Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 62, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 20, 1987, 8:00 PM CDT for Lac qui Parle County, Minnesota. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1987, 8:00 PM CDT (01:00 UTC)
- Expired
- Jul 20, 1987, 9:00 PM CDT
- In force
- 60 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Lac qui Parle 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
Aberdeen, SD (KHON), launched 00:00Z, 1.0 hours before the alert went out and 176 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
- 2744 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1591 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTC 210200 RRA SVRSTC MNC073-210200- BULLETIN-IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST CLOUD MN 800 PM CDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL MINNESOTA...LAC QUI PARLE INCLUDING THE CITIES OF MARIETTA AND MADISON. AT 755 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM IN EXTREME WESTERN LAC QUI PARLE COUNTY OF WEST CENTRAL MINNESOTA. THIS STORM WAS MOVING EAST AT 35 MPH. LARGE HAIL...DANGEROUS LIGHTNING...HEAVY RAINFALL...AND DAMAGING WINDS CAN BE EXPECTED FROM SEVERE THUNDERSTORMS. IF THREATENING WEATHER APPROACHES...YOU SHOULD GO TO A SvAFE PLACE IMMEDIATELY...AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR SEVERE WEATHER REPORT TO THE LOCAL NATIONAL WEATHER SERVICE OFFICE. YOUNG
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, 2:16 PM CDT, 5 hours 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 215 PM CDT MON JUL 20 1987 ...SEVERE THUNDERSTORM WATCH NUMBER 404 CANCELED FOR EAST CENTRAL MINNESOTA... THE NATIONAL WEATHER SERVICE HAS CANCELED THE SEVERE THUNDERSTORM WATCH ISSUED EARLIER FOR EAST CENTRAL MINNESOTA WHICH INCLUDED THE TWIN CITIES METRO AREA. THE LINE OF THUNDERSTORMS HAD MOVED OUT OF MINNESOTA AND INTO WEST WISCONSIN. WITH A FRONTAL BOUNDARY STILL PRESENT OVER SOUTHERN MINNESOTA JUST SOUTH OF THE TWIN CITIES...THUNDERSTORMS COULD REDEVELOP LATER THIS AFTERNOON. PERSONS SHOULD REMAIN ALERT TO LATER FORECASTS AND STATEMENTS FROM THE NATIONAL WEATHER SERVICE DURING THE AFTERNOON. JHM
Special weather statement, Jul 20, 2:53 PM CDT, 5 hours 7 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 250 PM CDT MON JUL 20 1987 AT 235 PM CDT...INTENSE THUNDERSTORMS CONTINUED OVER WEST CENTRAL WISCONSIN FROM 35 MILES SOUTHEAST OF EAU CLAIRE NEAR FAIRCHILD TO 40 MILES SOUTHWEST OF EAU CLAIRE NEAR MONDOVI. VERY HEAVY RAINS..STRONG GUSTY WINDS AND DANGEROUS LIGHTNING CAN BE EXPECTED WITH THESE STORMS AS THEY MOVE SOUTH AT 45 MILES AN HOUR. THE STORMS SHOULD BE LOCATED ALONG A LINE FROM NEAR BLACK RIVER FALLS TO 25 MILES NORTH OF LA CROSSE BY 315 PM CDT. THESE STORMS WERE PART OF AN AREA OF SHOWERS AND THUNDERSTORMS THAT EXTENDED FROM 25 MILES EAST OF HAYWARD TO 25 MILES WEST OF WAUSAU TO# SOUTH OF EAU CLAIRE. STANDFIELD JHM
Special weather statement, Jul 20, 3:47 PM CDT, 4 hours 13 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 345 PM CDT MON JUL 20 1987 ....SEVERE THUNDERSTORM WATCH UNTIL 9 PM CDT FOR PARTS OF WEST CENTRAL WISCONSIN.... AT 330 PM CDT...STRONG THUNDERSTORMS CONTINUED OVER WEST CENTRAL WISCONSIN 35 MILES NORTHEAST OF LA CROSSE JUST NORTH AND WEST OF BLACK RIVER FALLS. THE STORMS WERE MOVING SOUTH AT 40 MILES AN HOUR AND SHOULD BE LOCATED JUST NORTHEAST OF LA CROSSE TO NORTH OF TOMAH BY 415 PM CDT. VERY HEAVY RAINS...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING CAN BE EXPECTED WITH THE STORMS. ELSEWHERE..SHOWERS AND THUNDERSTORMS HAD DEVELOPED OVER WEST CENTRAL MINNESOTA FROM THE MINNESOTA/SOUTHI DAKOTA BORDER NEAR BIG STONE LAKE TO WEST OF ALEXANDRIA TO 35 MILES SOUTH OF DETROIT LAKES. MOVEMENT WAS NORTHEAST AT 45 MILES AN HOUR. STANDFIELD
Special weather statement, Jul 20, 6:21 PM CDT, 1 hour 39 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.
SWANBERGThe 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, 8:09 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 |
| Jul 20, 10:36 PM CDT | Severe Thunderstorm Warning | MPX | Carver, Hennepin | 54 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.