Iowa, 2020Dense Fog in Iowa, March 19, 2020
March 19, 2020 · NWS ARX · 1 event in 1 county or zone
One person was killed and another injured when two semi's collided southeast of Monona (Clayton County) in dense fog. S.
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- Deaths
- 1
- Injuries
- 1
- Property damage
- $85,000
- 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.
One person was killed and another injured when two semi's collided southeast of Monona (Clayton County) in dense fog. The driver of one semi failed to stop at an intersection of U.S. Highway 52 and State Highway 13 and collided with the second semi. One of the trucks was transporting lead-acid batteries that were strewn across the roads. A hazard materials team had to be brought in for clean up, requiring the roads to be closed for much of the day. The visibility at the time of the accident was likely reduced to less than a half mile due to dense fog.
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 La Crosse, WI wrote its last area forecast discussion before the first event at Mar 19, 1:39 AM CST, 2 hours 21 minutes earlier.
Area forecast discussion, Mar 19, 1:39 AM CST, 2 hours 21 minutes before
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</html>Hazardous weather outlook, Mar 19, 2:37 AM CST, 1 hour 23 minutes before
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</html>Dense Fog, Clayton
- When
- March 19, 4:00 AM CST to 10:15 AM CST
- Where
- Clayton forecast zone
- Deaths
- 0 direct, 1 indirect
- Injuries
- 0 direct, 1 indirect
- Property damage
- $85,000
- Reported by
- Broadcast Media
- Coordinates
- 42.845, -91.341 (the zone’s center; the record gives no point)
One person was killed and another injured when two semi's collided at the intersection of U.S. Highway 52 and State Highway 13 southeast of Monona. The driver of one semi failed to stop at the intersection and collided with the second semi. Lead-acid batteries were strewn across the roads as a result of the accident. A hazard materials team had to be called in for clean up, resulting in the roads being closed for several hours. The visibility was likely reduced to less than a half mile in dense fog at the time of the accident.
- 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.
- Tornadoes and Hail in Arkansas, March 19, 20201 injured · $485,000 · EF2 · 12 events
- Winter Weather in South Dakota, March 19, 20201 death · 1 event
- Flash Flooding and Flooding in Ohio, March 19 to 22, 2020$1.2 million · 50 kt wind · 38 events
- Tornadoes and Flash Flooding in Illinois, March 19 to 22, 20201 injured · $436,000 · EF1 · 10 events
- Winter Weather in South Dakota, March 19 to 20, 202011 injured · 15 events
- Tornadoes and Flash Flooding in Oklahoma, March 19 to 22, 2020$145,000 · EF1 · 15 events
- Flash Flooding and Flooding in Missouri, March 19 to 20, 2020$32,000 · 50 kt wind · 67 events
- Hail and High Wind in Nebraska, March 19 to 20, 2020$200,000 · 1.25 in hail · 17 events
- High Wind in Texas, March 19, 202051 kt wind · 18 events
- Hail and Damaging Winds in Texas, March 19, 2020$12,000 · 2.75 in hail · 9 events
- Flash Flood and Flood in Indiana, March 19 to 20, 2020$15,000 · 53 kt wind · 4 events
- High Wind in Oklahoma, March 19, 202053 kt wind · 11 events
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 2026-09-30. Each event’s entry at NCEI: 880581.