Alert archive / Louisiana / Severe Thunderstorm Warnings in 2005
Severe Thunderstorm Warning 177, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Aug 17, 2005, 4:10 PM CDT for Saint James Parish, Louisiana. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2005, 4:10 PM CDT (21:10 UTC)
- Expired
- Aug 17, 2005, 5:15 PM CDT
- In force
- 65 min
- Issued by
- NWS New Orleans, LA
- Area
- Counties, with a storm outline in the text
County Saint James Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 9.2 hours before the alert went out and 108 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.
- Mixed-layer CAPE
- 1313 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1130 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 17, 2:48 PM CDT, 1 hour 22 minutes earlier.
Area forecast discussion, Aug 17, 2:48 PM CDT, 1 hour 22 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW ORLEANS LA 248 PM CDT WED AUG 17 2005 .DISCUSSION... EARLY THIS AFTERNOON THERE WAS AN UPPER-LEVEL TROUGH DRIFTING WESTWARD ALONG THE MISSISSIPPI AND SOUTHEAST LOUISIANA GULF COAST. THIS WAS BRINGING SCATTERED TO NUMEROUS THUNDERSTORMS TO THE PCWA. THE TROUGH WILL MOVE WEST OF THE AREA TOMORROW. BEHIND THE TROUGH A RIDGE OF HIGH PRESSURE WILL MOVE ACROSS THE CENTRAL GULF COAST. THE ACCOMPANYING SUBSIDENCE WILL LEAD TO LOWER POPS ACROSS THE REGION. THIS COUPLED WITH HIGHS IN THE MID-UPPER 90S AND HIGH HUMIDITY WILL LEAD TO HEAT INDICES IN THE 105-110 RANGE THROUGH THE WEEKEND. THE RIDGE WILL WEAKEN EARLY NEXT WEEK AS A SURFACE FRONT DROPS INTO THE SOUTHEASTERN STATES...BRINGING POPS BACK TOWARD CLIMATOLOGY. && .PRELIMINARY POINT TEMPS/POPS... MCB 73 93 74 95 / 30 40 20 20 BTR 74 95 76 96 / 30 40 20 20 MSY 77 94 78 94 / 30 30 20 20 GPT 75 93 76 93 / 30 40 20 20 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. GM...NONE. MS...NONE. GM...NONE. && 25
Hazardous weather outlook, Aug 17, 11:00 AM CDT, 5 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT WED AUG 17 2005 LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-181230- AMITE-ASCENSION-ASSUMPTION-EAST BATON ROUGE-EAST FELICIANA-HANCOCK- HARRISON-IBERVILLE-JACKSON-LIVINGSTON-LOWER JEFFERSON- LOWER LAFOURCHE-LOWER PLAQUEMINES-LOWER ST BERNARD-LOWER TERREBONNE- ORLEANS-PEARL RIVER-PIKE-POINTE COUPEE-ST CHARLES-ST HELENA-ST JAMES- ST JOHN THE BAPTIST-ST TAMMANY-TANGIPAHOA-UPPER JEFFERSON- UPPER LAFOURCHE-UPPER PLAQUEMINES-UPPER ST BERNARD-UPPER TERREBONNE- WALTHALL-WASHINGTON-WEST BATON ROUGE-WEST FELICIANA-WILKINSON- 1100 AM CDT WED AUG 17 2005 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL AND SOUTHEAST LOUISIANA AND EXTREME SOUTHWEST...SOUTH CENTRAL AND COASTAL MISSISSIPPI. .DAY ONE...THIS AFTERNOON AND TONIGHT WIDESPREAD THUNDERSTORMS WILL OCCUR THROUGH THIS EVENING. AN UPPER LEVEL LOW AND DAYTIME HEATING WILL COMBINE TODAY TO MAKE THE ENVIRONMENT A FAVORABLE FOR STRONG THUNDERSTORMS. AN ISOLATED SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS ALSO WILL BE POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SCATTERED THUNDERSTORMS ARE EXPECTED THURSDAY. MOST OF THE THUNDERSTORM ACTIVITY WILL REMAIN WEAK...BUT A FEW LOCALLY STRONG THUNDERSTORMS ARE POSSIBLE. FRIDAY THROUGH SUNDAY...ONLY ISOLATED THUNDERSTORMS ARE EXPECTED. MONDAY AND TUESDAY WILL SEE SCATTERED THUNDERSTORMS ONCE AGAIN. HEAT INDEX VALUES WILL LIKELY BE IN THE 105 TO 110 DEGREE RANGE TOWARD THE END OF THIS WEEK AS HIGH PRESSURE BUILDS IN AND THUNDERSTORM COVERAGE BECOMES LOW. .SPOTTER INFORMATION STATEMENT... THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS AND EMERGENCY MANAGEMENT PERSONNEL...IN SUPPORT OF SEVERE WEATHER OPERATIONS...IS NOT REQUESTED AT THIS TIME.
In the hours before
Special weather statement, Aug 17, 3:27 PM CDT, 43 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 327 PM CDT WED AUG 17 2005 LAZ059-065-172130- UPPER LAFOURCHE-UPPER TERREBONNE- 327 PM CDT WED AUG 17 2005 ...STRONG THUNDERSTORM ARE AFFECTING SECTIONS OF NORTHERN LAFOURCHE AND TERREBONNE PARISHES... AT 320 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF MODERATE TO STRONG THUNDERSTORM MOVING SLOWLY WEST-NORTHWEST ACROSS THE NORTHERN SECTIONS OF LAFOURCHE AND TERREBONNE PARISHES. THE STRONGEST THUNDERSTORMS WERE APPROACHING THE THIBODAUX...SHRIEVER AND HOUMA AREAS. THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT CLOUD TO GROUND LIGHTNING...WIND GUSTS OF 30 TO 40 MPH...SMALL HAIL...AND HEAVY DOWNPOURS OF RAIN. LOCALIZED FLOODING OF LOW LYING AREAS AND ROADWAYS WILL BE POSSIBLE WITH THIS THUNDERSTORM. 8
Local storm report, Aug 17, 3:42 PM CDT, 28 minutes before
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</html>The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 7:45 AM CDT | Special Marine Warning | LIX | 60 min | |
| Aug 17, 4:25 PM CDT | Tornado Warning | LIX | Saint Tammany | 50 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2005Every severe thunderstorm warning in 2005
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.