Alert archive / Missouri / Flash Flood Warnings in 2015

Flash Flood Warning 43, NWS St. Louis, MO

June 28, 2015Saint Louis County, Missouri

NWS St. Louis, MO issued this flash flood warning at Jun 28, 2015, 9:50 PM CDT for Saint Louis County, Missouri. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 28, 2015, 9:50 PM CDT (02:50 UTC)
Expired
Jun 29, 2015, 3:30 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

County Saint Louis County, MO

The radar

The St Louis radar (KLSX), 22 km from the middle of the area, began a volume at 02:50 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.8 hours before the alert went out and 222 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2015-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 281 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2015-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
281 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
900 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
34 m²/s²
0-3 km storm-relative helicity
331 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

042 
WGUS53 KLSX 290250
FFWLSX
MOC189-290830-
/O.NEW.KLSX.FF.W.0043.150629T0250Z-150629T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
950 PM CDT SUN JUN 28 2015

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWEST ST. LOUIS COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 330 AM CDT

* AT 941 PM CDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED FLASH
  FLOODING IN THE MARYLAND HEIGHTS AND BRIDGETON AREAS FROM FLOODING
  ALONG FEE FEE CREEK...AND WATER WAS BEGINNING TO ENTER SOME HOMES
  IN THE AREA.  THIS FLOODING IS OCCURRING IN AREAS THAT OFTEN 
  EXPERIENCE FLOODING DURING TIMES OF HEAVY RAIN.  1 TO 2 INCHES
  OF RAIN FELL IN THIS AREA  SUNDAY EVENING IN LESS THAN AN HOURS
  TIME...WITH ISOLATED HEAVIER AMOUNTS.    

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BRIDGETON...
  MARYLAND HEIGHTS...OVERLAND...ST. ANN...ST. JOHN AND WOODSON
  TERRACE.

THIS WARNING ALSO INCLUDES...
INTERSTATE 70 IN MISSOURI NEAR EXIT 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3871 9033 3866 9040 3873 9053 3874 9052
      3877 9048 3879 9047 3882 9045

$$

TRUETT
1 follow-up statement
290 
WGUS73 KLSX 290825
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
325 AM CDT MON JUN 29 2015

MOC189-290840-
/O.EXP.KLSX.FF.W.0043.000000T0000Z-150629T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. LOUIS MO-
325 AM CDT MON JUN 29 2015

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL ST. LOUIS
COUNTY WILL BE ALLOWED TO EXPIRE AT 330 AM CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3871 9033 3866 9040 3873 9053 3874 9052
      3877 9048 3879 9047 3882 9045

$$

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 7:28 PM CDTSevere Thunderstorm WarningLSXLincoln, Saint Charles47 min
Jun 28, 8:00 PM CDTSevere Thunderstorm WarningLSXCrawford45 min
Jun 28, 8:02 PM CDTTornado WarningLSXSaint Charles, Saint Louis28 min
Jun 28, 8:26 PM CDTTornado WarningLSXSaint Charles, Saint Louis37 min
Jun 28, 8:48 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis42 min
Jun 28, 9:17 PM CDTAreal Flood AdvisoryLSXSaint Louis, City of Saint Louis3 hr
Jun 29, 5:08 PM CDTSevere Thunderstorm WarningLSXPike37 min

Nearby

Flash Flood Warnings in Missouri, 2015Every flash flood warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.