Alert archive / Iowa / Winter Storm Warnings in 2020

Winter Storm Warning 1, NWS Quad Cities, IA

January 10, 202021 counties in Iowa; 9 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this winter storm warning at Jan 10, 2020, 3:17 AM CST for 21 counties in Iowa; 9 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Jan 10, 2020, 3:00 PM CST. It was in force for 32 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: Jan 10, 2020, 3:17 AM CST (09:17 UTC)
In effect from: Jan 10, 2020, 3:00 PM CST
Expired: Jan 11, 2020, 10:42 PM CST
In force: 32 hr
Issued by: NWS Quad Cities, IA

All 32 counties

Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware 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, Carroll County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Mercer County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Clark County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 49 km from the middle of the area, began a volume at 09:15 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 00:00Z, 9.3 hours before the alert went out and 55 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: 9 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 319 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 Jan 10, 2:45 AM CST, 32 minutes earlier.

Area forecast discussion, Jan 10, 2:45 AM CST, 32 minutes before

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Hazardous weather outlook, Jan 9, 3:51 PM CST, 11 hours 26 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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
Jan 10, 3:17 AM CST	Winter Weather Advisory	DVN	Bureau, McDonough, Putnam, Warren	45 hr

Nearby

Winter Storm Warnings in Iowa, 2020 Winter Storm Warnings in Illinois, 2020 Winter Storm Warnings in Missouri, 2020 Every winter storm warning in 2020

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.