILES
HOUR AND WILL BE AFFECTING AREAS NEAR STILLWATER..NEW RICHMOND..
HUDSON AND BALDWIN.

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 AON THE LOOKOUT AND BE PREPARED
TO MOVE TO A PLACE OF SAFETY IF ONE IS SPOTTED.

WILLIS

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, Jul 23, 11:42 AM CDT, 2 hours 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST CLOUD MN
1142 AM CDT THU JUL 23 1987

...STRONG THUNDERSTORM MOVING ACROSS CENTRAL STEARNS COUNTY...

AT 1140 RADAR SHOWED A STRONG THUNDERSTORM NEAR ALBANY IN CENTRAL
STEARNS COUNTY OF CENTRAL MINNESOTA. ALBANY IS 18 MILES NORTHWEST OF
ST CLOUD.

THESE THUNDERSTORMS HAVE PRODUCED PEA SIZE HAIL AND SOME HAIL UP TO
1/2 INCH.

THE THUNDERSTORMS CONTINUE TO MOVE EAST AT 30 MILES AN HOUR.

NO SEVERE WEATHER HAS BEEN REPORTED...HOWEVER PERSONS IN THE PATH OF
THESE THUNDERSTORMS CAN EXPECT SMALL HAIL...GUSTY WINDS...AND BRIEF
HEAVY RAIN.

THESE STORMS WILL MOVE THROUGH THE ST CLOUD AREA BETWEEN 12 NOON CDT
AND 1 PM CDT

YOUNG
Special weather statement, Jul 23, 12:00 PM CDT, 2 hours 8 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1155 AM CDT THU JUL 23 1987

    ..STRONG THUNDERSTORM OVER CENTRAL MINNESOTA..

AT 1140 AM CDT..AN ISOLATED INTENSE THUNDERSTORM WAS OCCURRING OVER
CENTRAL MINNESOTA TO THE WEST OF ST CLOUD NEAR THE TOWN OF ALBANY IN
NORTHERN STEARNS COUNTY.

THIS THUNDERSTORM IS CAPABLE OF PRODUCING HAIL..STRONG GUSTY WINDS ALONG
WITH FREQUENT LIGHTNING STRIKES AND BRIEF HEAVY RAINS AS IT MOVES EAST
AT ABOUT 35 MILES AN HOUR TOWARD THE ST CLOUD AREA.

THIS STRONG THUNDERSTORM WAS PART OF AN AREA OF SHOWERS AND THUNDERSTORMS
REMAINING ACROSS PARTS OF CENTRAL AND EAST CENTRAL MINNESOTA AS WELL AS
NORTHWEST SECTIONS OF WISCONSIN FROM NEAR ALEXANDRIA..TO ST CLOUD AND
MONTICELLO..EAST TOWARD HAYWARD WISCONSIN.

MOVEMENT WAS EAST AT 35 MILES AN HOUR.
SWANBERG

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 12:15 PM CDTSevere Thunderstorm WarningMPXBenton, Sherburne, Stearns60 min
Jul 23, 12:15 PM CDTSevere Thunderstorm WarningMPXMille Lacs60 min
Jul 23, 1:11 PM CDTSevere Thunderstorm WarningMPXAnoka, Isanti49 min
Jul 23, 5:15 PM CDTSevere Thunderstorm WarningMPXSherburne60 min
Jul 23, 5:33 PM CDTSevere Thunderstorm WarningMPXWright42 min
Jul 23, 6:16 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Wright59 min
Jul 23, 6:40 PM CDTTornado WarningMPXAnoka, Hennepin65 min
Jul 23, 2:30 PM CDTSevere Thunderstorm WarningMPXPolk30 min
Jul 23, 2:57 PM CDTSevere Thunderstorm WarningMPXBarron, Chippewa, Dunn, Rusk43 min
Jul 23, 3:31 PM CDTSevere Thunderstorm WarningMPXChippewa, Eau Claire59 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 1987Severe Thunderstorm Warnings in Wisconsin, 1987Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.