Alert archive / Iowa / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS Quad Cities, IA

May 25, 20115 counties in Iowa

NWS Quad Cities, IA issued this flash flood warning at May 25, 2011, 4:55 PM CDT for 5 counties in Iowa. It was in force for 5 hr. 2 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 25, 2011, 4:55 PM CDT (21:55 UTC)
Expired: May 25, 2011, 9:58 PM CDT
In force: 5 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

Counties Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Van Buren County, IA

The radar

The Quad Cities radar (KDVN), 129 km from the middle of the area, began a volume at 21:56 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
May 25, 5:01 PM CDT	FLASH FLOOD	Burlington, IA	ROADS FLOODED NEAR HIGHWAY 61 NEAR FUN CITY AND KIRKWOOD STREET.
May 25, 5:07 PM CDT	FLASH FLOOD	Burlington, IA	ROADS FLOODED BOTH WAYS ON ROSEVELT NEAR FUN CITY.

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

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.9 hours before the alert went out and 257 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: 1832 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 561 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 253 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 10.1

Open this sounding in Storm Lab

The text

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

265 
WGUS53 KDVN 252155
FFWDVN
IAC057-087-101-111-177-260345-
/O.NEW.KDVN.FF.W.0003.110525T2155Z-110526T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
455 PM CDT WED MAY 25 2011

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN DES MOINES COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF BURLINGTON...
  SOUTHERN HENRY COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF MOUNT PLEASANT...
  SOUTHERN JEFFERSON COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF FAIRFIELD...
  LEE COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF FORT MADISON...
  VAN BUREN COUNTY IN SOUTHEAST IOWA...
  THIS INCLUDES THE CITY OF KEOSAUQUA...

* UNTIL 1045 PM CDT

* AT 443 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
FLASH FLOODING FROM A CLUSTER OF THUNDERSTORMS IN SOUTHEAST IOWA.  
RAINFALL AMOUNTS BETWEEN 1 AND 3 INCHES HAS ALREADY FALLEN...AND AN 
ADDITIONAL ONE OR TWO INCHES IS POSSIBLE.

* ADDITIONAL LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
SALEM...STOCKPORT...WESTWOOD... ROME...NEW LONDON...LIBERTYVILLE... 
BATAVIA...DANVILLE AND BIRMINGHAM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLASH FLOODING IS LIKELY ON HONEY CREEK IN VAN BUREN COUNTY...CEDAR 
CREEK IN JEFFERSON COUNTY...AND LOST CREEK IN LEE COUNTY.

FLOODING OF ADDITIONAL SMALL STREAMS AND CREEKS...COUNTY ROADS...AND 
LOW LYING FARMLAND IS ALSO LIKELY.

&&

LAT...LON 4104 9218 4091 9102 4081 9110 4067 9113
      4064 9119 4064 9130 4057 9141 4050 9137
      4042 9138 4057 9169 4061 9173 4061 9178
      4079 9218

$$

WOLF

2 follow-up statements

265 
WGUS73 KDVN 252305
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
605 PM CDT WED MAY 25 2011

IAC057-087-101-111-177-260345-
/O.CON.KDVN.FF.W.0003.000000T0000Z-110526T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VAN BUREN IA-LEE IA-JEFFERSON IA-HENRY IA-DES MOINES IA-
605 PM CDT WED MAY 25 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR
SOUTHERN DES MOINES...SOUTHERN HENRY...SOUTHERN JEFFERSON...LEE AND
VAN BUREN COUNTIES...

AT 601 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE HEAVIEST RAIN HAS MOVED NORTH OF THE AREA...BUT LIGHT TO 
MODERATE RAIN CONTINUES.  THUS THE FLASH FLOOD THREAT PERSISTS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WESTWOOD...
SALEM...ROME...NEW LONDON...MOUNT PLEASANT...LOWELL...HILLSBORO...
LIBERTYVILLE...FAIRFIELD...BATAVIA...WEST BURLINGTON...MIDDLETOWN...
DANVILLE...BURLINGTON...STOCKPORT...KEOSAUQUA...DOUDS/LEANDO...
BONAPARTE...BIRMINGHAM...BENTONSPORT/VERNON...WEST POINT...ST.
PAUL...PILOT GROVE AND DENMARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE ACROSS FLOODED ROADS.

&&

LAT...LON 4104 9218 4091 9102 4081 9110 4067 9113
      4064 9119 4064 9130 4057 9141 4050 9137
      4042 9138 4057 9169 4061 9173 4061 9178
      4079 9218

$$

WOLF

740 
WGUS73 KDVN 260258
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
958 PM CDT WED MAY 25 2011

IAC057-087-101-111-177-260307-
/O.CAN.KDVN.FF.W.0003.000000T0000Z-110526T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
VAN BUREN IA-LEE IA-JEFFERSON IA-HENRY IA-DES MOINES IA-
958 PM CDT WED MAY 25 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHERN DES
MOINES...SOUTHERN HENRY...SOUTHERN JEFFERSON...LEE AND VAN BUREN
COUNTIES...

WATER HAS RECEDED FROM ROADS ACROSS THE AREA AND NO FURTHER 
RAINFALL IS EXPECTED...THUS THE FLASH FLOOD WARNING HAS BEEN 
CANCELLED.

LAT...LON 4104 9218 4091 9102 4081 9110 4067 9113
      4064 9119 4064 9130 4057 9141 4050 9137
      4042 9138 4057 9169 4061 9173 4061 9178
      4079 9218

$$

NICHOLS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 2:20 AM CDT	Special Weather Statement	DVN	Lee, Van Buren	70 min
May 25, 2:38 AM CDT	Flash Flood Watch	DVN	Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more	20 hr
May 25, 3:46 AM CDT	Special Weather Statement	DVN	Des Moines, Iowa, Johnson, Keokuk, Louisa, Muscatine and 1 more	59 min
May 25, 6:37 AM CDT	River Flood Warning	DVN	Iowa, Johnson	7 days
May 25, 6:37 AM CDT	River Flood Warning	DVN	Lee	52 hr
May 25, 9:27 AM CDT	River Flood Warning	DVN	Clinton, Scott	12 hr
May 25, 9:27 AM CDT	River Flood Warning	DVN	Keokuk	12 hr
May 25, 9:27 AM CDT	River Flood Warning	DVN	Des Moines, Henry, Lee	6 days
May 25, 11:46 AM CDT	River Flood Warning	DVN	Des Moines	13 days
May 25, 11:46 AM CDT	River Flood Warning	DVN	Des Moines, Lee	14 days
May 25, 11:46 AM CDT	River Flood Warning	DVN	Johnson, Washington	34 hr
May 25, 2:31 PM CDT	Wind Advisory	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 12 more	7 hr
May 25, 3:41 PM CDT	River Flood Warning	DVN	Lee, Van Buren	20 hr
May 25, 4:08 PM CDT	Severe Thunderstorm Warning	DVN	Van Buren	52 min
May 25, 4:35 PM CDT	Tornado Warning	DVN	Des Moines, Henry, Lee	40 min
May 25, 5:05 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Louisa	40 min
May 25, 5:11 PM CDT	Tornado Warning	DVN	Des Moines, Louisa	23 min
May 25, 5:34 PM CDT	Flash Flood Warning	DVN	Des Moines, Louisa	4 hr

Nearby

Flash Flood Warnings in Iowa, 2011 Every flash flood warning in 2011

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.