Alert archive / Missouri / Flash Flood Warnings in 2021

Flash Flood Warning 23, NWS St. Louis, MO

July 1, 20214 counties in Missouri

NWS St. Louis, MO issued this flash flood warning at Jul 1, 2021, 6:32 AM CDT for 4 counties in Missouri. It was in force for 3 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: Jul 1, 2021, 6:32 AM CDT (11:32 UTC)
Expired: Jul 1, 2021, 9:15 AM CDT
In force: 3 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Boone County, MO, Callaway County, MO, Cole County, MO, Moniteau County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 11:31 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 1, 7:00 AM CDT	FLASH FLOOD	2 Nw Ashland, MO	CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 2 NW ASHLAND. OBSERVER LISTED SEVERAL ROADWAYS CLOSED AND IMPASSIBLE DUE TO FLOODING. ALSO REPORTED THAT LOCAL CREEKS WERE OVERFLOWING THEIR BANKS ONTO THE ROADS. 3.13IN OF RAIN IN 2 HOURS, WITH 1.9IN FALLING IN ABOUT

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 00:00Z, 11.5 hours before the alert went out and 252 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: 113 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 836 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

251 
WGUS53 KLSX 011132
FFWLSX
MOC019-027-051-135-011430-
/O.NEW.KLSX.FF.W.0023.210701T1132Z-210701T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
632 AM CDT Thu Jul 1 2021

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Central Boone County in central Missouri...
  Southwestern Callaway County in central Missouri...
  North Central Cole County in central Missouri...
  Northeastern Moniteau County in central Missouri...

* Until 930 AM CDT.

* At 632 AM CDT, emergency management reported thunderstorms 
  producing heavy rain across the warned area. Between 1.5 and 2.5 
  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...Emergency management 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...
  Columbia, Ashland, Holts Summit, Columbia Regional Airport, New 
  Bloomfield, Lake Mykee Town, Rocheport, Easley, Midway, Lake 
  Mykee, Marion, Hartsburg, Lupus, McBaine, Wilton, Sandy Hook, 
  Guthrie and Carrington.

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

This includes the following highways...
	Interstate 70 in Missouri between exits 115 and 131.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3911 9250 3890 9215 3881 9202 3865 9200
      3864 9226 3868 9236 3874 9240 3883 9254
      3892 9250 3898 9257 3899 9256

FLASH FLOOD...OBSERVED

$$

BRC

1 follow-up statement

998 
WGUS73 KLSX 011415
FFSLSX

Flash Flood Statement
National Weather Service St Louis MO
915 AM CDT Thu Jul 1 2021

MOC019-027-051-135-011425-
/O.CAN.KLSX.FF.W.0023.000000T0000Z-210701T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boone MO-Callaway MO-Cole MO-Moniteau MO-
915 AM CDT Thu Jul 1 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL BOONE, SOUTHWESTERN 
CALLAWAY, NORTH CENTRAL COLE AND NORTHEASTERN MONITEAU COUNTIES...

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

A Flash Flood Watch remains in effect until 100 PM CDT for Portions 
of central and east central Missouri.

LAT...LON 3911 9250 3890 9215 3881 9202 3865 9200
      3864 9226 3868 9236 3874 9240 3883 9254
      3892 9250 3898 9257 3899 9256

$$

Fuchs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:41 PM CDT	Areal Flood Advisory	LSX	Saint Charles	3 hr
Jun 30, 10:44 PM CDT	Areal Flood Advisory	LSX	Monroe, Ralls	7 hr
Jul 1, 12:12 AM CDT	Areal Flood Advisory	LSX	Marion, Shelby	23 min
Jul 1, 12:35 AM CDT	Flash Flood Warning	LSX	Marion, Shelby	3 hr
Jul 1, 2:57 AM CDT	Areal Flood Advisory	LSX	Marion, Monroe, Shelby	3 hr
Jul 1, 3:21 AM CDT	Areal Flood Advisory	LSX	Marion, Shelby	2 hr
Jul 1, 5:16 AM CDT	Areal Flood Advisory	LSX	Callaway, Montgomery, Warren	3 hr
Jul 1, 5:51 AM CDT	Areal Flood Advisory	LSX	Saint Charles	3 hr
Jul 1, 6:04 AM CDT	Areal Flood Advisory	LSX	Boone, Callaway, Cole, Moniteau	28 min
Jul 1, 6:59 AM CDT	River Flood Warning	LSX	Monroe	37 hr
Jul 1, 8:21 AM CDT	River Flood Warning	LSX	Cole	32 hr
Jul 1, 11:54 AM CDT	River Flood Warning	LSX	Lincoln	27 hr

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.