Dense Fog, Sauk
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Sauk forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.427, -89.948 (the zone’s center; the record gives no point)
Dense Fog in Wisconsin, August 3, 2001
Dense fog developed overnight and reduced visibilities to zero to 1/4 mile. At least a couple dozen vehicle accidents were noted in newspapers, and many airplane flights were delayed or cancelled.
Where it happened
Every event with a place to put it; 14 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 14
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 MKX wrote it up.
Dense fog developed overnight and reduced visibilities to zero to 1/4 mile. At least a couple dozen vehicle accidents were noted in newspapers, and many airplane flights were delayed or cancelled. The dense fog was the result of clear skies, a light northeast wind, and evaporation of moisture from rains on August 2nd.
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 Milwaukee, WI wrote its last area forecast discussion before the first event at Aug 2, 1:30 PM CST, 10 hours 30 minutes earlier.
Area forecast discussion, Aug 2, 1:30 PM CST, 10 hours 30 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 230 PM CDT THU AUG 2 2001 FCST FOCUS IS ON AMT OF RELIEF COMING IN BHND EXITING CDFNT. THIS FNT IS A LTL HARD TO FIND THIS AFTN GIVEN WEAK WND FIELD AND LINGERING HI DWPTS. BEST EST IS NE-SW ACRS EXTRM SE WI. THERE IS STILL SOME POTENTIAL FOR CNVTV DVLPT TDA NR THE BDRY BEFORE IT DROPS DOWN INTO NRN IL. WEAK LO LVL CNVGC PERSISTS WITH MODEL LI'S STILL IN THE NEGATIVE NUMBERS. BUT MOST FAVORED AREA APPRS TO BE NR OLD OUTFLOWS NOW DOWN IN IL FM THIS MRNGS CNVTN. CORE OF IA CLUSTER ALSO APPRS TO BE HEADED FOR IL. ONLY SUBTLE COOLING/DRYING EXPECTED AFTER FROPA. LGT WINDS AND STILL FAIRLY MOIST AIR TONIGHT AFTER THE ERLYR HEAVY RAINFALL MAY LEAD TO SOME FOG DVLPT. DEWPOINTS ONLY LOWER INTO THE 60S. REST OF PD LOOKS QUIET ATTM AS SFC HI DRFTS SWD ACRS CWA. NO ARGUMENT WITH GUID MAXES STILL WELL INTO THE 80S AWAY FM LAKE MI. .MKX...NONE.m NJ
The radar
The national radar mosaic for the moment the first event began.
Event by event
14 dense fog. Local standard time, as filed.
Dense Fog, Dodge
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Dodge forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.416, -88.707 (the zone’s center; the record gives no point)
Dense Fog, Washington
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Washington forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.369, -88.231 (the zone’s center; the record gives no point)
Dense Fog, Ozaukee
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Ozaukee forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.403, -87.891 (the zone’s center; the record gives no point)
Dense Fog, Iowa
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Iowa forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.001, -90.135 (the zone’s center; the record gives no point)
Dense Fog, Jefferson
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Jefferson forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.021, -88.776 (the zone’s center; the record gives no point)
Dense Fog, Waukesha
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Waukesha forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.018, -88.304 (the zone’s center; the record gives no point)
Dense Fog, Milwaukee
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Milwaukee forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 43.022, -87.929 (the zone’s center; the record gives no point)
Dense Fog, Lafayette
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Lafayette forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.661, -90.132 (the zone’s center; the record gives no point)
Dense Fog, Green
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Green forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.680, -89.602 (the zone’s center; the record gives no point)
Dense Fog, Rock
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Rock forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.671, -89.072 (the zone’s center; the record gives no point)
Dense Fog, Walworth
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Walworth forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.669, -88.542 (the zone’s center; the record gives no point)
Dense Fog, Racine
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Racine forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.730, -87.812 (the zone’s center; the record gives no point)
Dense Fog, Kenosha
- When
- August 3, 12:00 AM CST to 8:00 AM CST
- Where
- Kenosha forecast zone
- Reported by
- AWOS,ASOS,MESONET,ETC
- Coordinates
- 42.573, -87.840 (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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Flash Flood in Kentucky, August 3 to 4, 2001
- Heat in Texas, August 3, 2001
- Flash Flood in Kentucky, August 3 to 4, 2001
- Hail and Lightning Strikes in Massachusetts, August 3, 2001
- Flash Flooding and Damaging Wind in Iowa, August 3, 2001
- Lightning Strike in New Mexico, August 3, 2001
- Flash Flood and Damaging Winds in New York, August 3, 2001
- Hurricane in Guam, August 3 to 4, 2001
- Flash Flood in New York, August 3, 2001
- Flash Flood in Colorado, August 3, 2001
- Damaging Wind in Massachusetts, August 3, 2001
- Flash Flood in Kentucky, August 3, 2001
More
Every storm in Wisconsin in 2001Every state in 2001This day in weather historyWarnings in Wisconsin, August 2001
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: 5266723, 5266724, 5266725, 5266726, 5266727, 5266728, 5266729, 5266730, 5266731, 5266732, 5266733, 5266734, 5266735, 5266736.