Alert archive / Illinois / Areal Flood Warnings in 2021
Areal Flood Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this areal flood warning at Aug 21, 2021, 2:53 PM CDT for Marion 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
- Aug 21, 2021, 2:53 PM CDT (19:53 UTC)
- Expired
- Aug 21, 2021, 5:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Marion County, IL
The radar
The Evansville,IN radar (KVWX), 110 km from the middle of the area, began a volume at 19:55 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
Lincoln, IL (KILX), launched 12:00Z, 7.9 hours before the alert went out and 180 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
- 286 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 817 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
530 WGUS43 KLSX 211953 FLWLSX BULLETIN - IMMEDIATE BROADCAST REQUESTED Flood Warning National Weather Service St Louis MO 253 PM CDT Sat Aug 21 2021 ILC121-212245- /O.NEW.KLSX.FA.W.0009.210821T1953Z-210821T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marion IL- 253 PM CDT Sat Aug 21 2021 The National Weather Service in St Louis has issued a * Flood Warning for Urban area and small stream in... Southern Marion County in south central Illinois... * Until 545 PM CDT. * At 253 PM CDT, Emergency management reported flooding is already occurring. Between 2 and 3 inches of rain fell in the past 2 hours. Showers and storms have moved out of the area. * Some locations that will experience flooding include... Salem, Odin, Iuka, Kell, Walnut Hill, Cartter and Selmaville. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3847 8905 3866 8905 3867 8881 3847 8870 $$ Byrd
1 follow-up statement
405 WGUS83 KLSX 212241 FLSLSX Flood Statement National Weather Service St Louis MO 541 PM CDT Sat Aug 21 2021 ILC121-212251- /O.EXP.KLSX.FA.W.0009.000000T0000Z-210821T2245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Marion IL- 541 PM CDT Sat Aug 21 2021 ...THE URBAN AREA AND SMALL STREAM FLOOD WARNING WILL EXPIRE AT 545 PM CDT THIS AFTERNOON FOR SOUTHERN MARION COUNTY IN SOUTH CENTRAL ILLINOIS... Significant flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3847 8905 3866 8905 3867 8881 3847 8870 $$ Fuchs
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 2:10 PM CDT | Areal Flood Advisory | LSX | Marion | 43 min |
Nearby
Areal Flood Warnings in Illinois, 2021Every areal 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.