Alert archive / Illinois / Flash Flood Warnings in 2012

Flash Flood Warning 3, NWS Quad Cities, IA

May 3, 2012Louisa County, Scott County, Iowa; Henry County, Mercer County, Rock Island County, Illinois

NWS Quad Cities, IA issued this flash flood warning at May 3, 2012, 10:44 PM CDT for Louisa County, Scott County, Iowa; Henry County, Mercer County, Rock Island County, Illinois. It was in force for 6 hr. 1 report 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
May 3, 2012, 10:44 PM CDT (03:44 UTC)
Expired
May 4, 2012, 4:45 AM CDT
In force
6 hr
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

Counties Louisa County, IA, Scott County, IA, Henry County, IL, Mercer County, IL, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 17 km from the middle of the area, began a volume at 03:45 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

TimeReportWhereRemark
May 3, 11:45 PM CDTHEAVY RAIN 1.62 Se Colona, ILRAINFALL BETWEEN 910 PM AND 1145PM.

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 00:00Z, 3.7 hours before the alert went out and 19 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2012-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1056 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2012-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1056 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1420 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
100 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

764 
WGUS53 KDVN 040344
FFWDVN
IAC115-163-ILC073-131-161-040945-
/O.NEW.KDVN.FF.W.0003.120504T0344Z-120504T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1044 PM CDT THU MAY 3 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SCOTT COUNTY IN EAST CENTRAL IOWA...
  THIS INCLUDES THE CITIES OF...DAVENPORT...BETTENDORF...
  HENRY COUNTY IN NORTHWEST ILLINOIS...
  THIS INCLUDES THE CITIES OF...KEWANEE...CAMBRIDGE...
  MERCER COUNTY IN NORTHWEST ILLINOIS...
  THIS INCLUDES THE CITY OF ALEDO...
  ROCK ISLAND COUNTY IN NORTHWEST ILLINOIS...
  THIS INCLUDES THE CITIES OF...ROCK ISLAND...MOLINE...EAST MOLINE...
  SOUTHEASTERN LOUISA COUNTY IN SOUTHEAST IOWA...

* UNTIL 445 AM CDT FRIDAY

* AT 1037 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED 
  AREA.  RAINFALL RATES OF 1 TO 2 INCHES PER HOUR CAN BE EXPECTED.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ATKINSON...
  OSBORN...HOOPPOLE...GENESEO...COLONA...CLEVELAND...SILVIS...RAPIDS
  CITY...PORT BYRON...MILAN...HAMPTON...CORDOVA...COAL VALLEY...
  ANDALUSIA...WALCOTT...RIVERDALE...PRINCETON...LONG GROVE...LE
  CLAIRE...ELDRIDGE...DONAHUE...BUFFALO AND BLUE GRASS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL OF 1 TO 2 INCHES IS EXPECTED.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING...ESPECIALLY WHILE DRIVING.

&&

LAT...LON 4114 8987 4115 9043 4107 9044 4108 9117
      4133 9109 4133 9080 4159 9078 4160 9090
      4176 9090 4175 9072 4173 9071 4174 9070
      4172 9038 4159 9019 4158 8986

$$

LE
2 follow-up statements
061 
WGUS73 KDVN 040645
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
145 AM CDT FRI MAY 4 2012

IAC115-163-ILC073-131-161-040945-
/O.CON.KDVN.FF.W.0003.000000T0000Z-120504T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SCOTT IA-LOUISA IA-HENRY IL-MERCER IL-ROCK ISLAND IL-
145 AM CDT FRI MAY 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM CDT FOR ROCK
ISLAND...MERCER...HENRY...SOUTHEASTERN LOUISA AND SCOTT COUNTIES...

AT 136 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE AREAS WHERE THE EVENING AND OVERNIGHT THUNDERSTORMS HAVE 
PRODUCED VERY HEAVY RAINFALL OVER THE WARNED AREA.  RAINFALL RATES 
OF 1 TO 2 INCHES PER HOUR HAVE RESULTED IN RAINFALL TOTALS EXCEEDING 
2 INCHES OVER MUCH OF MERCER...SOUTHERN ROCK ISLAND AND HENRY 
COUNTIES.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO  
HOOPPOLE...COLONA...CLEVELAND...SILVIS...ROCK ISLAND...RAPIDS 
CITY...PORT BYRON...MOLINE...HAMPTON...EAST MOLINE...CORDOVA... 
WALCOTT...RIVERDALE...PRINCETON...LONG GROVE...LE CLAIRE... 
ELDRIDGE...DONAHUE...DAVENPORT...BLUE GRASS AND BETTENDORF.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING...ESPECIALLY WHILE DRIVING.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY
MORNING FOR WEST CENTRAL ILLINOIS. A SEVERE THUNDERSTORM WATCH ALSO
REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY MORNING FOR SOUTHEAST IOWA
AND NORTHEAST MISSOURI.

&&

LAT...LON 4114 8987 4115 9043 4107 9044 4108 9117
      4133 9109 4133 9080 4159 9078 4160 9090
      4176 9090 4175 9072 4173 9071 4174 9070
      4172 9038 4159 9019 4158 8986

$$

LE
190 
WGUS73 KDVN 040952
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
452 AM CDT FRI MAY 4 2012

IAC115-163-ILC073-131-161-040957-
/O.EXP.KDVN.FF.W.0003.000000T0000Z-120504T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SCOTT IA-LOUISA IA-HENRY IL-MERCER IL-ROCK ISLAND IL-
452 AM CDT FRI MAY 4 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR ROCK ISLAND...MERCER...
HENRY...SOUTHEASTERN LOUISA AND SCOTT COUNTIES...

STORMS PRODUCING HEAVY RAINFALL HAVE MOVED OUT OF MOST OF THE 
PREVIOUSLY WARNED AREA...AND LITTLE OR NO LINGERING FLOODING HAS 
BEEN REPORTED RECENTLY. HOWEVER...A SMALL SOUTHWESTERN PORTION OF 
THE PREVIOUS FLASH FLOOD WARNING WAS REPLACED BY AN AREAL FLOOD 
WARNING. SEE LATER STATEMENTS AND WARNINGS FOR MORE INFORMATION.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY
MORNING FOR WEST CENTRAL ILLINOIS. A SEVERE THUNDERSTORM WATCH ALSO
REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY MORNING FOR SOUTHEAST IOWA
AND NORTHEAST MISSOURI.

LAT...LON 4114 8987 4115 9043 4107 9044 4108 9117
      4133 9109 4133 9080 4159 9078 4160 9090
      4176 9090 4175 9072 4173 9071 4174 9070
      4172 9038 4159 9019 4158 8986

$$

12

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 7:31 PM CDTSpecial Weather StatementDVNBenton29 min
May 3, 8:23 PM CDTSpecial Weather StatementDVNLouisa, Washington52 min
May 3, 8:23 PM CDTSevere Thunderstorm WarningDVNBenton15 min
May 3, 8:27 PM CDTTornado WarningDVNHenry, Jefferson, Louisa, Washington33 min
May 3, 8:40 PM CDTSevere Thunderstorm WarningDVNCedar, Johnson, Linn35 min
May 3, 8:58 PM CDTTornado WarningDVNHenry, Louisa, Muscatine, Washington32 min
May 3, 9:14 PM CDTSevere Thunderstorm WarningDVNCedar, Clinton, Scott31 min
May 3, 9:29 PM CDTTornado WarningDVNLouisa, Muscatine17 min
May 3, 9:46 PM CDTSevere Thunderstorm WarningDVNCedar, Muscatine, Scott43 min
May 3, 9:58 PM CDTFlash Flood WarningDVNKeokuk, Louisa, Washington6 hr
May 3, 10:20 PM CDTFlash Flood WarningDVNCedar, Johnson, Louisa, Muscatine, Washington6 hr
May 3, 10:22 PM CDTSevere Thunderstorm WarningDVNClinton, Scott38 min
May 3, 11:59 PM CDTFlash Flood WatchDVNDes Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 4 more9 hr
May 4, 12:06 AM CDTSevere Thunderstorm WarningDVNLouisa, Muscatine24 min
May 4, 1:10 AM CDTFlash Flood WarningDVNHenry, Jefferson6 hr
May 4, 2:26 AM CDTSpecial Weather StatementDVNDes Moines, Lee, Van Buren49 min
May 4, 2:40 AM CDTFlash Flood WarningDVNLee, Van Buren6 hr
May 4, 3:07 AM CDTSevere Thunderstorm WarningDVNLee38 min
May 4, 4:04 AM CDTAreal Flood WarningDVNLouisa, Muscatine, Washington9 hr
May 4, 6:26 AM CDTSevere Thunderstorm WarningDVNKeokuk49 min
May 4, 6:34 AM CDTFlash Flood WarningDVNKeokuk4 hr
May 4, 11:59 AM CDTRiver Flood WarningDVNDes Moines, Henry, Lee71 hr
May 4, 3:31 PM CDTFlash Flood WatchDVNBenton, Cedar, Clinton, Des Moines, Henry, Iowa and 12 more11 hr
May 3, 11:13 PM CDTSevere Thunderstorm WarningDVNBureau, Henry49 min
May 4, 12:26 AM CDTFlash Flood WarningDVNBureau, Putnam6 hr

Nearby

Flash Flood Warnings in Illinois, 2012Flash Flood Warnings in Iowa, 2012Every flash flood warning in 2012

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.