Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 66, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 20, 1987, 10:36 PM CDT for Carver County, Hennepin County, Minnesota. It was in force for 54 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1987, 10:36 PM CDT (03:36 UTC)
- Expired
- Jul 20, 1987, 11:30 PM CDT
- In force
- 54 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
Counties Carver County, MN, Hennepin 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, 3.6 hours before the alert went out and 8 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.
- Mixed-layer CAPE
- 3871 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 860 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 4.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 210336 SVRMSP MNC019-053-210430- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 1036 PM CDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1130 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF EAST CENTRAL MINNESOTA... NORTHEAST CARVER AND HENNEPIN AT..1030 PM CDT..A CLUSTER OF SEVERE THUNDERSTORMS WAS LOCATED ACROSS MUCH OF HENNEPIN COUNTY AS WELL AS NORTHEAST CARVER COUNTY OF THE TWIN CITIES METROPOLITAN AREA. THESE THUNDERSTORMS WERE SLOWLY MOVING EAST NORTHEAST AT ABOUT 15 MILES AN HOUR AND WILL BE AFFECTING AREAS INCLUDING MINNEAPOLIS.. BLOOMINGTON..MINNETONKA..CHANHASSEN AND BROOKLYN CENTER. DOWNED TREES WERE REPORTED IN EXCELSIOR WITH DIME SIZE HAIL AND HIGH WINDS IN MOUND. PERSONS SHOULD ALSO BE AWARE OF FLOODED ROADS AND FREQUENT DANGEROUS LIGHTNING WITH THIS SEVERE ACTIVITY. 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. MATHEWS
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 20, 6:21 PM CDT, 4 hours 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
615 PM CDT MON JUL 20 1987
..THUNDERSTORMS TO AFFECT THE LAKE MINNETONKA AREA..
A STRONG THUNDERSTORM HAS BEEN DEVELOPING RAPIDLY OVER WESTERN HENNEPIN
COUNTY IN THE MOUND AND INDEPENDENCE AREA. THIS THUNDERSTORM WAS SLOWLY
MOVING TO THE EAST SOUTHEAST AND IT WILL MOVE ACROSS PARTS OF LAKE
MINNETONKA THROUGH 700 PM.
SOME LIGHTNING..GUSTY WINDS AND HEAVY RAINS ARE POSSIBLE WITH THIS STORM.
PERSONS BOATING OR FISHING ON LAKE MINNETONKA SHOULD MAKE PLANS NOW TO
HEAD FOR SAFE HARBOR UNTIL THE THUNDERSTORMS PASS BY THE LAKE.
AT 615 PM CDT..OTHER THUNDERSTORMS WERE FORMING OVER SCOTT..WESTERN ANOKA
AND WRIGHT COUNTIES OF THE WESTERN METROPOLITAN AREA.
THEY WERE MOVING EAST AT ABOUT 20 MILES AN HOUR.
SWANBERGSpecial weather statement, Jul 20, 8:04 PM CDT, 2 hours 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN
800 PM CDT MON JUL 20 1987
..INTENSE THUNDERSTORMS ACROSS SOUTHERN AND CENTRAL MINNESOTA AND
NORTHWEST WISCONSIN..
AT 800 PM CDT..THE STRONGEST THUNDERSTORMS WERE OCCURRING IN AND AROUND
THE TWIN CITIES AREA WITH HAIL..HIGH WINDS AND VERY HEAVY RAINS.
SMALL HAIL..WINDS GUSTING TO 50 MPH AND TORRENTIAL RAINS CAN BE EXPECTED
ACROSS THE METROPOLITAN AREA rUNTIL AT LEAST 930 PM.
STREET FLOODING CAN ALSO BE EXPECTED.
SWANBERG
SWANBERGSpecial weather statement, Jul 20, 9:20 PM CDT, 1 hour 16 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST CLOUD MN 915 PM CDT MON JUL 20 1987 ...SEVERE THUNDERSTORM WATCH FOR CENTRAL AND SOUTHERN MINNESOTA UNTIL 100 AM CDT... RADAR SHOWED A LINE OF VERY INTENSE THUNDERSTORMS IN MINNESOTA FROM THE SOUTH DAKOTA BORDER AND YELLOW MEDICINE COUNTY BORDER EAST THROUGH CHIPPEWA AND KANDIYOHI COUNTY. THESE THUNDERSTORMS HAVE PRODUCED PEA SIZE HAIL AND BRIEF HEAVY RAIN AND ONE REPORT OF WIND GUST TO 50 MPH. THE THUNDERSTORMS CONTINUE TO MOVE EAST AT 30 MILES AN HOUR. ALTHOUGH NO SEVERE WEATHER HAS BEEN REPORTED THE POTENTIAL IS HIGH FOR SEVERE DEVELOPMENT. PLEASE STAY TUNED TO NOAA WEATHER RADIO...TELEVISION AND YOUR LOCAL RADIO STATION FOR FUTURE UPDATES OR WARNINGS. FRASER
Special weather statement, Jul 20, 9:26 PM CDT, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 925 PM CDT MON JUL 20 1987 ...PART OF SEVERE THUNDERSTORM WATCH NUMBER 409 CLEARED... THE NATIONAL WEATHER SERVICE HAS CLEARED THE NORTH PORTION OF SEVERE THUNDERSTORM WATCH NUMBER 409 ISSUED EARLIER THIS EVENING. THE WATCH IS CLEARED NORTH OF A LINE FORM BROWNS VALLEY IN WEST CENTRAL MINNESOTA TO ALEXANDRIA TO SAUK RAPIDS TO FOLEY TO CAMBRIDGE AND TO CENTER CITY IN EAST CENTRAL MINNESOTA. THE COUNTIES THAT ARE CLEARED FROM THE WATCH ARE... IN WEST CENTRAL MINNESOTA...TRAVERSE..GRANT..DOUGLAS..OTTERTAIL.. AND WILKIN. IN CENTRAL......TODD..MORRISON..SOUTHERN CROW WING.. < IN EAST CENTRAL.....MILLE LACS..KANABEC..ISANTI..CHISAGO..PINE.. THE TWIN CITIES METRO AREA IS STILL INCLUDED IN THE SEVERE THUNDERSTORM WATCH UNTIL 1 AM CDT TUESDAY. JHM
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 7:06 PM CDT | Tornado Warning | MPX | Dakota | 24 min |
| Jul 20, 7:13 PM CDT | Tornado Warning | MPX | Anoka, Hennepin, Ramsey | 27 min |
| Jul 20, 7:14 PM CDT | Severe Thunderstorm Warning | MPX | Meeker | 61 min |
| Jul 20, 8:00 PM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle | 60 min |
| Jul 20, 8:09 PM CDT | Severe Thunderstorm Warning | MPX | Ramsey, Washington | 51 min |
| Jul 20, 9:34 PM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Scott | 56 min |
| Jul 20, 9:45 PM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi, Meeker | 60 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.