Alert archive / Illinois / Flash Flood Warnings in 2016

Flash Flood Warning 23, NWS Quad Cities, IA

August 28, 2016Henry County, Whiteside County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Aug 28, 2016, 5:23 PM CDT for Henry County, Whiteside County, Illinois. It was in force for 6 hr. 4 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
Aug 28, 2016, 5:23 PM CDT (22:23 UTC)
Expired
Aug 28, 2016, 11:15 PM CDT
In force
6 hr
Issued by
NWS Quad Cities, IA
Area
Storm-based polygon
Flood severity
None

Counties Henry County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 55 km from the middle of the area, began a volume at 22:27 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

TimeReportWhereRemark
Aug 28, 5:40 PM CDTFLASH FLOODSterling, ILSIGNFICANT WATER ON ROADS WITH CURRENT. FLOODED CITY YARDS AND PARKING LOTS. PHOTOS POSTED ON SOCIAL MEDIA TO NWS.
Aug 28, 5:48 PM CDTFLASH FLOOD2 Nw Geneseo, ILVEHICLE WASHED OFF ROAD INTO DITCH WITH ONGOING WATER RESCUE. OCCURRED NEAR GREEN RIVER.
Aug 28, 6:30 PM CDTFLASH FLOODLyndon, ILWATER OVER COUNTY ROAD. FIRE PAGED OUT TO CLOSE ROAD...BUT IMPROVEMENT OCCURRED A SHORT TIME LATER. ROAD IS NOW OPEN.
Aug 28, 8:34 PM CDTFLASH FLOODOsco, ILVEHICLE OFF THE ROAD ON ITS SIDE DUE TO WATER OVER THE HIGHWAY.

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 12:00Z, 10.4 hours before the alert went out and 48 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 12:00Z on 2016-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1238 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 12:00Z on 2016-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
1238 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
797 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted.

739 
WGUS53 KDVN 282223
FFWDVN
ILC073-195-290415-
/O.NEW.KDVN.FF.W.0023.160828T2223Z-160829T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
523 PM CDT SUN AUG 28 2016

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HENRY COUNTY IN NORTHWESTERN ILLINOIS... 
  WHITESIDE COUNTY IN NORTHWESTERN ILLINOIS...

* UNTIL 1115 PM CDT

* AT 522 PM CDT...TRAINED WEATHER SPOTTERS REPORTED THUNDERSTORMS
  PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY. WATER IS REPORTED TO BE COMPLETELY OVER
  HIGHWAY 30 NEAR STERLING...DUE TO HEAVY RAIN COMPLETLY FILLING
  DITCHES AND SPREADING OVER THE HIGHWAY. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  STERLING...ROCK FALLS...CAMBRIDGE...GENESEO...COLONA...
  PROPHETSTOWN...ORION...ATKINSON...ANNAWAN...TAMPICO...LYNDON...
  ANDOVER...HOOPPOLE...DEER GROVE...WARNER...LYNN CENTER...EMERSON...
  OSCO...ROUND GROVE AND AGNEW.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 INTERSTATE 80 IN ILLINOIS BETWEEN MILE MARKERS 9 AND 34.
 INTERSTATE 88 BETWEEN MILE MARKERS 25 AND 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4159 8967 4158 8986 4145 8986 4128 8996
      4129 9043 4143 9041 4153 9018 4180 8990
      4186 8963 4174 8963

$$

ERVIN
2 follow-up statements
010 
WGUS73 KDVN 282354
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
654 PM CDT SUN AUG 28 2016

ILC073-195-290415-
/O.CON.KDVN.FF.W.0023.000000T0000Z-160829T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HENRY IL-WHITESIDE IL-
654 PM CDT SUN AUG 28 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT FOR
HENRY AND WHITESIDE COUNTIES...

AT 652 PM CDT...DOPPLER RADAR INDICATED HEAVY RAIN ACROSS THE WARNED
AREA. UP TO THREE INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING
IS ALREADY OCCURRING. FLASH FLOODING IN URBAN AREAS IS BEGINNING TO
SUBSIDE, BUT RURAL FLOODING MAY CONTIUE FOR SOME TIME, ESPECIALLY
SOUTH OF INTERSTATE 80 IN HENRY COUNTY ILLINOIS.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
STERLING...ROCK FALLS...CAMBRIDGE...GENESEO...COLONA...
PROPHETSTOWN...ORION...ATKINSON...ANNAWAN...TAMPICO...LYNDON...
ANDOVER...HOOPPOLE...DEER GROVE...WARNER...LYNN CENTER...EMERSON...
OSCO...ROUND GROVE AND AGNEW.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4159 8967 4158 8986 4145 8986 4128 8996
      4129 9043 4143 9041 4153 9018 4180 8990
      4186 8963 4174 8963

$$

ERVIN
193 
WGUS73 KDVN 290228
FFSDVN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL
928 PM CDT SUN AUG 28 2016

ILC073-195-290238-
/O.CAN.KDVN.FF.W.0023.000000T0000Z-160829T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HENRY IL-WHITESIDE IL-
928 PM CDT SUN AUG 28 2016

...THE FLASH FLOOD WARNING FOR HENRY AND 
WHITESIDE COUNTIES IS CANCELLED...

FLOOD WATERS HAVE RECEDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES.

LAT...LON 4159 8967 4158 8986 4145 8986 4128 8996
      4129 9043 4143 9041 4153 9018 4180 8990
      4186 8963 4174 8963

$$

ERVIN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 9:47 PM CDTSpecial Weather StatementDVNHenry28 min
Aug 27, 10:49 PM CDTSpecial Weather StatementDVNHenry41 min
Aug 27, 11:26 PM CDTSpecial Weather StatementDVNHenry64 min
Aug 28, 10:15 AM CDTSpecial Weather StatementDVNHancock60 min
Aug 28, 10:45 AM CDTRiver Flood WatchDVNHenderson, Mercer7 days
Aug 28, 10:45 AM CDTRiver Flood WatchDVNHenderson8 days
Aug 28, 10:45 AM CDTRiver Flood WatchDVNHancock, Henderson7 days
Aug 28, 4:22 PM CDTSpecial Weather StatementDVNHenry53 min

Nearby

Flash Flood Warnings in Illinois, 2016Every flash flood warning in 2016

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.