Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 102, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 27, 1987, 7:24 PM CDT for Sibley County, Minnesota. It was in force for 51 min.
The area
The counties it named.
The facts
- Issued
- Jul 27, 1987, 7:24 PM CDT (00:24 UTC)
- Expired
- Jul 27, 1987, 8:15 PM CDT
- In force
- 51 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Sibley 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, 0.4 hours before the alert went out and 58 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
- 1859 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1071 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 177 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 280024 SVRMSP MNC143-280115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 724 PM CDT MON JUL 27 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF CENTRAL MINNESOTA... SIBLEY AT..714 PM CDT..STRONG WINDS DOWNED TREES IN THE EXTREME SOUTHWEST CORNER OF SCOTT COUNTY ABOUT 10 MILES EAST OF GAYLORD. THE LINE OF THUNDERSTORMS PRODUCING THESE STRONG WINDS WAS MOVING INTO EASTERN PARTS OF SIBLEY COUNTY AND THESE STORMS WILL BE AFFECTING AREAS NEAR GAYLORD..HENDERSON AND WINTHROP AS IT MOVES WEST SOUTHWEST AT 25 MPH. 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 27, 2:01 PM CDT, 5 hours 23 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 155 PM CDT MON JUL 27 1987 ..VERY STRONG THUNDERSTORMS RUMBLE ACROSS NORTHWEST WISCONSIN.. AT 145 PM CDT..RADAR WAS SHOWING A BAND OF INTENSE THUNDERSTORMS LOCATED ACROSS BARRON..NORTHEAST DUNN AND CHIPPEWA COUNTIES OF NORTHWEST WISCONSIN. THESE INTENSE THUNDERSTORMS WERE OCCURRING IN THE TURTLE LAKE..RIDGELAND SAND CREEK AND BLOOMER AREAS TO THE NORTHEAST OF CHIPPEWA FALLS AND EAU CLAIRE. MOVEMENT TO THE SOUTHEAST AT 30 MILES AN HOUR WILL TAKE THESE STRONG THUNDERSTORMS THROUGH AREAS NEAR EAU CLAIRE AND CHIPPEWA FALLS THROUGH 3 PM THIS AFTERNOON. STRONG GUSTY WINDS..FREQUENT LIGHTNING STRIKES..VERY HEAVY RAINS ALONG WITH SMALL HAIL ARE LIKELY AS THESE STORMS MOVE THROUGH SOUTHERN CHIPPEWA..EASTERN DUNN AND EAU CLAIRE COUNTIES. ELSEWHERE..SHOWERS AND THUNDERSTORMS WERE LOCATED NEAR AND NORTH OF LA CROSSE. THIS PRECIPITATION WWAS ALSO MOVING SOUTHEAST AT 25 TO 30 MILES AN HOUR. SWANBERG
Special weather statement, Jul 27, 6:43 PM CDT, 41 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 642 PM CDT MON JUL 27 1986 INTENSE THUNDERSTORMS CONTINUED OVER STEELE AND WASECA COUNTIES NEAR THE TOWNS OF WASECA...NEW RICHMOND...BLOOMING AND OWATONNA. THESE STORMS ARE CAPABLE OF PRODUCING SMALL HAIL...GUSTY WINDS AND VERY HEAVY RAINS. THE STORMS WERE MOVING TO THE SOUTHWEST AT 25 MILES AN HOUR. THE STORMS WILL BE MOVING INTO FARIBAULT AND NORTHWEST FREEBORN COUNTIES AROUND 7 PM CDT. PERSONS IN THESE COUNTIES INCLUDING THE TOWNS OF WELLS... BLUE EARTH AND BRUSH CREEK SHOULD BE PREPARED TO TAKE SHELTER IF THREATENING WEATHER APPROACHES. STRONG THUNDERSTORMS WERE LOCATED ABOUT 40 MILES SOUTHWEST OF THE TWIN CITIES FROM GLENCOE TO GAYLORD TO LE SUEUR IN SIBLEY COUNTY. THESE STORMS WERE ALSO MOVING SOUTHWEST AT 25 MILES AN HOUR. PERSONS IN WINTHROP AND NICOLLET SHOULD TAKE SHELTER IF THREATENING WEATHER APPROACHES.
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 7:26 PM CDT | Severe Thunderstorm Warning | MPX | Faribault, Freeborn | 49 min |
| Jul 27, 8:13 PM CDT | Severe Thunderstorm Warning | MPX | Faribault, Freeborn | 47 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.