Alert archive / Missouri / Flash Flood Warnings in 2021
Flash Flood Warning 25, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jul 12, 2021, 4:26 AM CDT for Warren County, Missouri. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 12, 2021, 4:26 AM CDT (09:26 UTC)
- Expired
- Jul 12, 2021, 8:00 AM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Warren County, MO
The radar
The St Louis radar (KLSX), 33 km from the middle of the area, began a volume at 09:30 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, 9.4 hours before the alert went out and 271 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
- 460 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 553 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
754
WGUS53 KLSX 120926
FFWLSX
MOC219-121300-
/O.NEW.KLSX.FF.W.0025.210712T0926Z-210712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
426 AM CDT Mon Jul 12 2021
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southeastern Warren County in east central Missouri...
* Until 800 AM CDT.
* At 426 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 3 inches of rain
have fallen. The expected rainfall rate is 1 to 3 inches in 1
hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Washington, Marthasville and Dutzow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3860 9113 3870 9107 3869 9096 3855 9096
3857 9102 3860 9104 3861 9106 3861 9108
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR
$$
Gosselin2 follow-up statements
716
WGUS73 KLSX 121115
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
615 AM CDT Mon Jul 12 2021
MOC219-121300-
/O.CON.KLSX.FF.W.0025.000000T0000Z-210712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren MO-
615 AM CDT Mon Jul 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING
FOR SOUTHEASTERN WARREN COUNTY...
At 615 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 2 and 5 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Washington, Marthasville and Dutzow.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3860 9113 3870 9107 3869 9096 3855 9096
3857 9102 3860 9104 3861 9106 3861 9108
FLASH FLOOD...RADAR INDICATED
$$
Gosselin412
WGUS73 KLSX 121256
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
756 AM CDT Mon Jul 12 2021
MOC219-121306-
/O.EXP.KLSX.FF.W.0025.000000T0000Z-210712T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Warren MO-
756 AM CDT Mon Jul 12 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 8 AM CDT THIS MORNING FOR
SOUTHEASTERN WARREN COUNTY...
The heavy rain has ended, yet light to moderate showers continue
this morning. Flooding of low lying areas is likely to continue but
flash flooding is no longer expected. Please continue to heed
remaining road closures.
LAT...LON 3860 9113 3870 9107 3869 9096 3855 9096
3857 9102 3860 9104 3861 9106 3861 9108
$$
CVKINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 8:05 PM CDT | River Flood Warning | LSX | Lewis | 58 hr |
| Jul 12, 1:42 AM CDT | Areal Flood Advisory | LSX | Franklin | 5 hr |
| Jul 12, 3:46 AM CDT | Areal Flood Advisory | LSX | Warren | 40 min |
| Jul 12, 5:09 AM CDT | Flash Flood Warning | LSX | Saint Charles | 4 hr |
| Jul 12, 5:56 AM CDT | Areal Flood Advisory | LSX | Callaway, Gasconade, Osage | 5 hr |
| Jul 12, 1:12 PM CDT | Areal Flood Advisory | LSX | Lincoln | 3 hr |
| Jul 12, 2:14 PM CDT | Flash Flood Warning | LSX | Lincoln, Montgomery | 4 hr |
| Jul 12, 6:27 PM CDT | Areal Flood Advisory | LSX | Pike | 3 hr |
Nearby
Flash Flood Warnings in Missouri, 2021Every flash flood warning 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.