Alert archive / Louisiana / Flash Flood Watches in 2013

Flash Flood Watch 5, NWS New Orleans, LA

February 24, 20138 parishes in Louisiana; 4 counties in Mississippi

NWS New Orleans, LA issued this flash flood watch at Feb 24, 2013, 7:15 AM CST for 8 parishes in Louisiana; 4 counties in Mississippi. It took effect at Feb 24, 2013, 9:00 PM CST. It was in force for 25 hr.

The area

The counties it named.

The facts

Issued: Feb 24, 2013, 7:15 AM CST (13:15 UTC)
In effect from: Feb 24, 2013, 9:00 PM CST
Expired: Feb 25, 2013, 10:11 PM CST
In force: 25 hr
Issued by: NWS New Orleans, LA
Flood severity: None

Counties Assumption Parish, LA, Iberville Parish, LA, Saint Bernard Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.3 hours before the alert went out and 81 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: 884 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -51 m²/s²
0-3 km storm-relative helicity: 67 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 New Orleans, LA wrote its last area forecast discussion before this flash flood watch went out at Feb 24, 4:53 AM CST, 2 hours 22 minutes earlier.

Area forecast discussion, Feb 24, 4:53 AM CST, 2 hours 22 minutes before

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Hazardous weather outlook, Feb 24, 6:01 AM CST, 1 hour 14 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 2:51 PM CST	Wind Advisory	LIX	Saint Bernard, Saint John the Baptist	14 hr
Feb 24, 3:10 PM CST	Small Craft Advisory	LIX		54 hr
Feb 24, 5:21 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	39 min
Feb 24, 5:40 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	50 min
Feb 24, 5:57 PM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	48 min
Feb 23, 8:56 PM CST	River Flood Warning	LIX	Harrison	4 days

Nearby

Flash Flood Watches in Louisiana, 2013 Flash Flood Watches in Mississippi, 2013 Every flash flood watch in 2013

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.