Alert archive / Missouri / Flash Flood Warnings in 2020
Flash Flood Warning 9, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at May 24, 2020, 5:13 PM CDT for Jefferson County, Missouri. It was in force for 4 hr. 2 reports 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
- May 24, 2020, 5:13 PM CDT (22:13 UTC)
- Expired
- May 24, 2020, 9:15 PM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Jefferson County, MO
The radar
The St Louis radar (KLSX), 62 km from the middle of the area, began a volume at 22:17 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 |
|---|---|---|---|
| May 24, 6:06 PM CDT | FLASH FLOOD | 1 Ne Victoria, MO | CREEK OUT OF ITS BANKS AND OVER A ROADWAY NEAR ARGONNE ROAD AND HIGHWAY P. |
| May 24, 6:25 PM CDT | FLASH FLOOD | Victoria, MO | JOACHIM CREEK OUT OF ITS BANKS AND OVER HIGHWAY P. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.2 hours before the alert went out and 281 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
- 489 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 1250 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
205
WGUS53 KLSX 242213
FFWLSX
MOC099-250215-
/O.NEW.KLSX.FF.W.0009.200524T2213Z-200525T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
513 PM CDT Sun May 24 2020
The National Weather Service in St Louis has issued a
* Flash Flood Warning for...
Southern Jefferson County in east central Missouri...
* Until 915 PM CDT.
* At 513 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flooding include...
Festus, De Soto, Pevely, Crystal City, Herculaneum, Hillsboro,
Olympian Village, Horine, Hematite, Victoria, Fletcher and
Mapaville.
Additional rainfall amounts of 1-2 inches are possible in the warned
area.
This also includes Gov. Dunklin's Grave Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 3809 9065 3810 9066 3809 9067 3809 9068
3810 9068 3820 9078 3821 9078 3832 9038
3824 9036 3822 9035 3813 9033 3808 9066
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR
$$
Gosselin1 follow-up statement
634
WGUS73 KLSX 242310
FFSLSX
Flash Flood Statement
National Weather Service St Louis MO
610 PM CDT Sun May 24 2020
MOC099-250215-
/O.CON.KLSX.FF.W.0009.000000T0000Z-200525T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson MO-
610 PM CDT Sun May 24 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR
SOUTHERN JEFFERSON COUNTY...
At 609 PM CDT, the public reported thunderstorms producing
flash flooding on Joachim Creek near Argonne Road and Highway P.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Public.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other drainage
and low lying areas.
Some locations that will experience flooding include...
Festus, De Soto, Pevely, Crystal City, Herculaneum, Hillsboro,
Olympian Village, Horine, Hematite, Victoria, Fletcher and Mapaville.
This also includes Gov. Dunklin's Grave Historic Site.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 3809 9065 3810 9066 3809 9067 3809 9068
3810 9068 3820 9078 3821 9078 3832 9038
3824 9036 3822 9035 3813 9033 3808 9066
FLASH FLOOD...OBSERVED
$$
GosselinThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 3:54 PM CDT | Severe Thunderstorm Warning | LSX | Knox | 51 min |
| May 24, 4:08 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis | 52 min |
| May 24, 4:31 PM CDT | Severe Thunderstorm Warning | LSX | Franklin, Saint Charles, Warren | 30 min |
| May 24, 5:18 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 42 min |
| May 24, 5:25 PM CDT | Areal Flood Advisory | LSX | Knox, Lewis | 3 hr |
| May 24, 5:44 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 46 min |
| May 24, 6:22 PM CDT | Flash Flood Warning | LSX | Pike, Ralls | 5 hr |
| May 24, 6:55 PM CDT | Severe Thunderstorm Warning | LSX | Pike, Ralls | 22 min |
Nearby
Flash Flood Warnings in Missouri, 2020Every flash flood warning in 2020
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.