Alert archive / Louisiana / Flash Flood Warnings in 2003

Flash Flood Warning 13, NWS New Orleans, LA

June 30, 2003Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jun 30, 2003, 1:09 PM CDT for Saint Tammany Parish, Tangipahoa Parish, Louisiana. 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: Jun 30, 2003, 1:09 PM CDT (18:09 UTC)
Expired: Jun 30, 2003, 4:00 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.2 hours before the alert went out and 55 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: 124 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KLIX 301812
FFWNEW
LAC103-105-302100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
109 PM CDT MON JUN 30 2003

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA
  TANGIPAHOA PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITIES OF HAMMOND...COVINGTON AND MANDEVILLE

* UNTIL 400 PM CDT

* AT 103 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY       
  HEAVY RAIN OVER THE NORTH HALF OF LAKE PONTCHARTRAIN...MOVING      
  NORTH.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS...STREETS AND UNDERPASSES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED. MOVE TO HIGHER
GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 9:50 AM CDT	Tornado Warning	LIX	Plaquemines	25 min
Jun 30, 10:07 AM CDT	Flash Flood Warning	LIX	Assumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 4 more	4 hr
Jun 30, 10:46 AM CDT	Tornado Warning	LIX	Saint Bernard	44 min
Jun 30, 11:54 AM CDT	Tornado Warning	LIX	Saint Bernard	31 min
Jun 30, 12:31 PM CDT	Tornado Warning	LIX	Saint John the Baptist	29 min
Jun 30, 12:43 PM CDT	Tornado Warning	LIX	Orleans	32 min
Jun 30, 1:17 PM CDT	Tornado Warning	LIX	Saint Tammany	28 min
Jun 30, 5:11 PM CDT	Flash Flood Warning	LIX	Saint Tammany, Tangipahoa, Washington	4 hr

Nearby

Flash Flood Warnings in Louisiana, 2003 Every flash flood warning in 2003

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.