Alert archive / Missouri / Flash Flood Watches in 2009

Flash Flood Watch 11, NWS St. Louis, MO

June 15, 200929 counties in Missouri; 17 counties in Illinois

NWS St. Louis, MO issued this flash flood watch at Jun 15, 2009, 3:42 PM CDT for 29 counties in Missouri; 17 counties in Illinois. It took effect at Jun 15, 2009, 9:00 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Jun 15, 2009, 3:42 PM CDT (20:42 UTC)
In effect from: Jun 15, 2009, 9:00 PM CDT
Expired: Jun 16, 2009, 12:00 PM CDT
In force: 15 hr
Issued by: NWS St. Louis, MO
Flood severity: None

All 46 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Clinton County, IL, Fayette County, IL, Greene County, IL, Jersey County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Pike County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Madison County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shelby County, MO, Warren County, MO, Washington County, MO

The radar

The St Louis radar (KLSX), 18 km from the middle of the area, began a volume at 20:42 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 12:00Z, 8.7 hours before the alert went out and 241 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: 1288 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 15, 12:37 PM CDT, 3 hours 5 minutes earlier.

Area forecast discussion, Jun 15, 12:37 PM CDT, 3 hours 5 minutes before

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Hazardous weather outlook, Jun 15, 4:00 AM CDT, 11 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
400 AM CDT MON JUN 15 2009

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-161200-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX-LEWIS-
SHELBY-MARION-MONROE-RALLS-PIKE-BOONE-AUDRAIN-MONITEAU-COLE-OSAGE-
CALLAWAY-MONTGOMERY-LINCOLN-GASCONADE-WARREN-ST. CHARLES-FRANKLIN-
ST. LOUIS-ST. LOUIS CITY-JEFFERSON-CRAWFORD-WASHINGTON-
ST. FRANCOIS-STE. GENEVIEVE-IRON-MADISON-REYNOLDS-
400 AM CDT MON JUN 15 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TODAY AND TONIGHT

SEVERAL ROUNDS OF THUNDERSTORMS ARE EXPECTED...PRIMARILY THROUGH
EARLY THIS AFTERNOON AND AGAIN FROM LATE THIS EVENING THROUGH
LATE TONIGHT. STRONG TO SEVERE STORMS ARE POSSIBLE WITH THE
POTENTIAL FOR LARGE HAIL AND DAMAGING WINDS. IN ADDITION...LOCALLY
HEAVY RAINFALL WHICH COULD LEAD TO FLASH FLOODING WILL BE A
CONCERN. SEE THE HYDROLOGIC OUTLOOK PRODUCT FOR SPECIFIC DETAILS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

ANOTHER ROUND OF THUNDERSTORMS IS EXPECTED ON TUESDAY. STRONG TO
SEVERE STORMS ARE POSSIBLE WITH THE POTENTIAL FOR LARGE HAIL AND
DAMAGING WINDS. IN ADDITION...LOCALLY HEAVY RAINFALL WHICH COULD
LEAD TO FLASH FLOODING WILL BE A CONCERN AS 2 TO LOCALLY 4 INCHES
OF RAINFALL APPEAR LIKELY ACROSS THE AREA DURING THIS PERIOD. SEE
THE HYDROLOGIC OUTLOOK PRODUCT FOR SPECIFIC DETAILS.

THUNDERSTORMS WILL AGAIN BE POSSIBLE ON FRIDAY.

ADDITIONALLY...HEAT INDEX READINGS BETWEEN 100 AND 105 DEGREES
WILL BE POSSIBLE ON THURSDAY AFTERNOON.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE MAINLY FOR PORTIONS OF CENTRAL AND
SOUTHEASTERN MISSOURI AS WELL AS THE ST. LOUIS METRO AREA.

&&

FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR
WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1

TES

In the hours before

Local storm report, Jun 15, 1:02 PM CDT, 2 hours 40 minutes before

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Local storm report, Jun 15, 1:09 PM CDT, 2 hours 33 minutes before

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Local storm report, Jun 15, 1:14 PM CDT, 2 hours 28 minutes before

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Local storm report, Jun 15, 2:43 PM CDT, 59 minutes before

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Local storm report, Jun 15, 2:45 PM CDT, 57 minutes before

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Local storm report, Jun 15, 2:47 PM CDT, 55 minutes 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 15, 6:07 AM CDT	Flash Flood Warning	LSX	Callaway	6 hr
Jun 15, 7:41 AM CDT	Flash Flood Warning	LSX	Montgomery, Warren	6 hr
Jun 15, 8:28 AM CDT	Areal Flood Advisory	LSX	Boone	6 hr
Jun 15, 8:54 AM CDT	Areal Flood Advisory	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis	4 hr
Jun 15, 9:03 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Iron, Reynolds	42 min
Jun 15, 9:09 AM CDT	Flash Flood Warning	LSX	Franklin, Jefferson, Saint Charles, Saint Louis, City of Saint Louis	6 hr
Jun 15, 9:44 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Reynolds, Saint Francois	46 min
Jun 15, 10:25 AM CDT	Severe Thunderstorm Warning	LSX	Iron, Madison	50 min
Jun 15, 11:25 AM CDT	Severe Thunderstorm Warning	LSX	Crawford, Iron, Washington	50 min
Jun 15, 12:03 PM CDT	Areal Flood Advisory	LSX	Crawford	6 hr
Jun 15, 12:05 PM CDT	Tornado Warning	LSX	Reynolds	25 min
Jun 15, 12:27 PM CDT	Tornado Warning	LSX	Reynolds	33 min
Jun 15, 12:55 PM CDT	Tornado Warning	LSX	Iron, Reynolds	50 min
Jun 15, 3:01 PM CDT	Areal Flood Warning	LSX	Saint Charles, Saint Louis	4 hr
Jun 15, 5:53 PM CDT	River Flood Warning	LSX	Reynolds	51 hr
Jun 15, 6:39 PM CDT	Areal Flood Warning	LSX	Saint Charles	6 hr

Nearby

Flash Flood Watches in Missouri, 2009 Flash Flood Watches in Illinois, 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.