Alert archive / Iowa / Winter Storm Warnings in 2021
Winter Storm Warning 1, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this winter storm warning at Feb 21, 2021, 11:24 AM CST for Ida County, Woodbury County, Iowa; Dakota County, Nebraska. It was in force for 4 hr. 6 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Feb 21, 2021, 11:24 AM CST (17:24 UTC)
- Expired
- Feb 21, 2021, 3:50 PM CST
- In force
- 4 hr
- Issued by
- NWS Sioux Falls, SD
Counties Ida County, IA, Woodbury County, IA, Dakota County, NE
The radar
The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 17:25 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 21, 12:15 PM CST | HEAVY SNOW 6 | 1 Wsw Ida Grove, IA | CORRECTS PREVIOUS SNOW REPORT FROM 1 WSW IDA GROVE. STILL SNOWING. |
| Feb 21, 12:20 PM CST | HEAVY SNOW 7 | Battle Creek, IA | CORRECTS PREVIOUS SNOW REPORT FROM BATTLE CREEK. STILL SNOWING. |
| Feb 21, 2:20 PM CST | SNOW 4.5 | 3 Nne Sioux City, IA | CORRECTED FOR STORM TOTAL SNOWFALL. |
| Feb 21, 2:50 PM CST | SNOW 6.5 | South Sioux City, NE | STORM TOTAL SNOWFALL. REPORTED VIA SOCIAL MEDIA. |
| Feb 21, 2:50 PM CST | HEAVY SNOW 8 | Battle Creek, IA | STORM TOTAL SNOWFALL. |
| Feb 21, 3:00 PM CST | HEAVY SNOW 8 | 1 Wsw Ida Grove, IA | CORRECTED TO REFLECT STORM TOTAL SNOWFALL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 5.4 hours before the alert went out and 122 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 590 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
112 WWUS43 KFSD 211724 WSWFSD URGENT - WINTER WEATHER MESSAGE National Weather Service Sioux Falls SD 1124 AM CST Sun Feb 21 2021 IAZ031-032-NEZ014-220000- /O.UPG.KFSD.WW.Y.0008.000000T0000Z-210222T0000Z/ /O.NEW.KFSD.WS.W.0001.210221T1724Z-210222T0000Z/ Woodbury-Ida-Dakota- 1124 AM CST Sun Feb 21 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 6 PM CST THIS EVENING... * WHAT...Heavy snow. Additional snow accumulations of up to two inches. Storm total snow accumulations of 5 to 7 inches. * WHERE...In Nebraska, Dakota County. In Iowa, Woodbury and Ida Counties. * WHEN...Until 6 PM CST this evening. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IAZ002-003-012>014-020>022-MNZ090-NEZ013-SDZ071-220000- /O.CON.KFSD.WW.Y.0008.000000T0000Z-210222T0000Z/ Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Jackson-Dixon-Union- 1124 AM CST Sun Feb 21 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST THIS EVENING... * WHAT...Snow. Additional snow accumulations of up to one inch. * WHERE...Portions of southeast South Dakota, northeast Nebraska, northwest Iowa and southwest Minnesota. * WHEN...Until 6 PM CST this evening. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ For more information from the National Weather Service visit https://weather.gov/siouxfalls
1 follow-up statement
010 WWUS43 KFSD 212150 WSWFSD URGENT - WINTER WEATHER MESSAGE National Weather Service Sioux Falls SD 350 PM CST Sun Feb 21 2021 IAZ031-032-NEZ014-212300- /O.CAN.KFSD.WS.W.0001.000000T0000Z-210222T0000Z/ Woodbury-Ida-Dakota- 350 PM CST Sun Feb 21 2021 ...WINTER STORM WARNING IS CANCELLED... Heavy snow has exited the region. Light snow will continue to taper off through this evening. Little to no additional accumulation expected. $$ IAZ002-003-012>014-020>022-MNZ090-NEZ013-SDZ071-212300- /O.CAN.KFSD.WW.Y.0008.000000T0000Z-210222T0000Z/ Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Jackson-Dixon-Union- 350 PM CST Sun Feb 21 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Heavy snow has exited the region. Light snow will continue to taper off through this evening. Little to no additional accumulation expected. $$ For more information from the National Weather Service visit https://weather.gov/siouxfalls
Nearby
Winter Storm Warnings in Iowa, 2021Winter Storm Warnings in Nebraska, 2021Every winter storm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.