Alert archive / Minnesota / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 119, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 1991, 8:34 PM CDT for Hennepin County, Minnesota. It was in force for 26 min.
The area
The counties it named.
The facts
- Issued
- Jul 21, 1991, 8:34 PM CDT (01:34 UTC)
- Expired
- Jul 21, 1991, 9:00 PM CDT
- In force
- 26 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Hennepin County, MN
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 1.6 hours before the alert went out and 20 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
- 2851 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 775 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMSP 220130 SVRMSP MNC053-220200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MINNEAPOLIS MN 834 PM CDT SUN JUL 21 1991 THE NATIONAL WEATHER SERVICE IN MINNEAPOLIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 900 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN EAST CENTRAL MINNESOTA ...SOUTHERN HENNEPIN COUNTY 60 MPH WINDS HAVE BEEN REPORTED AT 825 PM THIS EVENING AT PORTLAND AND 90 STREET IN THE SOUTH METRO OF THIS TWIN CITIES. A LARGE CLUSTER OF THUNDERSTORMS...ALL CAPABLE OF WINDS THIS STRONG ARE DRIFTING NORTH AT 15 MPH AND COULD REALISTICALLY EFFECT THE TWIN CITES AND SOUTH METRO AREA TIL 9 PM THIS EVENING. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE ADVANCE WARNING SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. TOGSTAD
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 21, 7:00 PM CDT, 1 hour 34 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 650 PM CDT SUN JUL 21 1991 ...FLASH FLOOD WATCH FOR MUCH OF SOUTHERN MINNESOTA FOR TONIGHT...INCLUDING THE TWIN CITIES METRO AREA... ...A LINE OF THUNDERSTORMS 40 MILES SOUTH OF THE TWIN CITIES WAS BEGINING TO MOVE NORTHWARD AT 10 MPH AND AT THIS RATE WILL BE IN THE SOUTHERN TWIN CITIES METRO AREA BETWEEN 730 AND 800 PM... AT 640 PM...POWERFUL THUNDERSTORMS CONTINUE DEVELOP OVER SOUTH CENTRAL AND SOUTHEAST MINNESOTA...SOUTH OF THE TWIN CITIES...AND MORE POWERFUL STORMS WERE MOVING INTO WESTERN MINNESOTA FROM THE DAKOTAS. SOME OF THESE STORMS WERE PRODUCING INTENSE FLOODING TYPE RAINFALLS...STRONG GUSTY WINDS OF 50 TO 60 MPH AND POSSIBLY SOME HAIL. THE MOST INTENSE RAINFALL WAS IN SOUTHEAST MINNESOTA NEAR THE MISSISSIPPI RIVER IN WINONA COUNTY BETWEEN ROCHESTER AND WINONA...NEAR FEEMONT AND UTICA. ANOTHER AREA OF STRONG THUNDERSTORMS WAS OVER SOUTH CENTRAL MINNESOTA...SOUTH OF NEW ULM. AND FROM MANKATO AND EAST TO WASECA AND OWATONNA. THIS IS A DANGEROUS WEATHER SITUATION...BECAUSE THE POTENTIAL FOR FLOODING AND SEVERE WEATHER IS VERY HIGH OVER SOUTHERN MINNESOTA...THIS EVENING. BE PREPARED FOR THE W ORST AND...BE PREPARED TO MOVE TP A PLACE OF SAFETY IF SEVERE WEATHER APPROACHES OR IF FLOODING IS OCCURRING.
Special weather statement, Jul 21, 7:14 PM CDT, 1 hour 20 minutes before
MNZALL-220100- SPECIAL WEATHER STATEMENT...CORRECTED FOR CODING... NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 650 PM CDT SUN JUL 21 1991 ...FLASH FLOOD WATCH FOR MUCH OF SOUTHERN MINNESOTA FOR TONIGHT...INCLUDING THE TWIN CITIES METRO AREA... ...A LINE OF THUNDERSTORMS 40 MILES SOUTH OF THE TWIN CITIES WAS BEGINING TO MOVE NORTHWARD AT 10 MPH AND AT THIS RATE WILL BE IN THE SOUTHERN TWIN CITIES METRO AREA BETWEEN 730 AND 800 PM... AT 640 PM...POWERFUL THUNDERSTORMS CONTINUE DEVELOP OVER SOUTH CENTRAL AND SOUTHEAST MINNESOTA...SOUTH OF THE TWIN CITIES...AND MORE POWERFUL STORMS WERE MOVING INTO WESTERN MINNESOTA FROM THE DAKOTAS. SOME OF THESE STORMS WERE PRODUCING INTENSE FLOODING TYPE RAINFALLS...STRONG GUSTY WINDS OF 50 TO 60 MPH AND POSSIBLY SOME HAIL. THE MOST INTENSE RAINFALL WAS IN SOUTHEAST MINNESOTA NEAR THE MISSISSIPPI RIVER IN WINONA COUNTY BETWEEN ROCHESTER AND WINONA...NEAR FEEMONT AND UTICA. ANOTHER AREA OF STRONG THUNDERSTORMS WAS OVER SOUTH CENTRAL MINNESOTA...SOUTH OF NEW ULM. AND FROM MANKATO AND EAST TO WASECA AND OWATONNA THIS IS A DANGEROUS WEATHER SITUATION...BECAUSE THE POTENTIAL FOR FLOODING AND SEVERE WEATHER IS VERY HIGH OVER SOUTHERN MINNE:SOTA...THIS EVENING. BE PREPARED FOR THE WORST AND...BE PREPARED TO MOVE TP A PLACE OF SAFETY IF SEVERE WEATHER APPROACHES OR IF FLOODING IS OCCURRING.
Special weather statement, Jul 21, 7:46 PM CDT, 48 minutes before
MNZALL-220230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MINNEAPOLIS/ST PAUL MN 745 PM CDT SUN JUL 21 1991 ...STRONG THUNDERSTORMS MOVING INTO THE SOUTHERN PORTIONS OF THE TWIN CITIES METROPOLITIAN AREA... ...SEVERE THUNDERSTORM WATCH POSTED FOR SOUTHERN MINNESOTA UNTIL MIDNIGHT...INCLUDNG THE TWIN CITIES... ...TORNADO WATCH CONTINUES FOR SOUTHWEST AND WEST CENTRAL MINNESOTA TILL 11 PM CDT... POWERFUL THUNDERSTORMS CONTINUE DEVELOP AND MOVE NORTHWARD FROM ACROSS SOUTHERN MINNESOTA. THE LEADING EDGE OF THIS AREA WAS CROSSING INTO THE SOUTHERN COUNTIES OF THE TWIN CITIES METROPOLITIAN AREA. THESE STORMS HAVE THE POTIENTAL TO TORRENTIAL RAINS...LARGE HAIL...STONG WINDS AND DANGEROUS LIGHTNING. THE STRONGEST OF THESE STORMS EXTENDED FROM CENTRAL SIBLEY COUNTY EAST INTO WESTERN SCOTT COUNTY. THESE STORMS WILL MOVE NORTHWARD INTO THE HEART OF THE METROPOLITIAN AREA DURNG THE NEXT SEVERAL HOURS. PERSONS OUT AND ABOUT SHOULD KEEP A WATCHFUL EYE ON THE SKY AND LISTEN FOR FURTHER STATEMENTS OR WARNING CONCERNING THESE POTIENTALLY DANGEROUS STORMS. IN ADDITION A FLASH FLOOD WATCH ALSO REMAIN IN EFFECT FOR MUCH OF SOUTHERN TONIGHT. BECAUSE THE POTENTIAL FOR FLOODING AND SEVERE WEATHER IS VERY HIGH PERSONS IN THE WATCH AREA MUST BE PREPARED FOR THE WORST AND...BE PREPARED TO MOVE TO A PLACE OF SAFETY IF SEVERE WEATHER APPROACHES OR IF FLOODING IS OCCURRING. OTHER SEVERE THUNDERSTORMS WERE DROPING SOUTHEAST ALONG THE MINNESOTA RIVER WHERE WARNING HAVEBEEN POSTED FOR THE THREAT OF LARGE HAIL AND STRONG WINDS. TO THE SOUTHEAST ALONG THE MISSISSIPPI RIVER FROM RED WING TO NORTH OF CALADONIA POWERFUL THUNDERSTORMS ARE ALSO PRODUCING GOLFBALL DIAMETER HAIL AND RAgIN IN THE 1-2 INCH RANGE. ACROSS SOUTHERN MINNESOTA THESE THUNDERSTORMS WERE MOVING NORTH AT 10 TO 15 MPH WHILE THE STRONG ACTIVITY IN WEST CENTRAL MINNESOTA WAS DROPPING SOUTHEAST AT 15 TO 20 MPH. DOMBROWSKY
The office that day
Everything else NWS Twin Cities, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:33 PM CDT | Severe Thunderstorm Warning | MPX | Lac qui Parle | 57 min |
| Jul 21, 7:41 PM CDT | Flash Flood Warning | MPX | Goodhue, Olmsted, Wabasha, Winona | 2 hr |
| Jul 21, 8:17 PM CDT | Severe Thunderstorm Warning | MPX | Chippewa, Lac qui Parle, Swift | 58 min |
| Jul 21, 10:10 PM CDT | Flash Flood Warning | MPX | Wabasha, Winona | 2 hr |
| Jul 21, 11:55 PM CDT | Flash Flood Warning | MPX | Wabasha, Winona | 5 hr |
| Jul 22, 1:57 AM CDT | Flash Flood Warning | MPX | Dodge, Goodhue, Olmsted, Steele | 3 hr |
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.