Alert archive / Missouri / Flash Flood Warnings in 2021

Flash Flood Warning 29, NWS St. Louis, MO

July 15, 2021Randolph County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 15, 2021, 11:22 PM CDT for Randolph County, Illinois; Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 5 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: Jul 15, 2021, 11:22 PM CDT (04:22 UTC)
Expired: Jul 16, 2021, 4:30 AM CDT
In force: 5 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Randolph County, IL, Saint Francois County, MO, Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 103 km from the middle of the area, began a volume at 04:25 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
Jul 16, 12:10 AM CDT	FLASH FLOOD	Farmington, MO	DISPATCH REPORTS SEVERAL ROADWAYS COVERED WITH WATER. THIS INCLUDES AT LEAST A HANDFUL OF ROADS THAT DO NOT TYPICALLY FLOOD. THE WORST OF THE FLOODING IS IN AND AROUND FARMINGTON.
Jul 16, 12:52 AM CDT	FLASH FLOOD	2 Wnw Steeleville, IL	ROADWAY BECOMING INUNDATED WITH WATER DUE TO DRAINAGE DITCH OVERFLOW HEADING WEST ON HWY 150, JUST WEST OF THE RT. 4 INTERCHANGE.

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 00:00Z, 4.4 hours before the alert went out and 285 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: 8 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

172 
WGUS53 KLSX 160422
FFWLSX
ILC157-MOC186-187-160830-
/O.NEW.KLSX.FF.W.0029.210716T0422Z-210716T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
1122 PM CDT Thu Jul 15 2021

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Randolph County in southwestern Illinois...
  Sainte Genevieve County in southeastern Missouri...
  Saint Francois County in southeastern Missouri...

* Until 330 AM CDT.

* At 1122 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 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...
  Farmington, Chester, Bonne Terre, Desloge, Ste. Genevieve, Sparta, 
  Bismarck, Leadwood, Bremen, Park Hills, Steeleville, Percy, 
  Coulterville, Iron Mountain Lake, Evansville, Bloomsdale, St. 
  Mary, Weingarten, Rocky Ridge and Coffman.

This includes the following State Parks...
St. Joe State Park, Hawn State Park, Felix Valle House State Park 
and Missouri Mines Historic Site.

This includes the following highways...
	Interstate 55 in Missouri between exits 141 and 157.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3791 9064 3822 8959 3796 8960 3790 8985
      3787 8990 3787 8994 3764 9043 3764 9065

FLASH FLOOD...RADAR INDICATED

$$

BSH

4 follow-up statements

547 
WGUS73 KLSX 160516
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
1216 AM CDT Fri Jul 16 2021

ILC157-MOC186-187-160830-
/O.CON.KLSX.FF.W.0029.000000T0000Z-210716T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Randolph IL-Sainte Genevieve MO-Saint Francois MO-
1216 AM CDT Fri Jul 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT EARLY THIS 
MORNING FOR RANDOLPH, SAINTE GENEVIEVE AND SAINT FRANCOIS COUNTIES...

At 1216 AM CDT, Dispatch reported several roadways covered in water, 
especially in and around the Farmington area. The thunderstorms 
responsible for this heavy rain have dropped between 1 and 3 inches 
of rain in the warned area. Flash flooding is ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  Farmington, Chester, Bonne Terre, Desloge, Ste. Genevieve, Sparta, 
  Bismarck, Leadwood, Bremen, Park Hills, Steeleville, Percy, 
  Coulterville, Iron Mountain Lake, Evansville, Bloomsdale, St. 
  Mary, Weingarten, Rocky Ridge and Coffman.

This includes the following State Parks...
St. Joe State Park, Hawn State Park, Felix Valle House State Park 
and Missouri Mines Historic Site.

This includes the following highways...
	Interstate 55 in Missouri between exits 141 and 157.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3791 9064 3822 8959 3796 8960 3790 8985
      3787 8990 3787 8994 3764 9043 3764 9065

FLASH FLOOD...OBSERVED

$$

BSH

244 
WGUS73 KLSX 160634
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
134 AM CDT Fri Jul 16 2021

ILC157-MOC186-187-160830-
/O.CON.KLSX.FF.W.0029.000000T0000Z-210716T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Randolph IL-Sainte Genevieve MO-Saint Francois MO-
134 AM CDT Fri Jul 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT EARLY THIS 
MORNING FOR RANDOLPH, SAINTE GENEVIEVE AND SAINT FRANCOIS COUNTIES...

At 134 AM CDT, local law enforcement reported thunderstorms 
producing heavy rain across Randolph County, IL with multiple 
reports of water over roadways throughout the county, including Hwy 
150. Between 2 and 5 inches of rain have fallen. Flash flooding is 
ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement reported.

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...
  Farmington, Chester, Bonne Terre, Desloge, Ste. Genevieve, Sparta, 
  Bismarck, Leadwood, Bremen, Park Hills, Steeleville, Percy, 
  Coulterville, Iron Mountain Lake, Evansville, Bloomsdale, St. 
  Mary, Weingarten, Rocky Ridge and Coffman.

This includes the following State Parks...
St. Joe State Park, Hawn State Park, Felix Valle House State Park 
and Missouri Mines Historic Site.

This includes the following highways...
	Interstate 55 in Missouri between exits 141 and 157.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3791 9064 3822 8959 3796 8960 3790 8985
      3787 8990 3787 8994 3764 9042 3764 9065

FLASH FLOOD...OBSERVED

$$

Maples

353 
WGUS53 KLSX 160810
FFWLSX
ILC157-MOC186-187-160930-
/O.EXT.KLSX.FF.W.0029.000000T0000Z-210716T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
310 AM CDT Fri Jul 16 2021

The National Weather Service in St Louis has extended the

* Flash Flood Warning for...
  Randolph County in southwestern Illinois...
  Sainte Genevieve County in southeastern Missouri...
  Saint Francois County in southeastern Missouri...

* Until 430 AM CDT.

* At 310 AM CDT, local law enforcement reported flooding continues 
  in some locations across the warned area. Radar estimates show 
  that two to five inches of rain have fallen across portions of the 
  warned area.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Law enforcement reported.

  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...
  Farmington, Chester, Bonne Terre, Desloge, Ste. Genevieve, Sparta, 
  Bismarck, Leadwood, Bremen, Park Hills, Steeleville, Percy, 
  Coulterville, Iron Mountain Lake, Evansville, Bloomsdale, St. 
  Mary, Weingarten, Rocky Ridge and Coffman.

This includes the following State Parks...
St. Joe State Park, Hawn State Park, Felix Valle House State Park 
and Missouri Mines Historic Site.

This includes the following highways...
	Interstate 55 in Missouri between exits 141 and 157.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3791 9064 3822 8959 3796 8960 3790 8985
      3787 8990 3787 8994 3764 9042 3764 9065

FLASH FLOOD...OBSERVED

$$

Maples

179 
WGUS73 KLSX 160929
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
429 AM CDT Fri Jul 16 2021

ILC157-MOC186-187-160939-
/O.EXP.KLSX.FF.W.0029.000000T0000Z-210716T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Randolph IL-Sainte Genevieve MO-Saint Francois MO-
429 AM CDT Fri Jul 16 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 430 AM CDT EARLY THIS MORNING 
FOR RANDOLPH, SAINTE GENEVIEVE AND SAINT FRANCOIS COUNTIES...

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

LAT...LON 3791 9064 3822 8959 3796 8960 3790 8985
      3787 8990 3787 8994 3764 9042 3764 9065

$$

Maples

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 9:10 PM CDT	Areal Flood Advisory	LSX	Madison, Monroe, Saint Clair	3 hr
Jul 15, 11:04 PM CDT	Areal Flood Advisory	LSX	Randolph	3 hr
Jul 16, 6:15 AM CDT	Areal Flood Advisory	LSX	Randolph, Saint Clair, Washington	4 hr
Jul 16, 1:19 PM CDT	Areal Flood Advisory	LSX	Washington	28 min
Jul 16, 1:41 PM CDT	Flash Flood Warning	LSX	Washington	6 hr
Jul 16, 2:57 PM CDT	Areal Flood Advisory	LSX	Marion	4 hr
Jul 16, 3:01 PM CDT	Areal Flood Advisory	LSX	Randolph	4 hr
Jul 16, 1:40 AM CDT	Areal Flood Advisory	LSX	Crawford, Jefferson, Sainte Genevieve, Saint Francois, Washington	3 hr
Jul 16, 2:18 AM CDT	Flash Flood Warning	LSX	Washington	6 hr

Nearby

Flash Flood Warnings in Missouri, 2021 Flash Flood Warnings in Illinois, 2021 Every 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.