Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 114, NWS Twin Cities, MN

August 16, 1987Mower County, Olmsted County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 16, 1987, 1:25 AM CDT for Mower County, Olmsted County, Minnesota. It was in force for 50 min.

The area

The counties it named.

The facts

Issued
Aug 16, 1987, 1:25 AM CDT (06:25 UTC)
Expired
Aug 16, 1987, 2:15 AM CDT
In force
50 min
Issued by
NWS Twin Cities, MN
Area
Whole counties

Counties Mower County, MN, Olmsted 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, 6.4 hours before the alert went out and 139 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 1987-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1675 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 1987-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.193958Sfc1 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
1675 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
1435 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.1
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KRST 160625
SVRRST
MNC099-109-160715-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
125 AM CDT SUN AUG 16 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL  215 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTHEAST MINNESOTA
          ...MOWER...OLMSTED
 
INCLUDING THE CITIES OF ROCHESTER AND AUSTIN.
AT 124 AM CDT A WIND GUST OF 64 MPH WAS RECORDED AT THE ROCHESTER
AIRPORT.
 
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

Special weather statement, Aug 15, 9:45 PM CDT, 3 hours 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST. CLOUD MN
945 PM CDT SAT AUG 15 1987

...STRONG THUNDERSTORMS MOVING TOWARDS MILLE LACS LAKE...

...TORNADO WATCH FOR CENTRAL MINNESOTA UNTIL 2 AM CDT...

AT 945 PM CDT A LINE OF STRONG THUNDERSTORMS WAS LOCATED BY RADAR
FROM WESTERN EDGE OF MILLE LACS LAKE SOUTHWEST TO REDWOOD FALLS.
THESE THUNDERSTORMS HAVE A HISTORY OF PRODUCING GUSTY WINDS...
HAIL...FREQUENT LIGHTNING STRIKBES AND BRIEF HEAVY RAIN.

THESE THUNDERSTORMS WERE MOVING EAST AT 30 MPH AND WILL BE AFFECTING
THE LAKE AREA UNTIL 11 PM CDT.

BOATERS...FISHERPERSONS...CAMPERS AND OTHERS IN THE MILLE LACS LAKE
AREA SHOULD TAKE NECESSARY PRECAUTIONS.

YOUNG
Local storm report, Aug 15, 10:16 PM CDT, 3 hours 9 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST CLOUD MN
1015 PM CDT SAT AUG 15 1987

...ATTN CELS...

PRELIMINARY STORM REPORT FROM ST. CLOUD MINNESOTA

804 PM CDT  UNCONFIRMED FUNNEL CLOUD 1 MILE WEST OF BROWERVILLE
            MINNESOTA IN TODD COUNTY...28 MILES NORTHEAST OF
            ALENANDRIA.
815 PM CDT  POWER LINES DOWN FROM EST 60 MPH WIND AT EAGLE BEND IN
            TODD COUNTY...25 MILES NORTHEAST OF ALEXANDRIA.
            POWER LINES DOWN AND TREES DOWN AT HEWITT IN TODD COUNTY
            ...35 MILES NORTHEAST OF ALEXANDRIA.
825 PM CDT  GUST ESTIMATED TO 60 MPH.  VISIBILITY NEAR ZERO WITH
            HEAVY RAIN AT BROOTEN MINNESOTA IN STEARNS COUNTY...45
            MILES WEST OF ST. CLOUD.
914 PM CDT  POWER LINES AND TREES DOWN AT NEW LONDOW AND SPICER IN
            KANDIYOHI COUNTY...10 TO 15 MILES NORTHEAST OF WILLMAR.
915 PM CDT POWER LINES AND TREES DOWN WITH 50 TO 60 MPH WIND AT
           PIERZ MINNESOTA INV MORRISON COUNTY...25 MILES SOUTH OF
           BRAINERD.

FRASER
Special weather statement, Aug 15, 10:44 PM CDT, 2 hours 41 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1040 PM CDT SAT AUG 15 1987

...TORNADO WATCH NUMBER 482 CANCELED FOR NORTHERN MINNESOTA BUT
   CONTINUES IN EFFECT FOR SOUTHERN MINNESOTA...

THE NATIONAL WEATHER SERVICE HAS CANCELED TORNADO WATCH NUMBER
482 FOR NORTHERN MINNESOTA ROUGHLY NORTH OF A LINE EXTENDING FROM
A POINT 30 MILES WEST NORTHWEST OF ALEXANDRIA MINNESOTA TO A POINT
45 MILES EAST NORTHEAST OF ST. CLOUD MINNESOTA. WHILE SHOWERS AND
THUNDERSTORMS WILL CONTINUE IN NORTHERN MINNESOTA THEY SHOULD REMAIN
BELOW SEVERE LIMITS.

TORNADO WATCH NUMBER 482 REMAINS IN EFFECT FOR MUCH OF SOUTHERN
MINNESOTA UNTIL 2 AM CDT. COUNTIES STILL IN THE WATCH ARE...
<
WESTCENTRAL.........GRANT..DOUGLAS..STEVENS..
                    POPE..BIG STONE..SWIFT..LAC QUI PARLE..CHIPPEWA..
                    YELLOW MEDICINE
<
CENTRAL.......TODD..MORRISON..
              STEARNS..BENTON..SHERBURNE..KANDIYOHI..MEEKER..WRIGHT..
                    RENVILLE..MCLEOD..SIBLEY

EASTCENTRAL.........NORTHWEST PINE..MILLE LACS...
                    KANABEC..NORTHWEST ISANTI

SOUTHWEST..........LINCOLN..LYON..REDWOOD..BROWN..PIPESTONE..MURRAY..
                    COTvTONWOOD..WATONWAN..ROCK..NOBLES..JACKSON..MARTIN

SOUTHCENTRAL.......WESTERN NICOLLET

NAISTAT
Special weather statement, Aug 15, 10:51 PM CDT, 2 hours 34 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1045 PM CDT SAT AUG 15 1987

...TORNADO WATCH IN EFFECT FOR A LARGE PORTION OF MINNESOTA
   UNTIL 2 AM CDT SUNDAY MORNING...NOT INCLUDING THE TWIN CITIES...

AT 1030 PM...INTENSE THUNDERSTORMS WERE OCCURRING IN A 40 MILE WIDE LINE
EXTENDING FROM JUST EAST OF HIBBING...SOUTH THRU CAMBRIDGE.. MONTICELLO..
BUFFALO AND NEW ULM..30 TO 50 MILES SOUTHWEST THRU NORTHWEST OF THE TWIN
CITIES. FROM NEW ULM THE LINE EXTENDED SOUTHWEST TO THE IOWA BORDER NEAR
WORTHINGTON.
THE MOST INTENSE THUNDERSTORMS WERE LOCATED OVER CENTRAL MINNESOTA.. 50
MILES WEST OF THE TWIN CITIES.. MOVING INTO WESTERN SECTIONS OF SIBLEY
AND MCLEOD COUNTIES.. A FEW MILES WEST OF OF HUTCHINSON SOUTHWEST TO
FAIRFAX.. WINDS GUSTS OF 50 TO 55 MPH...HAIL...INTENSE RAINFALL... AND
FREQUENT LIGTHNING.  THE THUNDERSTORMS WILL BE REACHING THE WESTERN
SECTIONS OF THE TWIN CITIES METRO AREA AROUND 1100 PM.

MOVEMENT WAS TO THE EAST AT 35 MILES AN HOUR.
 CARLYON
Special weather statement, Aug 15, 11:39 PM CDT, 1 hour 46 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1137 PM CDT SAT AUG 16 1987

...TORNADO WATCH IN EFFECT FOR A LARGE PORTION OF MINNESOTA
   UNTIL 2 AM CDT SUNDAY MORNING...NOT INCLUDING THE TWIN CITIES...

AT 1126 PM...INTENSE THUNDERSTORMS WERE OCCURRING IN A 40 MILE WIDE LINE
EXTENDING FROM GRANTSBURG WISCONSIN...SOUTH THRU TAYLORS FALLS.. AND THE
TWIN CITIES.. SOUTHWEST TO MANKATO.
FROM MANKATO THE LINE EXTENDED SOUTHWEST TO SOUTH CENTRAL MINNESOTA NEAR
ST JAMES.

THE MOST INTENSE THUNDERSTORMS WERE LOCATED OVER EAST CENTRAL MINNESOTA..
ACROSS ANOKA AND HENNEPIN COUNTIES OF THE TWIN CITIES METRO AREA.. MOVING
EAST AT 35 MPH...WINDS GUSTS OF 50 TO 55 MPH...HAIL...INTENSE RAINFALL...
AND FREQUENT LIGTHNING.  THE THUNDERSTORMS WILL BE MOVING THRU THE REST
OF THE TWIN CITIES METRO AREA BETWEEN 1135 PM TO 1235 AM THIS SATURDAY
NIGHT/SUNDAY MORNING.
THERE HAS NOT BEEN ANY SEVERE WEATHER REPORTED FROM THIS LINE OF STORMS
SINE 900 PM CDT SATURDAY EVENING.      CARLYON
Special weather statement, Aug 16, 12:43 AM CDT, 42 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
1240 AM CDT SUN AUG 16 1987

AT 1230 AM...THUNDERSTORMS WITH VERY HEAVY RAINFALL WERE OCCURRING OVER
WEST CENTRAL WISCONSIN AND SOUTHEAST THROUGH SOUTH CENTRAL MINNESOTA.
THEY WERE MAINLY IN A 40 MILE WIDE AREA FROM BARRON IN WEST CENTRAL
WISCONSIN...TO NORTHFIELD...TO ALBERT LEA IN SOUTH CENTRAL MINNESOTA.
THESE THUNDERSTORMS PRODUCED VERY HEAVY RAINFALL AND STANDING WATER
ON ROADS AS THEY MOVED THROUGH THE TWIN CITIES SINCE 1100 PM.  THEY
MAY ALSO BE EXPECTED TO PRODUCE STRONG GUSTY WINDS TO ABOUT 50 MILES AN
HOUR AS WELL AS FREQUENT LIGHTNING AND POSSIBLE HAIL.  MOVEMENT WAS TO
THE EAST AT 35 MILES AN HOUR.

RAIN...MOSTLY LIGHT...COVERED A LARGER SECTION OF THE SOUTHEAST HALF
OF MINNESOTA AS WELL AS WESTERN WISCONSIN.
KRAFT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 7:48 PM CDTSevere Thunderstorm WarningMPXPope57 min
Aug 15, 8:00 PM CDTSevere Thunderstorm WarningMPXChippewa, Swift60 min
Aug 15, 8:00 PM CDTSevere Thunderstorm WarningMPXTodd60 min
Aug 15, 8:20 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Stearns60 min
Aug 15, 8:45 PM CDTSevere Thunderstorm WarningMPXMorrison60 min
Aug 15, 8:45 PM CDTSevere Thunderstorm WarningMPXYellow Medicine60 min
Aug 15, 9:05 PM CDTSevere Thunderstorm WarningMPXBenton, Meeker, Morrison, Sherburne, Stearns60 min

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.