Alert archive / Iowa / Winter Storm Warnings in 2010

Winter Storm Warning 3, NWS Quad Cities, IA

February 20, 201019 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this winter storm warning at Feb 20, 2010, 3:51 PM CST for 19 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Feb 21, 2010, 6:00 AM CST. It was in force for 21 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 20, 2010, 3:51 PM CST (21:51 UTC)
In effect from: Feb 21, 2010, 6:00 AM CST
Expired: Feb 22, 2010, 3:29 AM CST
In force: 21 hr
Issued by: NWS Quad Cities, IA

All 34 counties

Benton County, IA, Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Bureau County, IL, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 41 km from the middle of the area, began a volume at 21:53 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

Davenport, (KDVN), launched 12:00Z, 9.9 hours before the alert went out and 47 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: 515 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 194 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this winter storm warning went out at Feb 20, 3:45 PM CST, 6 minutes earlier.

Area forecast discussion, Feb 20, 3:45 PM CST, 6 minutes before

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Hazardous weather outlook, Feb 20, 5:00 AM CST, 10 hours 51 minutes before

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In the hours before

Local storm report, Feb 20, 10:06 AM CST, 5 hours 45 minutes before

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Local storm report, Feb 20, 10:14 AM CST, 5 hours 37 minutes before

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Local storm report, Feb 20, 10:37 AM CST, 5 hours 14 minutes before

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Special weather statement, Feb 20, 10:45 AM CST, 5 hours 6 minutes before

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Local storm report, Feb 20, 11:22 AM CST, 4 hours 29 minutes before

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Local storm report, Feb 20, 3:44 PM CST, 7 minutes before

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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 20, 4:25 AM CST	Winter Storm Watch	DVN	Benton, Cedar, Clinton, Des Moines, Dubuque, Henry and 13 more	11 hr
Feb 20, 3:51 PM CST	Winter Weather Advisory	DVN	Benton, Buchanan, Delaware, Dubuque, Iowa, Jones and 1 more	24 hr

Nearby

Winter Storm Warnings in Iowa, 2010 Winter Storm Warnings in Illinois, 2010 Winter Storm Warnings in Missouri, 2010 Every winter storm warning in 2010

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.