Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 105, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 30, 1987, 12:57 AM CDT for Dakota County, Minnesota. It was in force for 13 min.
The area
The counties it named.
The facts
- Issued
- Jul 30, 1987, 12:57 AM CDT (05:57 UTC)
- Expired
- Jul 30, 1987, 1:10 AM CDT
- In force
- 13 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.
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 6.0 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
- 3389 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1006 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 300557 SVRMSP MNC037-300700- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 1257 AM CDT THU JUL 30 1987 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 200 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHEAST MINNESOTA... SOUTHERN DAKOTA AT 1250 AM A SEVERE THUNDERSTORM WAS LOCATED OVER EAST CENTRAL MINNESOTA 15 MILES SOUTH OF DOWNTOWN ST PAUL NEAR APPLE VALLEY. AT 1245 AM THE PUBLIC REPORTED TREES DOWN AND WINDS OF 60 TO 65 MILES AN HOUR IN THE APPLE VALLEY AREA. THE STORM WAS MOVING SOUTHEAST AT 20 MILES AN HOUR AND WILL BE AFEECTING THE CITIES OF FARMINGTON...HAMPTON AND VERMILLION. 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. RICHARDSON
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 29, 9:31 PM CDT, 3 hours 26 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 830 PM CDT WED JUL 29 1987 AT 825 PM CDT...STRONG THUNDERSTORMS HAD DEVELOPED OVER WEST CENTRAL MINNESOTA ABOUT 20 MILES WEST OF WILLMAR ON THE SWIFT AND CHIPPEWA COUNTY LINES. THESE THUNDERSTORMS COULD PRODUCE SOME HEAVY DOWNPOURS AND STRONG GUSTY WINDS AS THEY MOVE EAST AT ABOUT 10 TO 15 MILES AN HOUR. NO SEVERE WEATHER HAS BEEN REPORTED WITH ThHESE STORMS BUT PERSONS IN WEST CENTRAL MINNESOTA AND IN PARTICULAR SWIFT...CHIPPEWA AND KANDIYOHI COUNTYS SHOULD BE ON THE LOOKOUT FOR THESE STORMS AND BE PREPARED TO SEEK SAFE SHELTER IF THREATENING WEATHER DEVELOPS. STANDFIELD SWANBERG
Special weather statement, Jul 29, 9:49 PM CDT, 3 hours 8 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 930 PM CDT WED JUL 29 1987 ....CORRECTION FOR TIME.... AT 925 PM CDT...STRONG THUNDERSTORMS HAD DEVELOPED OVER WEST CENTRAL MINNESOTA ABOUT 20 MILES WEST OF WILLMAR ON THE SWIFT AND CHIPPEWA COUNTY LINES. THESE THUNDERSTORMS COULD PRODUCE SOME HEAVY DOWNPOURS AND STRONG GUSTY WINDS AS THEY MOVE EAST AT ABOUT 10 TO 15 MILES AN HOUR. NO SEVERE WEATHER HAS BEEN REPORTED WITH THESE STORMS BUT PERSONS IN WEST CENTRAL MINNESOTA AND IN PARTICULAR SWIFT...CHIPPEWA AND KANDIYOHI COUNTYS SHOULD BE ON THE LOOKOUT FOR THESE STORMS AND BE PREPARED TO SEEK SAFE SHELTER IF THREATENING WEATHER DEVELOPS. ST|ANDFIELD
Special weather statement, Jul 29, 11:00 PM CDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1100 PM CDT WED JUL 29 1987 AT 1050 PM CDT...INTENSE THUNDERSTORMS CONTINUED TO DEVELOP OVER SOUTH AND CENTRAL SECTIONS OF MINNESOTA FROM WEST OF ROCHESTER NORTHWEST TO NEAR FAIRBAULT TO EAST OF LITCHFIELD TO NORTHWEST OF WILLMAR. THE STRONGEST STORMS WERE LOCATED OVER KANDIYOHI...MEEKER...RICE AND MC CLEOD COUNTYS. VERY HEAVY RAINS...FREQUENT DANGEROUS LIGHTNING AND HAIL CAN BE EXPECTED WITH THESE STORMS AS THEY MOVE SLOWLY EAST AT 10 TO 15 MILS AN HOUR. NO SEVERE WEATHER HAS BEEN REPORTED WITH THESE STORMS BUT PERSONS IN THESE COUNTIES SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND BE PREPARED TO SEEK SAFE SHELTER. STANDFIELD
Special weather statement, Jul 30, 12:08 AM CDT, 49 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1205 PM CDT WED JUL 29 1987 ...FLOOD WATCH FOR PORTIONS OF EAST CENTRAL AND CENTRAL MINNESOTA INCLUDING THE TWIN CITIES METROPOLITAN AREA UNTIL 430 AM CDT THURSDAY MORNING... AT 1155 PM CDT...THUNDERSTORMS WERE PRODUCING VERY HEAVY RAINS IN A BAND FROM EAST OF ROCHESTER NORTHWEST THROUGH THE SOUTHWEST SUBURBS TO NORTHEAST OF WILLMAR. THE STORMS WERE MOVING SLOWLY EAST AT 10 TO 15 MILES AN HOUR AND WITH THIS SLOW MOVEMENT THE STORMS COULD ONCE AGAIN CAUSE FLOODING PROBLEMS IN AREAS THAT HAVE HAD THE RECENT HEAVY RAINS. PERSONS IN THE METRO AREA SHOULD BE ALERT TO POSSIBLE FLOODING AND BEF PREPARED TO TAKE ACTION IF A FLOOD WARNING IS ISSUED. STANDFIELD
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.