Alert archive / Missouri / Flash Flood Warnings in 2023

Flash Flood Warning 2, NWS St. Louis, MO

April 15, 2023Franklin County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 15, 2023, 6:13 PM CDT for Franklin 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: Apr 15, 2023, 6:13 PM CDT (23:13 UTC)
Expired: Apr 15, 2023, 10:15 PM CDT
In force: 4 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Franklin County, MO

The radar

The St Louis radar (KLSX), 52 km from the middle of the area, began a volume at 23:14 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

Springfield, MO (KSGF), launched 12:00Z, 11.2 hours before the alert went out and 290 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: 382 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1195 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

450 
WGUS53 KLSX 152313
FFWLSX
MOC071-160315-
/O.NEW.KLSX.FF.W.0002.230415T2313Z-230416T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
613 PM CDT Sat Apr 15 2023

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Southeastern Franklin County in east central Missouri...

* Until 1015 PM CDT.

* At 613 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts up to 1 inch 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...
  Sullivan, Pacific, St. Clair, Parkway, Miramiguoa Park, Lonedell, 
  Piney Park, Moselle, Stanton, Robertsville and Catawissa.

This includes the following State Parks...
	Robertsville State Park and Meramec State Park.

This includes the following highways...
	Interstate 44 in Missouri between exits 228 and 242.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3838 9111 3838 9100 3848 9074 3820 9078
      3820 9112 3824 9124 3832 9122

FLASH FLOOD...RADAR INDICATED

$$

Gosselin

2 follow-up statements

977 
WGUS73 KLSX 160034 RRA
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
734 PM CDT Sat Apr 15 2023

MOC071-160315-
/O.CON.KLSX.FF.W.0002.000000T0000Z-230416T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-
734 PM CDT Sat Apr 15 2023

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT THIS 
EVENING FOR SOUTHEASTERN FRANKLIN COUNTY...

At 734 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3 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...
  Sullivan, Pacific, St. Clair, Parkway, Miramiguoa Park, Lonedell, 
  Piney Park, Moselle, Stanton, Robertsville and Catawissa.

This includes the following State Parks...
	Robertsville State Park and Meramec State Park.

This includes the following highways...
	Interstate 44 in Missouri between exits 228 and 242.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3838 9111 3838 9100 3848 9074 3820 9078
      3820 9112 3824 9124 3832 9122

FLASH FLOOD...RADAR INDICATED

$$

Gosselin

589 
WGUS73 KLSX 160313
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
1013 PM CDT Sat Apr 15 2023

MOC071-160323-
/O.EXP.KLSX.FF.W.0002.000000T0000Z-230416T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Franklin MO-
1013 PM CDT Sat Apr 15 2023

...FLASH FLOOD WARNING WILL EXPIRE AT 1015 PM CDT THIS EVENING FOR 
SOUTHEASTERN FRANKLIN COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

LAT...LON 3838 9111 3838 9100 3848 9074 3820 9078
      3820 9112 3824 9124 3832 9122

$$

MRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 3:48 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Gasconade, Montgomery, Warren	42 min
Apr 15, 3:54 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Cole, Osage	51 min
Apr 15, 4:28 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Franklin, Gasconade, Montgomery, Warren	47 min
Apr 15, 4:36 PM CDT	Tornado Warning	LSX	Crawford, Franklin, Gasconade	39 min
Apr 15, 4:43 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	35 min
Apr 15, 4:55 PM CDT	Severe Thunderstorm Warning	LSX	Franklin	50 min
Apr 15, 4:58 PM CDT	Areal Flood Advisory	LSX	Osage	3 hr
Apr 15, 5:13 PM CDT	Severe Thunderstorm Warning Considerable damage threat	LSX	Crawford, Franklin, Gasconade, Washington	47 min
Apr 15, 5:28 PM CDT	Flash Flood Warning	LSX	Franklin	5 hr
Apr 15, 5:31 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Saint Louis	44 min
Apr 15, 5:47 PM CDT	Areal Flood Advisory	LSX	Franklin, Gasconade	3 hr
Apr 15, 5:52 PM CDT	Severe Thunderstorm Warning	LSX	Franklin, Jefferson, Saint Louis, Washington	38 min
Apr 15, 6:07 PM CDT	Tornado Warning	LSX	Franklin, Jefferson	35 min
Apr 15, 6:11 PM CDT	Severe Thunderstorm Warning	LSX	Saint Louis	49 min
Apr 15, 6:17 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	43 min
Apr 15, 6:19 PM CDT	Tornado Warning	LSX	Saint Louis, City of Saint Louis	41 min
Apr 15, 6:23 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Sainte Genevieve, Saint Francois	53 min
Apr 15, 6:27 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Saint Louis	52 min
Apr 15, 6:34 PM CDT	Tornado Warning	LSX	Jefferson	41 min
Apr 15, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Saint Charles, Saint Louis	39 min
Apr 15, 6:39 PM CDT	Flash Flood Warning	LSX	Jefferson, Saint Louis	4 hr
Apr 15, 6:39 PM CDT	Tornado Warning	LSX	Saint Louis, City of Saint Louis	51 min

Nearby

Flash Flood Warnings in Missouri, 2023 Every flash flood warning in 2023

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.