Alert archive / Iowa / Flash Flood Warnings in 2003

Flash Flood Warning 1, NWS Quad Cities, IA

April 30, 2003Louisa County, Iowa; Mercer County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Apr 30, 2003, 8:00 PM CDT for Louisa County, Iowa; Mercer County, Illinois. It was in force for 5 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
Apr 30, 2003, 8:00 PM CDT (01:00 UTC)
Expired
May 1, 2003, 12:45 AM CDT
In force
5 hr
Issued by
NWS Quad Cities, IA
Area
Counties, with a storm outline in the text

Counties Louisa County, IA, Mercer County, IL

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 01:00 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, 1.0 hours before the alert went out and 54 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 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1022 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 457 square meters per square second.19395878Sfc1 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
1022 J/kg
Mixed-layer CIN
-104 J/kg
Mixed-layer LCL
839 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
457 m²/s²
0-3 km storm-relative helicity
611 m²/s²
Significant tornado parameter
0.0
Supercell composite
12.6

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KDVN 010059
FFWDVN
IAC115-ILC131-010545-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
800 PM CDT WED APR 30 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MERCER COUNTY IN NORTHWEST ILLINOIS
  LOUISA COUNTY IN SOUTHEAST IOWA

* UNTIL 1245 AM CDT

* AT 752 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN WERE LOCATED OVER THE
  WARNED AREA.

* NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATES INDICATE THAT 
  UP 2 TO 3 INCHES OF RAIN HAS FALLEN IN AN AREA FROM WEST OF CAIRO IN
  WESTERN LOUISA COUNTY IOWA TO ALEDO IN MERCER COUNTY ILLINOIS. 
  ADDITIONAL THUNDERSTORMS WITH HEAVY RAIN WERE LOCATED TO THE WEST OVER
  WASHINGTON COUNTY...AND WERE MOVING EAST AT 20 MPH. THESE THUNDERSTORMS
  HAVE THE POTENTIAL TO PRODUCE ANOTHER 2 INCHES OF RAIN BY 10 PM OVER 
  LOUISA AND MERCER COUNTIES. THIS RAIN...AND THE ADDITIONAL EXPECTED
  HEAVY RAINFALL WILL CAUSE LOCAL STREAMS AND RIVERS TO RISE RAPIDLY
  AND OVERFLOW THEIR BANKS.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
QUICKLY MOVE TO HIGHER GROUND TO ESCAPE FLOOD WATERS.

DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED ROADWAYS. THE WATER MAY
BE TOO DEEP TO CROSS SAFELY OR THE ROAD COULD BE WASHED OUT. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

LAT...LON 4110 9045 4111 9133 4135 9144 4132 9045

$$

DLF
2 follow-up statements
000 
WGUS73 KDVN 010407 CCA
FFSDVN
IAC115-ILC131-010545-

FLASH FLOOD STATEMENT...CORRECTED COUNTY CODES AND HEADLINE
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1048 PM CDT WED APR 30 2003

...A FLASH FLOOD WARNING CONTINUES UNTIL 1245 AM THURSDAY CDT FOR 
LOUISA AND MERCER COUNTIES...

AT 1048 PM CDT...MOST OF THE HEAVY RAIN PRODUCING THUNDERSTORMS HAVE
MOVED OUT OF THE AREA.  RADAR WAS INDICATING SCATTERED STRONG 
THUNDERSTORMS FROM WAPELLO TO EAST OF ELIZA MOVING EAST AT 40 MPH.

RADAR RAINFALL ESTIMATES SHOW THAT UP TO 4 INCHES OF RAIN MAY HAVE
FALLEN OVER NORTHERN WAPELLO COUNTY WHILE A SWATH OF RAIN OF 4 TO 6
INCHES OR MORE FELL FROM EAST OF JOY THROUGH ALEDO  TO SOUTHEAST OF
SHERARD. 

THE LOUISA COUNTY SHERIFF REPORTED THAT DITCHES WERE OVERFLOWING ALONG
HIGHWAY 61 NORTH OF WAPELLO AND STREET FLOODING DUE TO BACKED UP STORM
DRAINS WAS OCCURRING IN WAPELLO AND GRANDVIEW.  THE MERCER COUNTY 
SHERIFFS OFFICE SAID NUMEROUS REPORTS OF FLOODING HAVE BEEN CALLED
IN TO THEIR OFFICE.  SOME OF THE MORE SIGNIFICANT REPORTS INCLUDE
AS MUCH AS 2 TO 3 FT OF WATER OVER SOME STREETS IN ALEDO...WATER 
3 TO 4 FT DEEP OVER 30TH AVENUE JUST WEST OF HIGHWAY 94...WATER OF
UNKNOWN DEPTH RUNNING OVER ROUTE 17  AND ROUTE 94 SOUTH OF ALEDO.
A SHERIFFS DEPUTY ALSO ADVISED THAT POPE CREEK WAS AT BANK FULL AND
WOULD LIKELY OVERFLOW ITS BANKS BY MORNING.

EVEN THOUGH MOST OF THE RAIN HAS ENDED...SCATTERED THUNDERSTORMS THROUGH
MIDNIGHT AND CONTINUED EXCESSIVE RUNOFF WILL CONTINUE TO AGGRAVATE
THE ONGOING FLOODING.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
QUICKLY MOVE TO HIGHER GROUND TO ESCAPE FLOOD WATERS.

DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED ROADWAYS. THE WATER MAY
BE TOO DEEP TO CROSS SAFELY OR THE ROAD COULD BE WASHED OUT. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

$$

DLF
000 
WGUS73 KDVN 010557
FFSDVN
IAC115-ILC131-010615-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1250 AM CDT THU MAY 1 2003

...THE FLASH FLOOD WARNING WHICH WAS IN EFFECT UNTIL 1245 AM CDT FOR 
LOUISA AND MERCER COUNTIES...HAS BEEN ALLOWED TO EXPIRE...

THE HEAVY RAINFALL HAS SUBSIDED OVER THE WARNED AREA. PEOPLE WITH 
INTERESTS ALONG POPE CREEK AND THE EDWARDS RIVER SHOULD STILL 
MONITOR THOSE AREAS FOR HIGH WATER...BUT OTHER STREAMS AND CREEKS 
HAVE RECEDED OR WERE BEGINNING TO RECEDE. THUS MANY OF THE FLOOD 
THREATS WERE ENDING. EVEN THOUGH STREAMS AND CREEKS WERE RECEDING... 
SOME ROADWAYS MAY STILL BE COVERED WITH WATER.  MOTORISTS ARE 
ADVISED TO AVOID DRIVING THROUGH FLOODED ROADWAYS. 

NUISANCE FLOODING WILL LAST INTO THURSDAY MORNING IN MUCH OF 
LOUISA AND MERCER COUNTIES.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...
QUICKLY MOVE TO HIGHER GROUND TO ESCAPE FLOOD WATERS.

DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED ROADWAYS. THE WATER MAY
BE TOO DEEP TO CROSS SAFELY OR THE ROAD COULD BE WASHED OUT. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.

$$

12

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 7:06 PM CDTSevere Thunderstorm WarningDVNJefferson39 min
Apr 30, 7:11 PM CDTTornado WarningDVNWashington34 min
Apr 30, 7:28 PM CDTSevere Thunderstorm WarningDVNJefferson17 min
Apr 30, 7:43 PM CDTSevere Thunderstorm WarningDVNJohnson32 min
Apr 30, 7:46 PM CDTSevere Thunderstorm WarningDVNJefferson29 min
Apr 30, 7:50 PM CDTSevere Thunderstorm WarningDVNLouisa40 min
Apr 30, 7:53 PM CDTSevere Thunderstorm WarningDVNHenry37 min
Apr 30, 7:58 PM CDTSevere Thunderstorm WarningDVNMuscatine47 min
Apr 30, 8:14 PM CDTSevere Thunderstorm WarningDVNBenton, Buchanan, Linn46 min
Apr 30, 8:32 PM CDTSevere Thunderstorm WarningDVNDelaware28 min
Apr 30, 9:27 PM CDTSevere Thunderstorm WarningDVNDes Moines48 min
Apr 30, 9:33 PM CDTSevere Thunderstorm WarningDVNBuchanan27 min
Apr 30, 9:38 PM CDTSevere Thunderstorm WarningDVNJones, Linn22 min
Apr 30, 10:05 PM CDTSevere Thunderstorm WarningDVNBenton, Iowa25 min
Apr 30, 10:42 PM CDTSevere Thunderstorm WarningDVNLee48 min
Apr 30, 7:20 PM CDTTornado WarningDVNHenry55 min
Apr 30, 8:22 PM CDTTornado WarningDVNHenry38 min
Apr 30, 8:25 PM CDTSevere Thunderstorm WarningDVNRock Island50 min
Apr 30, 8:36 PM CDTSevere Thunderstorm WarningDVNMercer39 min
Apr 30, 8:44 PM CDTTornado WarningDVNBureau61 min
Apr 30, 8:55 PM CDTTornado WarningDVNBureau50 min
Apr 30, 9:02 PM CDTSevere Thunderstorm WarningDVNHenry58 min
Apr 30, 9:24 PM CDTFlash Flood WarningDVNHenry5 hr
Apr 30, 9:37 PM CDTTornado WarningDVNPutnam38 min
Apr 30, 9:42 PM CDTSevere Thunderstorm WarningDVNHenderson48 min
Apr 30, 9:48 PM CDTTornado WarningDVNBureau57 min
Apr 30, 10:02 PM CDTSevere Thunderstorm WarningDVNWarren43 min
Apr 30, 10:15 PM CDTTornado WarningDVNPutnam45 min

Nearby

Flash Flood Warnings in Iowa, 2003Flash Flood Warnings in Illinois, 2003Every flash flood warning in 2003

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.