Alert archive / Missouri / Flash Flood Warnings in 2024

Flash Flood Warning 9, NWS St. Louis, MO

May 8, 2024Jefferson County, Missouri

NWS St. Louis, MO issued this flash flood warning at May 8, 2024, 5:13 PM CDT for Jefferson County, Missouri. It was in force for 4 hr. 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: May 8, 2024, 5:13 PM CDT (22:13 UTC)
Expired: May 8, 2024, 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), 57 km from the middle of the area, began a volume at 22:16 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 8, 9:05 PM CDT	FLASH FLOOD	1 W Festus, MO	Multiple roads closed in Jefferson County including Harrison Lake Road along Joachim Creek.

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 275 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1972 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: -112 m²/s²
0-3 km storm-relative helicity: -56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

416 
WGUS53 KLSX 082213
FFWLSX
MOC099-090215-
/O.NEW.KLSX.FF.W.0009.240508T2213Z-240509T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
513 PM CDT Wed May 8 2024

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Central 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. Up to 1 inch of rain has 
  fallen. The expected rainfall rate is 1 to 2 inches in 2 hours. 
  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 indicated.

  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...
  Festus, De Soto, Pevely, Crystal City, Herculaneum, Hillsboro, 
  Horine, Victoria, Hematite, Mapaville, Morse Mill, Fletcher, 
  Oermann and Grubville.

This includes the following State Parks...
Sandy Creek Covered Bridge Historic Site and Gov. Dunklin's Grave 
Historic Site.

This includes Interstate 55 in Missouri between exits 174 and 180.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3809 9068 3820 9078 3831 9076 3832 9037
      3828 9037 3824 9036 3820 9034 3810 9056
      3809 9065

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 2 HOURS

$$

Gosselin

1 follow-up statement

716 
WGUS73 KLSX 090210
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
910 PM CDT Wed May 8 2024

MOC099-090220-
/O.EXP.KLSX.FF.W.0009.000000T0000Z-240509T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson MO-
910 PM CDT Wed May 8 2024

...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM CDT THIS EVENING FOR 
CENTRAL JEFFERSON COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

&&

LAT...LON 3809 9068 3820 9078 3831 9076 3832 9037
      3828 9037 3824 9036 3820 9034 3810 9056
      3809 9065

$$

Gosselin

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 8, 3:01 AM CDT	Flood Watch	LSX	Cole, Crawford, Franklin, Gasconade, Iron, Jefferson and 9 more	19 hr
May 8, 9:13 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	47 min
May 8, 9:55 AM CDT	Severe Thunderstorm Warning	LSX	Cole, Osage	50 min
May 8, 10:25 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Gasconade, Osage	65 min
May 8, 10:49 AM CDT	Areal Flood Advisory	LSX	Cole, Moniteau, Osage	3 hr
May 8, 10:53 AM CDT	River Flood Warning	LSX	Cole, Osage	4 days
May 8, 10:58 AM CDT	Tornado Warning	LSX	Crawford, Franklin, Gasconade	47 min
May 8, 11:27 AM CDT	Areal Flood Advisory	LSX	Crawford, Franklin, Gasconade	8 min
May 8, 11:27 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Franklin, Jefferson	48 min
May 8, 11:35 AM CDT	Flash Flood Warning	LSX	Crawford, Franklin, Gasconade	3 hr
May 8, 11:35 AM CDT	Tornado Warning	LSX	Crawford, Franklin, Washington	40 min
May 8, 11:37 AM CDT	River Flood Warning	LSX	Cole	45 hr
May 8, 12:11 PM CDT	Tornado Warning	LSX	Franklin, Jefferson, Washington	49 min
May 8, 12:20 PM CDT	Areal Flood Advisory	LSX	Franklin, Jefferson, Saint Louis, Washington	28 min
May 8, 12:48 PM CDT	Flash Flood Warning	LSX	Franklin, Jefferson, Saint Louis, Washington	3 hr
May 8, 12:56 PM CDT	Tornado Warning	LSX	Jefferson, Sainte Genevieve	49 min
May 8, 1:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Jefferson, Sainte Genevieve, Saint Francois	47 min
May 8, 1:14 PM CDT	River Flood Warning	LSX	Osage	33 hr
May 8, 1:21 PM CDT	River Flood Warning	LSX	Crawford, Washington	33 hr
May 8, 1:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Saint Francois, Washington	61 min
May 8, 1:36 PM CDT	Tornado Warning	LSX	Sainte Genevieve, Saint Francois, Washington	39 min
May 8, 1:55 PM CDT	Tornado Warning	LSX	Sainte Genevieve	50 min
May 8, 2:00 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve	60 min
May 8, 2:27 PM CDT	Severe Thunderstorm Warning	LSX	Sainte Genevieve, Saint Francois	33 min
May 8, 2:44 PM CDT	Areal Flood Advisory	LSX	Sainte Genevieve, Saint Francois	3 hr
May 8, 3:15 PM CDT	Areal Flood Advisory	LSX	Sainte Genevieve, Saint Francois	3 hr
May 8, 4:24 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Crawford	55 min
May 8, 4:35 PM CDT	Severe Thunderstorm Warning	LSX	Crawford, Franklin, Washington	40 min
May 8, 4:42 PM CDT	River Flood Warning	LSX	Jefferson	61 hr
May 8, 4:54 PM CDT	Severe Thunderstorm Warning	LSX	Washington	51 min
May 8, 5:00 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson	29 min
May 8, 5:30 PM CDT	Severe Thunderstorm Warning	LSX	Saint Francois, Washington	45 min
May 8, 5:34 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds	41 min
May 8, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve	40 min
May 8, 6:05 PM CDT	Areal Flood Advisory	LSX	Crawford, Jefferson, Sainte Genevieve, Saint Francois, Washington	3 hr
May 8, 6:08 PM CDT	Tornado Warning	LSX	Sainte Genevieve	52 min
May 8, 6:12 PM CDT	Severe Thunderstorm Warning	LSX	Iron, Sainte Genevieve, Saint Francois, Washington	63 min

Nearby

Flash Flood Warnings in Missouri, 2024 Every flash flood warning in 2024

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.