Alert archive / Louisiana / Flash Flood Warnings in 2009

Flash Flood Warning 115, NWS Shreveport, LA

October 30, 20094 parishes in Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this flash flood warning at Oct 30, 2009, 6:29 AM CDT for 4 parishes in Louisiana; Union County, Arkansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 30, 2009, 6:29 AM CDT (11:29 UTC)
Expired: Oct 30, 2009, 9:30 AM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Union County, AR, Bienville Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 99 km from the middle of the area, began a volume at 11:28 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

Shreveport, LA (KSHV), launched 00:00Z, 11.5 hours before the alert went out and 90 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: 1620 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 510 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 278 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 14.3

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Shreveport, LA wrote its last area forecast discussion before this flash flood warning went out at Oct 30, 3:46 AM CDT, 2 hours 43 minutes earlier.

Area forecast discussion, Oct 30, 3:46 AM CDT, 2 hours 43 minutes before

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Hazardous weather outlook, Oct 30, 5:51 AM CDT, 38 minutes before

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In the hours before

Local storm report, Oct 30, 1:43 AM CDT, 4 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
143 AM CDT FRI OCT 30 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0135 AM     FLASH FLOOD      3 NW HODGE              32.30N 92.77W
10/30/2009                   JACKSON            LA   LAW ENFORCEMENT

            HIGH WATER OVER BEAR CREEK ROAD NORTHWEST OF HODGE.

&&

15

Local storm report, Oct 30, 1:53 AM CDT, 4 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
153 AM CDT FRI OCT 30 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0150 AM     FLASH FLOOD      HOMER                   32.79N 93.06W
10/30/2009                   CLAIBORNE          LA   LAW ENFORCEMENT

            SEVERAL HOMES HAVE BEEN EVACUATED ON CARTER DRIVE IN
            HOMER DUE TO FLOODING. NUMEROUS ROADS ARE FLOODED ACROSS
            THE PARISH.

&&

15

Local storm report, Oct 30, 2:30 AM CDT, 3 hours 59 minutes before

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Local storm report, Oct 30, 4:06 AM CDT, 2 hours 23 minutes before

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Local storm report, Oct 30, 5:53 AM CDT, 36 minutes before

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Local storm report, Oct 30, 6:04 AM CDT, 25 minutes before

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The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 29, 8:36 PM CDT	Flash Flood Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	4 hr
Oct 29, 9:02 PM CDT	Flash Flood Warning	SHV	Harrison, Panola, Shelby	4 hr
Oct 29, 9:23 PM CDT	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	5 days
Oct 30, 12:31 AM CDT	Flash Flood Warning	SHV	Angelina, Nacogdoches, San Augustine	4 hr
Oct 30, 1:00 AM CDT	Flash Flood Warning	SHV	Harrison, Panola, Shelby	4 hr
Oct 30, 4:32 AM CDT	Areal Flood Warning	SHV	Angelina, Nacogdoches, San Augustine	4 hr
Oct 30, 4:48 AM CDT	Areal Flood Warning	SHV	Harrison, Panola, Shelby	4 hr
Oct 30, 5:51 AM CDT	River Flood Warning	SHV	Sabine, San Augustine	3 hr
Oct 30, 12:09 PM CDT	River Flood Warning	SHV	Sabine, San Augustine	22 hr
Oct 29, 7:13 PM CDT	Tornado Warning	SHV	Bossier, Webster	32 min
Oct 29, 7:49 PM CDT	Flash Flood Warning	SHV	Bossier, Claiborne, Webster	8 hr
Oct 29, 9:12 PM CDT	River Flood Warning	SHV	Bossier	4 days
Oct 29, 9:13 PM CDT	Flash Flood Warning	SHV	Bossier, Caddo, De Soto	4 hr
Oct 29, 9:29 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	46 min
Oct 29, 10:21 PM CDT	Flash Flood Warning	SHV	Bienville, Claiborne, Lincoln, Red River, Union	4 hr
Oct 30, 12:55 AM CDT	Flash Flood Warning	SHV	Bossier, Caddo, De Soto	4 hr
Oct 30, 1:30 AM CDT	Flash Flood Warning	SHV	Grant, Jackson, Natchitoches, Ouachita, Winn	7 hr
Oct 30, 2:13 AM CDT	Flash Flood Warning	SHV	Bienville, Lincoln, Red River, Union	4 hr
Oct 30, 3:45 AM CDT	Flash Flood Warning	SHV	Claiborne, Webster	4 hr
Oct 30, 3:54 AM CDT	River Flood Warning	SHV	Caddo, De Soto	14 days
Oct 30, 4:41 AM CDT	Areal Flood Warning	SHV	Bossier, Caddo, De Soto	4 hr
Oct 30, 6:15 AM CDT	Areal Flood Warning	SHV	Bienville, Claiborne, Webster	60 min
Oct 30, 7:43 AM CDT	Areal Flood Warning	SHV	Claiborne, Webster	2 hr
Oct 30, 8:31 AM CDT	Areal Flood Warning	SHV	Bienville, Caldwell, Grant, Jackson, LaSalle, Lincoln and 6 more	3 hr
Oct 30, 9:55 AM CDT	River Flood Warning	SHV	Bossier, Caddo, Red River	23 hr
Oct 30, 11:14 AM CDT	River Flood Warning	SHV	Caldwell, Ouachita	31 days
Oct 30, 11:38 AM CDT	River Flood Warning	SHV	Claiborne, Lincoln, Union	35 hr
Oct 29, 8:09 PM CDT	Tornado Warning	SHV	Columbia, Union	36 min

Nearby

Flash Flood Warnings in Louisiana, 2009 Flash Flood Warnings in Arkansas, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.