Alert archive / Illinois / Areal Flood Advisories in 2021
Areal Flood Advisory 23, NWS Lincoln, IL
NWS Lincoln, IL issued this areal flood advisory at Aug 9, 2021, 2:26 AM CDT for Clay County, Illinois. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 9, 2021, 2:26 AM CDT (07:26 UTC)
- Expired
- Aug 9, 2021, 5:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Lincoln, IL
- Area
- Storm-based polygon
County Clay County, IL
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 7.4 hours before the alert went out and 156 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
- 2009 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1044 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Lincoln, IL wrote its last area forecast discussion before this areal flood advisory went out at Aug 9, 12:11 AM CDT, 2 hours 15 minutes earlier.
Area forecast discussion, Aug 9, 12:11 AM CDT, 2 hours 15 minutes before
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</html>Hazardous weather outlook, Aug 8, 3:46 PM CDT, 10 hours 40 minutes before
Hazardous Weather Outlook National Weather Service Lincoln IL 346 PM CDT Sun Aug 8 2021 ILZ027>031-036>038-040>043-047>053-091100- Cass-Christian-De Witt-Fulton-Knox-Logan-Macon-Marshall-Mason- McLean-Menard-Morgan-Peoria-Sangamon-Schuyler-Scott-Stark- Tazewell-Woodford- 346 PM CDT Sun Aug 8 2021 This Hazardous Weather Outlook is for portions of central Illinois and west central Illinois. .DAY ONE...TONIGHT... Thunderstorms are expected to increase in western Illinois this afternoon and evening, and move into eastern Illinois later in the evening. A few of the storms may be strong to locally severe, especially late afternoon and early evening, with damaging winds the main concern, but isolated hail possible as well. Ahead of the storms, the heat index is expected to reach around 100 degrees. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... Periodic thunderstorms are expected from Monday through mid week. A few of the storms Monday and Tuesday may be on the strong side, though the risk on Wednesday is more uncertain. Heat index values of 95 to 100 degrees are expected Monday and around 105 Tuesday, followed by near 100 degrees Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required this afternoon and evening, with the most likely time frame from 4 pm to 9 pm. ILZ044>046-054>057-061-062-066-067-071-091100- Champaign-Clay-Coles-Cumberland-Douglas-Edgar-Effingham-Jasper- Moultrie-Piatt-Shelby-Vermilion- 346 PM CDT Sun Aug 8 2021 This Hazardous Weather Outlook is for portions of central Illinois, east central Illinois and southeast Illinois. .DAY ONE...TONIGHT... Thunderstorms are expected this evening. A few of the storms may be strong to locally severe, with damaging winds the main concern, but isolated hail is possible as well. Ahead of the storms, the heat index is expected to range from 95 to 100 degrees this afternoon. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... Periodic thunderstorms are expected from Monday through mid week. A few of the storms Monday and Tuesday may be on the strong side, though the risk on Wednesday is more uncertain. Heat index values near 100 to 105 degrees are expected Tuesday, and will be close to 100 degrees Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this evening, with the most likely time frame from 5 pm to 10 pm. ILZ063-068-072-073-091100- Clark-Crawford-Lawrence-Richland- 346 PM CDT Sun Aug 8 2021 This Hazardous Weather Outlook is for portions of east central Illinois and southeast Illinois. .DAY ONE...TONIGHT... Thunderstorms are expected to move into the area tonight. At the current time, it appears the higher severe weather threat will be further west. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... Periodic thunderstorms are expected from Monday through mid week. A few of the storms Monday and Tuesday may be on the strong side, though the risk on Wednesday is more uncertain. Heat index values of 100 to 105 degrees are expected Tuesday, and will be close to 100 degrees Wednesday and Thursday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated through tonight. 37
In the hours before
Local storm report, Aug 8, 9:38 PM CDT, 4 hours 48 minutes before
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</html>Local storm report, Aug 8, 9:43 PM CDT, 4 hours 43 minutes before
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</html>Local storm report, Aug 8, 9:49 PM CDT, 4 hours 37 minutes before
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</html>Local storm report, Aug 8, 9:50 PM CDT, 4 hours 36 minutes before
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</html>Local storm report, Aug 9, 12:25 AM CDT, 2 hours 1 minute before
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</html>Local storm report, Aug 9, 12:40 AM CDT, 1 hour 46 minutes before
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</html>The office that day
Everything else NWS Lincoln, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 7:20 PM CDT | Areal Flood Advisory | ILX | McLean | 115 min |
| Aug 9, 6:28 AM CDT | Areal Flood Advisory | ILX | Christian, Macon, Moultrie, Shelby | 3 hr |
| Aug 9, 7:07 AM CDT | Areal Flood Advisory | ILX | Logan, Menard, Sangamon | 3 hr |
| Aug 9, 10:50 AM CDT | Areal Flood Advisory | ILX | Clay, Crawford, Effingham, Jasper | 2 hr |
| Aug 9, 1:54 PM CDT | Heat Advisory | ILX | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 29 hr |
| Aug 9, 3:07 PM CDT | River Flood Warning | ILX | Clay, Richland | 6 days |
Nearby
Areal Flood Advisories in Illinois, 2021Every areal flood advisory 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.