Alert archive / Louisiana / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 80, NWS New Orleans, LA

May 29, 2010Lafourche Parish, Saint James Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 29, 2010, 4:40 PM CDT for Lafourche Parish, 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: May 29, 2010, 4:40 PM CDT (21:40 UTC)
Expired: May 29, 2010, 5:45 PM CDT
In force: 65 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Lafourche Parish, LA, Saint James Parish, LA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 29, 12:34 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.7 hours before the alert went out and 102 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: 1799 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 898 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: -10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

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 May 29, 4:40 PM CDT, 0 minutes earlier.

Area forecast discussion, May 29, 4:40 PM CDT, 0 minutes before

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Hazardous weather outlook, May 29, 12:01 PM CDT, 4 hours 39 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1201 PM CDT SAT MAY 29 2010

GMZ530-550-555-570-575-LAZ034>040-046>050-056>070-MSZ068>071-077-
080>082-301715-
LAKE PONTCHARTRAIN AND LAKE MAUREPAS-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM-
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER OUT 20 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA FROM 20 TO 60 NM-
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER FROM 20 TO 60 NM-POINTE COUPEE-WEST FELICIANA-
EAST FELICIANA-ST. HELENA-TANGIPAHOA-WASHINGTON-ST. TAMMANY-
IBERVILLE-WEST BATON ROUGE-EAST BATON ROUGE-ASCENSION-LIVINGSTON-
ASSUMPTION-ST. JAMES-ST. JOHN THE BAPTIST-UPPER LAFOURCHE-
ST. CHARLES-UPPER JEFFERSON-ORLEANS-UPPER PLAQUEMINES-
UPPER ST. BERNARD-UPPER TERREBONNE-LOWER TERREBONNE-
LOWER LAFOURCHE-LOWER JEFFERSON-LOWER PLAQUEMINES-
LOWER ST. BERNARD-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER-
HANCOCK-HARRISON-JACKSON-
1201 PM CDT SAT MAY 29 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF COASTAL WATERS
OF SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI...SOUTHEAST
LOUISIANA AND SOUTHERN MISSISSIPPI.

.DAY ONE...THIS AFTERNOON AND TONIGHT

...SEVERE THUNDERSTORMS...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH THIS
EVENING ACROSS MUCH OF THE OUTLOOK AREA. THE MAIN RISK FROM
ISOLATED SEVERE THUNDERSTORMS WILL BE DAMAGING WIND GUSTS TO 60
MPH...QUARTER SIZE HAIL...AND FREQUENT CLOUD TO GROUND LIGHTNING.

...HEAVY RAINFALL AND FLASH FLOODING...
A FLASH FLOOD WATCH IS IN EFFECT UNTIL 9 PM FOR AREAS SOUTH OF A
LINE FROM NEAR DONALDSONVILLE TO LAKE PONTCHARTRAIN...INCLUDING
METROPOLITAN NEW ORLEANS AND THE SOUTHEAST LOUISIANA COASTAL
COMMUNITIES. SLOW MOVING THUNDERSTORMS ARE VERY LIKELY TO CAUSE
LOCALLY HEAVY RAINFALL. ISOLATED RAINFALL AMOUNTS IN EXCESS OF 5
INCHES WILL BE POSSIBLE IN AREAS THAT SEE MULTIPLE STORMS.

...RIVER FLOODING...
MINOR FLOODING CONTINUES ALONG THE MISSISSIPPI RIVER NEAR RED
RIVER LANDING...AND ALONG THE ATCHAFALAYA RIVER NEAR MORGAN CITY.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO AFFECT THE
AREA EACH AFTERNOON AND EARLY EVENING...MOST NUMEROUS ON SUNDAY.
ORGANIZED SEVERE WEATHER IS NOT EXPECTED. HOWEVER...A FEW STORMS
MAY APPROACH SEVERE LEVELS WITH WIND GUSTS OF 40 TO 50 MPH...SMALL
HAIL...FREQUENT CLOUD TO GROUND LIGHTNING...AND VERY HEAVY RAIN.

RIVER FLOODING...
MINOR FLOODING OF THE MISSISSIPPI RIVER NEAR RED RIVER LANDING
AND THE ATCHAFALAYA RIVER NEAR MORGAN CITY WILL CONTINUE THROUGH
AT LEAST THE MIDDLE OF NEXT WEEK. PLEASE REFER TO THE LATEST RIVER
FLOOD STATEMENTS AND FORECASTS FOR ADDITIONAL DETAILS.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL IN SUPPORT OF SEVERE WEATHER
OPERATIONS MAY BE NECESSARY TODAY.

22/TD

In the hours before

Special weather statement, May 29, 3:35 PM CDT, 1 hour 5 minutes before

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Special weather statement, May 29, 3:55 PM CDT, 45 minutes before

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Special weather statement, May 29, 4:04 PM CDT, 36 minutes before

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Special weather statement, May 29, 4:16 PM CDT, 24 minutes before

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Local storm report, May 29, 4:20 PM CDT, 20 minutes before

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Special weather statement, May 29, 4:20 PM CDT, 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
May 28, 7:14 PM CDT	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Terrebonne	31 min
May 28, 7:25 PM CDT	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	30 min
May 28, 8:55 PM CDT	Special Marine Warning	LIX		35 min
May 28, 9:09 PM CDT	Special Marine Warning	LIX		36 min
May 28, 9:18 PM CDT	Special Marine Warning	LIX		42 min
May 28, 9:25 PM CDT	Special Marine Warning	LIX		35 min
May 28, 9:42 PM CDT	Special Marine Warning	LIX		18 min
May 28, 9:58 PM CDT	Special Marine Warning	LIX		62 min
May 28, 11:01 PM CDT	Special Marine Warning	LIX		29 min
May 28, 11:24 PM CDT	Special Marine Warning	LIX		66 min
May 29, 12:14 AM CDT	Special Marine Warning	LIX		61 min
May 29, 1:20 AM CDT	Special Marine Warning	LIX		25 min
May 29, 1:41 AM CDT	Special Marine Warning	LIX		64 min
May 29, 2:40 AM CDT	Special Marine Warning	LIX		65 min
May 29, 3:41 AM CDT	Special Marine Warning	LIX		79 min
May 29, 4:57 AM CDT	Special Marine Warning	LIX		63 min
May 29, 11:29 AM CDT	Flash Flood Watch	LIX	Assumption, Saint Bernard, Saint James, Saint John the Baptist	10 hr
May 29, 1:20 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines	25 min
May 29, 1:45 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines	45 min
May 29, 2:22 PM CDT	Special Marine Warning	LIX		113 min
May 29, 2:43 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Plaquemines	47 min
May 29, 2:56 PM CDT	Severe Thunderstorm Warning	LIX	Lafourche	21 min
May 29, 3:02 PM CDT	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	43 min
May 29, 3:21 PM CDT	Flash Flood Warning	LIX	Jefferson, Plaquemines	74 min
May 29, 3:35 PM CDT	Special Marine Warning	LIX		25 min
May 29, 4:10 PM CDT	Severe Thunderstorm Warning	LIX	Plaquemines	22 min
May 29, 4:13 PM CDT	Special Marine Warning	LIX		2 hr
May 29, 4:27 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	63 min
May 29, 4:33 PM CDT	Special Marine Warning	LIX		57 min
May 29, 4:48 PM CDT	Special Marine Warning	LIX		57 min
May 29, 5:04 PM CDT	Severe Thunderstorm Warning	LIX	Saint James	41 min
May 29, 5:28 PM CDT	Special Marine Warning	LIX		62 min
May 29, 6:07 PM CDT	Special Marine Warning	LIX		53 min
May 28, 8:54 PM CDT	Severe Thunderstorm Warning	LIX	Harrison, Jackson	50 min
May 29, 1:38 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	37 min
May 29, 2:11 PM CDT	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	34 min
May 29, 5:20 PM CDT	Areal Flood Advisory	LIX	Hancock, Harrison, Jackson	3 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2010 Every severe thunderstorm warning in 2010

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.