Alert archive / Wisconsin / Flash Flood Warnings in 1991
Flash Flood Warning 1, NWS Milwaukee, WI
NWS Milwaukee, WI issued this flash flood warning at Jul 21, 1991, 2:56 AM CDT for Dodge County, Washington County, Wisconsin. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 21, 1991, 2:56 AM CDT (07:56 UTC)
- Expired
- Jul 21, 1991, 6:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
Counties Dodge County, WI, Washington County, WI
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 00:00Z, 7.9 hours before the alert went out and 124 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
- 2260 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 319 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 15.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMKE 210802 FFWMKE WIC027-131-212000- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 256 AM CDT SUN JUL 21 1991 THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 600 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST WISCONSIN ...DODGE COUNTY...WASHINGTON COUNTY FLOODING IS OCCURRING OVER NORTHERN DODGE COUNTY...WHERE BETWEEN 2 AND 3 INCHES OF RAIN HAVE FALLEN. ROADS IN THE TOWN OF LEROY...ABOUT 15 MILES SOUTH OF FOND DU LAC...ARE COMPLETELY UNDER WATER AND FULL OF DEBRIS. HEAVY RAIN WILL CONTINUE TO FALL OVER NORTHERN AND CENTRAL DODGE AND WASHINGTON COUNTIES UNTIL AT LEAST 600 AM. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO *HIGHER GROUND. J LAST
What forecasters said that day
The local office's own words before this flash flood 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 20, 10:02 PM CDT, 4 hours 54 minutes before
WIZ015-016-017-210400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1000 PM CDT SAT JUL 20 1991 ...THUNDERSTORMS INCREASING ACROSS SOUTHERN AND EASTERN WISCONSIN... AT 955 PM CDT NATIONAL WEATHER SERVICE RADAR INDICATED SHOWERS AND THUNDERSTORMS INCREASING ACROSS SOUTHERN AND EASTERN WISCONSIN LATE THIS EVENING. THE SHOWERS EXTENDED FROM NEAR LONE ROCK EAST NORTHEAST TO SOUTHERN FOND DU LAC COUNTY...ABOUT 15 MILES SOUTHEAST OF FOND DU LAC. THE HEAVIEST SHOWERS AND THUNDERSTORMS WERE LOCATED IN DODGE COUNTY... SOUTH OF BEAVER DAM WHICH IS 50 MILES NORTHWEST OF MILWAUKEE...AND ALSO JUST NORTH OF MADISON IN SOUTHEAST COLUMBIA COUNTY. BRIEF VERY HEAVY RAINS...GUSTY WINDS AND SMALL HAIL ARE POSSIBLE WITH THESE THUNDERSTORMS TONIGHT. THEY WILL CONTINUE TO DEVELOP AND MOVE TO THE EAST AT 30 MPH. DAVIS
Special weather statement, Jul 20, 10:11 PM CDT, 4 hours 45 minutes before
WIZ011-015-018-019-210500- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MADISON WI 1010 PM CDT SAT JUL 19 1991 ...STRONG THUNDERSTORMS INCREASING ACROSS SOUTH-CENTRAL WISCONSIN... AT 1005 PM CDT RADAR DETECTED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM 50 MILES WEST OF MADISON NEAR LONE ROCK TO 75 MILES NORTHEAST OF MADISON NEAR SHEBOYGAN...MOVEMENT WAS EAST AT 30 MPH. THE STRONGEST OF THESE STORMS WERE LOCATED TO THE NORTH OF MADISON ACROSS NORTHERN DANE AND SOUTHERN COLUMBIA COUNTIES. PERSONS IN DEFOREST...BRISTOL...ARLINGTON AND COLUMBUS CAN EXPECT PERIODS OF THUNDERSTORMS WITH VERY HEAVY RAINS AND FREQUENT LIGHTNING FOR THE NEXT HOUR OR SO. OTHERS IN SOUTH-CENTRAL WISCONSIN CAN EXPECT SCATTERED THUNDERSTORMS THROUGH OUT THE NIGHT. ABUNDANT MOISTURE IN THE ATMOSPHERE WILL LEAD TO LOCALLY HEAVY RAINS TONIGHT. NOAH
Special weather statement, Jul 20, 11:10 PM CDT, 3 hours 46 minutes before
WIZ011-015-018-019-210600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MADISON WI 1110 PM CDT SAT JUL 19 1991 ...STRONG THUNDERSTORMS OVER PARTS OF SOUTH-CENTRAL WISCONSIN... AT 1100 PM CDT RADAR DETECTED SCATTERED STRONG THUNDERSTORMS...SOME WITH VERY HEAVY RAINS...EXTENDING FROM MADISON TO 70 MILES NORTH OF MADISON NEAR WAUTOMA...MOVEMENT WAS EAST AT 30 MPH. THE STRONGEST OF THE STORMS WAS LOCATED 5 MILES NORTH OF THE MADISON AIRPORT OVER DE FOREST. THIS STORM WILL MOVE EAST TOWARD SUN PRARIE AND EAST BRISTOL. PAST HISTORY OF THESE STORMS INDICATED LOCALLY HEAVY RAINS AND FREQUENT LIGHTNING. THE REST OF SOUTH-CENTRAL WISCONSIN WAS RELATIVELY QUITE WEATHER-WISE. SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE AGAIN TONIGHT. WITH ABUNDANT MOISTURE...LOCALLY HEAVY RAINS ARE POSSIBLE. NOAH
Special weather statement, Jul 21, 12:52 AM CDT, 2 hours 4 minutes before
WIZ012-013-017-210630- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1250 AM CDT SUN JUL 21 1991 ...THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE TO MOVE OVER EAST-CENTRAL WISCONSIN... AT 1245 AM...NATIONAL WEATHER SERVICE RADAR INDICATED SHOWERS AND THUNDERSTORMS OVER PORTIONS OF EAST-CENTRAL AND SOUTHEAST WISCONSIN. THE STRONGEST STORMS...PRODUCING VERY HEAVY RAIN AND INTENSE LIGHTNING... WERE LOCATED OVER MUCH OF FOND DU LAC COUNTY. ALTHOUGH THE THUNDERSTORMS ARE MOVING EAST AT ABOUT 35 MILES AN HOUR... MORE STORMS WERE DEVELOPING WEST OF FOND DU LAC COUNTY AND MOVING OVER ALREADY RAIN-SOAKED GROUND. IF YOU ARE PLANNING TO TRAVEL EARLY THIS SUNDAY MORNING...BE PREPARED FOR REDUCED VISIBILITIES DUE TO HEAVY RAIN AND SOME MINOR FLOODING OF LOW-LYING ROADWAYS. DO NOT CROSS A ROAD COVERED BY WATER OF UNKNOWN DEPTH. STAY TUNED TO NATIONAL WEATHER SERVICE RADIO...OR COMMERCIAL RADIO OR TELEVISION FOR LATER STATEMENTS CONCERNING THESE STORMS. J LAST
Special weather statement, Jul 21, 2:12 AM CDT, 44 minutes before
WIZ011-012-013-015-016-017-211000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 200 AM CDT SUN JUL 21 1991 ...THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUE TO POUND PARTS OF CENTRAL AND EAST CENTRAL WISCONSIN... AT 155 AM...NATIONAL WEATHER SERVICE RADAR STILL SHOWED A BAND OF THUNDERSTORMS OVER PORTIONS OF CENTRAL AND EAST CENTRAL WISCONSIN. THE STRONGEST STORMS...PRODUCING VERY HEAVY RAIN AND INTENSE LIGHTNING... WERE LOCATED OVER SOUTHERN PORTIONS OF MARQUETTE...GREEN LAKE...AND FOND DU LAC COUNTIES...AND NORTHERN PORTIONS OF COLUMBIA AND DODGE COUNTIES. NEW STORMS CONTINUE TO DEVELOP AND MOVE ACROSS THIS SAME GENERAL AREA OF ALREADY SATURATED GROUND...INCREASING THE POTENTIAL FOR FLOODING OF LOW LYING AREAS. THIS BAND OF STORMS APPEARS TO BE SAGGING VERY SLOWLY SOUTHWARD INTO SOUTHEAST WISCONSIN. THIS MEANS THE HEAVY RAIN POTENTIAL SHOULD EXPAND FURTHER INTO COLUMBIA AND DODGE COUNTIES...AND PROBABLY INTO WASHINGTON AND OZAUKEE COUNTIES DURING THE NEXT FEW HOURS. IF YOU ARE PLANNING TO TRAVEL EARLY THIS MORNING...BE PREPARED FOR REDUCED VISIBILITIES DUE TO HEAVY RAIN AND SOME FLOODING OF ROADWAYS. DO NOT CROSS A ROAD COVERED BY WATER OF UNKNOWN DEPTH. STAY TUNED TO NATIONAL WEATHER SERVICE RADIO...OR COMMERCIAL RADIO OR TELEVISION FOR LATER STATEMENTS CONCERNING THESE STORMS. JOHNSTON
Nearby
Flash Flood Warnings in Wisconsin, 1991Every flash flood 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.