Alert archive / Iowa / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Quad Cities, IA

May 3, 2012Keokuk County, Louisa County, Washington County, Iowa

NWS Quad Cities, IA issued this flash flood warning at May 3, 2012, 9:58 PM CDT for Keokuk County, Louisa County, Washington County, Iowa. It was in force for 6 hr. 5 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
May 3, 2012, 9:58 PM CDT (02:58 UTC)
Expired
May 4, 2012, 4:00 AM CDT
In force
6 hr
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

Counties Keokuk County, IA, Louisa County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 90 km from the middle of the area, began a volume at 02:58 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, 9:58 PM CDTFLASH FLOOD5 Sw Washington, IASTREETS ARE FLOODED IN WASHINGTON. WATER IS ESTIMATED TO BE 3 FEET DEEP NEAR AN UNDERPASS NEAR 2ND AVE AND E 5TH STREET. ALSO THE INTERSECTION OF MADISON AND B AVE IS FLOODED. SEWERS IN TOWN ARE BACKING UP.
May 3, 10:27 PM CDTFLASH FLOOD1 Ese Washington, IA3.13 INCHES IN THE PAST 2 HOURS WITH STREET FLOODING IN WASHINGTON.
May 3, 10:27 PM CDTHEAVY RAIN 3.131 Ese Washington, IA2 HOUR RAINFALL.
May 3, 11:45 PM CDTFLASH FLOODColumbus Junction, IATHE WEST SIDE OF TOWN IS FLOODED. HE57.
May 4, 12:25 AM CDTFLASH FLOOD1 W Columbus Junction, IAHIGHWAY 92 WEST OF COLUMBUS JUNCTION IS IMPASSABLE. LO32.

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, 3.0 hours before the alert went out and 97 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.

618 
WGUS53 KDVN 040258
FFWDVN
IAC107-115-183-040900-
/O.NEW.KDVN.FF.W.0001.120504T0258Z-120504T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KEOKUK COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF SIGOURNEY...
  LOUISA COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITIES OF...WAPELLO...COLUMBUS JUNCTION...
  WASHINGTON COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF WASHINGTON...

* UNTIL 400 AM CDT FRIDAY

* AT 953 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.  A 
  SPOTTER REPORTED OVER 2 INCHES OF RAINFALL IN LESS THAN AN HOUR 
  NEAR WASHINGTON.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LETTS...
  WHAT CHEER...SOUTH ENGLISH...KINROSS...KESWICK...HARPER...DELTA...
  WELLMAN...RICHMOND AND KALONA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL OF 1 TO 2 INCHES IS EXPECTED FROM ADDITIONAL 
THUNDERSTORMS OCCURRING OVER THE AREA.

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

&&

LAT...LON 4151 9241 4151 9172 4142 9148 4141 9137
      4133 9138 4133 9107 4126 9111 4108 9115
      4107 9135 4109 9137 4116 9137 4116 9140
      4116 9241

$$

LE
2 follow-up statements
869 
WGUS73 KDVN 040522
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1222 AM CDT FRI MAY 4 2012

IAC107-115-183-040900-
/O.CON.KDVN.FF.W.0001.000000T0000Z-120504T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON IA-LOUISA IA-KEOKUK IA-
1222 AM CDT FRI MAY 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 AM CDT FOR
KEOKUK...LOUISA AND WASHINGTON COUNTIES...

AT 1216 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH 
FLOODING OVER THE WARNED AREA FROM MULTIPLE THUNDERSTORMS AFFECTING 
THE AREA.  HEAVY RAINFALL OF 3 INCHES OR MORE IN LESS THAN 2 HOURS 
AND STREET FLOODING HAS BEEN REPORTED IN WASHINGTON.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GRANDVIEW...
COTTER...COLUMBUS JUNCTION...WHAT CHEER...SOUTH ENGLISH...
SIGOURNEY...KINROSS...KESWICK...HARPER...DELTA...WELLMAN...
WASHINGTON...RICHMOND...KALONA AND AINSWORTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FRIDAY MORNING FOR
SOUTHEAST IOWA AND NORTHEAST MISSOURI. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 500 AM CDT FRIDAY MORNING FOR
NORTHWESTERN ILLINOIS.

&&

LAT...LON 4151 9241 4151 9172 4142 9148 4141 9137
      4133 9138 4133 9107 4126 9111 4108 9115
      4107 9135 4109 9137 4116 9137 4116 9140
      4116 9241

$$

LE
724 
WGUS73 KDVN 040906
FFSDVN

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

IAC107-115-183-040915-
/O.EXP.KDVN.FF.W.0001.000000T0000Z-120504T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON IA-LOUISA IA-KEOKUK IA-
406 AM CDT FRI MAY 4 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR KEOKUK...LOUISA AND
WASHINGTON COUNTIES...

THE FLASH FLOOD WARNING HAS BEEN REPLACED IN PART BY AN AREAL FLOOD 
WARNING.  PLEASE REFER TO THE LATEST 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 4151 9241 4151 9172 4142 9148 4141 9137
      4133 9138 4133 9107 4126 9111 4108 9115
      4107 9135 4109 9137 4116 9137 4116 9140
      4116 9241

$$

LE

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, 10:20 PM CDTFlash Flood WarningDVNCedar, Johnson, Louisa, Muscatine, Washington6 hr
May 3, 10:22 PM CDTSevere Thunderstorm WarningDVNClinton, Scott38 min
May 3, 10:44 PM CDTFlash Flood WarningDVNLouisa, Scott6 hr
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

Nearby

Flash 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.