Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 108, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 17, 1991, 10:29 PM CDT for Sibley County, Minnesota. It was in force for 31 min.
The area
The counties it named.
The facts
- Issued
- Jul 17, 1991, 10:29 PM CDT (03:29 UTC)
- Expired
- Jul 17, 1991, 11:00 PM CDT
- In force
- 31 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Sibley County, MN
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 3.5 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
- 1083 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 1349 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 180330 SVRMSP MNC143-180400- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 1029 PM CDT WED JUL 17 1991 THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1100 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN CENTRAL MINNESOTA ...EXTREME SOUTHERN SIBLEY COUNTY AT 1025 PM A SEVERE THUNDERSTORM WAS ABOUT 25 MILES NORTHWEST OF MANKATO NEAR WINTROP. AT 1019 PM WINDS OF 60 MILES AN HOUR WERE ESTIMATED IN GIBBON. THE STORM WAS MOVING SOUTHEAST AT 30 MILES AN HOUR AND COULD AFFECT THE RURAL AREAS SOUTH OF GAYLORD. WHEN THUNDERSTORMS ARE OCCURRING..MOVE INSIDE A STRONG BUILDwING DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOS WITH LITTLE OR NO WARNING.
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 17, 6:44 PM CDT, 3 hours 45 minutes before
MNZ014-013-011-180045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA 644 PM CDT WED JUL 17 1991 ...SEVERE THUNDERSTORM WATCH UNTIL MIDNIGHT... A NEW SEVERE THUNDERSTORM WATCH EFFECTIVE UNTIL MIDNIGHT COVERS MUCH OF CENTRAL MINNESOTA INCLUDING THE ST CLOUD AREA. AT 630 PM CDT THUNDERSTORMS CONTINUED TO DEVELOP OVER CENTRAL MINNESOTA. THE STRONGEST STORM WAS LOCATED 20 MILES NORTHWEST OF ALEXANDRIA AND WAS MOVING SOUTHEAST AT 25 MPH. OTHER STRONG STORMS WERE LOCATED IN WEST CENTRAL MINNESOTA AND NORTH OF THE TWIN CITIES. ALTHOUGH NO SEVERE WEATHER HAS BEEN REPORTED SINCE 500 PM THE POTENTIAL FOR STRONG WINDS...LARGE HAIL...HEAVY RAINS AND FREQUENT LIGHTNING STRIKES DOES EXIST WITH THESE STORMS AS THEY MOVE THROUGH CENTRAL MINNESOTA. NNNN
Special weather statement, Jul 17, 9:44 PM CDT, 45 minutes before
MNZ014-013-180345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST CLOUD MINNESOTA 944 PM CDT WED JUL 17 1991 ...SEVERE THUNDERSTORM WATCH UNTIL MIDNIGHT... AT 930 PM THUNDERSTORMS CONTINUED OVER CENTRAL MINNESOTA FROM WEST OF THE TWIN CITIES TO NEAR REDWOOD FALLS. THE STRONGEST STORM WAS LOCATED JUST NORTH OF REDWOOD FALLS AND WAS MOVING SOUTHEAST AT 25 MPH. AROUND 815 PM 3/4 INCH HAIL WAS REPORTED AT MONTEVIDEO WHICH IS 35 MILES SOUTHWEST OF WILLMAR. AROUND 830 PM NUMEROUS TREES AND TWO BARNS WERE BLOWN DOWN NEAR MONTEVIDEO. ALSO TREES WERE REPORTED DOWN NEAR MAYNARD WHICH IS 12 MILES SOUTHEAST OF MONTEVIDEO. THUNDERSTORMS HAVE DECREASED IN INTENSITY AND COVERAGE SINCE J9 PM HOWEVER THE POSSIBILITY OF SEVERE WEATHER STILL EXISTS IN THE WATCHED AREA OF CENTRAL MINNESOTA. NNNN
Local storm report, Jul 17, 10:09 PM CDT, 20 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST. CLOUD MN
1000 PM CDT WED JUL 17 1991
...FOR REPORTS IN WATCH # 687 ONLY...
720 PM CDT...5 LARGE PINE TREES DOWN IN EASTERN PART OF THE CITY OF
GLENWOOD OR 15 S AXN. 1 TREE DOWN AND BLOCKING ROAD 1 MILE
SOUTH OF GLENWOOD. POWER OUT IN LOWRY...14 SSW AXN.
815 PM CDT...3/4 INCH HAIL IN MONTIVIDEO...43 NW RWF.
815 PM CDT...WIND IN EXCESS OF 60 MPH PEGGED NEEDLE AT KDMA RADIO
IN MONTIVIDEO...TIME ESTIMATED.
830 PM CDT...2 STORY BARN EXPLODED-DESTROYED 6 MILES WEST OF MONTIVIDEO
ON RIVER ROAD. ALSO ANOTHER BARN DESTROYED 1 MILE SOUTH OF
THERE.
830 PM CDT...20 FT TALL TREES DOWN NEARa MAYNARD...37 NW RWF
854 PM CDT...UNCONFIRMED FUNNEL CLOUD 4 N OF ECHO...15 WNW RWF.
KRUSESpecial weather statement, Jul 17, 10:15 PM CDT, 14 minutes before
MNZALL-180400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1005 PM CDT WED JUL 17 1991 ...SEVERE THUNDERSTORM WATCH 687 CANCELLED FOR CENTRAL MINNESOTA... SEVERE THUNDERSTORM WATCH NUMBER 687 HAS BEEN CANCELLED NORTH OF A LINE FROM FOREST LAKE IN EAST CENTRAL MINNESOTA TO JUST SOUTH OF WILLMAR. THE WATCH HAS ALSO BEEN CANCELLED WEST OF A LINE FROM REDWOOD FALLS TO ST JAMES. SOUTHERN MINNESOTA..INCLUDING THE TWIN CITIES METROPOLITAN AREA..REMAINS IN THE SEVERE THUNDERSTORM WATCH UNTIL MIDNIGHT. A FLASH FLOOD WATCH IS ALSO IN EFFECT UNTIL 400 AM IN SOUTHEAST AND SOUTH CENTRAL MINNESOTA FROM RED WING TO NEW ULM SOUTH TO THE IOWA BORDER. WISCONSIN. MOVEMENT WfAS TO THE EAST AT 20 MILES AN HOUR. AS OF 1250 PM...NO SEVERE THUNDERSTORM WARNINGS WERE IN EFFECT...THE MAJOR THREAT AT THIS POINT IS THE DANGEROUS LIGHTNING AND POSSIBILITY OF STREET FLOODING ESPECIALLY AROUND THE TWIN CITIES.
Special weather statement, Jul 17, 10:16 PM CDT, 13 minutes before
MNZALL-180400- SPECIAL WEATHER STATEMENT..CORRECTION TO DELETE GARBLE AT END NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 1005 PM CDT WED JUL 17 1991 ...SEVERE THUNDERSTORM WATCH 687 CANCELLED FOR CENTRAL MINNESOTA... SEVERE THUNDERSTORM WATCH NUMBER 687 HAS BEEN CANCELLED NORTH OF A LINE FROM FOREST LAKE IN EAST CENTRAL MINNESOTA TO JUST SOUTH OF WILLMAR. THE WATCH HAS ALSO BEEN CANCELLED WEST OF A LINE FROM REDWOOD FALLS TO ST JAMES. SOUTHERN MINNESOTA..INCLUDING THE TWIN CITIES METROPOLITAN AREA..REMAINS IN THE SEVERE THUNDERSTORM WATCH UNTIL MIDNIGHT. A FLASH FLOOD WATCH IS ALSO IN EFFECT UNTIL 400 AM IN SOUTHEAST AND SOUTH CENTRAL MINNESOTA FROM RED WING TO NEW ULM SOUTH TO THiE IOWA BORDER.
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 7:29 PM CDT | Severe Thunderstorm Warning | MPX | Pope, Stearns | 53 min |
| Jul 17, 8:10 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Yellow Medicine | 35 min |
| Jul 17, 8:27 PM CDT | Severe Thunderstorm Warning | MPX | Redwood, Renville | 48 min |
| Jul 17, 9:07 PM CDT | Severe Thunderstorm Warning | MPX | Renville | 53 min |
| Jul 17, 9:54 PM CDT | Severe Thunderstorm Warning | MPX | Renville | 24 min |
| Jul 17, 9:54 PM CDT | Severe Thunderstorm Warning | MPX | McLeod, Sibley | 36 min |
| Jul 17, 10:34 PM CDT | Severe Thunderstorm Warning | MPX | Nicollet | 41 min |
| Jul 18, 4:48 PM CDT | Severe Thunderstorm Warning | MPX | Todd | 42 min |
| Jul 18, 5:16 PM CDT | Severe Thunderstorm Warning | MPX | Pope | 44 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 1991Every severe thunderstorm warning in 1991
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.