Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 180, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Oct 16, 2009, 1:22 AM CDT for Lafourche Parish, Saint Charles Parish, Louisiana. It was in force for 38 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
- Oct 16, 2009, 1:22 AM CDT (06:22 UTC)
- Expired
- Oct 16, 2009, 2:00 AM CDT
- In force
- 38 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
Counties Lafourche Parish, LA, Saint Charles Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 6.4 hours before the alert went out and 89 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
- 3175 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 930 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 8.0
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 Oct 15, 11:46 PM CDT, 1 hour 36 minutes earlier.
Area forecast discussion, Oct 15, 11:46 PM CDT, 1 hour 36 minutes before
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</html>Hazardous weather outlook, Oct 15, 7:00 PM CDT, 6 hours 22 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 700 PM CDT THU OCT 15 2009 GMZ530-550-555-570-575-LAZ034>040-046>050-056>070-MSZ068>071-077- 080>082-161200- PASCAGOULA TO SW PASS MISSISSIPPI RIVER OUT 20 NM- PASCAGOULA TO SW PASS MISSISSIPPI RIVER 20-60 NM OUT- SW PASS MISSISSIPPI RIVER TO ATCHAFALAYA RIVER OUT 20 NM- SW PASS MISSISSIPPI RIVER TO ATCHAFALAYA RIVER 20-60 NM OUT-AMITE- ASCENSION-ASSUMPTION-EAST BATON ROUGE-EAST FELICIANA-HANCOCK- HARRISON-IBERVILLE-JACKSON-LAKES PONTCHARTRAIN AND MAUREPAS- 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- 700 PM CDT THU OCT 15 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF COASTAL WATERS OF SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI...SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI. .DAY ONE...TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT FOR ALL OF COASTAL AND SOUTHWEST MISSISSIPPI AS WELL AS PORTIONS OF SOUTHEAST LOUISIANA NORTH OF THE INTERSTATE 10/12 CORRIDOR. A MORE GENERAL RISK OF STRONG THUNDERSTORMS EXISTS OVER THE REMAINDER OF SOUTHEAST LOUISIANA THROUGH TONIGHT. MOST OF THESE THUNDERSTORMS SHOULD REMAIN BELOW SEVERE LIMITS...BUT AN ISOLATED SEVERE THUNDERSTORM WILL BE POSSIBLE. THESE THUNDERSTORMS COULD PRODUCE FREQUENT LIGHTNING STRIKES...HEAVY DOWNPOURS...AND STRONG GUSTY WINDS IN EXCESS OF 45 MPH. SOME PONDING OF WATER IN LOW LYING AND POOR DRAINAGE AREAS CAN BE EXPECTED WITH THE HEAVIER DOWNPOURS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY STRONG NORTHERLY WINDS IN THE WAKE OF THE COLD FRONT WILL RESULT IN HAZARDOUS SEAS AND WAVES ACROSS THE TIDAL LAKES AND COASTAL WATERS EARLY FRIDAY MORNING THROUGH EARLY SUNDAY AFTERNOON. THERE COULD BE FREQUENT GUSTS EXCEEDING GALE FORCE LATE SATURDAY AFTERNOON AND SATURDAY NIGHT. A SMALL CRAFT ADVISORY IS IN EFFECT FROM FRIDAY INTO SUNDAY MORNING FOR ALL OF THE COASTAL WATERS AND TIDAL LAKES ...AND A GALE WARNING MAY BE NECESSARY ON SATURDAY AND SATURDAY NIGHT ACROSS THE GULF COASTAL WATERS. NO HAZARDOUS WEATHER IS EXPECTED MONDAY THROUGH WEDNESDAY. .SPOTTER INFORMATION STATEMENT... THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND EMERGENCY MANAGEMENT PERSONNEL IN SUPPORT OF SEVERE WEATHER OPERATIONS...MAY BE NEEDED TONIGHT...BUT OTHERWISE IS NOT EXPECTED THROUGH NEXT WEDNESDAY. 32
In the hours before
Special weather statement, Oct 15, 8:15 PM CDT, 5 hours 7 minutes before
LAZ039-160200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 815 PM CDT THU OCT 15 2009 ...CLUSTER OF STRONG THUNDERSTORMS MOVING SOUTHEAST AFFECTING WASHINGTON PARISH... AT 815 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS 8 MILES NORTHEAST OF FRANKLINTON... MOVING SOUTHEAST AT 25 MPH. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...ANGIE...VARNADO AND BOGALUSA THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING AND WIND GUSTS 35 TO 45 MPH...WHICH COULD DOWN TREE LIMBS AND BLOW AROUND UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE HOME OR BUILDING UNTIL THESE STORMS HAVE PASSED. THESE STORMS COULD PRODUCE RAINFALL AMOUNTS OF ONE TO TWO INCHES IN A SHORT PERIOD OF TIME...RESULTING IN PONDING OF WATER AROUND LOW LYING ROADWAYS. REMEMBER...DO NOT DRIVE YOUR VEHICLE INTO WATER COVERED ROADWAYS. THE DEPTH MAY BE TOO GREAT TO ALLOW A SAFE CROSSING. FREQUENT LIGHTNING IS OCCURRING WITH THESE STORMS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
Special weather statement, Oct 15, 9:42 PM CDT, 3 hours 40 minutes before
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</html>Special weather statement, Oct 15, 10:31 PM CDT, 2 hours 51 minutes before
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</html>Local storm report, Oct 15, 11:11 PM CDT, 2 hours 11 minutes before
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</html>Local storm report, Oct 15, 11:13 PM CDT, 2 hours 9 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 |
|---|---|---|---|---|
| Oct 15, 8:11 PM CDT | Areal Flood Advisory | LIX | East Feliciana, Saint Helena | 2 hr |
| Oct 15, 8:34 PM CDT | Severe Thunderstorm Warning | LIX | Washington | 34 min |
| Oct 15, 8:46 PM CDT | Flash Flood Warning | LIX | Washington | 3 hr |
| Oct 15, 9:52 PM CDT | Special Marine Warning | LIX | 53 min | |
| Oct 15, 10:42 PM CDT | Special Marine Warning | LIX | 48 min | |
| Oct 16, 12:03 AM CDT | Special Marine Warning | LIX | 57 min | |
| Oct 16, 12:58 AM CDT | Special Marine Warning | LIX | 62 min | |
| Oct 16, 2:49 AM CDT | Special Marine Warning | LIX | 56 min | |
| Oct 16, 3:42 AM CDT | Severe Thunderstorm Warning | LIX | Assumption | 48 min |
| Oct 16, 7:40 AM CDT | River Flood Warning | LIX | Saint Tammany | 24 hr |
| Oct 16, 11:36 AM CDT | River Flood Warning | LIX | Saint Tammany | 13 days |
| Oct 15, 7:24 PM CDT | Areal Flood Advisory | LIX | Pearl River | 111 min |
| Oct 15, 8:20 PM CDT | Areal Flood Advisory | LIX | Amite, Wilkinson | 115 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2009Every severe thunderstorm warning in 2009
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.