Alert archive / Illinois / Flash Flood Warnings in 2021
Flash Flood Warning 18, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Aug 31, 2021, 2:01 PM CDT for Henry County, Mercer County, Rock Island County, Illinois. It was in force for 6 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
- Aug 31, 2021, 2:01 PM CDT (19:01 UTC)
- Expired
- Aug 31, 2021, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Henry County, IL, Mercer County, IL, Rock Island County, IL
The radar
The Quad Cities radar (KDVN), 31 km from the middle of the area, began a volume at 19:00 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, 2:30 PM CDT | FLASH FLOOD | 1 Se Sherrard, IL | A FEW ROADS NEAR FYRE LAKE IMPASSIBLE DUE TO WATER. |
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, 7.0 hours before the alert went out and 31 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.
804
WGUS53 KDVN 311901
FFWDVN
ILC073-131-161-010100-
/O.NEW.KDVN.FF.W.0018.210831T1901Z-210901T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
201 PM CDT Tue Aug 31 2021
The National Weather Service in Quad Cities has issued a
* Flash Flood Warning for...
West Central Henry IL County in northwestern Illinois...
Northeastern Mercer County in northwestern Illinois...
Southeastern Rock Island County in northwestern Illinois...
* Until 800 PM CDT.
* At 201 PM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
4 and 5 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. A public report of 4.5
inches in one hour was received from Sherrard.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Orion, Sherrard, Cable, Lynn Center and Swedona.
This includes the following highways...
Interstate 74 in Illinois near mile marker 24.
This includes the following streams and drainages...
Mill Creek, Rock River, Edwards River, Camp Creek, Mud Creek, Coal
Creek, Mosquito Creek and Case Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4136 9055 4139 9055 4138 9037 4128 9033
4128 9055
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Gibbs3 follow-up statements
003
WGUS73 KDVN 312026
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
326 PM CDT Tue Aug 31 2021
ILC073-131-161-010100-
/O.CON.KDVN.FF.W.0018.000000T0000Z-210901T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Henry IL IL-Mercer IL-Rock Island IL-
326 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING
FOR WEST CENTRAL HENRY IL, NORTHEASTERN MERCER AND SOUTHEASTERN ROCK
ISLAND COUNTIES...
At 326 PM CDT, the public reported thunderstorms producing heavy
rain across the warned area. Between 4 and 5 inches of rain have
fallen. Flash flooding is ongoing. Some roads around Fyre lake were
covered in water around 230 PM CDT. The water is beginning to recede
however some water may remain over roads at this time.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Public reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Orion, Sherrard, Cable, Lynn Center and Swedona.
This includes the following highways...
Interstate 74 in Illinois near mile marker 25.
This includes the following streams and drainages...
Mill Creek, Rock River, Edwards River, Camp Creek, Mud Creek, Coal
Creek, Mosquito Creek and Case Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4136 9055 4139 9055 4138 9037 4128 9033
4128 9055
FLASH FLOOD...OBSERVED
$$
Gibbs384
WGUS73 KDVN 312136
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
436 PM CDT Tue Aug 31 2021
ILC073-131-161-010100-
/O.CON.KDVN.FF.W.0018.000000T0000Z-210901T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Henry IL IL-Mercer IL-Rock Island IL-
436 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING
FOR WEST CENTRAL HENRY IL, NORTHEASTERN MERCER AND SOUTHEASTERN ROCK
ISLAND COUNTIES...
At 436 PM CDT, the public reported thunderstorms producing heavy
rain across the warned area. Between 4 and 6 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Public reported.
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...
Orion, Sherrard, Cable, Lynn Center and Swedona.
This includes the following highways...
Interstate 74 in Illinois near mile marker 25.
This includes the following streams and drainages...
Mill Creek, Rock River, Edwards River, Camp Creek, Mud Creek, Coal
Creek, Mosquito Creek and Case Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4136 9055 4139 9055 4138 9037 4128 9033
4128 9055
FLASH FLOOD...OBSERVED
$$
Gibbs049
WGUS73 KDVN 010058
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
758 PM CDT Tue Aug 31 2021
ILC073-131-161-010108-
/O.EXP.KDVN.FF.W.0018.000000T0000Z-210901T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Henry IL IL-Mercer IL-Rock Island IL-
758 PM CDT Tue Aug 31 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 8 PM CDT THIS EVENING FOR WEST
CENTRAL HENRY IL, NORTHEASTERN MERCER AND SOUTHEASTERN ROCK ISLAND
COUNTIES...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
LAT...LON 4136 9055 4139 9055 4138 9037 4128 9033
4128 9055
$$
McClureThe 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, 2:46 PM CDT | Special Weather Statement | DVN | Henry, Rock Island | 59 min |
| Aug 31, 3:09 PM CDT | Flash Flood Warning | DVN | Henry, Rock Island | 2 hr |
| 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, 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.