Alert archive / Iowa / Flash Flood Watches in 2007

Flash Flood Watch 5, NWS Quad Cities, IA

June 22, 200721 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri

NWS Quad Cities, IA issued this flash flood watch at Jun 22, 2007, 3:16 PM CDT for 21 counties in Iowa; 13 counties in Illinois; Clark County, Scotland County, Missouri. It took effect at Jun 22, 2007, 7:00 PM CDT. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Jun 22, 2007, 3:16 PM CDT (20:16 UTC)
In effect from: Jun 22, 2007, 7:00 PM CDT
Expired: Jun 23, 2007, 3:07 PM CDT
In force: 20 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 20:17 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, 8.3 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: 529 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Jun 22, 11:20 AM CDT, 3 hours 56 minutes earlier.

Area forecast discussion, Jun 22, 11:20 AM CDT, 3 hours 56 minutes before

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Hazardous weather outlook, Jun 22, 5:32 AM CDT, 9 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
532 AM CDT FRI JUN 22 2007

IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-231045-
BUCHANAN-DELAWARE-DUBUQUE-BENTON-LINN-JONES-JACKSON-IOWA-JOHNSON-
CEDAR-CLINTON-MUSCATINE-SCOTT-KEOKUK-WASHINGTON-LOUISA-JEFFERSON-
HENRY IA-DES MOINES-VAN BUREN-LEE-JO DAVIESS-STEPHENSON-CARROLL-
WHITESIDE-ROCK ISLAND-HENRY IL-BUREAU-PUTNAM-MERCER-HENDERSON-
WARREN-HANCOCK-MCDONOUGH-SCOTLAND-CLARK-
532 AM CDT FRI JUN 22 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
ILLINOIS...NORTHWEST ILLINOIS...WEST CENTRAL ILLINOIS...EAST
CENTRAL IOWA...NORTHEAST IOWA...SOUTHEAST IOWA AND NORTHEAST
MISSOURI.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE ENTIRE
OUTLOOK AREA TODAY AND TONIGHT.

SHOWERS AND THUNDERSTORMS WILL BE WIDESPREAD THIS MORNING MAINLY
OVER PORTIONS OF EAST CENTRAL AND SOUTHEAST IOWA...NORTHEAST
MISSOURI AND WEST CENTRAL ILLINOIS. THE THUNDERSTORMS WILL BRING
TORRENTIAL DOWNPOURS WHILE MOVING OVER SOME OF THE SAME AREAS
REPEATEDLY...THEREBY ENHANCING THE POTENTIAL FOR FLASH FLOODING.
A FLASH FLOOD WATCH IS IN EFFECT UNTIL NOON FOR PORTIONS OF
IOWA AND WEST CENTRAL ILLINOIS ROUGHLY ALONG AND SOUTH OF A LINE
FROM CEDAR RAPIDS...TO MUSCATINE...TO ALEDO. ALONG WITH THE
POTENTIAL FOR FLASH FLOODING...THE STORMS WILL BRING FREQUENT AND
DANGEROUS LIGHTNING AND POSSIBLY STRONG WIND GUSTS BETWEEN 30 AND
50 MPH.

ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER PORTIONS
OF WESTERN AND CENTRAL IOWA THIS AFTERNOON...AND MOVE BACK ACROSS
THE OUTLOOK AREA MID TO LATE AFTERNOON AND TONIGHT. IF ENOUGH
CLEARING AND SUBSEQUENT DESTABILIZATION CAN OCCUR AHEAD OF THESE
STORMS THEN A FEW WILL HAVE THE POTENTIAL TO BECOME SEVERE WITH
THE MAIN THREATS BEING LARGE HAIL TO UP TO NICKEL SIZE AND DAMAGING
STRAIGHT LINE WINDS AROUND 60 MPH. THE STORMS WILL ALSO BE CAPABLE
OF PRODUCING FREQUENT AND DANGEROUS LIGHTNING...AND LOCALLY HEAVY
RAINFALL LEADING TO POSSIBILITY OF FLASH FLOODING AND RIVER FLOODING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THUNDERSTORMS WILL BE POSSIBLE ON SATURDAY. THE STORM PREDICTION
CENTER HAS PORTIONS OF SOUTHEAST IOWA...WEST CENTRAL ILLINOIS
AND NORTHEAST MISSOURI OUTLOOKED IN A SLIGHT RISK OF SEVERE
WEATHER.

MORE THUNDERSTORMS WILL BE POSSIBLE TUESDAY AND WEDNESDAY...BUT IT
IS TOO EARLY TO ASSESS THE POTENTIAL FOR SEVERE WEATHER.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. ANY
REPORTS OF DAMAGING WINDS...LARGE HAIL OR HEAVY RAINFALL IN EXCESS
OF 1 INCH AND ASSOCIATED FLOODING TO THE NATIONAL WEATHER SERVICE
IN THE QUAD CITIES WILL BE GREATLY APPRECIATED.

In the hours before

Local storm report, Jun 22, 12:26 PM CDT, 2 hours 50 minutes before

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Local storm report, Jun 22, 12:56 PM CDT, 2 hours 20 minutes before

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Local storm report, Jun 22, 1:11 PM CDT, 2 hours 5 minutes before

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Local storm report, Jun 22, 2:35 PM CDT, 41 minutes before

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Local storm report, Jun 22, 2:42 PM CDT, 34 minutes before

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Local storm report, Jun 22, 3:15 PM CDT, 1 minute 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
Jun 21, 7:23 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson	67 min
Jun 21, 7:38 PM CDT	Severe Thunderstorm Warning	DVN	Johnson, Louisa, Muscatine, Washington	52 min
Jun 21, 8:07 PM CDT	Severe Thunderstorm Warning	DVN	Scott	38 min
Jun 21, 8:22 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines	23 min
Jun 22, 12:45 AM CDT	Severe Thunderstorm Warning	DVN	Des Moines	60 min
Jun 22, 1:18 AM CDT	Severe Thunderstorm Warning	DVN	Johnson, Louisa, Muscatine	27 min
Jun 22, 4:39 AM CDT	Flash Flood Watch	DVN	Benton, Cedar, Des Moines, Henry, Iowa, Jefferson and 8 more	7 hr
Jun 22, 5:27 AM CDT	Flash Flood Warning	DVN	Johnson	6 hr
Jun 22, 6:52 AM CDT	Flash Flood Warning	DVN	Des Moines, Louisa	6 hr
Jun 22, 7:50 AM CDT	Flash Flood Warning	DVN	Iowa, Linn	6 hr
Jun 22, 7:57 AM CDT	Flash Flood Warning	DVN	Muscatine	6 hr
Jun 22, 4:41 PM CDT	Flash Flood Warning	DVN	Benton, Iowa	9 hr
Jun 22, 6:24 PM CDT	Flash Flood Warning	DVN	Johnson	8 hr
Jun 22, 6:57 PM CDT	Flash Flood Warning	DVN	Des Moines	9 hr
Jun 22, 6:57 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Lee	63 min
Jun 21, 7:56 PM CDT	Severe Thunderstorm Warning	DVN	McDonough	34 min
Jun 21, 8:30 PM CDT	Severe Thunderstorm Warning	DVN	McDonough	45 min
Jun 21, 8:41 PM CDT	Severe Thunderstorm Warning	DVN	Warren	35 min
Jun 21, 9:10 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	35 min
Jun 22, 4:02 AM CDT	Flash Flood Warning	DVN	McDonough	6 hr
Jun 22, 5:56 AM CDT	Flash Flood Warning	DVN	Hancock	6 hr
Jun 22, 9:13 AM CDT	Flash Flood Warning	DVN	McDonough	4 hr

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.