Alert archive / Illinois / Flash Flood Warnings in 2012
Flash Flood Warning 11, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Aug 4, 2012, 1:39 PM CDT for Scott County, Iowa; Henry County, Rock Island County, Illinois. It was in force for 70 min. 3 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 4, 2012, 1:39 PM CDT (18:39 UTC)
- Expired
- Aug 4, 2012, 2:49 PM CDT
- In force
- 70 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Scott County, IA, Henry County, IL, Rock Island County, IL
The radar
The Quad Cities radar (KDVN), 9 km from the middle of the area, began a volume at 18:41 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 |
|---|---|---|---|
| Aug 4, 1:50 PM CDT | HEAVY RAIN 1.6 | 5 N Davenport, IA | 15 MINUTES FROM DVN AIRPORT ASOS |
| Aug 4, 2:27 PM CDT | HEAVY RAIN 1.13 | 1 W Bettendorf, IA | ALSO WINDS ESTIMATED AROUND 40 MPH. |
| Aug 4, 2:40 PM CDT | HEAVY RAIN 2.45 | 6 N Davenport, IA | RAIN TOTAL FROM 138PM TO 240 PM. PEAK WIND GUST 52 MPH FROM THE WEST NORTHWEST AT 136PM. |
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, 6.7 hours before the alert went out and 9 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.
- Mixed-layer CAPE
- 1247 J/kg
- Mixed-layer CIN
- -144 J/kg
- Mixed-layer LCL
- 1158 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
015 WGUS53 KDVN 041839 FFWDVN IAC163-ILC073-161-042145- /O.NEW.KDVN.FF.W.0011.120804T1839Z-120804T2145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE QUAD CITIES IA IL 139 PM CDT SAT AUG 4 2012 THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHERN SCOTT COUNTY IN EAST CENTRAL IOWA... THIS INCLUDES THE CITIES OF...DAVENPORT...BETTENDORF... WEST CENTRAL HENRY COUNTY IN NORTHWEST ILLINOIS... EASTERN ROCK ISLAND COUNTY IN NORTHWEST ILLINOIS... THIS INCLUDES THE CITIES OF...ROCK ISLAND...MOLINE...EAST MOLINE... * UNTIL 445 PM CDT * AT 137 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. INTENSE RAINFALL FROM THUNDERSTORMS WILL CAUSE URBAN AREA FLASH FLOODING. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE ENTIRE QUAD CITIES METRO AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE ON FLOODED ROADS. MOST FATALITIES OCCUR IN VEHICLES SWEPT AWAY IN FLOOD WATERS AS SHALLOW AS 1 FOOT. FLOODING OF SMALL STREAMS AND CREEKS...STREETS...UNDERPASSES AND LOW LYING URBAN AREAS IS LIKELY. && LAT...LON 4165 9074 4166 9024 4137 9023 4137 9073 $$ WOLF
1 follow-up statement
756 WGUS73 KDVN 041949 FFSDVN FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA IL 249 PM CDT SAT AUG 4 2012 IAC163-ILC073-161-041956- /O.CAN.KDVN.FF.W.0011.000000T0000Z-120804T2145Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SCOTT IA-HENRY IL-ROCK ISLAND IL- 249 PM CDT SAT AUG 4 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL ROCK ISLAND...WEST CENTRAL HENRY AND SOUTHERN SCOTT COUNTIES... LAT...LON 4165 9074 4166 9024 4137 9023 4137 9073 $$ WOLF
The office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 11:18 AM CDT | Special Weather Statement | DVN | Benton, Buchanan, Delaware, Henry, Iowa, Jefferson and 4 more | 102 min |
| Aug 4, 12:05 PM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Delaware, Iowa, Johnson, Keokuk and 2 more | 55 min |
| Aug 4, 12:38 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Delaware, Dubuque, Jackson, Johnson and 5 more | 67 min |
| Aug 4, 12:59 PM CDT | Severe Thunderstorm Warning | DVN | Des Moines, Louisa, Muscatine, Scott | 76 min |
| Aug 4, 1:19 PM CDT | Flash Flood Warning | DVN | Linn | 82 min |
| Aug 4, 1:36 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Carroll, Henry, Jo Daviess, Putnam, Stephenson and 1 more | 84 min |
Nearby
Flash Flood Warnings in Illinois, 2012Flash Flood Warnings in Iowa, 2012Every flash flood warning in 2012
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.