Alert archive / Illinois / Flash Flood Warnings in 2021
Flash Flood Warning 19, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Aug 31, 2021, 3:09 PM CDT for Henry County, Rock Island County, Illinois; Scott County, Iowa. It was in force for 2 hr. 2 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 31, 2021, 3:09 PM CDT (20:09 UTC)
- Expired
- Aug 31, 2021, 5:16 PM CDT
- In force
- 2 hr
- 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), 17 km from the middle of the area, began a volume at 20:12 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 31, 3:42 PM CDT | HEAVY RAIN 1.03 | 1 W Bettendorf, IA | RAINFALL SINCE 1:15 PM. |
| Aug 31, 4:47 PM CDT | HEAVY RAIN 1 | 1 Ene Green River, IL | STILL RAINING. |
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, 8.2 hours before the alert went out and 12 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1564 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
607
WGUS53 KDVN 312009
FFWDVN
IAC163-ILC073-161-010600-
/O.NEW.KDVN.FF.W.0019.210831T2009Z-210901T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
309 PM CDT Tue Aug 31 2021
The National Weather Service in Quad Cities has issued a
* Flash Flood Warning for...
Central Scott County in east central Iowa...
Northwestern Henry IL County in northwestern Illinois...
Southeastern Rock Island County in northwestern Illinois...
* Until 100 AM CDT Wednesday.
* At 309 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly. Minor flooding has been reported and is expected
to worsen.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Davenport, Moline, Rock Island, Bettendorf, East Moline, Silvis,
Eldridge, Milan, Colona, Le Claire, Coal Valley, Hampton, Port
Byron, Walcott, Blue Grass, Buffalo, Andalusia, Rapids City,
Princeton and Riverdale.
This includes the following highways...
Interstate 280 between mile markers 1 and 18.
Interstate 74 in Illinois between mile markers 1 and 16.
Interstate 80 in Iowa between mile markers 287 and 306.
Interstate 74 in Iowa between mile markers 1 and 5.
Interstate 80 in Illinois between mile markers 1 and 14.
Interstate 88 between mile markers 1 and 11.
This includes the following streams and drainages...
Shaffer Creek, Duck Creek, Case Creek, Geneseo Creek, Canoe Creek,
Glynn Creek, Mosquito Creek, Mineral Creek, Lost Creek, Black Hawk
Creek, Coal Creek, Goose Creek, Zuma Creek, Bud Creek, Walnut
Creek, Mill Creek, Silver Creek, Sugar Creek, Mud Creek, Sand
Creek and Hickory Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4157 9077 4168 9069 4168 9044 4162 9017
4159 9017 4159 9018 4159 9019 4158 9018
4158 9017 4150 9014 4137 9037 4138 9051
4138 9055 4139 9075
FLASH FLOOD...RADAR INDICATED
$$
Gibbs2 follow-up statements
048
WGUS73 KDVN 312134
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
434 PM CDT Tue Aug 31 2021
IAC163-ILC073-161-010600-
/O.CON.KDVN.FF.W.0019.000000T0000Z-210901T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Scott IA-Henry IL IL-Rock Island IL-
434 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM CDT WEDNESDAY
FOR SOUTHERN SCOTT, WEST CENTRAL HENRY IL AND SOUTHEASTERN ROCK
ISLAND COUNTIES...
At 434 PM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 4 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Davenport, Moline, Rock Island, Bettendorf, East Moline, Silvis,
Milan, Colona, Le Claire, Coal Valley, Hampton, Blue Grass,
Buffalo, Andalusia, Rapids City, Riverdale, Oak Grove, Warner,
Carbon Cliff and Panorama Park.
This includes the following highways...
Interstate 280 between mile markers 2 and 18.
Interstate 74 in Illinois between mile markers 1 and 16.
Interstate 80 in Iowa between mile markers 293 and 304.
Interstate 74 in Iowa between mile markers 1 and 5.
Interstate 80 in Illinois between mile markers 1 and 4...and
between mile markers 7 and 11.
Interstate 88 near mile marker 1.
This includes the following streams and drainages...
Mill Creek, Mineral Creek, Mississippi River, Shaffer Creek, Rock
River, Black Hawk Creek, Mud Creek, Spencer Creek, Sugar Creek,
Walnut Creek, Silver Creek, Green River, Goose Creek, Coal Creek,
Sand Creek, Mosquito Creek, Duck Creek, Case Creek and Zuma Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4157 9077 4160 9063 4160 9041 4159 9037
4156 9033 4155 9029 4151 9036 4144 9030
4137 9037 4138 9051 4138 9055 4143 9059
4143 9075
FLASH FLOOD...RADAR INDICATED
$$
Gibbs977
WGUS73 KDVN 312216
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
516 PM CDT Tue Aug 31 2021
IAC163-ILC073-161-312226-
/O.CAN.KDVN.FF.W.0019.000000T0000Z-210901T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Scott IA-Henry IL IL-Rock Island IL-
516 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN SCOTT, WEST CENTRAL
HENRY IL AND SOUTHEASTERN ROCK ISLAND COUNTIES...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4157 9077 4160 9063 4160 9041 4159 9037
4156 9033 4155 9029 4151 9036 4144 9030
4137 9037 4138 9051 4138 9055 4143 9059
4143 9075
$$
GibbsThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 1:17 PM CDT | Special Weather Statement | DVN | Rock Island | 58 min |
| Aug 31, 1:22 PM CDT | Special Weather Statement | DVN | Rock Island | 23 min |
| Aug 31, 2:01 PM CDT | Flash Flood Warning | DVN | Henry, Mercer, Rock Island | 6 hr |
| Aug 31, 2:46 PM CDT | Special Weather Statement | DVN | Henry, Rock Island | 59 min |
| Aug 31, 3:41 PM CDT | Special Weather Statement | DVN | Mercer | 64 min |
| Aug 31, 3:49 PM CDT | Flash Flood Warning | DVN | Henry, Mercer | 4 hr |
Nearby
Flash Flood Warnings in Illinois, 2021Flash Flood Warnings in Iowa, 2021Every flash flood warning in 2021
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.