Alert archive / Missouri / Flash Flood Warnings in 2018

Flash Flood Warning 3, NWS St. Louis, MO

March 26, 2018Audrain County, Pike County, Ralls County, Missouri

NWS St. Louis, MO issued this flash flood warning at Mar 26, 2018, 1:50 PM CDT for Audrain County, Pike County, Ralls County, Missouri. It was in force for 6 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: Mar 26, 2018, 1:50 PM CDT (18:50 UTC)
Expired: Mar 26, 2018, 7:45 PM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Audrain County, MO, Pike County, MO, Ralls County, MO

The radar

The St Louis radar (KLSX), 95 km from the middle of the area, began a volume at 18:52 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
Mar 26, 2:57 PM CDT	FLOOD	4 Ese Center, MO	WATER OF UNKNOWN DEPTH RUNNING OVER HIGHWAY F AND SEELY LN. ALSO WATER OVER THE ROADWAY AT HWY F AT HWY AB.

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 12:00Z, 6.8 hours before the alert went out and 243 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1504 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

273 
WGUS53 KLSX 261850
FFWLSX
MOC007-163-173-270045-
/O.NEW.KLSX.FF.W.0003.180326T1850Z-180327T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
150 PM CDT MON MAR 26 2018

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Ralls County in northeastern Missouri...
  Northeastern Audrain County in central Missouri...
  Pike County in northeastern Missouri...

* Until 745 PM CDT.

* At 149 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to three inches of rain has 
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Bowling Green, Vandalia, Louisiana, New London, Perry, Laddonia,
  Center, Frankford, Farber, Curryville, Spaulding, Tarrants,
  Spencerburg, New Hartford, St. Clement, The Landing, Cyrene, Ashley
  and Ashburn.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3961 9120 3955 9116 3941 9102 3922 9113
      3923 9118 3915 9118 3915 9172 3962 9172
      3963 9124

$$

Byrd

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 26, 7:45 AM CDT	Special Weather Statement	LSX	Cole	30 min
Mar 26, 8:29 AM CDT	Severe Thunderstorm Warning	LSX	Callaway	24 min
Mar 26, 9:18 AM CDT	Special Weather Statement	LSX	Moniteau	42 min
Mar 26, 11:48 AM CDT	Special Weather Statement	LSX	Monroe	42 min
Mar 26, 12:33 PM CDT	Areal Flood Advisory	LSX	Monroe	3 hr
Mar 26, 1:02 PM CDT	Flash Flood Warning	LSX	Audrain, Monroe	6 hr
Mar 26, 2:39 PM CDT	River Flood Warning	LSX	Monroe	4 days

Nearby

Flash Flood Warnings in Missouri, 2018 Every flash flood warning in 2018

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.