Alert archive / Illinois / Areal Flood Advisories in 2021
Areal Flood Advisory 75, NWS St. Louis, MO
NWS St. Louis, MO issued this areal flood advisory at Aug 8, 2021, 4:35 PM CDT for Ralls County, Missouri; Adams County, Pike County, Illinois. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 8, 2021, 4:35 PM CDT (21:35 UTC)
- Expired
- Aug 8, 2021, 7:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Adams County, IL, Pike County, IL, Ralls County, MO
The radar
The St Louis radar (KLSX), 121 km from the middle of the area, began a volume at 21:35 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 12:00Z, 9.6 hours before the alert went out and 220 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
- 567 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1067 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- -8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 St. Louis, MO wrote its last area forecast discussion before this areal flood advisory went out at Aug 8, 4:30 PM CDT, 5 minutes earlier.
Area forecast discussion, Aug 8, 4:30 PM CDT, 5 minutes before
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</html>Hazardous weather outlook, Aug 8, 3:02 PM CDT, 1 hour 33 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 302 PM CDT Sun Aug 8 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-092015- Adams IL-Audrain MO-Bond IL-Boone MO-Brown IL-Calhoun IL-Callaway MO- Clinton IL-Cole MO-Crawford MO-Fayette IL-Franklin MO-Gasconade MO- Greene IL-Iron MO-Jefferson MO-Jersey IL-Knox MO-Lewis MO-Lincoln MO- Macoupin IL-Madison IL-Madison MO-Marion IL-Marion MO-Moniteau MO- Monroe IL-Monroe MO-Montgomery IL-Montgomery MO-Osage MO-Pike IL- Pike MO-Ralls MO-Randolph IL-Reynolds MO-Saint Charles MO- Saint Clair-Saint Francois MO-Saint Louis City MO-Saint Louis MO- Sainte Genevieve MO-Shelby MO-Warren MO-Washington IL-Washington MO- 302 PM CDT Sun Aug 8 2021 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Tonight. Thunderstorms are likely through tonight. A few of the thunderstorms through this evening could be severe, with large hail and damaging winds being the main threats. Locally heavy rainfall will also be possible this afternoon into tonight, which could result in isolated instances of flash flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Heat index readings will be in the 100 to 110 degree range over parts of the area during the afternoon and early evening hours from Monday into Thursday. A heat advisory is now in effect for much of the area on Monday. There is a chance for thunderstorms over portions of the area from Monday through Saturday. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed through tonight. Britt
In the hours before
Local storm report, Aug 8, 3:24 PM CDT, 1 hour 11 minutes before
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</html>Local storm report, Aug 8, 4:09 PM CDT, 26 minutes before
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</html>Local storm report, Aug 8, 4:23 PM CDT, 12 minutes before
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</html>The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 2:37 PM CDT | Heat Advisory | LSX | Audrain, Boone, Callaway, Cole, Crawford, Franklin and 23 more | 4 days |
| Aug 8, 2:43 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Gasconade | 47 min |
| Aug 8, 3:19 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Lincoln, Saint Charles, Warren | 41 min |
| Aug 8, 3:54 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Saint Charles | 66 min |
| Aug 8, 2:54 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown, Pike | 50 min |
Nearby
Areal Flood Advisories in Illinois, 2021Areal Flood Advisories in Missouri, 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; radar from the NEXRAD Level II archive.