Alert archive / Iowa / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Quad Cities, IA

July 10, 2009Henry County, Rock Island County, Whiteside County, Illinois; 6 counties in Iowa

NWS Quad Cities, IA issued this flash flood warning at Jul 10, 2009, 11:46 AM CDT for Henry County, Rock Island County, Whiteside County, Illinois; 6 counties in Iowa. It was in force for 8 hr. 18 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 10, 2009, 11:46 AM CDT (16:46 UTC)
Expired: Jul 10, 2009, 7:45 PM CDT
In force: 8 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

Counties Cedar County, IA, Clinton County, IA, Johnson County, IA, Linn County, IA, Muscatine County, IA, Scott County, IA, Henry County, IL, Rock Island County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 16 km from the middle of the area, began a volume at 16:47 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.

What was reported inside it

Time	Report	Where	Remark
Jul 10, 12:13 PM CDT	FLASH FLOOD	Tipton, IA	WATER HALF WAY ACROSS HIGHWAY 38 JUST SOUTH OF TOWN.
Jul 10, 1:05 PM CDT	FLASH FLOOD	4 Wsw Moline, IL	PORTION OF U.S. HIGHWAY 67 IN MILAN FLOODED WITH ABOUT 1 FT OF WATER OVER THE ROAD.
Jul 10, 1:05 PM CDT	HEAVY RAIN 2.5	4 Wsw Moline, IL	STORM TOTAL.
Jul 10, 1:15 PM CDT	FLASH FLOOD	W Walcott, IA	WATER OVER OLD HIGHWAY 6...POLICE BLOCKING LANES. ALSO WATER IS FLOWING OVER OLD HIGHWAY 6 1 MILE EAST OF TOWN.
Jul 10, 1:15 PM CDT	HEAVY RAIN 2.54	Davenport, IA	AND STILL RAINING AT KWQC.
Jul 10, 1:26 PM CDT	HEAVY RAIN 1.51	Lowden, IA
Jul 10, 2:00 PM CDT	FLASH FLOOD	Walcott, IA	4.00 INCHES OF RAIN BY 2PM. SEVERAL HOUSES WITH FLOODED BASEMENTS. 2 TO 11 INCHES OF WATER IN BASEMENTS. NORTH MAIN WITH WATER OVER THE ROAD AT MUD CREEK. DELAYED REPORT.
Jul 10, 2:00 PM CDT	HEAVY RAIN 1.58	Davenport Municipal Air, IA	OFFICIAL NWS OBSERVATION AT THE NWS OFFICE. 7 HOUR RAINFALL TOTAL...FROM 7 AM TO 2 PM. DELAYED REPORT.
Jul 10, 2:25 PM CDT	HEAVY RAIN 1.43	2 Ne Calamus, IA	RAINFALL SINCE ABOUT 6 AM.
Jul 10, 2:25 PM CDT	HEAVY RAIN 2.57	Davenport, IA	RAINFALL TOTAL AT KWQC.
Jul 10, 2:30 PM CDT	HEAVY RAIN 2.75	Andalusia, IL	RAINFALL TOTAL. RELAYED BY WHBF WEATHER.
Jul 10, 2:30 PM CDT	HEAVY RAIN 3.25	4 Wsw Moline, IL	STORM TOTAL. HIGHWAY 67 IN MILAN IS NOW OPEN AGAIN.
Jul 10, 3:00 PM CDT	HEAVY RAIN 1.75	Davenport Municipal Air, IA	OFFICIAL NWS OBSERVATION. 12 HOUR RAINFALL TOTAL. RAIN HAS ENDED.
Jul 10, 3:00 PM CDT	HEAVY RAIN 2.46	Moline Quad-City Airpor, IL	OFFICIAL NWS OBSERVATION. 12 HOUR RAINFALL TOTAL. RAIN HAS ENDED.
Jul 10, 3:15 PM CDT	FLASH FLOOD	Davenport, IA	DUCK CREEK IN DAVENPORT IS STILL OUT OF IS BANKS NEAR THE HARRISON STREET BRIDGE.
Jul 10, 4:35 PM CDT	HEAVY RAIN 1.52	Park View, IA	RAINFALL TODAY.
Jul 10, 6:20 PM CDT	FLOOD	1 Nw Plainview, IA	MUD CREEK IS FLOWING OVER HIGHWAY 130 JUST NORTHWEST OF PLAINVIEW. THE FLOOD WATERS ARE ABOUT 5 INCHES DEEP.
Jul 10, 7:21 PM CDT	HEAVY RAIN 3.46	Walcott, IA	RAINFALL TOTAL TODAY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 4.8 hours before the alert went out and 23 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: 831 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 977 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KDVN 101646
FFWDVN
IAC031-045-103-113-139-163-ILC073-161-195-110045-
/O.NEW.KDVN.FF.W.0021.090710T1646Z-090711T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1146 AM CDT FRI JUL 10 2009

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CEDAR COUNTY IN EAST CENTRAL IOWA...
  THIS INCLUDES THE CITY OF TIPTON...
  SOUTHERN CLINTON COUNTY IN EAST CENTRAL IOWA...
  EASTERN JOHNSON COUNTY IN EAST CENTRAL IOWA...
  SOUTHEASTERN LINN COUNTY IN EAST CENTRAL IOWA...
  MUSCATINE COUNTY IN EAST CENTRAL IOWA...
  THIS INCLUDES THE CITY OF MUSCATINE...
  SCOTT COUNTY IN EAST CENTRAL IOWA...
  THIS INCLUDES THE CITIES OF...DAVENPORT...BETTENDORF...
  NORTHWESTERN HENRY COUNTY IN NORTHWEST ILLINOIS...
  ROCK ISLAND COUNTY IN NORTHWEST ILLINOIS...
  THIS INCLUDES THE CITIES OF...ROCK ISLAND...MOLINE...EAST MOLINE...
  SOUTHWESTERN WHITESIDE COUNTY IN NORTHWEST ILLINOIS...

* UNTIL 745 PM CDT FRIDAY

* AT 1139 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  WHEATLAND...STANWOOD...PRINCETON...MOUNT VERNON...MECHANICSVILLE...
  MCCAUSLAND...LOWDEN...LOW MOOR...LONG GROVE...LISBON...GRAND
  MOUND...ELDRIDGE...DONAHUE...DEWITT...CLARENCE...CAMANCHE...
  CALAMUS...BENNETT...ERIE...CORDOVA AND ALBANY

RAINFALL ESTIMATED BETWEEN 1 AND 2 INCHES HAS FALLEN OVER MUCH OF 
THE AREA CENTERED ON INTERSTATE 80 BETWEEN IOWA CITY AND GENESEO.
MORE THUNDERSTORMS WITH HEAVY RAIN WILL MOVE THROUGH THIS AREA BY 
EARLY THIS AFTERNOON.

THE HEAVY RAINS EARLIER THIS MORNING HAD ALREADY PRODUCED SOME MINOR 
STREET FLOODING IN DAVENPORT.  ANY ADDITIONAL HEAVY RAINS WILL 
LIKELY RESULT IN FLASH FLOODING OF STREAMS AND SMALL RIVER...AS WELL 
AS ADDITIONAL STREET FLOODING IN URBAN AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL OF 1 TO 2 IS POSSIBLE.

FLOODING OF SMALL STREAMS AND CREEKS...STREETS...UNDERPASSES AND LOW
LYING URBAN AREAS IS LIKELY.

&&

LAT...LON 4134 9007 4143 9148 4144 9150 4193 9144
      4178 8998

$$

DLF

3 follow-up statements

000 
WGUS73 KDVN 101826
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
126 PM CDT FRI JUL 10 2009

IAC031-045-103-113-139-163-ILC073-161-195-110045-
/O.CON.KDVN.FF.W.0021.000000T0000Z-090711T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINN IA-CLINTON IA-CEDAR IA-JOHNSON IA-SCOTT IA-MUSCATINE IA-
WHITESIDE IL-ROCK ISLAND IL-HENRY IL-
126 PM CDT FRI JUL 10 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHWESTERN HENRY...ROCK ISLAND...SOUTHWESTERN WHITESIDE...
MUSCATINE...SCOTT...EASTERN JOHNSON...CEDAR...SOUTHERN CLINTON AND
SOUTHEASTERN LINN COUNTIES...

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
WILTON...WHEATLAND...WALCOTT...TIPTON...STANWOOD...PRINCETON...MOUNT 
VERNON...MECHANICSVILLE...MCCAUSLAND...LOWDEN...LOW MOOR...LONG 
GROVE...LISBON...LE CLAIRE...GRAND 
MOUND...ELDRIDGE...DURANT...DONAHUE...DEWITT...CLARENCE...CAMANCHE...
CALAMUS...BENNETT...PORT BYRON...ERIE...CORDOVA AND ALBANY

AT 112 PM CDT...THE HEAVIEST RAINS WERE OCCURRING OVER THE EASTERN 
HALF OF ROCK ISLAND COUNTY WITH MODERATE RAINS EXTENDING TO THE 
NORTH AND EAST OVER MOST OF SCOTT...WHITESIDE AND HENRY COUNTY AS 
WELL AS SOUTHERN CLINTON COUNTY.  

THE HEAVY RAINS HAVE ALREADY RESULTED IN SOME FLOODING IN CEDAR 
COUNTY WHERE WATER WAS REPORTED OVER HIGHWAY 38 NEAR TIPTON.  A 
REPORT OF 2.5 INCHES OF RAIN AND WATER AROUND A FOOT DEEP ON HIGHWAY 
67 NEAR MILAN IN ROCK ISLAND COUNTY WAS RECEIVED AROUND 1 PM.  

IN ADDITION TO THE HEAVY RAIN AND FLOODING REPORTS...STREAM GAGES 
ALONG DUCK CREEK BASIN DAVENPORT AND WESTERN SCOTT COUNTY WERE 
SHOWING SIGNIFICANT RISES.  GAGE READINGS INDICATED THAT DUCK CREEK 
AT FAIRMONT AVENUE WAS WITHIN A HALF FOOT OF ITS FLOOD STAGE OF 12 
FEET AROUND 1 PM.  

AS OF 120 PM DOPPLER RADAR WAS SHOWING THAT RAINS WERE MOVING EAST 
AND SLOWLY DECREASING IN INTENSITY.  IF THIS TREND CONTINUES...THE 
HEAVY RAINS SHOULD MOVE EAST OF THE AREA BY 2 OR 3 PM.  
HOWEVER...RUNOFF FROM THE RAINFALL WILL CONTINUE TO CAUSE SOME 
FLOODING WELL INTO THE AFTERNOON.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING OF SMALL STREAMS AND CREEKS...STREETS...UNDERPASSES AND LOW 
LYING URBAN AREAS IS LIKELY.

&&

LAT...LON 4134 9007 4143 9148 4144 9150 4193 9144
      4178 8998

$$

DLF

000 
WGUS73 KDVN 102027
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
327 PM CDT FRI JUL 10 2009

IAC031-045-103-113-139-ILC073-161-195-102020-
/O.CAN.KDVN.FF.W.0021.000000T0000Z-090711T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LINN IA-CLINTON IA-CEDAR IA-JOHNSON IA-MUSCATINE IA-WHITESIDE IL-
ROCK ISLAND IL-HENRY IL-
327 PM CDT FRI JUL 10 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHWESTERN
HENRY...ROCK ISLAND...SOUTHWESTERN WHITESIDE...MUSCATINE...EASTERN
JOHNSON...CEDAR...SOUTHERN CLINTON AND SOUTHEASTERN LINN COUNTIES...

THE RAIN HAS ENDED OVER THE AREA.  REPORTS INDICATE THAT THE 
FLOODING THAT WAS OCCURRING EARLIER...HAS ENDED.

LAT...LON 4152 9049 4152 9050 4153 9051 4153 9055
      4152 9057 4151 9073 4166 9075 4161 9037

$$

IAC163-110045-
/O.CON.KDVN.FF.W.0021.000000T0000Z-090711T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SCOTT IA-
327 PM CDT FRI JUL 10 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
CENTRAL SCOTT COUNTY...

AT 309 PM CDT...RUNOFF FROM THE HEAVY RAINS EARLIER TODAY WAS STILL 
CAUSING SOME MINOR FLOODING ALONG DUCK CREEK IN WESTERN SCOTT COUNTY 
AND ALSO IN THE CITY OF DAVENPORT.  STREAM GAGES ALONG DUCK CREEK 
CONTINUED TO SHOW THE CREEK WAS JUST OVER FLOOD STAGE AT 110TH 
AVENUE AND AT FAIRMONT AVENUE. SIGNIFICANT WITHIN BANK RISES WERE 
ALSO INDICATED FURTHER DOWN STREAM.  

THERE WERE ALSO SIGNIFICANT RISES ON CROW CREEK AT UTICA RIDGE IN 
BETTENDORF...HOWEVER THERE HAS NOT BEEN ANY REPORTS OF FLOODING IN 
THIS AREA AS OF 3 PM. 

&&

LAT...LON 4152 9049 4152 9050 4153 9051 4153 9055
      4152 9057 4151 9073 4166 9075 4161 9037

$$

DLF

000 
WGUS73 KDVN 110052
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
752 PM CDT FRI JUL 10 2009

IAC163-110100-
/O.EXP.KDVN.FF.W.0021.000000T0000Z-090711T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SCOTT IA-
752 PM CDT FRI JUL 10 2009

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL SCOTT COUNTY...

FLOOD WATERS IN SCOTT COUNTY ARE GRADUALLY RECEDING THOUGH STILL 
REMAIN HIGH IN A FEW SPOTS.  DUCK CREEK IS OVERBANK IN DAVENPORT... 
AND 4-5 INCHES OF WATER IS FLOWING OVER A STRETCH OF HIGHWAY 130 
JUST NORTHWEST OF PLAINVIEW.  BUT THE TREND OF THE FLOODING IS 
DOWNWARD AND CONDITIONS SHOULD CONTINUE TO SLOWLY IMPROVE.

IF YOU ARE DRIVING THE STRETCH OF HIGHWAY 130 THAT IS FLOODED... 
EXERCISE CAUTION...ESPECIALLY AFTER SUNSET WHEN THE ROAD MAY BE 
DIFFICULT TO SEE.

LAT...LON 4152 9049 4152 9050 4153 9051 4153 9055
      4152 9057 4151 9073 4166 9075 4161 9037

$$

WOLF

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 10:57 AM CDT	Special Weather Statement	DVN	Henry, Rock Island, Whiteside	48 min
Jul 10, 3:49 AM CDT	Special Weather Statement	DVN	Buchanan, Delaware	56 min
Jul 10, 4:05 AM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Linn	55 min
Jul 10, 5:00 AM CDT	Severe Thunderstorm Warning	DVN	Cedar, Delaware, Dubuque, Jackson, Jones, Linn	60 min
Jul 10, 6:31 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Dubuque, Jones, Linn	74 min
Jul 10, 8:51 AM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware, Jones, Linn	54 min
Jul 10, 9:57 AM CDT	Special Weather Statement	DVN	Benton, Jones, Linn	63 min
Jul 10, 10:24 AM CDT	Special Weather Statement	DVN	Benton, Iowa, Johnson, Keokuk, Linn, Washington	66 min
Jul 10, 11:52 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn	53 min

Nearby

Flash Flood Warnings in Iowa, 2009 Flash Flood Warnings in Illinois, 2009 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.