Alert archive / Missouri / Flash Flood Warnings in 2009

Flash Flood Warning 80, NWS St. Louis, MO

October 8, 2009Franklin County, Gasconade County, Missouri

NWS St. Louis, MO issued this flash flood warning at Oct 8, 2009, 1:09 PM CDT for Franklin County, Gasconade County, Missouri. It was in force for 5 hr. 4 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: Oct 8, 2009, 1:09 PM CDT (18:09 UTC)
Expired: Oct 8, 2009, 6:00 PM CDT
In force: 5 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Franklin County, MO, Gasconade County, MO

The radar

The St Louis radar (KLSX), 48 km from the middle of the area, began a volume at 18:12 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
Oct 8, 4:00 PM CDT	HEAVY RAIN 2.5	Pacific, MO	PUBLIC REPORT
Oct 8, 4:00 PM CDT	HEAVY RAIN 2.73	New Haven, MO	PUBLIC REPORT
Oct 8, 5:40 PM CDT	HEAVY RAIN 4	7 W New Haven, MO
Oct 8, 6:00 PM CDT	HEAVY RAIN 2.16	5 Ne Rosebud, MO	1.70 INCHES SINCE 7 AM

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, 6.2 hours before the alert went out and 287 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: 591 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 081809
FFWLSX
MOC071-073-082300-
/O.NEW.KLSX.FF.W.0080.091008T1809Z-091008T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
109 PM CDT THU OCT 8 2009

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  FRANKLIN COUNTY IN EAST CENTRAL MISSOURI...
  GASCONADE COUNTY IN EAST CENTRAL MISSOURI...

* UNTIL 600 PM CDT

* AT 105 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A LARGE AREA OF MODERATE AND OCCASIONALLY HEAVY RAIN MOVING OUT 
  OF THE NORTHERN OZARKS AND INTO FRANKLIN AND GASCONADE COUNTIES.  
  ALTHOUGH SOME RAIN FELL IN THESE AREAS DURING THE MORNING...
  THE RAINFALL WILL BECOME MUCH HEAVIER AND MORE WIDESPREAD
  AS WE HEAD INTO THE  AFTERNOON AND EARLY EVENING HOURS.
  ADDITIONAL RAINS OF 1 TO 3 INCHES...WITH LOCALLY HIGHER AMOUNTS...
  WILL CERTAINY BE POSSIBLE BY LATER THIS EVENING.  THIS WILL CAUSE
  THE DANGERS FROM FLASH FLOODING TO INCREASE SIGNIFICANTLY
  THROUGHOUT THE AFTERNOON AND EARLY EVENING HOURS.      

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...GRAY
  SUMMIT...HERMANN...NEW HAVEN...OWENSVILLE...PACIFIC...ST. CLAIR...
  SULLIVAN...UNION...VILLA RIDGE...WASHINGTON...BEAUFORT...BLAND...
  DRAKE...GERALD...LONEDELL...MOUNT STERLING...PARKWAY AND ROSEBUD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...
COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND
OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.

FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR
IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES...
DIPS... OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING
STREAM... EVEN A SMALL ONE...ON FOOT OR IN A VEHICLE.

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 ONLY TAKES A FEW INCHES OF
SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST
LOUIS.

&&

LAT...LON 3868 9158 3872 9143 3870 9133 3861 9120
      3861 9106 3856 9101 3854 9095 3854 9089
      3858 9082 3858 9078 3863 9074 3838 9074
      3821 9078 3821 9154 3816 9154 3816 9165
      3871 9165

$$

TRUETT

1 follow-up statement

000 
WGUS73 KLSX 082056
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
356 PM CDT THU OCT 8 2009

MOC071-073-082300-
/O.CON.KLSX.FF.W.0080.000000T0000Z-091008T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FRANKLIN MO-GASCONADE MO-
356 PM CDT THU OCT 8 2009

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR GASCONADE AND FRANKLIN 
COUNTIES UNTIL 600 PM CDT...

AT 352 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
AREAS OF MODERATE RAIN FALLING ACROSS THE WARNED AREA. ALTHOUGH THE 
HEAVIEST RAINS OVER GASCONADE AND FRANKLIN COUNTIES HAS NOT BEEN 
EXTREMELY INTENSE OR WIDESPREAD SO FAR...ALL INDICATIONS ARE THAT 
THE INCREASING RAINFALL WILL BE MAKING FOR A SERIOUS FLASH FLOOD 
THREAT AS THE EVENING PROGRESSES. 

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...GRAY 
SUMMIT...HERMANN...NEW HAVEN...OWENSVILLE...PACIFIC...ST. 
CLAIR...SULLIVAN...UNION...VILLA RIDGE...
WASHINGTON...BEAUFORT...BLAND...DRAKE...GERALD...LONEDELL...
MOUNT STERLING...PARKWAY AND ROSEBUD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE
ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON
FOOT OR IN A VEHICLE.

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 ONLY TAKES A FEW INCHES OF SWIFTLY 
FLOWING WATER TO CARRY VEHICLES AWAY.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS.

&&

LAT...LON 3868 9158 3872 9143 3870 9133 3861 9120
      3861 9106 3856 9101 3854 9095 3854 9089
      3858 9082 3858 9078 3863 9074 3838 9074
      3821 9078 3821 9154 3816 9154 3816 9165
      3871 9165

$$

TRUETT

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 8, 7:01 AM CDT	Flash Flood Warning	LSX	Boone, Callaway, Lincoln, Montgomery, Warren	6 hr
Oct 8, 8:51 AM CDT	Flash Flood Warning	LSX	Saint Charles, Saint Louis, City of Saint Louis	4 hr
Oct 8, 9:43 AM CDT	Flash Flood Warning	LSX	Cole, Moniteau, Osage	3 hr
Oct 8, 9:58 AM CDT	River Flood Warning	LSX	Lincoln	55 hr
Oct 8, 10:42 AM CDT	Flash Flood Warning	LSX	Audrain, Boone	3 hr
Oct 8, 12:12 PM CDT	Flash Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Moniteau, Montgomery and 1 more	6 hr
Oct 8, 12:42 PM CDT	Flash Flood Warning	LSX	Lincoln, Saint Charles, Saint Louis, Warren, City of Saint Louis	5 hr
Oct 8, 1:12 PM CDT	River Flood Warning	LSX	Osage	55 hr
Oct 8, 1:12 PM CDT	River Flood Warning	LSX	Cole	66 hr
Oct 8, 6:04 PM CDT	Areal Flood Warning	LSX	Audrain, Boone, Callaway, Cole, Franklin, Gasconade and 9 more	18 hr

Nearby

Flash Flood Warnings in Missouri, 2009 Every flash flood warning in 2009

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.