Alert archive / Missouri / Flash Flood Watches in 2009
Flash Flood Watch 12, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood watch at Jul 3, 2009, 9:15 PM CDT for 7 counties in Missouri; Adams County, Brown County, Pike County, Illinois. It took effect at Jul 4, 2009, 12:00 AM CDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jul 3, 2009, 9:15 PM CDT (02:15 UTC)
- In effect from
- Jul 4, 2009, 12:00 AM CDT
- Expired
- Jul 4, 2009, 4:01 AM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Flood severity
- None
Counties Adams County, IL, Brown County, IL, Pike County, IL, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 139 km from the middle of the area, began a volume at 02:18 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
Topeka, KS (KTOP), launched 00:00Z, 2.3 hours before the alert went out and 365 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
- 969 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 933 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 252 m²/s²
- 0-3 km storm-relative helicity
- 458 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.8
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 3, 7:00 PM CDT, 2 hours 15 minutes earlier.
Area forecast discussion, Jul 3, 7:00 PM CDT, 2 hours 15 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 4, 4:34 AM CDT | Areal Flood Advisory | LSX | Boone, Callaway, Cole, Moniteau | 6 hr |
| Jul 4, 6:18 AM CDT | Flash Flood Warning | LSX | Boone, Callaway, Cole, Moniteau | 6 hr |
| Jul 4, 6:57 AM CDT | Flash Flood Warning | LSX | Franklin, Gasconade, Montgomery, Osage, Saint Charles, Warren | 6 hr |
| Jul 4, 9:28 AM CDT | Areal Flood Advisory | LSX | Jefferson, Saint Charles, Saint Louis, City of Saint Louis | 4 hr |
| Jul 4, 12:00 PM CDT | Areal Flood Warning | LSX | Boone, Callaway | 32 hr |
| Jul 4, 12:31 PM CDT | Areal Flood Advisory | LSX | Lincoln | 6 hr |
| Jul 4, 4:50 PM CDT | River Flood Warning | LSX | Lincoln | 27 hr |
| Jul 4, 12:32 PM CDT | Areal Flood Advisory | LSX | Randolph, Washington | 6 hr |
Nearby
Flash Flood Watches in Missouri, 2009Flash Flood Watches in Illinois, 2009Every flash flood watch in 2009
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.