Alert archive / Illinois / Flash Flood Warnings in 2011

Flash Flood Warning 10, NWS Quad Cities, IA

June 9, 2011Whiteside County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Jun 9, 2011, 6:40 AM CDT for Whiteside County, Illinois. It was in force for 6 hr. 10 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: Jun 9, 2011, 6:40 AM CDT (11:40 UTC)
Expired: Jun 9, 2011, 12:45 PM CDT
In force: 6 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

County Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 59 km from the middle of the area, began a volume at 11:41 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
Jun 9, 6:40 AM CDT	FLASH FLOOD	Rock Falls, IL	WATER OVER ROADS AND INTERSECTIONS IN TOWN. DEPTH IS OVER TOP OF CAR WHEEL.
Jun 9, 6:46 AM CDT	FLASH FLOOD	Rock Falls, IL	RT. 40 AND HWY 30 BY WALMART FLOODED. WEST 10TH AND RT. 40 BY SAVE A LOT FLOODED INCLUDING PARKING LOT. WEST 10TH AND 5TH INTERSECTION TOTALLY ININDATED WITH WATER.
Jun 9, 6:50 AM CDT	FLASH FLOOD	Rock Falls, IL	HWY 30 BETWEEN 8TH AND 4TH STREETS FLOODED BOTH LANES. 5TH AVE FROM WEST 12 THROUGH 14TH FLOODED DEEP ENOUGH TO GO INTO YARDS. ALSO IS UP TO HOOD DEEP ON CAR ON 5TH AVE.
Jun 9, 7:03 AM CDT	HEAVY RAIN 3	Rock Falls, IL
Jun 9, 7:39 AM CDT	FLASH FLOOD	Rock Falls, IL	SEVERAL STREETS STILL FLOODED IN TOWN. SOME ARE RECEEDING AT THIS TIME.
Jun 9, 8:39 AM CDT	HEAVY RAIN 2.5	1 Wnw Morrison, IL	24 HOUR TOTAL
Jun 9, 9:00 AM CDT	HEAVY RAIN 1.81	1 Ssw Coleta, IL
Jun 9, 9:00 AM CDT	HEAVY RAIN 2.06	6 Nw Morrison, IL
Jun 9, 9:00 AM CDT	HEAVY RAIN 2.15	3 E Morrison, IL
Jun 9, 10:51 AM CDT	HEAVY RAIN 1.36	Sterling, IL	RAINFALL SINCE MIDNIGHT.

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, 11.7 hours before the alert went out and 52 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: 2717 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1625 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

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

368 
WGUS53 KDVN 091140
FFWDVN
ILC195-091745-
/O.NEW.KDVN.FF.W.0010.110609T1140Z-110609T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
640 AM CDT THU JUN 9 2011

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WHITESIDE COUNTY IN NORTHWEST ILLINOIS...
  THIS INCLUDES THE CITIES OF...STERLING...ROCK FALLS...MORRISON...

* UNTIL 1245 PM CDT

* AT 637 AM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH   
FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. WATER IS OVER 
ROADS IN ROCK FALLS.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO GARDEN
  PLAIN...EMERSON...EAST CLINTON AND COLETA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING OF SMALL STREAMS AND CREEKS...HIGHWAYS AND STREETS...
UNDERPASSES AND LOW LYING URBAN AND RURAL AREAS IS LIKELY.

&&

LAT...LON 4159 8969 4168 9023 4169 9023 4192 9013
      4193 8962 4159 8963

$$

ERVIN

2 follow-up statements

810 
WGUS73 KDVN 091443
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
943 AM CDT THU JUN 9 2011

ILC195-091745-
/O.CON.KDVN.FF.W.0010.000000T0000Z-110609T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WHITESIDE IL-
943 AM CDT THU JUN 9 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
WHITESIDE COUNTY...

AT 938 AM CDT...NO RAIN WAS FALLING ACROSS THE WARNED AREA. 
HOWEVER...LIGHT TO MODERATE RAIN WAS CROSSING THE MISSISSIPPI RIVER 
AND APPROACHING WHITESIDE COUNTY.

WHITESIDE SHERIFF REPORTED THAT WATER WAS OVER EMERSON ROAD WEST OF 
STERLING ROCK FALLS EARLIER THIS MORNING.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STERLING...
ROCK FALLS...MORRISON...GARDEN PLAIN...EMERSON...EAST CLINTON AND
COLETA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOODING OF SMALL STREAMS AND CREEKS...HIGHWAYS AND STREETS...
UNDERPASSES AND LOW LYING URBAN AND RURAL AREAS IS LIKELY.

&&

LAT...LON 4159 8969 4168 9023 4169 9023 4192 9013
      4193 8962 4159 8963

$$

08

615 
WGUS73 KDVN 091743
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1243 PM CDT THU JUN 9 2011

ILC195-091752-
/O.EXP.KDVN.FF.W.0010.000000T0000Z-110609T1745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WHITESIDE IL-
1243 PM CDT THU JUN 9 2011

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1245 PM CDT FOR WHITESIDE
COUNTY...

NO RAIN HAS FALLEN ACROSS WHITESIDE COUNTY FOR MOST OF THE MORNING. 
LAW ENFORCEMENT HAVE NO NEW REPORTS OF FLOODING.

LAT...LON 4159 8969 4168 9023 4169 9023 4192 9013
      4193 8962 4159 8963

$$

08

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 9:06 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	39 min
Jun 8, 9:32 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson	43 min
Jun 9, 12:39 AM CDT	Special Weather Statement	DVN	Rock Island	51 min
Jun 9, 2:20 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Whiteside	25 min
Jun 9, 2:56 AM CDT	Special Weather Statement	DVN	Whiteside	49 min
Jun 9, 3:12 AM CDT	Flash Flood Watch	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	28 hr
Jun 9, 5:12 AM CDT	Severe Thunderstorm Warning	DVN	Henry, Mercer, Rock Island, Whiteside	63 min
Jun 9, 5:43 AM CDT	Severe Thunderstorm Warning	DVN	Bureau, Henry, Putnam, Whiteside	62 min

Nearby

Flash Flood Warnings in Illinois, 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.