Alert archive / Missouri / Flash Flood Watches in 2009

Flash Flood Watch 10, NWS St. Louis, MO

June 10, 20096 counties in Missouri

NWS St. Louis, MO issued this flash flood watch at Jun 10, 2009, 4:04 PM CDT for 6 counties in Missouri. It took effect at Jun 10, 2009, 7:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jun 10, 2009, 4:04 PM CDT (21:04 UTC)
In effect from: Jun 10, 2009, 7:00 PM CDT
Expired: Jun 11, 2009, 3:53 AM CDT
In force: 9 hr
Issued by: NWS St. Louis, MO
Flood severity: None

Counties Crawford County, MO, Iron County, MO, Madison County, MO, Reynolds County, MO, Saint Francois County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 113 km from the middle of the area, began a volume at 21:05 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

Springfield, MO (KSGF), launched 12:00Z, 9.1 hours before the alert went out and 281 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: 1058 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 888 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 390 m²/s²
0-3 km storm-relative helicity: 408 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 16.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this flash flood watch went out at Jun 10, 3:26 PM CDT, 38 minutes earlier.

Area forecast discussion, Jun 10, 3:26 PM CDT, 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
326 PM CDT WED JUN 10 2009

.DISCUSSION...
/325 PM CDT WED JUN 10 2009/
FRONTAL BOUNDARY CONTINUES TO LINGER OVER FORECAST AREA TODAY...
EXTENDING FROM SURFACE LOW OVER SOUTHEASTERN KS...JUST NORTH OF
JOPLIN TO JUST SOUTH OF COU...THEN ALONG I-70 CORRIDOR INTO
ILLINOIS. IN THE MEANTIME...CONVECTIVE SYSTEM THAT DEVELOPED OVER
WESTERN OK...AS EMBEDDED SHORTWAVE LIFTS OUT OF NEW MEXICO...IS
SLIDING TO THE NORTHEAST AND SHOULD APPROACH SW MO IN THE NEXT
COUPLE OF HOURS. ALSO...MAJOR BREAKS IN THE CLOUD OVER OVER SOUTHERN
HALF OF MO...HAS ALLOWED SB CAPES TO APPROACH 5000 J/KG WITH LITTLE
OR NO CIN. SO IN ADDITION TO THE STORMS APPROACHING MO...SHOULD SEE
STORMS DEVELOP ALONG AND SOUTH OF I-70 CORRIDOR IN THE NEXT COUPLE OF
HOURS WITH THE MAIN THREATS BEING LARGE HAIL AND DAMAGING WINDS.
SYSTEM WILL PROBABLY PRODUCE POCKETS OF HEAVY RAIN OVER CENTRAL AND
SOUTHERN AREAS OF THE FA TONIGHT...BUT PROGRESSIVE NATURE OF SYSTEM
SHOULD LESSEN FLASH FLOOD THREAT.  THE ONE EXCEPTION TO THIS IS IN
THE FAR S COUNTIES WHERE AMOUNTS SHOULD BE THE HEAVIEST...AND
PERHAPS MORE IMPORTANTLY POCKETS OF HEAVY RAIN HAVE OCCURRED OVER
THE LAST 2 NIGHTS...IE PARTS OF SOUTHERN CRAWFORD...REYNOLDS...IRON
...AND MADISON COUNTIES.  BECAUSE OF THIS...WILL BE ISSUING A FLASH
FLOOD WATCH FOR MUCH OF SOUTHEAST MISSOURI FOR TONIGHT.

BY TOMORROW MORNING...SYSTEM WILL BE EXITING REGION...BUT COULD SEE
DECENT ACTIVITY...SO KEPT LIKELY POPS FOR EASTERN TWO THIRDS OF CWA
THROUGH 18Z...THEN BACK OFF TO SLIGHT CHANCE POPS IN THE NW HALF AND
CHANCE POPS IN SOUTHEAST HALF OF CWA FOR THE AFTERNOON HOURS.
DEPENDING ON CLOUD COVER AND PCPN NOT REAL CONFIDENT ON HOW TO
HANDLE TEMPS. FOR NOW WILL SEE LOWER 70S IN THE FAR NORTH AND LOWER
80S IN THE FAR SOUTH.

THURSDAY NIGHT THROUGH FRIDAY NIGHT...WE SHOULD DRY OUT...THOUGH
KEPT SLIGHT CHANCE POPS FOR PORTIONS OF THE AREA. LOWS THURSDAY
NIGHT WILL BE IN THE MID 50S TO LOWER 60S...HIGHS ON FRIDAY WILL BE
IN THE MID 70S TO LOWER 80S...AND LOWS FRIDAY NIGHT WILL BE IN THE
UPPER 50S TO LOWER 60S.

EXTENDED MODELS CONTINUE TO BE ALL OVER THE PLACE...SO JUST WENT
WITH STATUS QUO...MAKING ONLY MINOR ADJUSTMENTS TO GOING GRIDS. HAVE
LOW CHANCE POPS FOR PORTIONS OF THE FORECAST AREA SATURDAY THROUGH
MONDAY NIGHT...THEN DRY FOR REST OF EXTENDED AT THIS TIME.

BYRD
&&

.AVIATION...
/1251 PM CDT WED JUN 10 2009/
FOR THE 18Z TAFS...
VIS SAT AND SFC OB TRENDS INDICATE THAT THE IFR TO MVFR CLOUD DECK
PLAGUING THE TERMINALS THIS MORNING HAS STARTED TO THIN AND EXPECT
MOST SITES TO BE MVFR SHORTLY AFTER ISSUANCE. ATTENTION THEN TURNS
TO ANTICIPATED CONVECTION LATER TONIGHT AS EJECTING SW TROF
PRODUCES LARGE SCALE ASCENT ACROSS THE REGION WITH BEST CHANCES FOR TS
AFTER 21Z. EXPECT CIGS/VSBYS TO LOWER OVERNIGHT WITH ARRIVAL OF
PCPN. WINDS WILL TEND TO BE LIGHT AND VARIABLE INVOF
QUASISTATIONARY FRONT AS IT MEANDERS ACROSS CENTRAL MO. ATTM IFR
CIGS APPEAR LIKELY INVOF THE FRONT TOMORROW MORNING.

KANOFSKY
&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...FLASH FLOOD WATCH FROM 7 PM CDT THIS EVENING THROUGH THURSDAY
     MORNING FOR CRAWFORD-IRON-MADISON-REYNOLDS-ST. FRANCOIS-
     WASHINGTON.

IL...NONE.
&&

WFO LSX

Hazardous weather outlook, Jun 10, 4:03 PM CDT, 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 7:48 PM CDT	Flash Flood Warning	LSX	Iron, Madison	6 hr
Jun 9, 11:32 PM CDT	Areal Flood Advisory	LSX	Marion, Monroe, Ralls, Shelby	6 hr
Jun 9, 11:38 PM CDT	Areal Flood Warning	LSX	Reynolds	6 hr
Jun 10, 12:22 AM CDT	Severe Thunderstorm Warning	LSX	Moniteau	53 min
Jun 10, 12:23 AM CDT	River Flood Warning	LSX	Reynolds	9 hr
Jun 10, 6:51 PM CDT	Severe Thunderstorm Warning	LSX	Cole, Moniteau	39 min

Nearby

Flash Flood Watches in Missouri, 2009 Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.