Wisconsin, 2002

Flash Flood in Wisconsin, June 11, 2002

June 11, 2002 · NWS GRB · 1 event in 1 county or zone

Abundant moisture combined with a very unstable atmosphere resulted in the development of thunderstorms with torrential rains. As much as two feet of water covered some roads in the western part of the county.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS GRB wrote it up.

Abundant moisture combined with a very unstable atmosphere resulted in the development of thunderstorms with torrential rains. As much as two feet of water covered some roads in the western part of the county.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Green Bay, WI wrote its last area forecast discussion before the first event at Jun 10, 2:45 PM CST, 10 hours 55 minutes earlier.

Area forecast discussion, Jun 10, 2:45 PM CST, 10 hours 55 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
345 PM CDT MON JUN 10 2002

MAIN FORECAST CONCERNS ARE WITH CONVECTION TONIGHT INTO TOMORROW AND
HIGH TEMPERATURES TUESDAY.

THUNDERSTORMS DEVELOPED IN THE VERY WARM AND HUMID AIRMASS OVER
WISCONSIN LATE THIS MORNING AND AFTERNOON. THESE APPEAR TO HAVE
DEVELOPED IN THE VICINITY OF AN OUTFLOW BOUNDARY FROM EARLIER CONVECTION
IN NORTHEAST IOWA. LIFTED INDEX VALUES AT 19Z WERE -5 OR LOWER ACROSS
THE SOUTHWEST PART OF THE FORECAST AREA. TEMPERATURES WERE GENERALLY IN
THE UPPER 70S TO MIDDLE 80S WITH DEW POINTS AROUND 70. WV IMAGERY
INDICATES SHORT WAVE ENERGY MOVING INTO THE AREA. MODELS FORECAST
ANOTHER SHORT WAVE INTO THE STATE TONIGHT SO SHOWERS AND THUNDERSTORMS
SEEM LIKE A GOOD BET TONIGHT.

ON TUESDAY MODELS BRING SOME DRIER AIR INTO THE STATE BEFORE SIGNIFICANT
COLD ADVECTION TAKES PLACE. THIS SHOULD ALLOW TEMPERATURES TO WARM QUITE
A BIT BEFORE THE FRONT BRINGS COLDER AIR.

.GRB...NONE.

MG
WWW.CRH.NOAA.GOV/GRB

The radar

The Green Bay radar (KGRB), 138 km away, was scanning. The volume nearest the first event began at 07:39 UTC.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Marathon

When
June 11, 1:40 AM CST to 2:30 AM CST
Where
Marathon County, West Portion
Reported by
LAW ENFORCEMENT
Coordinates
44.898, -89.759 (the zone’s center; the record gives no point)

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Wisconsin in 2002Every state in 2002This day in weather historyWarnings in Wisconsin, June 2002

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5306357.