Alert archive / Louisiana / Flood Watches in 2009

Flood Watch 2, NWS Lake Charles, LA

November 8, 20097 parishes in Louisiana

NWS Lake Charles, LA issued this flood watch at Nov 8, 2009, 8:11 PM CST for 7 parishes in Louisiana. It took effect at Nov 9, 2009, 12:00 AM CST. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Nov 8, 2009, 8:11 PM CST (02:11 UTC)
In effect from
Nov 9, 2009, 12:00 AM CST
Expired
Nov 9, 2009, 5:58 AM CST
In force
6 hr
Issued by
NWS Lake Charles, LA
Flood severity
None

Counties Allen Parish, LA, Avoyelles Parish, LA, Evangeline Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 2.2 hours before the alert went out and 244 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, Slidell Radar S, LA at 00:00Z on 2009-11-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 22 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, Slidell Radar S, LA at 00:00Z on 2009-11-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 square meters per square second.19395878Sfc1 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
22 J/kg
Mixed-layer CIN
-392 J/kg
Mixed-layer LCL
857 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 8, 7:32 PM CSTGale WarningLCH10 hr
Nov 8, 7:32 PM CSTSmall Craft AdvisoryLCH3 days

Nearby

Flood Watches in Louisiana, 2009Every 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.