Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 50, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 1987, 7:07 PM CDT for Olmsted County, Winona County, Minnesota. It was in force for 53 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 11, 1987, 7:07 PM CDT (00:07 UTC)
- Expired
- Jul 11, 1987, 8:00 PM CDT
- In force
- 53 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
Counties Olmsted County, MN, Winona County, MN
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 11, 7:10 PM CDT | Tornado F0 | Winona, MN |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 0.1 hours before the alert went out and 153 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
- 2069 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1014 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KRST 120007 SVRRST MNC109-169-120100- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ROCHESTER MN 707 PM CDT SAT JUL 11 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHEAST MINNESOTA...OLMSTED AND WINONA AT 703 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES WEST OF ROCHESTER MN MOVING EAST AT 30 MPH. SOME CITIES INCLUDED IN THE WARNING ARE ROCHESTER AND WINONA. 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 DOV 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. BUSS
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 11, 4:48 PM CDT, 2 hours 19 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 445 PM CDT SAT JUL 11 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHERN AND EASTERN MINNESOTA AND PARTS WESTERN WISCONSIN...UNTIL 10 PM CDT THIS EVENING... ...SEVERE THUNDERSTORM WARNING FOR MARTIN.. FARIBAULT.. AND WESTERN FREEBORN COUNTIES OF EXTREME SOUTH CENTRAL MINNESOTA UNTIL 530 PM CDT... AT 430 PM CDT...AN AREA OF SEVERE THUNDERSTORMS WERE LOCATED ALONG AND AND JUST NORTH OF THE IOWA BORDER..NEAR THE TOWNS OF SHERBURN..FAIRMONT BLUE EARTH AND BRICELYN. THESE THUNDERSTORM WERE MOVING NORTHEAST AT 35 MILES AN HOUR. THESE ARE DANGEROUS THUNDERSTORMS AND IF THREATENING WEATHER APPROACHES YOU TAKE SHELTER IMMEDIATELY.. PROPERTY CAN BE REPLACED. CARLYON
Special weather statement, Jul 11, 5:54 PM CDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 552 PM CDT SAT JUL 11 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHERN AND EASTERN MINNESOTA AND PARTS WESTERN WISCONSIN...UNTIL 10 PM CDT THIS EVENING... ...SEVERE THUNDERSTORM WARNING IN EFFECT FOR NORTHEAST FREEBORN.. STEELE AND DODGE COUNTIES OF SOUTH CENTRAL MINNESOTA UNTIL 615 PM CDT... ...SEVERE THUNDERSTORM WARNING FOR NORTHERN WINNOA AND EASTERN WABASHA COUNTIES OF SOUTHEAST MINNESOTA UNTIL 630 PM CDT... AT 535 PM CDT...AN AREA OF SEVERE THUNDERSTORMS WAS LOCATED NEAR THE INTERSECTION OF I-35W AND 1-90..FROM BLUE EARTH THRU ALBERT LEA OVER TO AUSTIN.. MOVING NORTHEAST AT 30 MPH. SOME OF THE TOWNS IN THE PATH OF THESE STORMS WASECA..OWATONNA AND DODGE CENTER OF SOUTH CENTRAL MINNESOTA. MORE SEVERE THUNDERSTORMS WERE LOCATED ALONG THE WINNONA/WABASHA COUNTY LINE JUST SOUTH OF WABASHA.. MOVING EAST AT 25 MPH.. THESE ARE DANGEROUS THUNDERSTORMS AND IF THREATENING WEATHER APPROACHES YOU TAKE SHELTER IMMEDIATELY PROTECT YOUR LIVE PROPERTY CAN BE REPLACED.
Special weather statement, Jul 11, 6:55 PM CDT, 12 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 655 PM CDT SAT JUL 11 1987 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PARTS OF SOUTHERN AND EASTERN MINNESOTA AND PARTS WESTERN WISCONSIN...UNTIL 10 PM CDT THIS EVENING... AT 635 PM CDT...AN AREA OF POWERFUL THUNDERSTORMS WERE BETWEEN ROCHESTER AND LA CROSSE JUST SOUTH OF I-90 AND ST. CHARLES..OTHER POWEREFUL STORMS WERE LOCATED ACROSS EXTREME SOUTH CENTRAL MUCH OF SOUTHEAST MINNESOTA. FOR THE MOST PART THE STORMS WERE SOUTH OF A LINE FROM FAIRMONT TO OWATONNA TO THE MISSISSIPI RIVER JUST NORTH OF WABASHA NEAR LAKE CITY. SOME OF THE TOWNS IN THE PATH OF THESE POWERFUL STORMS ARE..LEWISTONE.. WINONA.. AND ELBA MINNESOTA..FOUNTAIN CITY AND DODGE WISCONSIN. MOVEMENT WAS TO THE NORTHEAST 25 TO 30 MILES AN HOUR. CARLYON
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 10:31 PM CDT | Severe Thunderstorm Warning | MPX | Redwood, Renville | 44 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.