Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 83, NWS Twin Cities, MN

July 23, 1987Brown County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 23, 1987, 9:27 PM CDT for Brown County, Nicollet County, Minnesota. It was in force for 48 min.

The area

The counties it named.

The facts

Issued
Jul 23, 1987, 9:27 PM CDT (02:27 UTC)
Expired
Jul 23, 1987, 10:15 PM CDT
In force
48 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Brown County, MN, Nicollet 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, 2.5 hours before the alert went out and 93 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 1987-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1899 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 1987-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 162 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
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 KRST 240227
SVRRST
MNC015-103-240315-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
927 PM CDT THU JUL 23 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 1015 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTH CENTRAL MINNESOTA
          ...BROWN...NICOLLET
 
AT 915 PM RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS FROM REDWOOD
FALLS TO 40 MILES WEST OF REDWOOD FALLS MOVING TO THE EAST AT 30 MPH.
THIS WARNING INCLUDES THE TOWNS OF NEW ULM AND ST. PETER.
 
 
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.
 
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 THE 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

Local storm report, Jul 23, 3:38 PM CDT, 5 hours 49 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST CLOUD, MN
335 PM CDT THU JUL 23 1987

...ATTN SELS...

SEVERE WEATHER REPORT FROM 23 JUL 1987

1218 PM CDT 1/2 INCH HAIL AT FOLEY MINNESOTA...10 MILES NORTHEAST OF
              ST. CLOUD.
1221 PM CDT 3/4 TO 1 INCH HAIL IN NOTHERN SECTIONS OF ST. CLOUD.
1230 PM CDT LARGE TREES DOWN...POWER POLES AND POWER LINES DOWN IN
            SAUK RAPIDS MINNESOTA...A NORTHERN SUBURB OF ST. CLOUD.

FRASER
Special weather statement, Jul 23, 5:13 PM CDT, 4 hours 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST. CLOUD MN
505 PM CDT THU JUL 23 1987

...TORNADO WATCH CENTRAL MINNESOTA UNTIL 900 PM CDT...

RADAR SHOWED AN AREA OF STRONG THUNDERSTORMS DEVELOPING RAPIDLY IN
SOUTHERN SHERBURNE COUNTY.  THESE THUNDERSTORMS MAY PRODUCE LOCALLY
HEAVY RAINFALL AND SMALL HAIL.

PEOPLE IN SOUTHERN SHERBURNE COUNTY AND ESPECIALLY NEAR THE CITIES
OF BECKER... BIG LAKE AND ELK RIVER SHOULD BE PREPARED TO MOVE TO A
PLACE OF SAFETY IF SEVERE WEATHER DEVELOPES.

FRASER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 7:01 PM CDTTornado WarningMPXAnoka, Hennepin, Ramsey29 min
Jul 23, 7:21 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Ramsey, Washington54 min
Jul 23, 7:29 PM CDTTornado WarningMPXAnoka, Hennepin, Ramsey31 min
Jul 23, 7:57 PM CDTTornado WarningMPXAnoka, Dakota, Hennepin, Ramsey33 min
Jul 23, 8:33 PM CDTSevere Thunderstorm WarningMPXWashington57 min
Jul 23, 8:33 PM CDTSevere Thunderstorm WarningMPXCarver, Dakota, Hennepin, Scott57 min
Jul 23, 8:33 PM CDTSevere Thunderstorm WarningMPXRamsey57 min
Jul 23, 8:35 PM CDTSevere Thunderstorm WarningMPXYellow Medicine55 min
Jul 23, 8:57 PM CDTSevere Thunderstorm WarningMPXRedwood53 min
Jul 23, 9:46 PM CDTFlash Flood WarningMPXAnoka, Dakota, Hennepin, Ramsey, Washington3 hr
Jul 23, 9:46 PM CDTFlash Flood WarningMPXCarver, Scott3 hr
Jul 23, 11:51 PM CDTSevere Thunderstorm WarningMPXAnoka, Ramsey, Washington34 min
Jul 24, 12:03 AM CDTSevere Thunderstorm WarningMPXFillmore, Olmsted, Winona57 min
Jul 24, 12:12 AM CDTSevere Thunderstorm WarningMPXChisago33 min
Jul 24, 12:50 AM CDTFlash Flood WarningMPXCarver, Hennepin, Scott2 hr
Jul 24, 12:50 AM CDTFlash Flood WarningMPXAnoka, Dakota, Ramsey, Washington2 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 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; the sounding from the Mesonet's radiosonde archive.