Alert archive / Louisiana / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 84, NWS New Orleans, LA

July 24, 2002Ascension Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jul 24, 2002, 3:14 PM CDT for Ascension Parish, Saint James Parish, Saint John the Baptist Parish, Louisiana. It was in force for 31 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 24, 2002, 3:14 PM CDT (20:14 UTC)
Expired: Jul 24, 2002, 3:45 PM CDT
In force: 31 min
Issued by: NWS New Orleans, LA
Area: Counties, with a storm outline in the text

Counties Ascension Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA

What was reported inside it

Time	Report	Where	Remark
Jul 24, 3:20 PM CDT	Thunderstorm Wind	Brittany, LA	A few trees were blown down.
Jul 24, 3:35 PM CDT	Thunderstorm Wind	Gramercy, LA	A tree was knocked down along Highway 61.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.2 hours before the alert went out and 104 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: 900 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1220 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

146 
WUUS54 KLIX 242014
SVRNEW
LAC005-093-095-242045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
314 PM CDT WED JUL 24 2002

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ASCENSION PARISH IN SOUTHEAST LOUISIANA
  ST. JAMES PARISH IN SOUTHEAST LOUISIANA
  ST. JOHN THE BAPTIST PARISH IN SOUTHEAST LOUISIANA

* UNTIL 345 PM CDT

* AT 310 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR SORRENTO...OR ABOUT 7 MILES SOUTHEAST OF
  GONZALES...MOVING SOUTHEAST AT 10 MPH.

THIS IS A DANGEROUS STORM WITH DAMAGING WINDS...STAY INDOORS AWAY
FROM WINDOWS.

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

LAT...LON 3027 9085 3013 9095 2995 9068 3013 9054

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 24, 2:00 PM CDT, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 24, 2:00 PM CDT, 1 hour 14 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
200 PM CDT WED JUL 24 2002

MODELS SOMEWHAT SIMILAR WITH THE NGM HEAVIEST OF QPF VALUES.  AVN/ETA
MODELS SHOW SHORT WAVE MOVING SOUTH ALONG EASTERN SIDE OF RIDGE AND
DROPPING INTO MISSISSPPI AND SOUTHEAST LOUISIANA THIS AFTERNOON. SEABREEZE
HASNT SET UP THIS AFTERNOON. GOOD OUTFLOW BOUNDAY VISIBLE ON
VISIBLE IMAGERY MOVING AT 20 TO 25 KT FROM SOUTHWEST LOUISISIANA
TOWARDS LAKE PONTCHARTRAIN. ACTIVITY REMAINING BELOW SEVERE LIMITS
BUT THERE REMAINS A CHANCE FOR A FEW MESOS...OOOPS GOT ONE NOW BUT TOO
ELEVATED TO WORRY ABOUT.
WILL KEP CHANCE OD TRWE IN FOR THIS EVENING AND INCREASE POPS TO LIKELY
CATEGORY FOR THURSDAY. AS RIDGE RETROGRADES WEST...ADDITTIONAL SHORT
WAVES ARE AWAITING IN THE WINGS TO DROP INTO THE 850 TROUGH ALONG THE
GULF COAST. DONT SEE ANY CHANGE IN PATTERN TIL THE WEENEND WHEN
RIDGE BUILDS IN FROM THE EAST AND CAPS OFF THE CONVECTION. PRELIMINARY
NUMBERS FOLLOW...WILL SEE IF IFPS SPITS IT OUT CORRECTLY

MCB 72 90 72 91 3634  BTR 73 91 73 91 4624
MSY 76 91 76 91 4634  GPT 75 90 75 90 4634

.NEW...NONE
LA...NONE.
MS...NONE.

In the hours before

Special weather statement, Jul 24, 10:30 AM CDT, 4 hours 44 minutes before

LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-251100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1030 AM CDT WED JUL 24 2002

.SYNOPSIS...AN UPPER LEVEL LOW PRESSURE TROUGH REMAINS NEAR
STATIONARY OVER THE GULF COAST STATES. THIS ALONG WITH AFTERNOON
HEATING WILL AGAIN RESULT IN THE DEVELOPMENT OF SCATTERED SHOWERS
AND THUNDERSTORMS ACROSS THE AREA THIS AFTERNOON AND THIS EVENING.

.THUNDERSTORMS...
SCATTERED THUNDERSTORMS WILL BE MORE NUMEROUS DURING THE AFTERNOON
AND EARLY EVENING HOURS. IN ADDITION TO FREQUENT LIGHTNING...SOME OF
THE STORMS WILL PRODUCE HEAVY DOWNPOURS OF RAIN AND GUSTY WINDS.
ISOLATED SEVERE THUNDERSTORMS WILL BE CAPABLE OF PRODUCING DAMAGING
WINDS.

.ACTIONS...
NONE AT THIS TIME.

FOR MORE INFORMATION...VISIT OUR WEB SITE AT WWW.SRH.NOAA.GOV/LIX
(ALL LOWER CASE).

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 4:12 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	33 min
Jul 24, 6:36 PM CDT	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Baton Rouge, West Feliciana	24 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2002 Every severe thunderstorm warning in 2002

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.