Flash Flood Warning 44, NWS St. Louis, MO

843 
WGUS73 KLSX 042345
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
645 PM CDT Sat Jul 4 2026

MOC189-510-050030-
/O.CON.KLSX.FF.W.0044.000000T0000Z-260705T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saint Louis MO-Saint Louis City MO-
645 PM CDT Sat Jul 4 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT THIS
EVENING FOR SOUTHWESTERN SAINT LOUIS COUNTY AND THE SAINT LOUIS
CITY...

At 645 PM CDT, Doppler radar indicates thunderstorms produced heavy
rain over portions of St. Louis County and City. Between 1 and 3
inches of rain have fallen. Several stream gages in the warned area
are showing significant rises of several feet. Flooding impacts will
continue, but no additional rainfall is expected. 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...
  Kirkwood, Des Peres, Town and Country, Manchester, Sunset Hills,
  Ladue, Crestwood, Creve Coeur, Webster Groves, Ballwin, Brentwood,
  Chesterfield, Richmond Heights, Clayton, University City,
  Ellisville, St. Louis, Maryland Heights, Wildwood and Eureka.

This includes the following State Parks...
Babler Memorial State Park, Scott Joplin Historic Site, Route 66
State Park and Castlewood State Park.

This includes Interstate 44 in Missouri between exits 264 and 277.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3848 9066 3862 9073 3864 9073 3865 9071
      3869 9066 3868 9055 3870 9053 3871 9053
      3868 9046 3867 9019 3864 9018 3859 9020
      3858 9022 3853 9026 3850 9041 3850 9059
      3847 9062 3849 9064

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

015 
WGUS53 KLSX 050021
FFWLSX
MOC189-510-050230-
/O.EXT.KLSX.FF.W.0044.000000T0000Z-260705T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
721 PM CDT Sat Jul 4 2026

The National Weather Service in St Louis has extended the

* Flash Flood Warning for...
  Southwestern Saint Louis County in east central Missouri...
  Saint Louis City in east central Missouri...

* Until 930 PM CDT.

* At 721 PM CDT, Doppler radar indicates thunderstorms produced heavy
  rain over portions of St. Louis County and City. Between 1 and 3
  inches of rain have fallen. Several stream gages in the warned area
  are showing significant rises of several feet. Flooding impacts
  will continue, but no additional rainfall is expected. 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...
  Kirkwood, Des Peres, Town and Country, Manchester, Sunset Hills,
  Ladue, Crestwood, Creve Coeur, Webster Groves, Ballwin, Brentwood,
  Chesterfield, Richmond Heights, Clayton, University City,
  Ellisville, St. Louis, Maryland Heights, Wildwood and Eureka.

This includes the following State Parks...
Babler Memorial State Park, Scott Joplin Historic Site, Route 66
State Park and Castlewood State Park.

This includes Interstate 44 in Missouri between exits 264 and 277.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3848 9066 3862 9073 3864 9073 3865 9071
      3869 9066 3868 9055 3870 9053 3871 9053
      3868 9046 3867 9019 3864 9018 3859 9020
      3858 9022 3853 9026 3850 9041 3850 9059
      3847 9062 3849 9064

FLASH FLOOD...RADAR INDICATED

$$

742 
WGUS73 KLSX 050221
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
921 PM CDT Sat Jul 4 2026

MOC189-510-050231-
/O.EXP.KLSX.FF.W.0044.000000T0000Z-260705T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Saint Louis MO-Saint Louis City MO-
921 PM CDT Sat Jul 4 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM CDT THIS EVENING FOR
SOUTHWESTERN SAINT LOUIS COUNTY AND THE SAINT LOUIS CITY...

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

&&

LAT...LON 3848 9066 3862 9073 3864 9073 3865 9071
      3869 9066 3868 9055 3870 9053 3871 9053
      3868 9046 3867 9019 3864 9018 3859 9020
      3858 9022 3853 9026 3850 9041 3850 9059
      3847 9062 3849 9064

$$

Maples

Area Forecast Discussion
National Weather Service Saint Louis MO
400 PM CDT Sat Jul 4 2026

.KEY MESSAGES...

- The threat for scattered showers and thunderstorms will continue through
  tonight. A few storms will be capable of damaging wind gusts
  for areas south of I-70 through early evening.

- Temperatures remain warm, but below dangerous heat levels
  through next week.

&&

.SHORT TERM...  (Through Late Sunday Night)
Issued at 359 PM CDT Sat Jul 4 2026

A potent MCS is ongoing across portions of eastern Missouri, and is
tracking along an outflow boundary from convection last night. While
deep-layer shear is a meager ~20 kts, MLCAPE is at 3,000 J/kg per
recent SPC mesoanalysis. With the MCS having a well-established cold
pool, the threat for strong to severe storms will continue through
early this evening east of the MCS for areas mainly south of I-70.

This MCS is scrubbing the atmosphere over much of the area of
instability, leaving a mostly stable environment in place ahead of a
cold front slowly sinking toward the area later this evening and
tonight. While I am keeping a low threat for isolated to scattered
showers and thunderstorms south of the front over much of the CWA
through tonight, a majority of locations will remain rain free once
the MCS clears the CWA to the southeast this evening.

Tomorrow, the front/effective boundary is expected to be south of
the CWA while a series of disturbances rotate around the base of
subtle trough over the Midwest. The positioning of the boundary will
mark the end of our recent stretch of heat, with most locations
topping out below 90 degrees. However, there will still be enough
warmth and moisture to produce SBCAPE around 1,500 J/kg, enough to
combine with the disturbances to produce a low chance (30%) for
isolated to scattered showers and thunderstorms through the day.
With this amount of instability and deep-layer shear forecast to be
around 20 kts, organized severe thunderstorms are not expected.

Elmore

&&

.LONG TERM...  (Monday through Next Saturday)
Issued at 359 PM CDT Sat Jul 4 2026

The axis of the upper-level ridge will be centered over the western
U.S. at the start of the workweek, with a weak trough/cutoff over
the Ohio Valley per guidance consensus. This will support the chance
for scattered showers and thunderstorms across portions of the area
during the afternoon. Cutoffs are notorious for being poorly
resolved by guidance, so while the majority of guidance has this
feature weakening and/or drifting eastward through Tuesday, there is
a low chance that it may still be close enough and strong enough to
produce another round of scattered convection on Tuesday.

Tuesday through Thursday, the upper-level ridge broadens across the
CONUS, but begins to deamplify as a shortwave moves through the
Northern Plains and Upper Midwest. For the Middle Mississippi
Valley, this will lead to a subtle upward trend in temperatures
Tuesday through Thursday. Through this stretch, a majority of
guidance is cooler than the period of heat the area has been
experiencing lately, with temperatures being closer to
climatological normals for highs (around 90 degrees).

The aforementioned shortwave pushes a cold front through the region
roughly late Thursday into Friday. A majority of guidance has upper-
level flow becoming increasingly northwesterly at this point in the
period, but to what degree and how quickly vary. This will have
impacts on the front's progression, with a more progressive front
favoring a drier CWA late Friday, while a slower front will linger
rain chances into at least late Friday or Saturday morning. With
most global ensemble members showing some flavor of the latter, the
current forecast lingers rain chances into Saturday morning. At the
very least, ensemble membership shows a drop in temperatures with
the FROPA as we head into next weekend, with a 25% chance of highs
running just under seasonal normals.

Elmore

&&

.AVIATION...  (For the 18z TAFs through 18z Sunday Afternoon)
Issued at 1255 PM CDT Sat Jul 4 2026

There is a threat for multiple rounds of thunderstorms at all of
the local terminals through the TAF period. Isolated to scattered
showers and storms are in the broader vicinity of all local
terminals except for KUIN, with these posing a threat for early in
the period. Our attention then turns to a cluster of storms moving
eastward out of western Missouri and a cold front sinking
southward into the region late this afternoon and evening.
Both will serve as a focus for a greater threat of thunderstorms
capable of erratic, gusty winds and heavy rainfall. Confidence is
low on the timing of these stronger storms, so chances have been
left to PROB30 groups for now. Once confidence increases, TEMPO or
prevailing groups will be needed for some of the terminals. A lull
in rain chances is expected tonight, with a low chance for showers
and thunderstorms again late in the period tomorrow.

Elmore

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...Heat Advisory until 8 PM CDT this evening for Audrain MO-
     Crawford MO-Iron MO-Knox MO-Lewis MO-Lincoln MO-Madison MO-
     Marion MO-Monroe MO-Pike MO-Ralls MO-Reynolds MO-Saint
     Francois MO-Shelby MO-Washington MO.

     Extreme Heat Warning until 8 PM CDT this evening for Boone MO-
     Callaway MO-Cole MO-Franklin MO-Gasconade MO-Jefferson MO-
     Moniteau MO-Montgomery MO-Osage MO-Saint Charles MO-Saint
     Louis City MO-Saint Louis MO-Sainte Genevieve MO-Warren MO.

IL...Heat Advisory until 8 PM CDT this evening for Adams IL-Bond IL-
     Brown IL-Calhoun IL-Fayette IL-Greene IL-Jersey IL-Macoupin
     IL-Marion IL-Montgomery IL-Pike IL.

     Extreme Heat Warning until 8 PM CDT this evening for Clinton IL-
     Madison IL-Monroe IL-Randolph IL-Saint Clair IL-Washington
     IL.

&&

WFO LSX

Preliminary Local Storm Report
National Weather Service St Louis MO
217 PM CDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0213 PM     Tstm Wnd Dmg     1 W California          38.63N 92.58W
07/04/2026                   Moniteau           MO   Trained Spotter

            6 inch tree limb snapped on west side of
            California with the gust front passage.

&&

AE

Preliminary Local Storm Report
National Weather Service St Louis MO
337 PM CDT Sat Jul 4 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0315 PM     Tstm Wnd Dmg     2 E Weldon Spring       38.72N 90.60W
07/04/2026                   St. Charles        MO   Public

            Power lines down.

&&

BRC