Alert archive / Iowa / Flash Flood Watches in 2007

Flash Flood Watch 11, NWS Quad Cities, IA

August 19, 200721 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood watch at Aug 19, 2007, 3:38 AM CDT for 21 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Aug 19, 2007, 7:00 AM CDT. It was in force for 6 days.

The area

The counties it named.

The facts

Issued: Aug 19, 2007, 3:38 AM CDT (08:38 UTC)
In effect from: Aug 19, 2007, 7:00 AM CDT
Expired: Aug 25, 2007, 3:48 AM CDT
In force: 6 days
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 08:40 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, 8.6 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: 936 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash 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 flash flood watch went out at Aug 19, 3:15 AM CDT, 23 minutes earlier.

Area forecast discussion, Aug 19, 3:15 AM CDT, 23 minutes before

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Hazardous weather outlook, Aug 18, 4:45 AM CDT, 22 hours 53 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
Aug 19, 3:35 PM CDT	Flash Flood Warning	DVN	Buchanan	115 min
Aug 19, 5:29 PM CDT	Flash Flood Warning	DVN	Buchanan	3 hr
Aug 19, 2:57 PM CDT	River Flood Warning	DVN	Stephenson	17 days
Aug 19, 2:57 PM CDT	River Flood Warning	DVN	Whiteside	21 hr
Aug 19, 2:57 PM CDT	River Flood Warning	DVN	Henry, Rock Island, Whiteside	18 days
Aug 19, 2:57 PM CDT	River Flood Warning	DVN	Henry, Rock Island	16 days

Nearby

Flash Flood Watches in Iowa, 2007 Flash Flood Watches in Illinois, 2007 Flash Flood Watches in Missouri, 2007 Every flash flood watch in 2007

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.