Alert archive / Illinois / Flash Flood Warnings in 2021

Flash Flood Warning 17, NWS St. Louis, MO

June 25, 2021Calhoun County, Greene County, Jersey County, Illinois; Lincoln County, Saint Charles County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jun 25, 2021, 9:29 PM CDT for Calhoun County, Greene County, Jersey County, Illinois; Lincoln County, Saint Charles County, Missouri. 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
Jun 25, 2021, 9:29 PM CDT (02:29 UTC)
Expired
Jun 26, 2021, 3:30 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Calhoun County, IL, Greene County, IL, Jersey County, IL, Lincoln County, MO, Saint Charles County, MO

The radar

The St Louis radar (KLSX), 58 km from the middle of the area, began a volume at 02:30 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

TimeReportWhereRemark
Jun 25, 11:27 PM CDTFLASH FLOODHillview, ILSHERIFFS OFFICE CONSIDERING EVACUATING HILLVIEW DUE TO RAPIDLY RISING WATER LEVELS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 203 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2021-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1254 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2021-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1254 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
910 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.6

Open this sounding in Storm Lab

The text

As transmitted.

435 
WGUS53 KLSX 260229
FFWLSX
ILC013-061-083-MOC113-183-260830-
/O.NEW.KLSX.FF.W.0017.210626T0229Z-210626T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
929 PM CDT Fri Jun 25 2021

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Central Calhoun County in southwestern Illinois...
  Greene County in southwestern Illinois...
  West Central Jersey County in southwestern Illinois...
  Eastern Lincoln County in east central Missouri...
  Northwestern Saint Charles County in east central Missouri...

* Until 330 AM CDT Saturday.

* At 929 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 3 inches are 
  possible in the warned area. 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...
  White Hall, Carrollton, Roodhouse, Winfield, Hardin, Chain of 
  Rocks, Patterson, Kampsville, Wrights, Old Monroe, Fieldon, 
  Batchtown, Eldred, Hillview, Foley, Brussels, Pearl, Hamburg, 
  Woody and Michael.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3889 9087 3918 9072 3922 9072 3927 9068
      3940 9061 3946 9061 3952 9058 3952 9015
      3888 9062

FLASH FLOOD...RADAR INDICATED

$$

Walsh

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 25, 7:15 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Pike45 min
Jun 25, 7:32 PM CDTFlash Flood WarningLSXAdams, Pike6 hr
Jun 26, 1:25 AM CDTAreal Flood WarningLSXAdams, Pike14 hr
Jun 26, 3:29 AM CDTAreal Flood WarningLSXCalhoun, Greene, Jersey9 hr
Jun 26, 11:44 AM CDTRiver Flood WarningLSXMadison7 days
Jun 26, 12:13 PM CDTRiver Flood WarningLSXJackson, Randolph9 days
Jun 26, 1:22 PM CDTTornado WarningLSXGreene15 min
Jun 26, 1:37 PM CDTTornado WarningLSXCalhoun38 min
Jun 26, 2:09 PM CDTSevere Thunderstorm WarningLSXGreene51 min
Jun 25, 7:20 PM CDTSevere Thunderstorm WarningLSXLincoln, Warren40 min
Jun 25, 7:50 PM CDTFlash Flood WarningLSXLincoln, Montgomery, Saint Charles, Warren6 hr
Jun 25, 8:00 PM CDTFlash Flood WarningLSXAudrain, Montgomery, Pike, Ralls6 hr
Jun 25, 8:11 PM CDTFlash Flood WarningLSXBoone, Callaway, Cole, Montgomery, Osage, Warren4 hr
Jun 25, 9:43 PM CDTFlash Flood Warning Considerable damage threatLSXLincoln, Montgomery, Saint Charles, Warren4 hr
Jun 25, 11:32 PM CDTRiver Flood WarningLSXMarion11 hr
Jun 26, 12:43 AM CDTFlash Flood WarningLSXAudrain, Boone, Callaway, Cole, Gasconade, Moniteau and 5 more6 hr
Jun 26, 12:55 AM CDTRiver Flood WarningLSXCole35 hr
Jun 26, 1:48 AM CDTFlash Flood WarningLSXFranklin, Gasconade, Lincoln, Montgomery, Saint Charles, Warren6 hr
Jun 26, 6:25 AM CDTAreal Flood WarningLSXAudrain, Boone, Callaway, Cole, Gasconade, Moniteau and 4 more11 hr
Jun 26, 7:34 AM CDTAreal Flood WarningLSXFranklin, Gasconade, Lincoln, Montgomery, Saint Charles, Warren8 hr
Jun 26, 11:42 AM CDTRiver Flood WarningLSXJefferson, Saint Louis8 days
Jun 26, 3:22 PM CDTAreal Flood WarningLSXLincoln2 hr

Nearby

Flash Flood Warnings in Illinois, 2021Flash Flood Warnings in Missouri, 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.