Alert archive / Iowa / Winter Storm Watches in 2015

Winter Storm Watch 3, NWS Des Moines, IA

February 24, 201531 counties in Iowa

NWS Des Moines, IA issued this winter storm watch at Feb 24, 2015, 11:34 AM CST for 31 counties in Iowa. It took effect at Feb 25, 2015, 9:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 24, 2015, 11:34 AM CST (17:34 UTC)
In effect from: Feb 25, 2015, 9:00 AM CST
Expired: Feb 24, 2015, 3:19 PM CST
In force
Issued by: NWS Des Moines, IA

All 31 counties

Adair County, IA, Appanoose County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Carroll County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Davis County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hardin County, IA, Jasper County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Story County, IA, Tama County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA

The radar

The Des Moines radar (KDMX), 6 km from the middle of the area, began a volume at 17:31 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

Omaha, NE (KOAX), launched 12:00Z, 5.6 hours before the alert went out and 226 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1465 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 304 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 24, 5:52 AM CST, 5 hours 42 minutes earlier.

Area forecast discussion, Feb 24, 5:52 AM CST, 5 hours 42 minutes before

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Hazardous weather outlook, Feb 24, 3:43 AM CST, 7 hours 51 minutes before

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The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 24, 3:19 PM CST	Winter Storm Warning	DMX	Appanoose, Black Hawk, Boone, Bremer, Butler, Calhoun and 35 more	30 hr
Feb 24, 3:19 PM CST	Winter Weather Advisory	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Bremer and 33 more	30 hr

Nearby

Winter Storm Watches in Iowa, 2015 Every winter storm watch in 2015

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.