Alert archive / Missouri / Areal Flood Advisories in 2021
Areal Flood Advisory 29, NWS St. Louis, MO
NWS St. Louis, MO issued this areal flood advisory at Jul 1, 2021, 5:51 AM CDT for Saint Charles County, Missouri. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 1, 2021, 5:51 AM CDT (10:51 UTC)
- Expired
- Jul 1, 2021, 8:54 AM CDT
- In force
- 3 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
County Saint Charles County, MO
The radar
The St Louis radar (KLSX), 9 km from the middle of the area, began a volume at 10:55 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 00:00Z, 10.9 hours before the alert went out and 234 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
- 573 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 892 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 44 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
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 1, 4:34 AM CDT, 1 hour 17 minutes earlier.
Area forecast discussion, Jul 1, 4:34 AM CDT, 1 hour 17 minutes before
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</html>Hazardous weather outlook, Jul 1, 5:00 AM CDT, 51 minutes before
Hazardous Weather Outlook National Weather Service Saint Louis MO 500 AM CDT Thu Jul 1 2021 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-021000- 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- 500 AM CDT Thu Jul 1 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. There is a chance of thunderstorms today and this evening. A Flash Flood Watch remains in effect early this morning for parts of central and eastern Missouri with locally heavy rainfall expected. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. There is a slight chance of thunderstorms for parts of the area Tuesday through Wednesday. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report any flooding to the National Weather Service. GKS
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 8:41 PM CDT | Areal Flood Advisory | LSX | Saint Charles | 3 hr |
| Jun 30, 10:44 PM CDT | Areal Flood Advisory | LSX | Monroe, Ralls | 7 hr |
| Jul 1, 12:12 AM CDT | Areal Flood Advisory | LSX | Marion, Shelby | 23 min |
| Jul 1, 12:35 AM CDT | Flash Flood Warning | LSX | Marion, Shelby | 3 hr |
| Jul 1, 2:57 AM CDT | Areal Flood Advisory | LSX | Marion, Monroe, Shelby | 3 hr |
| Jul 1, 3:21 AM CDT | Areal Flood Advisory | LSX | Marion, Shelby | 2 hr |
| Jul 1, 5:16 AM CDT | Areal Flood Advisory | LSX | Callaway, Montgomery, Warren | 3 hr |
| Jul 1, 6:04 AM CDT | Areal Flood Advisory | LSX | Boone, Callaway, Cole, Moniteau | 28 min |
| Jul 1, 6:32 AM CDT | Flash Flood Warning | LSX | Boone, Callaway, Cole, Moniteau | 3 hr |
| Jul 1, 6:59 AM CDT | River Flood Warning | LSX | Monroe | 37 hr |
| Jul 1, 8:21 AM CDT | River Flood Warning | LSX | Cole | 32 hr |
| Jul 1, 11:54 AM CDT | River Flood Warning | LSX | Lincoln | 27 hr |
| Jun 30, 8:55 PM CDT | River Flood Warning | LSX | Brown | 21 days |
| Jul 1, 11:28 AM CDT | River Flood Warning | LSX | Morgan, Pike | 21 days |
| Jul 1, 11:30 AM CDT | River Flood Warning | LSX | Calhoun, Greene, Jersey | 21 days |
Nearby
Areal 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.