Wisconsin, 1999

Heat and Dense Fog in Wisconsin, February 11, 1999

February 11, 1999 · NWS GRB · 26 events in 19 counties and zones

Southerly winds ahead of an approaching cold front brought unseasonably warm and moist air into Wisconsin. Much of central and northeast Wisconsin still had snow on the ground and the warm, moist air moving over the snow-covered ground resulted in widespread dense fog.

Where it happened

Every event with a place to put it; 26 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

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
26

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.

Southerly winds ahead of an approaching cold front brought unseasonably warm and moist air into Wisconsin. Much of central and northeast Wisconsin still had snow on the ground and the warm, moist air moving over the snow-covered ground resulted in widespread dense fog. Near zero visibility was common across much of central and northeast Wisconsin, resulting in numerous vehicular accidents.New record high temperatures were set at Green Bay (58 degrees), Oshkosh (59 degrees) and Wisconsin Rapids (52 degrees). Wausau tied their high temperature record (48 degrees).

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

17 dense fog, 9 heat. Local standard time, as filed.

Dense Fog, Wood

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Wood forecast zone
Reported by
NEWSPAPER
Coordinates
44.455, -90.042 (the zone’s center; the record gives no point)

Dense Fog, Langlade

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Langlade forecast zone
Reported by
NEWSPAPER
Coordinates
45.262, -89.072 (the zone’s center; the record gives no point)

Dense Fog, Winnebago

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Winnebago forecast zone
Reported by
NEWSPAPER
Coordinates
44.069, -88.645 (the zone’s center; the record gives no point)

Dense Fog, Portage

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Portage forecast zone
Reported by
NEWSPAPER
Coordinates
44.476, -89.501 (the zone’s center; the record gives no point)

Dense Fog, Outagamie

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Outagamie forecast zone
Reported by
NEWSPAPER
Coordinates
44.416, -88.465 (the zone’s center; the record gives no point)

Dense Fog, Waupaca

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Waupaca forecast zone
Reported by
NEWSPAPER
Coordinates
44.470, -88.965 (the zone’s center; the record gives no point)

Dense Fog, Vilas

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Vilas forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
46.053, -89.515 (the zone’s center; the record gives no point)

Dense Fog, Oneida

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Oneida forecast zone
Reported by
AWOS,ASOS,MESONET,ETC
Coordinates
45.706, -89.522 (the zone’s center; the record gives no point)

Dense Fog, Lincoln

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Lincoln forecast zone
Reported by
UNKNOWN
Coordinates
45.338, -89.735 (the zone’s center; the record gives no point)

Dense Fog, Marathon

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Marathon forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.898, -89.759 (the zone’s center; the record gives no point)

Dense Fog, Shawano

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Shawano forecast zone
Reported by
UNKNOWN
Coordinates
44.789, -88.765 (the zone’s center; the record gives no point)

Dense Fog, Menominee

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Menominee forecast zone
Reported by
UNKNOWN
Coordinates
45.004, -88.710 (the zone’s center; the record gives no point)

Dense Fog, Oconto

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Oconto forecast zone
Reported by
UNKNOWN
Coordinates
44.999, -88.221 (the zone’s center; the record gives no point)

Dense Fog, Forest

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Forest forecast zone
Reported by
UNKNOWN
Coordinates
45.667, -88.770 (the zone’s center; the record gives no point)

Dense Fog, Florence

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Florence forecast zone
Reported by
UNKNOWN
Coordinates
45.848, -88.398 (the zone’s center; the record gives no point)

Dense Fog, Marinette

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Marinette forecast zone
Reported by
UNKNOWN
Coordinates
45.351, -88.002 (the zone’s center; the record gives no point)

Dense Fog, Waushara

When
February 11, 5:00 AM CST to 1:00 PM CST
Where
Waushara forecast zone
Reported by
UNKNOWN
Coordinates
44.113, -89.243 (the zone’s center; the record gives no point)

Heat, Brown

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Brown forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.474, -87.993 (the zone’s center; the record gives no point)

Heat, Marathon

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Marathon forecast zone
Reported by
OFFICIAL NWS OBS.
Coordinates
44.898, -89.759 (the zone’s center; the record gives no point)

Heat, Winnebago

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Winnebago forecast zone
Reported by
NEWSPAPER
Coordinates
44.069, -88.645 (the zone’s center; the record gives no point)

Heat, Wood

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Wood forecast zone
Reported by
NEWSPAPER
Coordinates
44.455, -90.042 (the zone’s center; the record gives no point)

Heat, Waushara

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Waushara forecast zone
Reported by
UNKNOWN
Coordinates
44.113, -89.243 (the zone’s center; the record gives no point)

Heat, Portage

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Portage forecast zone
Reported by
UNKNOWN
Coordinates
44.476, -89.501 (the zone’s center; the record gives no point)

Heat, Waupaca

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Waupaca forecast zone
Reported by
UNKNOWN
Coordinates
44.470, -88.965 (the zone’s center; the record gives no point)

Heat, Outagamie

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Outagamie forecast zone
Reported by
UNKNOWN
Coordinates
44.416, -88.465 (the zone’s center; the record gives no point)

Heat, Calumet

When
February 11, 9:00 AM CST to 6:00 PM CST
Where
Calumet forecast zone
Reported by
UNKNOWN
Coordinates
44.082, -88.218 (the zone’s center; the record gives no point)

What these are

Dense Fog
Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.
Heat
Heat below excessive heat criteria that still caused deaths, injuries or significant impacts.

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

The same day elsewhere

More

Every storm in Wisconsin in 1999Every state in 1999This day in weather historyWarnings in Wisconsin, February 1999

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 2026-10-01. Each event’s entry at NCEI: 5683346, 5683347, 5683348, 5683349, 5683350, 5683351, 5683352, 5683353, 5683354, 5683355, 5683356, 5683357, 5683358, 5683359, 5683360, 5683361, 5683362, 5683337, 5683338, 5683339, 5683340, 5683341, 5683342, 5683343, 5683344, 5683345.