Alert archive / Missouri / Flash Flood Warnings in 2019

Flash Flood Warning 7, NWS St. Louis, MO

May 26, 2019Knox County, Lewis County, Shelby County, Missouri

NWS St. Louis, MO issued this flash flood warning at May 26, 2019, 2:21 AM CDT for Knox County, Lewis County, Shelby County, Missouri. It was in force for 7 hr. 3 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: May 26, 2019, 2:21 AM CDT (07:21 UTC)
Expired: May 26, 2019, 9:15 AM CDT
In force: 7 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Knox County, MO, Lewis County, MO, Shelby County, MO

The radar

The St Louis radar (KLSX), 187 km from the middle of the area, began a volume at 07:21 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
May 26, 3:00 AM CDT	FLASH FLOOD	5 Nne Novelty, MO	SEVERAL HIGHWAYS WERE FLOODED DUE TO THE HEAVY RAINFALL INCLUDING HIGHWAY 151 BETWEEN NOVELTY AND EDINA AND HIGHWAY 156 WEST OF NOVELTY.
May 26, 3:15 AM CDT	FLASH FLOOD	5 Ssw Steffenville, MO	SEVERAL COUNTY ROADS WERE FLOODED DUE TO HEAVY RAINFALL INCLUDING HIGHWAY J JUST WEST OF INTERSECTION WITH HIGHWAY W, HIGHWAY W SOUTH OF INTERSECTION WITH HIGHWAY J, AND HIGHWAY K JUST WEST OF SHELBYVILLE.
May 26, 3:30 AM CDT	FLASH FLOOD	1 Wsw Ewing, MO	FLASH FLOODING HAS CAUSED HIGHWAY 156 TO BE CLOSED DUE TO THE HEAVY RAINFALL JUST WEST OF EWING.

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

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.4 hours before the alert went out and 207 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: 710 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1232 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.3

Open this sounding in Storm Lab

The text

As transmitted.

074 
WGUS53 KLSX 260721
FFWLSX
MOC103-111-205-261415-
/O.NEW.KLSX.FF.W.0007.190526T0721Z-190526T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service St Louis MO
221 AM CDT Sun May 26 2019

The National Weather Service in St Louis has issued a

* Flash Flood Warning for...
  Knox County in northeastern Missouri...
  Shelby County in northeastern Missouri...
  Lewis County in northeastern Missouri...

* Until 915 AM CDT Sunday.

* At 220 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Canton, Edina, La Grange, La Belle, Shelbyville, Lewistown, Ewing,
  Knox City, Greensburg, Plevna, Steffenville, Maywood, Colony,
  Emden, Hurdland, Novelty, Baring, Bethel, Monticello and Newark.

This also includes Wakonda State Park.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4030 9195 4026 9195 4026 9193 4025 9150
      4018 9151 4003 9150 3995 9144 3995 9184
      3977 9185 3976 9229 3995 9229 3996 9234
      4030 9235

$$

Kanofsky

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 7:21 PM CDT	Severe Thunderstorm Warning	LSX	Knox	39 min
May 25, 7:58 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Lewis	47 min
May 25, 8:09 PM CDT	River Flood Warning	LSX	Lewis	7 days
May 25, 8:33 PM CDT	Severe Thunderstorm Warning	LSX	Lewis	72 min
May 25, 8:50 PM CDT	Severe Thunderstorm Warning	LSX	Knox, Marion, Shelby	55 min
May 25, 9:15 PM CDT	Tornado Warning	LSX	Shelby	45 min
May 25, 9:54 PM CDT	Severe Thunderstorm Warning	LSX	Marion, Shelby	48 min
May 25, 11:29 PM CDT	Flash Flood Watch	LSX	Knox, Lewis, Marion, Shelby	10 hr
May 26, 12:30 AM CDT	Areal Flood Advisory	LSX	Knox, Lewis, Marion, Shelby	6 hr
May 26, 2:45 AM CDT	River Flood Warning	LSX	Lewis	7 days
May 26, 2:45 AM CDT	River Flood Warning	LSX	Marion	7 days
May 26, 2:59 AM CDT	River Flood Warning	LSX	Marion	60 hr

Nearby

Flash Flood Warnings in Missouri, 2019 Every flash flood warning in 2019

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.