Alert archive / Iowa / Winter Storm Watches in 2017
Winter Storm Watch 3, NWS Des Moines, IA
NWS Des Moines, IA issued this winter storm watch at Feb 21, 2017, 3:42 PM CST for 15 counties in Iowa. It took effect at Feb 23, 2017, 6:00 PM CST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 21, 2017, 3:42 PM CST (21:42 UTC)
- In effect from
- Feb 23, 2017, 6:00 PM CST
- Expired
- Feb 23, 2017, 4:31 AM CST
- In force
- Issued by
- NWS Des Moines, IA
Counties Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Crawford County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 128 km from the middle of the area, began a volume at 21:46 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, 9.7 hours before the alert went out and 234 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
- 1954 m above ground
- 0-6 km bulk shear
- 82 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 110 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 Des Moines, IA wrote its last area forecast discussion before this winter storm watch went out at Feb 21, 11:29 AM CST, 4 hours 13 minutes earlier.
Area forecast discussion, Feb 21, 11:29 AM CST, 4 hours 13 minutes before
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</html>Hazardous weather outlook, Feb 21, 4:04 AM CST, 11 hours 38 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 404 AM CST Tue Feb 21 2017 IAZ004>007-015>017-023>027-033-034-221015- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Sac-Calhoun- 404 AM CST Tue Feb 21 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT Patchy dense fog may develop early this morning and impact the morning commute. Elevated fire threat will exist this afternoon over areas west of I-35 and north of I-80. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Wintry precipitation is possible Thursday night through Friday night with the best chance for moderate to heavy snow accumulations over northern Iowa. In addition, gusty northwest winds are expected to develop on Friday and linger into Friday evening causing areas of blowing snow. Hazardous travel impacts may be possible Thursday night into Friday night. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. IAZ028-035>039-044>050-057>062-070>072-081-082-092-221015- Bremer-Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll- Greene-Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk- Jasper-Poweshiek-Cass-Adair-Madison-Adams-Union-Taylor- 404 AM CST Tue Feb 21 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT Patchy dense fog may develop early this morning and impact the morning commute. Elevated fire threat will exist this afternoon over areas west of I-35 and north of I-80. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Wintry precipitation is possible Thursday night through Friday night with the best chance for moderate to heavy snow accumulations over northern Iowa. In addition, gusty northwest winds are expected to develop on Friday and linger into Friday evening causing areas of blowing snow. Hazardous travel impacts may be possible Thursday night into Friday night. Isolated to scattered non-severe thunderstorms will be possible over central and southeast Iowa Thursday evening. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. IAZ073>075-083>086-093>097-221015- Warren-Marion-Mahaska-Clarke-Lucas-Monroe-Wapello-Ringgold- Decatur-Wayne-Appanoose-Davis- 404 AM CST Tue Feb 21 2017 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL IOWA. .DAY ONE...TODAY AND TONIGHT Patchy dense fog may develop early this morning and impact the morning commute. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Wintry precipitation is possible Thursday night and Friday with the best chance for moderate to heavy snow accumulations over northern Iowa. In addition, gusty northwest winds are expected to develop on Friday. Hazardous travel impacts may be possible Thursday night into Friday night. Isolated to scattered non-severe thunderstorms will be possible over central and southeast Iowa Thursday afternoon through Friday morning. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 11:18 AM CST | River Flood Warning | DMX | Black Hawk | 5 days |
Nearby
Winter Storm Watches in Iowa, 2017Every winter storm watch in 2017
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.