Alert archive / Illinois / Areal Flood Warnings in 2018
Areal Flood Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this areal flood warning at Sep 7, 2018, 4:31 PM CDT for Adams County, Illinois. It was in force for 18 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 7, 2018, 4:31 PM CDT (21:31 UTC)
- Expired
- Sep 8, 2018, 10:32 AM CDT
- In force
- 18 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Adams County, IL
The radar
The St Louis radar (KLSX), 150 km from the middle of the area, began a volume at 21:32 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, 9.5 hours before the alert went out and 221 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
- 21 J/kg
- Mixed-layer CIN
- -103 J/kg
- Mixed-layer LCL
- 672 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 147 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
What forecasters said that day
The local office's own words before this areal flood warning 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 warning went out at Sep 7, 3:43 PM CDT, 48 minutes earlier.
Area forecast discussion, Sep 7, 3:43 PM CDT, 48 minutes before
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</html>Hazardous weather outlook, Sep 7, 3:53 PM CDT, 38 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 353 PM CDT Fri Sep 7 2018 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-081115- Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- 353 PM CDT Fri Sep 7 2018 ...FLASH FLOOD WATCH UNTIL 7 AM CDT SUNDAY... This hazardous weather outlook is for portions of eastern and central Missouri as well as west central and southwest Illinois. .DAY ONE...Tonight There is a chance of thunderstorms, and heavy rain is likely this evening and overnight. A Flash Flood Watch is in effect for the entire area. .DAYS TWO THROUGH SEVEN...Saturday through Thursday There is a chance for thunderstorms, and heavy rain is likely through Sunday over parts of the area. A Flash Flood Watch is in effect for the entire area through early Sunday morning due to this expected heavy rainfall. The highest rainfall amounts will be just north of I-70 and also in southwest IL. Flash flooding is most likely in these areas. .SPOTTER INFORMATION STATEMENT... Spotters are asked to call in any flooding reports or rainfall reports greater than one inch. BSH
In the hours before
Local storm report, Sep 7, 11:37 AM CDT, 4 hours 54 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 |
|---|---|---|---|---|
| Sep 6, 9:01 PM CDT | River Flood Warning | LSX | Marion | 4 days |
| Sep 6, 10:20 PM CDT | River Flood Warning | LSX | Lewis | 6 days |
| Sep 7, 5:10 AM CDT | River Flood Warning | LSX | Lewis | 4 days |
| Sep 7, 10:12 AM CDT | Areal Flood Advisory | LSX | Lewis | 3 hr |
| Sep 7, 6:01 PM CDT | River Flood Warning | LSX | Marion | 30 hr |
| Sep 7, 6:33 PM CDT | Flash Flood Warning | LSX | Crawford | 6 hr |
| Sep 6, 8:26 PM CDT | River Flood Warning | LSX | Brown | 60 hr |
| Sep 7, 10:33 AM CDT | Flash Flood Warning | LSX | Adams | 6 hr |
| Sep 7, 5:31 PM CDT | Flash Flood Warning | LSX | Bond, Fayette, Macoupin, Montgomery | 6 hr |
Nearby
Areal Flood Warnings in Illinois, 2018Every areal flood warning in 2018
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.