Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 10, NWS Quad Cities, IA

August 9, 2021Bureau County, Illinois

NWS Quad Cities, IA issued this flash flood warning at Aug 9, 2021, 8:02 PM CDT for Bureau County, Illinois. It was in force for 2 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: Aug 9, 2021, 8:02 PM CDT (01:02 UTC)
Expired: Aug 9, 2021, 10:11 PM CDT
In force: 2 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: None

County Bureau County, IL

The radar

The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 01:04 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, 1.0 hours before the alert went out and 98 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2409 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

781 
WGUS53 KDVN 100102
FFWDVN
ILC011-100700-
/O.NEW.KDVN.FF.W.0010.210810T0102Z-210810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Quad Cities IA IL
802 PM CDT Mon Aug 9 2021

The National Weather Service in Quad Cities has issued a

* Flash Flood Warning for...
  Central Bureau County in north central Illinois...

* Until 200 AM CDT.

* At 802 PM CDT, Emergency management reported Illinois Route 6 near 
  Princeton had water over the road. Park Avenue near the Court 
  House had water covering the road.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management 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...
  Princeton, Hennepin, DePue, Wyanet, Tiskilwa, Bureau Junction, 
  Seatonville, Hollowayville, Bureau  County Fairgrounds and Coal 
  Hollow.

This includes the following highways...
	Interstate 180 between mile markers 2 and 13.
	Interstate 80 in Illinois between mile markers 50 and 66.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4142 8961 4141 8928 4131 8928 4130 8933
      4130 8934 4129 8935 4129 8934 4128 8934
      4127 8934 4126 8934 4126 8935 4126 8958

FLASH FLOOD...OBSERVED

$$

McClure

2 follow-up statements

228 
WGUS73 KDVN 100209
FFSDVN

Flash Flood Statement
National Weather Service Quad Cities IA IL
909 PM CDT Mon Aug 9 2021

ILC011-100700-
/O.CON.KDVN.FF.W.0010.000000T0000Z-210810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bureau IL-
909 PM CDT Mon Aug 9 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 2 AM CDT TUESDAY FOR 
CENTRAL BUREAU COUNTY...

At 909 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3 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...
  Princeton, Hennepin, DePue, Wyanet, Tiskilwa, Bureau Junction, 
  Seatonville, Hollowayville, Bureau  County Fairgrounds and Coal 
  Hollow.

This includes the following highways...
	Interstate 180 between mile markers 2 and 13.
	Interstate 80 in Illinois between mile markers 50 and 66.

Earlier Bureau County Emergency Management reported water over 
Illinois Route 6 near Princeton, and also near the Court House on 
Park Avenue.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 4142 8961 4141 8928 4131 8928 4130 8933
      4130 8934 4129 8935 4129 8934 4128 8934
      4127 8934 4126 8934 4126 8935 4126 8958

FLASH FLOOD...RADAR INDICATED

$$

McClure

979 
WGUS73 KDVN 100311
FFSDVN

Flash Flood Statement
National Weather Service Quad Cities IA IL
1011 PM CDT Mon Aug 9 2021

ILC011-100321-
/O.CAN.KDVN.FF.W.0010.000000T0000Z-210810T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bureau IL-
1011 PM CDT Mon Aug 9 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL BUREAU COUNTY...

Flash flooding is no longer expected to pose a threat. Please 
continue to heed remaining road closures.

LAT...LON 4142 8961 4141 8928 4131 8928 4130 8933
      4130 8934 4129 8935 4129 8934 4128 8934
      4127 8934 4126 8934 4126 8935 4126 8958

$$

McClure

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:12 PM CDT	Tornado Warning Tornado observed	DVN	Bureau	48 min
Aug 9, 7:30 PM CDT	Tornado Warning Tornado observed	DVN	Bureau	45 min
Aug 9, 8:16 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	29 min
Aug 9, 9:39 PM CDT	Special Weather Statement	DVN	Henry	36 min
Aug 9, 9:54 PM CDT	Special Weather Statement	DVN	Henry	51 min
Aug 9, 10:44 PM CDT	Special Weather Statement	DVN	Mercer	31 min
Aug 10, 2:28 PM CDT	Heat Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	29 hr
Aug 10, 4:04 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	56 min
Aug 10, 5:00 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Whiteside	45 min
Aug 10, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	51 min
Aug 10, 5:47 PM CDT	Special Weather Statement	DVN	Bureau	13 min
Aug 10, 5:47 PM CDT	Special Weather Statement	DVN	Bureau	13 min
Aug 10, 5:49 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	41 min
Aug 10, 6:16 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	13 min
Aug 10, 6:50 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	25 min
Aug 10, 6:53 PM CDT	Special Weather Statement	DVN	Mercer, Warren	37 min

Nearby

Flash Flood Warnings in Illinois, 2021 Every 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.