Continued strong wind and plummeting temperatures brought wind chills to 30 below to 45 below zero during the overnight and early morning hours.
Every event with a place to put it; 11 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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.
The episode as NWS FSD wrote it up.
Continued strong wind and plummeting temperatures brought wind chills to 30 below to 45 below zero during the overnight and early morning hours.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Feb 12, 5:11 PM CST, 49 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Sioux Falls SD 345 PM CST Wed Feb 12 2020 MNZ071-072-080-081-097-132145- Lincoln-Lyon-Murray-Cottonwood-Pipestone- 345 PM CST Wed Feb 12 2020 This Hazardous Weather Outlook is for portions of southwest Minnesota. .DAY ONE...This Afternoon and Tonight Strong northwest winds and very cold temperatures will continue to bring blizzard like conditions through sunset. The winds will taper off this evening, but patchy blowing snow will continue. Wind chills will quickly plummet to 40 below to 50 below zero by late evening and continue into Thursday morning. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Wind chill values through late Thursday morning will average 35 below to 40 below zero, with wind chill values of 15 below to 25 below zero through the afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. IAZ001>003-012>014-020>022-031-032-MNZ089-090-NEZ013-014-SDZ070- 071-132145- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Nobles-Jackson-Dixon-Dakota-Union- 345 PM CST Wed Feb 12 2020 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, and southeast South Dakota. .DAY ONE...This Afternoon and Tonight Very cold air will continue to pour into the area this evening. A band of light snow will bring temporary reductions to the visibility with around a half an inch of accumulation expected. Wind chill values of 25 below to 40 below are expected. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Thursday morning wind chills of 25 to 40 below zero will quickly improve by late morning to 10 below to 20 below. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. MNZ098-SDZ038>040-050-052>069-132145- Rock-Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-Miner- Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-Minnehaha- Charles Mix-Douglas-Hutchinson-Turner-Lincoln-Bon Homme-Yankton- 345 PM CST Wed Feb 12 2020 This Hazardous Weather Outlook is for portions of southwest Minnesota, central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...This Afternoon and Tonight Wind chill values of 25 to 40 below are expected late this evening into Thursday morning. Patchy blowing snow will also remain possible through the evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Morning wind chills of 25 to 40 below zero will quickly improve from late morning into the afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The national radar mosaic for the moment the first event began.
6 extreme cold/wind chill, 5 cold/wind chill. Local standard time, as filed.
Wind chills dipped as low as 37 below zero 2 miles east-northeast of Doon.
Wind chills dipped as low as 44 below zero 3 miles southeast of Lake Park.
Wind chills dipped as low as 43 below zero 1 mile northeast of Sibley.
Wind chills dipped as low as 39 below zero at Spencer.
Wind chills dipped as low as 34 below zero at Alton.
Wind chills dipped as low as 42 below zero at Sheldon.
Wind chills dipped as low as 31 below zero at Sioux City.
Wind chills dipped as low as 40 below zero at Storm Lake.
Wind chills dipped as low as 34 below zero at Cherokee.
Wind chills dipped as low as 32 below zero at Le Mars.
Wind chills dipped as low as 34 below zero at Ida Grove.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2020Every state in 2020This day in weather historyWarnings in Iowa, February 2020
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: 875247, 875244, 875246, 875249, 875254, 875248, 875253, 875250, 875251, 875252, 875255.