Alert archive / Iowa / Winter Storm Watches in 2018
Winter Storm Watch 3, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this winter storm watch at Feb 22, 2018, 3:56 PM CST for 8 counties in South Dakota; 11 counties in Iowa; 8 counties in Minnesota. It took effect at Feb 24, 2018, 6:00 AM CST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 22, 2018, 3:56 PM CST (21:56 UTC)
- In effect from
- Feb 24, 2018, 6:00 AM CST
- Expired
- Feb 23, 2018, 3:00 PM CST
- In force
- Issued by
- NWS Sioux Falls, SD
All 27 counties
Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Ida County, IA, Lyon County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Sioux County, IA, Woodbury County, IA, Cottonwood County, MN, Jackson County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Bon Homme County, SD, Clay County, SD, Lincoln County, SD, Minnehaha County, SD, Moody County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 56 km from the middle of the area, began a volume at 21:58 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.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 9.9 hours before the alert went out and 262 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
- 1937 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm watch went out, 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 this winter storm watch went out at Feb 22, 3:25 PM CST, 31 minutes earlier.
Area forecast discussion, Feb 22, 3:25 PM CST, 31 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Feb 22, 4:38 AM CST, 11 hours 18 minutes before
Hazardous Weather Outlook National Weather Service Sioux Falls SD 438 AM CST Thu Feb 22 2018 IAZ002-003-012>014-020>022-031-032-MNZ090-NEZ013-014-SDZ070-071- 231045- Osceola-Dickinson-Sioux-O'Brien-Clay IA-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Jackson-Dixon-Dakota-Clay SD-Union- 438 AM CST Thu Feb 22 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, and southeast South Dakota. .DAY ONE...Today and Tonight A wintry mix of freezing drizzle, freezing rain and snow will be found across the area today and tonight. There may even be a bit of sleet late this afternoon and early evening. Most of the accumulating snow is expected Thursday evening. Before hand on Thursday, light freezing precipitation will periodically accompany areas of light snow. Total ice accumulations are expected to remain below a tenth of an inch. Snow accumulations will average generally one and a half to two and a half inches. A winter weather advisory is in effect. .DAYS TWO THROUGH SEVEN...Friday through Wednesday There is another chance for snow on Saturday. Details with the storm track could certainly change, but at this time, moderate snow accumulations are possible. This forecast will be updated in the future to pin down snow amounts. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. IAZ001-MNZ080-081-089-098-SDZ062-066-067-231045- Lyon IA-Murray-Cottonwood-Nobles-Rock-Minnehaha-Turner-Lincoln SD- 438 AM CST Thu Feb 22 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, southwest Minnesota, and southeast South Dakota. .DAY ONE...Today and Tonight Snow is expected to occur today and tonight. Areas of light snow today may be accompanied by light freezing drizzle. Accumulating snow will occur from west to east from mid afternoon through the evening hours. Total ice accumulations will be minor, generally a few hundredths of an inch or less. Snow accumulations are expected to be near 2 to around 3 inches. A winter weather advisory is in effect. .DAYS TWO THROUGH SEVEN...Friday through Wednesday There is another chance for snow on Saturday. Details with the storm track could certainly change, but at this time, moderate snow accumulations are possible. This forecast will be updated in the future to pin down snow amounts. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. MNZ071-072-097-SDZ038>040-050-052>061-063>065-068-069-231045- Lincoln MN-Lyon MN-Pipestone-Beadle-Kingsbury-Brookings-Gregory- Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson- McCook-Charles Mix-Douglas-Hutchinson-Bon Homme-Yankton- 438 AM CST Thu Feb 22 2018 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...Today and Tonight Snow will occur today and this evening. Most of the snow accumulation will occur this afternoon and evening. Three to four inches of snow is expected. However closer to the Nebraska border, snow amounts may stay closer to two inches but combined with a threat for some light freezing drizzle today. A winter weather advisory is in effect. .DAYS TWO THROUGH SEVEN...Friday through Wednesday There is another chance for snow on Saturday. Details with the storm track could certainly change, but at this time, moderate snow accumulations are possible, especially from southeast South Dakota to southwest Minnesota. East central South Dakota may see lighter amounts. This forecast will be updated in the future to pin down snow amounts. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
Nearby
Winter Storm Watches in Iowa, 2018Winter Storm Watches in South Dakota, 2018Winter Storm Watches in Minnesota, 2018Every winter storm watch in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.