Alert archive / Iowa / Flash Flood Watches in 2009

Flash Flood Watch 2, NWS Quad Cities, IA

March 9, 200914 counties in Iowa; 12 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood watch at Mar 9, 2009, 4:19 AM CDT for 14 counties in Iowa; 12 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Mar 9, 2009, 7:00 PM CDT. It was in force for 17 hr.

The area

The counties it named.

The facts

Issued: Mar 9, 2009, 4:19 AM CDT (09:19 UTC)
In effect from: Mar 9, 2009, 7:00 PM CDT
Expired: Mar 10, 2009, 12:00 PM CDT
In force: 17 hr
Issued by: NWS Quad Cities, IA
Flood severity: None

All 28 counties

Cedar County, IA, Clinton County, IA, Des Moines County, IA, Henry County, IA, Iowa County, IA, Jefferson County, IA, Johnson County, IA, Keokuk County, IA, Lee 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, 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), 53 km from the middle of the area, began a volume at 09:25 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 58 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: 594 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 81 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 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 Mar 9, 3:50 AM CDT, 29 minutes earlier.

Area forecast discussion, Mar 9, 3:50 AM CDT, 29 minutes before

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Hazardous weather outlook, Mar 8, 3:50 PM CDT, 12 hours 29 minutes before

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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
Mar 8, 8:04 PM CDT	River Flood Warning	DVN	Lee, Van Buren	15 hr
Mar 8, 9:32 PM CDT	River Flood Warning	DVN	Des Moines, Louisa	5 days
Mar 8, 9:32 PM CDT	River Flood Warning	DVN	Des Moines	6 days
Mar 8, 9:32 PM CDT	River Flood Warning	DVN	Des Moines, Lee	7 days
Mar 9, 11:44 AM CDT	River Flood Warning	DVN	Des Moines, Louisa	4 days
Mar 9, 11:44 AM CDT	River Flood Warning	DVN	Lee	4 days
Mar 9, 11:44 AM CDT	River Flood Warning	DVN	Jones, Linn	58 hr
Mar 9, 5:41 AM CDT	River Flood Warning	DVN	Hancock	7 days

Nearby

Flash Flood Watches in Iowa, 2009 Flash Flood Watches in Illinois, 2009 Flash Flood Watches in Missouri, 2009 Every flash 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.