Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 98, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 27, 1987, 4:54 PM CDT for Dakota County, Minnesota. It was in force for 36 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 27, 1987, 4:54 PM CDT (21:54 UTC)
- Expired
- Jul 27, 1987, 5:30 PM CDT
- In force
- 36 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Dakota 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 27, 5:20 PM CDT | Thunderstorm Wind 0 | Dakota, 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 12:00Z, 9.9 hours before the alert went out and 47 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
- 1473 J/kg
- Mixed-layer CIN
- -176 J/kg
- Mixed-layer LCL
- 645 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 146 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 272156 RRA SVRMSP MNC037-272230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING ..CORRECTION.. NATIONAL WEATHER SERVICE MINNEAPOLIS MN 454 PM CDT MON JUL 27 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 530 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST MINNESOTA... EXTREME SOUTHERN DAKOTA AT..450 PM RADAR WAS INDICATING A VERY DANGEROUS THUNDERSTORM IN THE WATERFORD AREA..WHICH IS JUST NORTH OF NORTHFIELD. THIS DANGEROUS THUNDERSTORM WAS MOVING TO THE WEST SOUTHWEST AT 10 TO 15 MPH AND WILL BE AFFECTING AREAS NEAR RANDOLPH.. CASTLE ROCK..AND WATERFORD. 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. BRANCH
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, 11:13 AM CDT, 5 hours 41 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1105 AM CDT MON JUL 27 1987 ..HEAVY RAINS CONTINUE OVER WESTERN WISCONSIN.. STRONG THUNDERSTORMS CONTINUE TO PRODUCE VERY HEAVY RAINS ACROSS PARTS OF WESTERN WISCONSIN IN AREAS ACROSS PEPIN..BUFFALO..TREMPEALEAU AND FURTHER SOUTHEAST TOWARD LA CROSSE. AT 1045 AM CDT..RADAR CONTINUED TO SHOW STRONG THUNDERSTORMS TO THE SOUTH AND SOUTHWEST OF EAU CLAIRE FROM NEAR DURAND..SOUTHEAST THROUGH MONDOVI AND GILMANTON IN BUFFALO COUNTY..EXTENDING THROUGH SOUTHERN TREMPEALEAU COUNTY IN THE BLAIR AND GALESVILLE AREAS. THUNDERSTORMS CONTINUE TO REDEVELOPE IN THESE SAME AREAS OF BUFFALO AND TREMPEALEAU COUNTIES. THE BUFFALO COUNTY SHERIFFS OFFICE REPORTED THAT STREAMS ARE RUNNING HIGH BUT NO MAJOR PROBLEMS AS OF 1030 AM. MOTORISTS ARE ADVISED TO USE CAUTION TODAY AS SMALLER STREAMS CONTINUE TO RISE. FURTHER TO THE NORTH..SOME NEW THUNDERSTORMS WERE DEVELOPING OVER PARTS OF POLK AND ST CROIX COUNTIES IN THE AMERY..NEW RICHMOND AND BALDWIN AREAS. THESE THUNDERSTORMS WERE MOVING SOUTHEAST AT 20 MILES AN HOUR SO THEY MAY MOVE OVER AREAS THAT HAVE ALREADY RECIEVED HEAVY RAINS TO THE SOUTH AND SOUTHWEST OF EAU CLAIRE. THE SITUATION WILL CONTINUE TO BE MONOTORED CLOSELY THROUGH THE AFTERNOON HOURS. PERSONS SHOULD REMAIN ALERT FOR THE POTENTIAL SOME FLOODING IN THESE AREAS. SWANBERG
Special weather statement, Jul 27, 12:09 PM CDT, 4 hours 45 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1205 PM CDT MON JUL 27 1987 ..HEAVY RAINS BEGIN TO LET UP ACROSS PARTS OF WEST CENTRAL WISCONSIN.. THUNDERSTORMS PRODUCING HEAVY RAINS WERE BEGINNING TO BECOME LESS NUMEROUS IN AREAS SOUTH AND SOUTHWEST OF EAU CLAIRE ACROSS PEPIN AND BUFFALO COUNTIES BUT FURTHER SOUTHEAST VERY HEAVY RAINS REMAIN OVER MUCH OF TREMPEALEAU COUNTY. AT 1145 AM CDT..RADAR WAS SHOWING THE STRONGEST THUNDERSTORMS CONCENTRATED IN THE GALESVILLE..BLAIR AND WHITEHALL AREAS OF TREMPEALEAU COUNTY..SOUTH THROUGH LA CROSSE. OTHER SHOWERS AND A FEW THUNDERSHOWERS WERE WIDELY SCATTERED TO THE WEST AND NORTHWEST OF EAU CLAIRE. PERSONS IN PEPIN..BUFFALO AND TREMPEALEAU COUNTIES..AS WELL AS AREAS FURTHER SOUTHEAST TOWARD LA CROSSE SHOULD WATCH FOR MINOR FLOODING ALONG LOW SPOTS..SMALL STREAMS AND OTHER AREAS WHERE HIGH WATER COULD CAUSE PROBLEMS. MOVEMENT ON THE SHOWERS AND THUNDERSTORMS ACROSS WESTERN WISCONSIN CONTINUED SOUTHEAST AT 25 MILES AN HOUR. SWANBERG
Special weather statement, Jul 27, 12:57 PM CDT, 3 hours 57 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1250 PM CDT MON JUL 27 1987 ..VERY STRONG THUNDERSTORM FORMS OVER NORTHWEST WISCONSIN.. AT 1235 PM CDT..RADAR WAS SHOWING A VERY STRONG THUNDERSTORM THAT HAD DEVELOPED OVER CENTRAL BURNETT COUNTY OF NORTHWEST WISCONSIN NEAR THE TOWNS OF SIREN AND WEBSTER. THIS THUNDERSTORM HAS THE POTENTIAL TO PRODUCE STRONG GUSTY WINDS..VERY HEAVY RAINS..SMALL HAIL AND FREQUENT LIGHTNING STRIKES AS IT MOVES TO THE SOUTHEAST AT 25 MILES AN HOUR. IF THIS STRONG THUNDERSTORM HOLDS TOGETHER IT WILL BE MOVING THROUGH PARTS OF NORTHEAST POLK AS WELL AS BARRON COUNTIES OF NORTHWEST WISCONSIN THROUGH 1 PM. FURTHER SOUTH..SHOWERS AND THUNDERSTORMS REMAINED OVER WESTERN WISCONSIN MAINLY BETWEEN EAU CLAIRE AND LA CROSSE WITH VERY HEAVY RAINS STILL ASSOCIATED WITH THIS ACTIVITY. MINOR FLOODING REMAINS A THREAT IN THIS AREA. MOVEMENT WAS SOUTHEAST AT 25 M ILES AN HOUR. SWANBERG
Special weather statement, Jul 27, 2:01 PM CDT, 2 hours 53 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
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 3:34 PM CDT | Tornado Warning | MPX | Goodhue | 26 min |
| Jul 27, 3:40 PM CDT | Tornado Warning | MPX | Dakota | 20 min |
| Jul 27, 3:59 PM CDT | Tornado Warning | MPX | Dakota | 31 min |
| Jul 27, 4:02 PM CDT | Tornado Warning | MPX | Goodhue | 28 min |
| Jul 27, 4:32 PM CDT | Tornado Warning | MPX | Goodhue, Rice | 43 min |
| Jul 27, 5:14 PM CDT | Severe Thunderstorm Warning | MPX | Rice | 46 min |
| Jul 27, 5:53 PM CDT | Severe Thunderstorm Warning | MPX | Scott | 47 min |
| Jul 27, 6:52 PM CDT | Severe Thunderstorm Warning | MPX | Steele, Waseca | 53 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.