Alert archive / Wisconsin / Flash Flood Warnings in 1998

Flash Flood Warning 19, NWS Milwaukee, WI

August 6, 1998Milwaukee County, Ozaukee County, Washington County, Wisconsin

NWS Milwaukee, WI issued this flash flood warning at Aug 6, 1998, 3:05 PM CDT for Milwaukee County, Ozaukee County, Washington County, Wisconsin. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 6, 1998, 3:05 PM CDT (20:05 UTC)
Expired
Aug 6, 1998, 8:00 PM CDT
In force
5 hr
Issued by
NWS Milwaukee, WI
Area
Whole counties

Counties Milwaukee County, WI, Ozaukee County, WI, Washington County, WI

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.1 hours before the alert went out and 135 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.

Skew-T log-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 1998-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 1998-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
53 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
524 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMKE 062006
FFWMKE
WIC079-089-131-070105-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
305 PM CDT THU AUG 6 1998

THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN WI HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MILWAUKEE COUNTY IN SOUTHEASTERN WISCONSIN
  OZAUKEE COUNTY IN SOUTHEASTERN WISCONSIN
  WASHINGTON COUNTY IN SOUTHEASTERN WISCONSIN

* UNTIL 800 PM CDT

* AT 3 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SCATTERED HEAVY THUNDERSTORMS OVER SOUTHEAST WISCONSIN. THE
  STORMS WERE MOVING VERY SLOWLY NORTHWARD AT AROUND 10 MPH.

* LOCALIZED TORRENTIAL RAINS WITH RAINFALL AMOUNTS BETWEEN 1 AND 2
  INCHES PER HOUR ARE INDICATED WITH SOME OF THESE STORMS. THE
  STORMS ARE EXPECTED TO PERSIST INTO THE EVENING HOURS.


MOTORISTS SHOULD BE ESPECIALLY CAREFUL AT NIGHT AND AVOID DRIVING
INTO MOVING WATER OF UNKNOWN DEPTH...LOW WATER CROSSINGS AND FLOOD
PRONE AREAS.

MK

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, Aug 6, 11:03 AM CDT, 4 hours 2 minutes before
WIZ046-047-051-052-056>060-062>072-070000-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
1103AM CDT THU AUG 6 1998

...NO RISK OF SEVERE THUNDERSTORMS TODAY OR TONIGHT...
...FOR SOUTH CENTRAL AND SOUTHEAST WISCONSIN...

DISCUSSION...
A VERY MOIST ATMOSPHERE COMBINED WITH LOW PRESSURE MOVING VERY SLOWLY
THROUGH EASTERN IOWA AND WESTERN ILLINOIS WILL SET THE STAGE FOR
SHOWERS AND THUNDERSTORMS TO BECOME MORE NUMEROUS ACROSS SOUTHEAST AND
SOUTH CENTRAL WISCONSIN THIS AFTERNOON AND TONIGHT. THE STORMS SHOULD
NOT BE SEVERE...BUT WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL.

SPOTTER ACTION...
STORM SPOTTER GROUPS WILL NOT BE NEEDED FOR ACTIVATION THIS AFTERNOON
OR TONIGHT ACROSS SOUTH CENTRAL AND SOUTHEAST WISCONSIN.

ZAJDEL

The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 5, 9:00 PM CDTFlash Flood WarningMKXRock, Walworth3 hr
Aug 5, 11:59 PM CDTFlash Flood WarningMKXRock, Walworth6 hr
Aug 6, 6:22 AM CDTFlash Flood WarningMKXSheboygan4 hr
Aug 6, 2:04 PM CDTFlash Flood WarningMKXDodge, Jefferson, Waukesha6 hr
Aug 6, 2:04 PM CDTFlash Flood WarningMKXColumbia, Dane, Green6 hr
Aug 6, 2:04 PM CDTFlash Flood WarningMKXLafayette6 hr
Aug 6, 6:00 PM CDTFlash Flood WarningMKXRock, Walworth2 hr

Nearby

Flash Flood Warnings in Wisconsin, 1998Every flash flood warning in 1998

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.