Alert archive / Illinois / Areal Flood Advisories in 2021
Areal Flood Advisory 60, NWS St. Louis, MO
NWS St. Louis, MO issued this areal flood advisory at Jul 16, 2021, 6:15 AM CDT for Randolph County, Saint Clair County, Washington County, Illinois. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2021, 6:15 AM CDT (11:15 UTC)
- Expired
- Jul 16, 2021, 10:15 AM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
Counties Randolph County, IL, Saint Clair County, IL, Washington County, IL
The radar
The St Louis radar (KLSX), 95 km from the middle of the area, began a volume at 11:18 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 00:00Z, 11.3 hours before the alert went out and 228 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
- 8 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1218 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Jul 16, 4:10 AM CDT, 2 hours 5 minutes earlier.
Area forecast discussion, Jul 16, 4:10 AM CDT, 2 hours 5 minutes before
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</html>Hazardous weather outlook, Jul 16, 4:16 AM CDT, 1 hour 59 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 416 AM CDT Fri Jul 16 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-170930- 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- 416 AM CDT Fri Jul 16 2021 This Hazardous Weather Outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Today and tonight. Thunderstorms are expected across much of the area today. These thunderstorms may produce heavy rainfall over similar locations leading to localized flash flooding. A few thunderstorms could also become strong this afternoon with gusty winds. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Thunderstorms are possible across portions of the region Saturday through Monday. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report wind damage and flash flooding to the National Weather Service. Pfahler
In the hours before
Local storm report, Jul 16, 1:00 AM CDT, 5 hours 15 minutes before
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</html>Local storm report, Jul 16, 5:02 AM CDT, 1 hour 13 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 |
|---|---|---|---|---|
| Jul 15, 11:04 PM CDT | Areal Flood Advisory | LSX | Crawford, Iron, Reynolds, Sainte Genevieve, Saint Francois, Washington | 3 hr |
| Jul 15, 11:22 PM CDT | Flash Flood Warning | LSX | Sainte Genevieve, Saint Francois | 5 hr |
| Jul 16, 1:40 AM CDT | Areal Flood Advisory | LSX | Crawford, Jefferson, Sainte Genevieve, Saint Francois, Washington | 3 hr |
| Jul 16, 2:18 AM CDT | Flash Flood Warning | LSX | Washington | 6 hr |
| Jul 15, 9:10 PM CDT | Areal Flood Advisory | LSX | Madison, Monroe, Saint Clair | 3 hr |
| Jul 16, 1:19 PM CDT | Areal Flood Advisory | LSX | Washington | 28 min |
| Jul 16, 1:41 PM CDT | Flash Flood Warning | LSX | Washington | 6 hr |
| Jul 16, 2:57 PM CDT | Areal Flood Advisory | LSX | Marion | 4 hr |
| Jul 16, 3:01 PM CDT | Areal Flood Advisory | LSX | Randolph | 4 hr |
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; radar from the NEXRAD Level II archive.