Alert archive / Louisiana / Flash Flood Watches in 2013

Flash Flood Watch 6, NWS New Orleans, LA

April 3, 20134 parishes in Louisiana

NWS New Orleans, LA issued this flash flood watch at Apr 3, 2013, 4:20 AM CDT for 4 parishes in Louisiana. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Apr 3, 2013, 4:20 AM CDT (09:20 UTC)
Expired: Apr 3, 2013, 10:45 AM CDT
In force: 6 hr
Issued by: NWS New Orleans, LA
Flood severity: None

Counties Assumption Parish, LA, Saint Bernard Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 9.3 hours before the alert went out and 257 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: 1267 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 241 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

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 Apr 2, 11:12 PM CDT, 5 hours 8 minutes earlier.

Area forecast discussion, Apr 2, 11:12 PM CDT, 5 hours 8 minutes before

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Hazardous weather outlook, Apr 2, 6:00 PM CDT, 10 hours 20 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
Apr 3, 4:56 AM CDT	Special Marine Warning	LIX		64 min
Apr 3, 5:52 AM CDT	Special Marine Warning	LIX		53 min
Apr 3, 6:40 AM CDT	Special Marine Warning	LIX		65 min
Apr 3, 7:48 AM CDT	Special Marine Warning	LIX		57 min
Apr 3, 8:52 AM CDT	Special Marine Warning	LIX		53 min
Apr 3, 9:46 AM CDT	Special Marine Warning	LIX		89 min
Apr 3, 10:14 AM CDT	River Flood Warning	LIX	Saint Tammany, Washington	5 days
Apr 3, 10:14 AM CDT	River Flood Warning	LIX	Saint Tammany	3 days
Apr 3, 10:16 AM CDT	River Flood Warning	LIX	St. Mary	51 hr
Apr 3, 10:24 AM CDT	Special Marine Warning	LIX		51 min
Apr 3, 11:13 AM CDT	Special Marine Warning	LIX		2 hr
Apr 3, 11:40 AM CDT	High Wind Warning	LIX	Saint Bernard	2 hr
Apr 3, 11:41 AM CDT	Special Marine Warning	LIX		2 hr
Apr 3, 11:46 AM CDT	Special Marine Warning	LIX		59 min

Nearby

Flash Flood Watches in Louisiana, 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.