Alert archive / Missouri / Flash Flood Warnings in 2021
Flash Flood Warning 39, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Aug 26, 2021, 7:51 PM CDT for Moniteau County, Missouri. It was in force for 103 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 26, 2021, 7:51 PM CDT (00:51 UTC)
- Expired
- Aug 26, 2021, 9:34 PM CDT
- In force
- 103 min
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Moniteau County, MO
The radar
The Pleasant Hill radar (KEAX), 154 km from the middle of the area, began a volume at 00:54 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 26, 8:30 PM CDT | HEAVY RAIN 1.4 | California, MO | FELL IN THE PAST HOUR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.9 hours before the alert went out and 236 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
- 824 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 2066 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
601
WGUS53 KLSX 270051
FFWLSX
MOC135-270500-
/O.NEW.KLSX.FF.W.0039.210827T0051Z-210827T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
751 PM CDT Thu Aug 26 2021
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Eastern Moniteau County in central Missouri...
* Until midnight CDT.
* At 751 PM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 4 inches of rain have fallen. 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 and automated gauges.
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...
California, Jamestown, Clarksburg, McGirk, Easley, Lupus, Kliever
and Sandy Hook.
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 3853 9246 3854 9256 3863 9269 3868 9266
3868 9262 3869 9262 3875 9259 3892 9250
3890 9247 3887 9248 3886 9246 3883 9244
3882 9242 3882 9239 3881 9238 3880 9238
3879 9238 3877 9241 3875 9241 3874 9240
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
191 follow-up statement
974
WGUS73 KLSX 270234
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
934 PM CDT Thu Aug 26 2021
MOC135-270244-
/O.CAN.KLSX.FF.W.0039.000000T0000Z-210827T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Moniteau MO-
934 PM CDT Thu Aug 26 2021
...FLASH FLOOD WARNING FOR EASTERN MONITEAU COUNTY HAS BEEN REPLACED
WITH A FLOOD ADVISORY...
The heavy rain has ended. Flash flooding is no longer expected to
pose a threat. Please continue to heed remaining road closures.
LAT...LON 3853 9246 3854 9256 3863 9269 3868 9266
3868 9262 3869 9262 3875 9259 3892 9250
3890 9247 3887 9248 3886 9246 3883 9244
3882 9242 3882 9239 3881 9238 3880 9238
3879 9238 3877 9241 3875 9241 3874 9240
$$
19The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 8:34 PM CDT | Areal Flood Advisory | LSX | Warren | 3 hr |
| Aug 26, 9:34 PM CDT | Areal Flood Advisory | LSX | Moniteau | 2 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.