Alert archive / Illinois / Flash Flood Warnings in 2021
Flash Flood Warning 1, NWS Quad Cities, IA
NWS Quad Cities, IA issued this flash flood warning at Jun 9, 2021, 9:35 PM CDT for Carroll County, Illinois. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2021, 9:35 PM CDT (02:35 UTC)
- Expired
- Jun 10, 2021, 12:48 AM CDT
- In force
- 3 hr
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Flood severity
- None
County Carroll County, IL
The radar
The Quad Cities radar (KDVN), 64 km from the middle of the area, began a volume at 02:38 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.6 hours before the alert went out and 59 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
- 402 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1694 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
547
WGUS53 KDVN 100235
FFWDVN
ILC015-100830-
/O.NEW.KDVN.FF.W.0001.210610T0235Z-210610T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
935 PM CDT Wed Jun 9 2021
The National Weather Service in Quad Cities has issued a
* Flash Flood Warning for...
Central Carroll County in northwestern Illinois...
* Until 330 AM CDT.
* At 935 PM CDT, Doppler radar indicated slow moving thunderstorms
producing heavy rain across the warned area. Between 2 and 4
inches of rain have fallen. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flash flooding include...
Mount Carroll, Savanna, Argo Fay, Thomson, Center Hill and Wacker.
At 923 PM, a trained spotter reported 3.85 inches of rain has fallen
in Mount Carroll.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4197 9006 4197 9004 4204 8990 4219 8993
4217 9013 4198 9013 4197 9012
FLASH FLOOD...RADAR INDICATED
$$
Sheets2 follow-up statements
489
WGUS73 KDVN 100352
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
1052 PM CDT Wed Jun 9 2021
ILC015-100830-
/O.CON.KDVN.FF.W.0001.000000T0000Z-210610T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carroll IL-
1052 PM CDT Wed Jun 9 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT THURSDAY
FOR CENTRAL CARROLL COUNTY...
At 1052 PM CDT, Doppler radar indicated slow moving thunderstorms
producing heavy rain were redeveloping over the warned area. Radar
and spotter reports indicated rainfall amounts between 2 and 4
inches has already fallen this evening over the Mount Carroll area.
Additional rainfall of one half to one inch can be expected through
midnight, leading to flash flooding.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Doppler radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Mount Carroll, Savanna, Argo Fay, Thomson, Center Hill and Wacker.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4197 9006 4197 9004 4204 8990 4219 8993
4217 9013 4198 9013 4197 9012
FLASH FLOOD...RADAR INDICATED
$$
Sheets441
WGUS73 KDVN 100548
FFSDVN
Flash Flood Statement
National Weather Service Quad Cities IA IL
1248 AM CDT Thu Jun 10 2021
ILC015-100558-
/O.CAN.KDVN.FF.W.0001.000000T0000Z-210610T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Carroll IL-
1248 AM CDT Thu Jun 10 2021
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL CARROLL COUNTY...
The heavy rain has ended so additional flooding is no longer
expected to pose a threat. Please continue to heed any road closures
or be aware of high water across the area as rainfall runoff moves
into area streams and creeks.
LAT...LON 4197 9006 4197 9004 4204 8990 4219 8993
4217 9013 4198 9013 4197 9012
$$
BrooksThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 8:43 PM CDT | Special Weather Statement | DVN | Carroll | 32 min |
| Jun 9, 9:02 PM CDT | Special Weather Statement | DVN | Carroll | 28 min |
| Jun 9, 9:50 PM CDT | Special Weather Statement | DVN | Jo Daviess | 40 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.