Alert archive / Iowa / Flash Flood Warnings in 2011

Flash Flood Warning 28, NWS Quad Cities, IA

July 28, 2011Buchanan County, Delaware County, Iowa

NWS Quad Cities, IA issued this flash flood warning at Jul 28, 2011, 1:13 AM CDT for Buchanan County, Delaware County, Iowa. It was in force for 5 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: Jul 28, 2011, 1:13 AM CDT (06:13 UTC)
Expired: Jul 28, 2011, 6:37 AM CDT
In force: 5 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

Counties Buchanan County, IA, Delaware County, IA

The radar

The Quad Cities radar (KDVN), 133 km from the middle of the area, began a volume at 06:15 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
Jul 28, 5:50 AM CDT	HEAVY RAIN 3.07	Edgewood, IA	STORM TOTAL

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, 6.2 hours before the alert went out and 137 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: 4556 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 141 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 3.9
Supercell composite: 19.4

Open this sounding in Storm Lab

The text

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

132 
WGUS53 KDVN 280613
FFWDVN
IAC019-055-281500-
/O.NEW.KDVN.FF.W.0028.110728T0613Z-110728T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
113 AM CDT THU JUL 28 2011

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BUCHANAN COUNTY IN NORTHEAST IOWA...
  THIS INCLUDES THE CITY OF INDEPENDENCE...
  DELAWARE COUNTY IN NORTHEAST IOWA...
  THIS INCLUDES THE CITY OF MANCHESTER...

* UNTIL 1000 AM CDT

* AT 102 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  VERY HEAVY RAINFALL FROM THUNDERSTORMS CAUSING FLASH FLOODING OVER
  THE WARNED AREA.  RAINFALL AMOUNTS ALREADY RANGE FROM 2 TO 4 
  INCHES ALONG HIGHWAY 20 IN DELAWARE COUNTY...AND MORE
  THUNDERSTORMS CONTINUE TO MOVE INTO THE AREA FROM THE WEST.    
  RAINFALL RATES OF OVER AN INCH PER HOUR HAVE BEEN OBSERVED THIS 
  EVENING.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WINTHROP...
  JESUP...DELHI...MANCHESTER...INDEPENDENCE...MASONVILLE...
  GREELEY...EARLVILLE...DELAWARE...COLESBURG AND EDGEWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL OF 1 TO 2 INCHES IS POSSIBLE BEFORE THE STORMS 
MOVE OUT OF THE AREA.  

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

&&

LAT...LON 4265 9113 4229 9113 4230 9207 4246 9207
      4247 9208 4264 9209

$$

LE

1 follow-up statement

167 
WGUS73 KDVN 281137
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
637 AM CDT THU JUL 28 2011

IAC019-055-281143-
/O.CAN.KDVN.FF.W.0028.000000T0000Z-110728T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DELAWARE IA-BUCHANAN IA-
637 AM CDT THU JUL 28 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR BUCHANAN AND
DELAWARE COUNTIES...

SIGNIFICANT PRECIPITATION HAS MOVED AWAY FROM THE WARNED AREA AND 
WATER LEVELS HAVE RECEDED OVER ALL BUT EASTERN DELAWARE COUNTY. 
THEREFORE...THE WARNING IS CANCELLED FOR ALL BUT EASTERN PORTIONS OF 
DELAWARE COUNTY.

FOR EASTERN PORTIONS OF DELAWARE COUNTY...THIS PRODUCT IS REPLACED 
WITH AN AREAL FLOOD WARNING UNTIL 4 PM CDT FOR EASTERN PORTIONS OF 
DELAWARE COUNTY. SIGNIFICANT FLOODING CONTINUES DUE TO 2 TO 8 INCHES 
OF RAIN THAT HAS OCCURRED OVER THIS SECTION THE PAST 9 HOURS.

LAT...LON 4265 9113 4229 9113 4230 9207 4246 9207
      4247 9208 4264 9209

$$

NICHOLS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 7:10 PM CDT	Flash Flood Warning	DVN	Dubuque, Jackson	9 hr
Jul 27, 7:35 PM CDT	Tornado Warning	DVN	Dubuque, Jackson	40 min
Jul 27, 8:29 PM CDT	Tornado Warning	DVN	Dubuque, Jackson	46 min
Jul 27, 9:16 PM CDT	Tornado Warning	DVN	Jackson	31 min
Jul 27, 11:55 PM CDT	Flash Flood Warning	DVN	Jackson	4 hr
Jul 28, 12:50 AM CDT	Special Weather Statement	DVN	Delaware, Dubuque, Jackson	55 min
Jul 28, 4:10 AM CDT	Areal Flood Warning	DVN	Delaware, Dubuque, Jackson, Jones	12 hr
Jul 28, 9:26 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Linn	64 min
Jul 28, 9:40 AM CDT	Special Weather Statement	DVN	Muscatine, Scott	50 min
Jul 28, 10:15 AM CDT	River Flood Warning	DVN	Dubuque, Jackson	6 hr
Jul 28, 10:15 AM CDT	River Flood Warning	DVN	Jackson	6 hr
Jul 28, 12:03 PM CDT	Heat Advisory	DVN	Des Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 2 more	10 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.