Alert archive / Minnesota / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 43, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 11, 1987, 7:42 AM CDT for Blue Earth County, Minnesota. It was in force for 48 min.
The area
The counties it named.
The facts
- Issued
- Jul 11, 1987, 7:42 AM CDT (12:42 UTC)
- Expired
- Jul 11, 1987, 8:30 AM CDT
- In force
- 48 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Blue Earth 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 12:00Z, 0.7 hours before the alert went out and 98 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
- 2637 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 638 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KRST 111242
SVRRST
MNC013-111330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ROCHESTER MN
742 AM CDT SAT JUL 11 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 830 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH CENTRAL MINNESOTA
...BLUE EARTH ...INCLUDING THE CITY OF MANKATO...
AT 740 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM 25 MILES
SOUTHWEST OF MANKATO NEAR WILLOW CREEK. THIS SEVERE THUNDERSTORM WAS
MOVING TO THE NORTHEAST AT 40 MPH.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.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, 5:35 AM CDT, 2 hours 7 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 535 AM CDT SAT JUL 11 1987 ...SEVERE THUNDERSTORM WRNING FOR COTTONWOOD AND JACKSON COUNTIES OF SOUTHWEST MINNESOTA UNTIL 615 AM CDT THIS SATURDAY MORNING..... AT 515 AM VERY HEAVY THUNDERSTORMS WERE APPROACHING THE MINNESOTA RIVER BETWEEN GRANITE FALLS AND REDWOOD FALLS ALONG THE REDWOOD AND RENVILLE COUNTY LINE IN SOUTHWEST MINNESOTA. THESE THUNDERSTORMS WERE PRODUCING HEAVY RAINS..SMALL HAIL AND GUSTY WINDS TO 40 MPH. NO SEVERE WEATHER HAD AS YET BEEN REPORTED WITH THESE THUNDERSTORMS BUT TO THE SOUTH HEAVIER THUNDERSTORMS WERE MOVING OUT OF MURRAY AND NOBLES COUNTIES INTO COTTONWOOD AND JACKSON COUNTIES OF SOUTHWEST MINNESOTA. THESE THUNDER- STORMS WERE INDICATED AS SEVERE AND WARNINGS HAVE BEEN ISSUED FOR PORTIONS OF THESE COUNTIES UNTIL 615 AM CDT THIS SATURDAY MORNING FOR LARGE HAIL AND STRONG SURFACE WINDS. ADDITIONAL SHOWERS AND THUNDERSTORMS WERE ALSO INDICATED OVER PORTIONS OF CENTRAL MINNESOTA AND NORTHWEST WISCONSIN. SCATTERED LIGHT RAINSHOWRS WERE LOCATED BETWEEN PRINCETON AND LAKE MILLE LACS IN CENTRAL MINNESOTA AND SCATTERED HEAVY THUNDERSTORMS WERE LOCATED BET5WEEN SPOONER AND HAYWARD IN NORTHWEST WISCONSIN. MOVEMENT OF THESE SHOWER AND THUNDERSTORM AREAS WAS TO THE EAST NORTHEAST AT 25 TO 30 MILES AN HOUR. DOMBROWSKY
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 10:00 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 60 min |
| Jul 10, 10:20 PM CDT | Tornado Warning | MPX | Todd | 25 min |
| Jul 11, 12:16 AM CDT | Severe Thunderstorm Warning | MPX | Carver, Scott, Sibley | 44 min |
| Jul 11, 3:20 AM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle, Yellow Medicine | 60 min |
| Jul 11, 4:20 AM CDT | Severe Thunderstorm Warning | MPX | Yellow Medicine | 60 min |
| Jul 11, 5:50 AM CDT | Severe Thunderstorm Warning | MPX | Kandiyohi | 60 min |
| Jul 11, 6:15 AM CDT | Severe Thunderstorm Warning | MPX | Meeker | 60 min |
| Jul 11, 6:45 AM CDT | Severe Thunderstorm Warning | MPX | Wright | 45 min |
| Jul 11, 7:11 AM CDT | Severe Thunderstorm Warning | MPX | Watonwan | 49 min |
| Jul 11, 7:19 AM CDT | Severe Thunderstorm Warning | MPX | Hennepin, Sherburne | 21 min |
| Jul 11, 7:19 AM CDT | Severe Thunderstorm Warning | MPX | Anoka, Isanti | 56 min |
| Jul 11, 7:52 AM CDT | Severe Thunderstorm Warning | MPX | Washington | 28 min |
| Jul 11, 7:52 AM CDT | Severe Thunderstorm Warning | MPX | Chisago | 38 min |
| Jul 11, 4:47 PM CDT | Severe Thunderstorm Warning | MPX | Faribault, Freeborn | 53 min |
| Jul 11, 4:47 PM CDT | Severe Thunderstorm Warning | MPX | Martin | 53 min |
| Jul 11, 5:31 PM CDT | Severe Thunderstorm Warning | MPX | Dodge, Freeborn, Steele | 44 min |
| Jul 11, 5:48 PM CDT | Severe Thunderstorm Warning | MPX | Wabasha, Winona | 42 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.