Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 52, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 20, 1987, 8:52 AM CDT for Polk County, Wisconsin. It was in force for 43 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 1987, 8:52 AM CDT (13:52 UTC)
- Expired
- Jul 20, 1987, 9:35 AM CDT
- In force
- 43 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Polk County, WI
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 12:00Z, 1.9 hours before the alert went out and 113 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
- 4599 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 604 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 192 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 15.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 201352 SVRMSP WIC095-201435- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 852 AM CDT MON JUL 20 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 935 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF WEST CENTRAL WISCONSIN... POLK AT 837 AM A SEVERE THUNDERSTORM WAS LOCATED NEAR THE TOWN OF SUNRISE IN CHISAGO COUNTY OF EAST CENTRAL MINNESOTA. THIS STORM WAS 45 MILES WEST OF THE TOWN OF RICE LAKE AND WAS MOVING EAST AT 40 MILES PER HOUR. SOME TOWNS IN THE PATH OF THIS STORM ARE WOLF CREEK..MILLTOWN AND BALSAM LAKE. 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 SPOTTE D. WJH
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, 5:19 AM CDT, 3 hours 33 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 510 AM CDT MON JUL 20 1987 ...PART OF SOUTHWEST MINNESOTA IS BEING CLEARED FROM SEVERE THUNDERSTORM WATCH NUMBER 400... THE COUNTIES OF LINCOLN..PIPESTONE..ROCK..LAC QUE PARLE AND WESTERN YELLOW MEDICINE HAVE BEEN CLEARED FROM SEVERE THUNDERSTORM WATCH NUMBER 400 AS OF 5AM CDT THIS MONDAY MORNING. HOWEVER THE WATCH CONTINUES FOR THE REMAINDER OF THE WATCH AREAS OVER EXTREME WEST CENTRAL MINNESOTA UNTIL 7AM THIS MONDAY MORNING. AND ANOTHER SEVERE THUNDERSTORM WATCH IS NOW BEING ISSUED FOR CENTRAL MINNESOTA. DETAILS ON THAT WATCH ARE HAVE JUST BEEN ISSUED. THUNDERSTORMS CONTINUE OVER WEST CENTRAL MINNESOTA AND AR E MOVING TOWARD THE EAST NORTHEAST INTO CENTRAL SECTIONS OF THE STATE. SEVERAL WARNINGS HAVE BEEN ISSUED FOR THESE THUNDERSTORMS AS THEY MOVED INTO WEST CENTRAL SECTIONS. WILLIS
Special weather statement, Jul 20, 7:16 AM CDT, 1 hour 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST. CLOUD MN 705 AM CDT MON JUL 20 1987 ...SEVERE THUNDERSTORM WATCH UNTIL 11 AM CDT... ...LINE OF STRONG THUNDERSTORMS MOVING TOWARD MILLE LACS LAKE... AT 700 AM CDT RADAR SHOWED A LINE OF STRONG THUNDERSTORMS EXTENDING FROM HILL CITY TO THE WESTERN EDGE OF MILLE LACS LAKE TO WEST OF ST CLOUD. THESE THUNDERSTORMS WERE MOVING EAST NORTHEAST AT 35 MPH AND WILL BE AFFECTING THE MILLE LACS LAKE AREA UNTIL ABOUT 9 AM CDT. THUNDERSTORMS IN THIS LINE HAVE PRODUCED VERY HEAVY RAINS...FREQUENT LIGHTNING AND WINDS GUSTING TO NEAR 45 MPH. BOATERS...FISHERPERSONS...AND OTHERS ENGAGED IN OUTDOOR ACTIVITIES IN THE MILLE LACS LAKE AREA SHOULD TAKE NECESSARY PRECAUTIONS. YOUNG
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 9:40 AM CDT | Severe Thunderstorm Warning | MPX | Barron | 35 min |
| Jul 20, 10:18 AM CDT | Severe Thunderstorm Warning | MPX | Barron, Chippewa, Rusk | 57 min |
| Jul 20, 11:04 AM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Rusk | 41 min |
| Jul 20, 1:50 PM CDT | Severe Thunderstorm Warning | MPX | Dunn, Eau Claire, Pepin | 40 min |
Nearby
Severe 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; the sounding from the Mesonet's radiosonde archive.