Alert archive / Iowa / Flash Flood Warnings in 2012

Flash Flood Warning 5, NWS Quad Cities, IA

May 4, 2012Henry County, Jefferson County, Iowa

NWS Quad Cities, IA issued this flash flood warning at May 4, 2012, 1:10 AM CDT for Henry County, Jefferson County, Iowa. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 4, 2012, 1:10 AM CDT (06:10 UTC)
Expired
May 4, 2012, 7:15 AM CDT
In force
6 hr
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

Counties Henry County, IA, Jefferson County, IA

The radar

The Quad Cities radar (KDVN), 125 km from the middle of the area, began a volume at 06:13 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, 6.2 hours before the alert went out and 131 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.

902 
WGUS53 KDVN 040610
FFWDVN
IAC087-101-041215-
/O.NEW.KDVN.FF.W.0005.120504T0610Z-120504T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
110 AM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HENRY COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF MOUNT PLEASANT...
  JEFFERSON COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF FAIRFIELD...

* UNTIL 715 AM CDT

* AT 104 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  VERY HEAVY RAINFALL OF 1 TO 2 INCHES CAUSING FLASH FLOODING FROM 
  THUNDERSTORMS MOVING OVER THE WARNED AREA.  STORMS AFFECTED THIS 
  AREA THURSDAY EVENING...AND NOW MORE STORMS ARE POISED TO 
  MOVE ACROSS THE AREA...BRINGING HEAVY RAINFALL RATES OF 1 TO 2 
  INCHES PER HOUR.  

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MAHARISHI
  VEDIC CITY...WINFIELD...WAYLAND...OLDS...MOUNT UNION...PLEASANT
  PLAIN...PACKWOOD AND ABINGDON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4116 9219 4116 9138 4082 9137 4081 9172
      4090 9172 4090 9218

$$

LE
2 follow-up statements
251 
WGUS73 KDVN 040916
FFSDVN

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

IAC087-101-041215-
/O.CON.KDVN.FF.W.0005.000000T0000Z-120504T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON IA-HENRY IA-
416 AM CDT FRI MAY 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 AM CDT FOR HENRY
AND JEFFERSON COUNTIES...

AT 408 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT MOST THUNDERSTORMS HAD MOVED OUT OF THE WARNED AREA.  
HOWEVER...A FEW WEAKER SHOWERS AND A FEW STORMS ARE EXPECTED TO MOVE 
THROUGH THE AREA IN THE NEXT COUPLE HOURS.  THUNDERSTORMS LAST NIGHT 
PRODUCED RAINFALL AMOUNTS FROM 1.5 TO 2.5 INCHES...AND LIKELY 
RESULTED IN FLASH FLOODING FOR MANY AREAS.  PLEASE SEND ANY REPORTS 
OF FLASH FLOODING TO THE NATIONAL WEATHER SERVICE.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LIBERTYVILLE...WESTWOOD...MAHARISHI VEDIC CITY...WINFIELD...
WAYLAND...ROME...OLDS...MOUNT UNION...MOUNT PLEASANT...PLEASANT
PLAIN...PACKWOOD...LOCKRIDGE...FAIRFIELD...BATAVIA AND ABINGDON.

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 4116 9219 4116 9138 4082 9137 4081 9172
      4090 9172 4090 9218

$$

LE
544 
WGUS73 KDVN 041226
FFSDVN

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

IAC087-101-041229-
/O.EXP.KDVN.FF.W.0005.000000T0000Z-120504T1215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON IA-HENRY IA-
726 AM CDT FRI MAY 4 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR HENRY AND JEFFERSON
COUNTIES...

WIDESPREAD STORMS PRODUCING VERY HEAVY RAINFALL HAVE MOVED OUT OF 
MOST OF THE PREVIOUSLY WARNED AREA...AND LITTLE LINGERING FLOODING 
HAS BEEN REPORTED RECENTLY. HOWEVER...A NARROW BAND OF THUNDERSTORMS 
WAS STILL MOVING SLOWLY NORTHEASTWARD ACROSS THE PREVIOUSLY WARNED 
AREA FROM NORTHWEST OF FAIRFIELD TO SOUTHEAST OF MOUNT PLEASANT. 
THUS LOCALIZED ADDITIONAL RAINFALL AMOUNTS UP TO AN INCH MAY BE 
POSSIBLE IN PORTIONS OF THE AREA THROUGH 9 AM CDT. 


LAT...LON 4116 9219 4116 9138 4082 9137 4081 9172
      4090 9172 4090 9218

$$

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, 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, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.