Alert archive / Minnesota / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 174, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 21, 1986, 12:45 AM CDT for Redwood County, Minnesota. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Sep 21, 1986, 12:45 AM CDT (05:45 UTC)
- Expired
- Sep 21, 1986, 1:40 AM CDT
- In force
- 55 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Redwood 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, 5.8 hours before the alert went out and 140 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 531 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 176 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 210545 SVRMSP MNC127-210640- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 1245 AM CDT SUN SEP 21 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 140 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY OF SOUTHWEST MINNESOTA...REDWOOD AT 1240 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM WITH HAIL INDICATED IN THE SOUTHWEST CORNER OF REDWOOD COUNTY..ABOUT 25 MILES SOUTHWEST OF REDWOOD FALLS. THE SEVERE THUNDERSTORM WAS MOVING TO THE NORTHEAST AT 25 MPH. REMEMBER SEVERE THUNDERSTORMS PRODUCE STRONG DAMAGING WINDS..LARGE HAIL AND FREQUENT LIGHTNING STRIKES. 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, Sep 20, 8:49 PM CDT, 3 hours 56 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 845 PM CDT SAT SEP 20 1986 AT 830 PM SHOWERS AND ISOLATED THUNDERSTORMS WERE CONTINUING TO INCREASE IN AREA OVER CENTRAL..SOUTH CENTRAL AND SOUTHEAST MINNESOTA INTO SOUTH- WEST WISCONSIN. A DECREASE IN OVERALL INTENSITY WAS ALSO NOTED SINCE 730 PM. THE AREA EXTENDED ALONG AND SOUTH OF A LINE FROM NEAR JACKSON MINNESOTA TO ST PETER EAST TO ABOUT 35 MILES SOUTHEAST OF THE TWIN CITIES NEAR ZUMBROTA AND ON INTO SOUTHWEST WISCONSIN EAST OF LA CROSSE NEAR TOMAH. INTENSE THUNDERSTORMS WITH VERY HEAVY RAINS CONTINUED FROM JUST SOUTH OF ROCHESTER SOUTH TO THE MINNESOTA IOWA BORDER NEAR HARMONY. THESE INTENSE THUNDERSTORMS HAVE BEEN PRODUCING VERY HEAVY RAINS WITH SOME REPORTS OF 3 INCHES OR MORE THIS AFTERNOON AND EVENING. OTHER SHOWERS HAVE BEGUN FORMING OVER SOUTH CENTRAL MINNESOTA JUST WEST OF THE AREA HAVING RECIEVED THE HEAVY RAINS...ANDR THIS CAN ONLY AGGRAVATE THE SITUATION IN THOSE AREAS. THEREFORE..PERSONS IN SOUTH CENTRAL AND SOUTHEAST MINNESOTA SHOULD BE ALERT FOR POSSIBLE FLOODING OF DITCHES AND UNDERPASSES AS WELL AS SOME SMALL STREAMS. LRS
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 4:17 AM CDT | Flash Flood Warning | MPX | Olmsted | 3 hr |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1986Every severe thunderstorm warning in 1986
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.