Alert archive / Iowa / Flood Watches in 2009

Flood Watch 2, NWS Quad Cities, IA

December 22, 200921 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flood watch at Dec 22, 2009, 3:47 PM CST for 21 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Dec 23, 2009, 12:00 PM CST. It was in force for 42 hr.

The area

The counties it named.

The facts

Issued: Dec 22, 2009, 3:47 PM CST (21:47 UTC)
In effect from: Dec 23, 2009, 12:00 PM CST
Expired: Dec 25, 2009, 6:00 AM CST
In force: 42 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

All 36 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, 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 21:44 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

Lincoln, IL (KILX), launched 12:00Z, 9.8 hours before the alert went out and 251 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: 968 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 264 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 flood watch 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 flood watch went out at Dec 22, 3:41 PM CST, 6 minutes earlier.

Area forecast discussion, Dec 22, 3:41 PM CST, 6 minutes before

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Hazardous weather outlook, Dec 22, 5:07 AM CST, 10 hours 40 minutes before

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In the hours before

Local storm report, Dec 22, 10:08 AM CST, 5 hours 39 minutes before

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Local storm report, Dec 22, 10:49 AM CST, 4 hours 58 minutes before

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Local storm report, Dec 22, 10:58 AM CST, 4 hours 49 minutes before

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Local storm report, Dec 22, 12:25 PM CST, 3 hours 22 minutes before

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Local storm report, Dec 22, 12:55 PM CST, 2 hours 52 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
Dec 22, 4:07 PM CST	Winter Weather Advisory	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 7 more	36 hr

Nearby

Flood Watches in Iowa, 2009 Flood Watches in Illinois, 2009 Flood Watches in Missouri, 2009 Every flood watch in 2009

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.