Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Lincoln, IL

June 25, 2021Knox County, Marshall County, Stark County, Illinois

NWS Lincoln, IL issued this flash flood warning at Jun 25, 2021, 1:42 AM CDT for Knox County, Marshall County, Stark County, Illinois. It was in force for 6 hr. 7 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: Jun 25, 2021, 1:42 AM CDT (06:42 UTC)
Expired: Jun 25, 2021, 7:45 AM CDT
In force: 6 hr
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Flood severity: None

Counties Knox County, IL, Marshall County, IL, Stark County, IL

The radar

The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 06:43 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
Jun 25, 6:00 AM CDT	HEAVY RAIN 2.25	Wyoming, IL
Jun 25, 6:00 AM CDT	HEAVY RAIN 3.1	Wataga, IL
Jun 25, 6:45 AM CDT	HEAVY RAIN 2.2	2 Wsw Henry, IL	COCORAHS STATION IL-MH-5 HENRY 1.4 SW.
Jun 25, 7:00 AM CDT	HEAVY RAIN 1.58	Wyoming, IL	COCORAHS STATION IL-SK-7 WYOMING 0.3 SSW.
Jun 25, 7:00 AM CDT	HEAVY RAIN 3.22	Altona, IL
Jun 25, 7:00 AM CDT	HEAVY RAIN 3.27	2 Ene Altona, IL	COCORAHS STATION IL-KX-15 ALTONA 1.7 ENE.
Jun 25, 7:20 AM CDT	HEAVY RAIN 2.28	3 Nnw Sparland, IL	COCORAHS STATION IL-MH-4 SPARLAND 3.4 NNW.

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 00:00Z, 6.7 hours before the alert went out and 87 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: 112 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 817 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 230 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

642 
WGUS53 KILX 250642
FFWILX
ILC095-123-175-251245-
/O.NEW.KILX.FF.W.0007.210625T0642Z-210625T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Lincoln IL
142 AM CDT Fri Jun 25 2021

The National Weather Service in Lincoln has issued a

* Flash Flood Warning for...
  Northern Marshall County in central Illinois...
  Stark County in north central Illinois...
  Northern Knox County in west central Illinois...

* Until 745 AM CDT Friday.

* At 142 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  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...
  Lacon, Henry, Wyoming, Toluca, Toulon, Wenona, Osceola, Wataga, 
  Bradford, Oneida, Altona, Sparland, Varna, Elmira, Victoria, West 
  Jersey, La Fayette, Rio, Castleton and Camp Grove.

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4102 9044 4111 9044 4115 9044 4115 8987
      4123 8987 4123 8964 4115 8964 4115 8933
      4112 8934 4110 8936 4110 8905 4104 8905
      4101 8905

FLASH FLOOD...RADAR INDICATED

$$

MJA

2 follow-up statements

489 
WGUS73 KILX 251002
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
502 AM CDT Fri Jun 25 2021

ILC095-123-175-251245-
/O.CON.KILX.FF.W.0007.000000T0000Z-210625T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox IL-Marshall IL-Stark IL-
502 AM CDT Fri Jun 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 AM CDT THIS 
MORNING FOR NORTHERN MARSHALL, STARK AND NORTHERN KNOX COUNTIES...

At 501 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 5 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly.

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...
  Lacon, Henry, Wyoming, Toluca, Toulon, Wenona, Osceola, Wataga, 
  Bradford, Oneida, Altona, Sparland, Varna, Elmira, Victoria, West 
  Jersey, La Fayette, Rio, Castleton and Camp Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4102 9044 4111 9044 4115 9044 4115 8987
      4123 8987 4123 8964 4115 8964 4115 8933
      4112 8934 4110 8936 4110 8905 4104 8905
      4101 8905

FLASH FLOOD...RADAR INDICATED

$$

Deubelbeiss

743 
WGUS73 KILX 251240
FFSILX

Flash Flood Statement
National Weather Service Lincoln IL
740 AM CDT Fri Jun 25 2021

ILC095-123-175-251250-
/O.EXP.KILX.FF.W.0007.000000T0000Z-210625T1245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox IL-Marshall IL-Stark IL-
740 AM CDT Fri Jun 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 745 AM CDT THIS MORNING FOR 
NORTHERN MARSHALL, STARK AND NORTHERN KNOX COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 700 AM CDT Saturday for 
portions of central Illinois...east central Illinois and west 
central Illinois.

LAT...LON 4102 9044 4111 9044 4115 9044 4115 8987
      4123 8987 4123 8964 4115 8964 4115 8933
      4112 8934 4110 8936 4110 8905 4104 8905
      4101 8905

$$

Deubelbeiss

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 24, 7:56 PM CDT	Special Weather Statement	ILX	Sangamon	49 min
Jun 24, 8:09 PM CDT	Severe Thunderstorm Warning	ILX	Morgan, Sangamon	51 min
Jun 25, 12:33 AM CDT	Severe Thunderstorm Warning	ILX	Cass, Morgan, Schuyler, Scott	72 min
Jun 25, 1:21 AM CDT	Severe Thunderstorm Warning	ILX	Cass, Mason, Menard, Morgan, Sangamon	42 min
Jun 25, 2:52 PM CDT	Special Weather Statement	ILX	Lawrence	23 min
Jun 25, 5:42 PM CDT	Special Weather Statement	ILX	Piatt	33 min
Jun 25, 5:58 PM CDT	Tornado Warning	ILX	DeWitt, Macon, Piatt	32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.