Alert archive / Missouri / Flash Flood Warnings in 2008

Flash Flood Warning 91, NWS St. Louis, MO

August 5, 2008Sainte Genevieve County, Missouri

NWS St. Louis, MO issued this flash flood warning at Aug 5, 2008, 4:57 PM CDT for Sainte Genevieve 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
Aug 5, 2008, 4:57 PM CDT (21:57 UTC)
Expired
Aug 5, 2008, 11:00 PM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

County Sainte Genevieve County, MO

The radar

The St Louis radar (KLSX), 100 km from the middle of the area, began a volume at 22:00 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

TimeReportWhereRemark
Aug 5, 7:35 PM CDTHEAVY RAIN 2.1Bloomsdale, MOPOWER OUTAGE REPORTED DUE TO DOWNED TREES AND TREE LIMBS OF UNKNOWN SIZE. THE RAIN FELL IN A 45 MINUTE PERIOD.

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, 10.0 hours before the alert went out and 285 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 12:00Z on 2008-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 618 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2008-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.193958Sfc1 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
618 J/kg
Mixed-layer CIN
-237 J/kg
Mixed-layer LCL
1293 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.2

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 052157
FFWLSX
MOC186-060400-
/O.NEW.KLSX.FF.W.0091.080805T2157Z-080806T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
457 PM CDT TUE AUG 5 2008

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  STE. GENEVIEVE COUNTY IN SOUTHEAST MISSOURI

* UNTIL 1100 PM CDT

* AT 451 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE WARNED AREA. RADAR
  ESTIMATES 2 TO 3 INCHES OF RAINFALL HAS OCCURRED OVER THE WARNED   
  AREA...WITH ADDITIONAL RAINFALL OF 1 TO 2 INCHES EXPECTED. 

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL AFFECT   
  THE LITTLE SALINE RIVER...THE RIVER AUXVASES...MILL CREEK...AND    
  COPPER MINE CREEK.

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.

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

LAT...LON 3767 9011 3770 9016 3768 9021 3788 9046
      3798 9032 3805 9041 3810 9033 3809 9030
      3812 9025 3797 9001 3796 8996 3791 8998
      3787 8994 3783 9000

$$

CVKING
2 follow-up statements
000 
WGUS73 KLSX 052341
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
641 PM CDT TUE AUG 5 2008

MOC186-060400-
/O.CON.KLSX.FF.W.0091.000000T0000Z-080806T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
STE. GENEVIEVE MO-
641 PM CDT TUE AUG 5 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
CENTRAL STE. GENEVIEVE COUNTY...

AT 632 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE WARNED
AREA.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ROCKY RIDGE 
RIVER AUX VASES...WEINGARTEN AND BLOOMSDALE.

RADAR ESTIMATES UP TO 4 INCHES OF RAINFALL HAS OCCURRED THIS EVENING 
IN THIS AREA. AN ADDITIONAL INCH OF RAINFALL IS POSSIBLE IN THE 
WARNED AREA. 

RIVERS AND CREEKS IN THIS AREA ARE LIKELY EXPERIENCING FLASH 
FLOODING AND THEY INCLUDE LITTLE SALINE RIVER...THE RIVER AUX 
VASES...MILL CREEK...AND COPPER MINE CREEK.  

IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE 
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS 
FLOODED ROADS. FIND ALTERNATE ROUTES. IT TAKES ONLY A FEW INCHES OF 
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

FLASH FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING 
AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG 
STREAMS AND CREEKS IN THE WARNED AREA 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 3788 9045 3798 9032 3805 9041 3796 8996
      3791 8998 3787 8994 3782 9001

$$

CVKING
000 
WGUS73 KLSX 060404
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1104 PM CDT TUE AUG 5 2008

MOC186-060412-
/O.EXP.KLSX.FF.W.0091.000000T0000Z-080806T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
STE. GENEVIEVE MO-
1104 PM CDT TUE AUG 5 2008

...THE FLASH FLOOD WARNING HAS EXPIRED FOR CENTRAL STE. GENEVIEVE
COUNTY...

ALTHOUGH LIGHT TO OCCASIONALLY MODERATE RAIN LINGERS OVER STE. 
GENEVIEVE COUNTY...THE HEAVIEST RAIN HAS EXITED THE AREA.  
AND...MUCH OF THE RAIN SHOULD TAPER OFF BY MIDNIGHT.

SOME FLOODING WAS REPORTED IN THE CITY OF STE. GENEVIEVE EARLIER IN 
THE EVENING...HOWEVER THIS FLOODING HAS SUBSIDED AND A CHECK WITH 
AREA LAW ENFORCEMENT INDICATES THAT FLOODING IS NO LONGER A PROBLEM 
IN THE COUNTY.  

MOTORISTS SHOULD USE CAUTION WHEN APPROACHING AREAS THAT EXPERIENCED
HIGH WATER LEVELS...AS THE FAST FLOWING WATER MAY HAVE DAMAGED 
ROADWAYS AND BRIDGES.  ALSO...MOTORISTS SHOULD REMAIN ALERT WHEN 
APPROACHING LOW WATER CROSSINGS.

LAT...LON 3788 9045 3798 9032 3805 9041 3796 8996
      3791 8998 3787 8994 3782 9001

$$

TRUETT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 2:29 PM CDTSevere Thunderstorm WarningLSXMarion, Pike, Ralls46 min
Aug 5, 2:56 PM CDTSevere Thunderstorm WarningLSXPike49 min
Aug 5, 3:14 PM CDTSevere Thunderstorm WarningLSXMarion, Pike, Ralls46 min
Aug 5, 3:23 PM CDTFlash Flood WarningLSXMarion, Ralls6 hr
Aug 5, 4:05 PM CDTSevere Thunderstorm WarningLSXPike40 min
Aug 5, 4:14 PM CDTSevere Thunderstorm WarningLSXAudrain, Monroe, Ralls61 min
Aug 5, 4:18 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve42 min
Aug 5, 4:44 PM CDTFlash Flood WarningLSXAudrain, Monroe, Pike, Ralls6 hr
Aug 5, 4:44 PM CDTSevere Thunderstorm WarningLSXPike46 min
Aug 5, 5:03 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike42 min
Aug 5, 5:24 PM CDTSevere Thunderstorm WarningLSXWashington51 min
Aug 5, 5:30 PM CDTSevere Thunderstorm WarningLSXLincoln, Pike, Saint Charles60 min
Aug 5, 5:59 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve46 min
Aug 5, 6:05 PM CDTSevere Thunderstorm WarningLSXJefferson, Saint Francois, Washington55 min
Aug 5, 6:09 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis, City of Saint Louis51 min
Aug 5, 6:40 PM CDTSevere Thunderstorm WarningLSXLincoln, Montgomery, Saint Charles, Warren50 min
Aug 5, 6:41 PM CDTSevere Thunderstorm WarningLSXFranklin, Gasconade49 min
Aug 5, 6:44 PM CDTSevere Thunderstorm WarningLSXJefferson, Sainte Genevieve, Saint Francois61 min
Aug 5, 6:59 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade61 min

Nearby

Flash Flood Warnings in Missouri, 2008Every flash flood warning in 2008

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.