Alert archive / Missouri / Flash Flood Warnings in 2021

Flash Flood Warning 12, NWS St. Louis, MO

June 25, 2021Audrain County, Boone County, Callaway County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jun 25, 2021, 6:43 PM CDT for Audrain County, Boone County, Callaway County, Missouri. It was in force for 6 hr. 13 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: Jun 25, 2021, 6:43 PM CDT (23:43 UTC)
Expired: Jun 26, 2021, 12:45 AM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Audrain County, MO, Boone County, MO, Callaway County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 23:42 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
Jun 25, 6:47 PM CDT	FLASH FLOOD	1 Sw Hallsville, MO	FLOOD WATERS OVER THE ROADWAY IN MULTIPLE PLACES.
Jun 25, 6:48 PM CDT	FLASH FLOOD	6 E Columbia, MO	WATER OVER THE ROADWAY.
Jun 25, 6:50 PM CDT	FLASH FLOOD	3 W Hallsville, MO	FAST-MOVING WATER OVER THE ROADWAY.
Jun 25, 6:55 PM CDT	FLASH FLOOD	4 E Columbia, MO	ROAD CLOSED DUE TO FLOOD WATER OVER THE ROADWAY.
Jun 25, 7:02 PM CDT	FLASH FLOOD	7 Ese Harrisburg, MO	FLOOD WATERS OVER ROADWAY.
Jun 25, 7:11 PM CDT	FLASH FLOOD	7 Ne Midway, MO	MOVING WATER OVER ROADWAY AT BRIDGE CROSSING.
Jun 25, 7:17 PM CDT	FLASH FLOOD	3 Ne Murry, MO	WATER RESCUE DUE TO RAPID FLOOD WATERS.
Jun 25, 7:21 PM CDT	HEAVY RAIN 7.16	2 W Columbia, MO	TOTAL RAINFALL BETWEEN MIDNIGHT AND 7 PM.
Jun 25, 7:31 PM CDT	FLASH FLOOD	Mexico, MO	FLOOD WATERS OVER THE ROADWAYS IN MULTIPLE LOCATIONS.
Jun 25, 8:37 PM CDT	FLASH FLOOD	5 Ese Harrisburg, MO	ROADWAY WASHED OUT FROM FLOOD WATERS. SECTION OF ROADWAY HAS COLLAPSED AND IS IMPASSABLE.
Jun 25, 11:54 PM CDT	FLASH FLOOD	7 N Columbia, MO	VEHICLE TRAPPED IN FLOOD WATERS.
Jun 26, 12:05 AM CDT	FLASH FLOOD	2 Ne Easley, MO	WATER RESCUE WITH TWO OCCUPANTS IN VEHICLE TRAPPED IN FLOOD WATERS.
Jun 26, 12:10 AM CDT	FLASH FLOOD	7 N Columbia, MO	WATER RESCUE OF OCCUPANTS FROM TWO VEHICLES ON CREEKLAND DR NEAR CALVERT HILL.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.7 hours before the alert went out and 263 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: 1974 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 268 m²/s²
0-3 km storm-relative helicity: 248 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 10.8

Open this sounding in Storm Lab

The text

As transmitted.

227 
WGUS53 KLSX 252343
FFWLSX
MOC007-019-027-260545-
/O.NEW.KLSX.FF.W.0012.210625T2343Z-210626T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
643 PM CDT Fri Jun 25 2021

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Boone County in central Missouri...
  Southwestern Audrain County in central Missouri...
  Northwestern Callaway County in central Missouri...

* Until 1245 AM CDT Saturday.

* At 642 PM CDT, emergency management reported thunderstorms
  producing heavy rain across the warned area. Up to two inches of
  rain have already fallen. Flash flooding is ongoing or expected to
  begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management.

  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...
  Columbia, Mexico, Centralia, Columbia Regional Airport, Hallsville,
  Auxvasse, Sturgeon, Rocheport, Murry, Midway, Harrisburg, Kingdom
  City, Vandiver, McBaine, Carrington, Hatton and Thompson.

This also includes Rock Bridge State Park, Finger Lakes State Park,
and Jewell Cemetery Historic Site.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3899 9256 3925 9243 3925 9231 3923 9180
      3904 9186 3879 9205 3881 9238 3882 9239
      3882 9242 3883 9244 3886 9245 3888 9248
      3891 9248 3898 9257

FLASH FLOOD...OBSERVED

$$

BSH

2 follow-up statements

269 
WGUS73 KLSX 252358
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
658 PM CDT Fri Jun 25 2021

MOC007-019-027-260545-
/O.CON.KLSX.FF.W.0012.000000T0000Z-210626T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone MO-Audrain MO-Callaway MO-
658 PM CDT Fri Jun 25 2021

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
SATURDAY FOR BOONE...SOUTHWESTERN AUDRAIN AND NORTHWESTERN CALLAWAY
COUNTIES...

At 655 PM CDT, emergency management reported floodwater over several 
roads as well as some instances of rapidly moving water. Up to three 
inches of rain have already fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Life threatening flash flooding. Heavy rain producing flash 
         flooding.

SOURCE...Emergency management.

IMPACT...Life threatening flash flooding of creeks and streams, 
         urban areas, highways, streets and underpasses.

Some locations that will experience flooding include...
Columbia, Mexico, Centralia, Columbia Regional Airport, Hallsville,
Auxvasse, Sturgeon, Rocheport, Murry, Midway, Harrisburg, Kingdom
City, Vandiver, McBaine, Carrington, Hatton and Thompson.

This also includes Rock Bridge State Park, Finger Lakes State Park,
and Jewell Cemetery Historic Site.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3899 9256 3925 9243 3925 9231 3923 9180
      3904 9186 3879 9205 3881 9238 3882 9239
      3882 9242 3883 9244 3886 9245 3888 9248
      3891 9248 3898 9257

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

BSH

512 
WGUS73 KLSX 260415
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
1115 PM CDT Fri Jun 25 2021

MOC007-019-027-260545-
/O.CON.KLSX.FF.W.0012.000000T0000Z-210626T0545Z/
/00000.U.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Audrain MO-Boone MO-Callaway MO-
1115 PM CDT Fri Jun 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT SATURDAY 
FOR SOUTHWESTERN AUDRAIN, BOONE AND NORTHWESTERN CALLAWAY COUNTIES...

At 1115 PM CDT, Local law enforcement is reporting that Business 54 
is closed on the east side of Mexico and numerous county roads are 
closed in the warned area because of the heavy rain that has fallen 
tonight.  Additional thunderstorms are expected to move into the 
area tonight which may produce another 1 to 2 inches of rain.

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.

This includes the following State Parks...
Rock Bridge State Park, Finger Lakes State Park and Jewell Cemetery 
Historic Site.

This includes the following highways...
	Interstate 70 in Missouri between exits 115 and 148.

LAT...LON 3899 9256 3925 9243 3925 9231 3923 9180
      3904 9186 3879 9205 3881 9238 3882 9239
      3882 9242 3883 9244 3886 9245 3888 9248
      3891 9248 3898 9257

FLASH FLOOD...RADAR INDICATED

$$

Britt

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 10:57 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Shelby	48 min
Jun 24, 11:03 PM CDT	Tornado Warning	LSX	Monroe, Shelby	42 min
Jun 24, 11:29 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Lewis, Marion, Monroe, Pike, Ralls and 1 more	46 min
Jun 24, 11:32 PM CDT	Tornado Warning	LSX	Lewis	28 min
Jun 24, 11:35 PM CDT	Tornado Warning	LSX	Audrain, Monroe, Ralls	40 min
Jun 24, 11:40 PM CDT	Tornado Warning	LSX	Marion, Monroe, Ralls, Shelby	38 min
Jun 25, 12:09 AM CDT	Tornado Warning	LSX	Audrain, Pike, Ralls	51 min
Jun 25, 12:17 AM CDT	Severe Thunderstorm Warning	LSX	Audrain, Lincoln, Montgomery, Pike, Ralls	43 min
Jun 25, 12:57 AM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Pike	48 min
Jun 25, 1:27 AM CDT	River Flood Warning	LSX	Boone	33 hr
Jun 25, 1:54 AM CDT	Areal Flood Advisory	LSX	Montgomery	3 hr
Jun 25, 2:21 AM CDT	Areal Flood Advisory	LSX	Audrain, Boone, Callaway	106 min
Jun 25, 3:07 AM CDT	Areal Flood Advisory	LSX	Boone, Callaway, Cole, Moniteau	82 min
Jun 25, 3:34 AM CDT	Flash Flood Warning	LSX	Boone	6 hr
Jun 25, 4:04 AM CDT	Flash Flood Warning	LSX	Audrain, Boone, Callaway	6 hr
Jun 25, 4:26 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	6 hr
Jun 25, 4:28 AM CDT	Flash Flood Warning	LSX	Callaway, Lincoln, Montgomery, Osage, Warren	6 hr
Jun 25, 7:48 AM CDT	River Flood Warning	LSX	Lincoln	62 hr
Jun 25, 8:25 AM CDT	Areal Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau	9 hr
Jun 25, 10:06 AM CDT	River Flood Warning	LSX	Franklin, Warren	9 days
Jun 25, 10:06 AM CDT	River Flood Warning	LSX	Saint Charles, Saint Louis	21 days
Jun 25, 10:06 AM CDT	River Flood Warning	LSX	Boone, Callaway, Cole, Moniteau	8 days
Jun 25, 10:06 AM CDT	River Flood Warning	LSX	Callaway, Osage	21 days
Jun 25, 10:06 AM CDT	River Flood Warning	LSX	Gasconade, Montgomery	10 days
Jun 25, 4:59 PM CDT	Severe Thunderstorm Warning	LSX	Callaway, Osage	20 min
Jun 25, 5:01 PM CDT	Severe Thunderstorm Warning	LSX	Boone, Moniteau	44 min
Jun 25, 5:05 PM CDT	River Flood Warning	LSX	Cole, Osage	9 days
Jun 25, 5:42 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	22 min
Jun 25, 6:07 PM CDT	River Flood Warning	LSX	Lincoln	3 days
Jun 25, 6:36 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Saint Charles, Warren	39 min
Jun 25, 6:48 PM CDT	Severe Thunderstorm Warning	LSX	Lincoln, Montgomery, Warren	42 min
Jun 25, 6:55 PM CDT	Severe Thunderstorm Warning	LSX	Audrain, Boone, Callaway	19 min

Nearby

Flash Flood Warnings in Missouri, 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.