Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 17, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Mar 26, 2009, 4:15 AM CDT for Jefferson Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 60 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
- Mar 26, 2009, 4:15 AM CDT (09:15 UTC)
- Expired
- Mar 26, 2009, 5:15 AM CDT
- In force
- 60 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
Counties Jefferson Parish, LA, Plaquemines Parish, LA, Saint Bernard 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 |
|---|---|---|---|
| Mar 26, 1:36 AM CDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 00:00Z, 9.3 hours before the alert went out and 65 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
- 1439 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 723 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 149 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.8
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 Mar 26, 4:01 AM CDT, 14 minutes earlier.
Area forecast discussion, Mar 26, 4:01 AM CDT, 14 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 146 AM CDT THU MAR 26 2009 GMZ530-550-555-570-575-LAZ034>040-046>050-056>070-MSZ068>071-077- 080>082-261100- 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- 146 AM CDT THU MAR 26 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 SEVERE WEATHER... SEVERE THUNDERSTORM ACTIVITY SHOULD CONTINUE EARLY THIS MORNING AS A LINE OF STRONG TO SEVERE THUNDERSTORMS SWEEPS THROUGH THE AREA. HAZARDS ASSOCIATED WITH ANY SEVERE THUNDERSTORMS WILL BE TORNADOES... LARGE HAIL...DAMAGING WINDS...CONTINUOUS LIGHTNING AND VERY HEAVY RAIN. HEAVY RAINFALL... AS THE FRONT STALLS ACROSS THE REGION...THERE IS THE POSSIBILITY OF SOME AREAS RECEIVING UP TO 3 INCHES OF RAIN BY MORNING...MAINLY OVER SOUTHERN MISSISSIPPI AND ADJACENT LOUISIANA PARISHES. IF THIS AMOUNT OF RAIN FALLS IN A SHORT PERIOD OF TIME...MINOR FLOODING OF LOW LYING AREAS AND SOME ROADWAYS WILL OCCUR. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR THE ENTIRE AREA. MARINE HAZARDS... A SMALL CRAFT ADVISORY REMAINS IN EFFECT FOR THE GULF WATERS. PERSISTENT SOUTHEAST WINDS AROUND 20 KNOTS WITH HIGHER GUSTS WILL CONTINUE TO RESULT IN SWELL-ENHANCED SEA HEIGHTS OF 6 TO 9 FEET...MAINLY BEYOND 15 NAUTICAL MILES FROM SHORE. SMALL CRAFT WILL NEED TO EXERCISE CAUTION OVER THE TIDAL LAKES. HIGH TIDES... MODERATE LONG FETCH SOUTHERLY WINDS OVER THE GULF WILL CONTINUE TO KEEP TIDES 1 TO 2 FEET ABOVE NORMAL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY SEVERE WEATHER... SEVERAL PERIODS OF STRONG TO SEVERE THUNDERSTORMS CAN BE EXPECTED THURSDAY THROUGH FRIDAY NIGHT. A FEW OF THESE MAY BE WIDESPREAD SIGNIFICANT EVENTS. THE PERIODS MOST LIKELY TO PRODUCE SEVERE WEATHER WILL BE EARLY THURSDAY MORNING...OVERNIGHT THURSDAY NIGHT INTO FRIDAY MORNING...AND AGAIN FRIDAY NIGHT. THE ROUND FRIDAY NIGHT HAS THE POTENTIAL TO PRODUCE THE MOST WIDESPREAD SEVERE WEATHER. HAZARDS ASSOCIATED WITH THESE SEVERE THUNDERSTORMS WILL BE TORNADOES...LARGE HAIL...DAMAGING WINDS...CONTINUOUS LIGHTNING AND VERY HEAVY RAINFALL. RIVER FLOODING... THE PEARL RIVER REMAINS ABOVE FLOOD STAGE AT BOGALUSA AND AT PEARL RIVER. ADDITIONALLY...THE ATCHAFALAYA RIVER AT MORGAN CITY HAS RISEN TO FLOOD STAGE. REFER TO THE LATEST RIVER FLOOD STATEMENTS FOR INFORMATION. MARINE HAZARDS... SOUTHEASTERLY WINDS WILL CONTINUE TO BRING LARGE SWELL TO THE COASTAL WATERS THROUGH FRIDAY NIGHT. WIND SPEEDS ARE EXPECTED TO CONTINUE AROUND 20 KNOTS CAUSING SEAS TO REMAIN FROM 6 TO 9 FEET. A STRONG COLD FRONT IS FORECAST TO MOVE THROUGH THE COASTAL WATERS SATURDAY MORNING. SMALL CRAFT ADVISORIES WILL LIKELY CONTINUE THROUGH SATURDAY. COASTAL FLOODING...SOUTHEAST WINDS WILL CAUSE TIDES TO REMAIN 1 TO 2 FEET ABOVE NORMAL THROUGH FRIDAY NIGHT. ASTRONOMICAL TIDES WILL BE AT THEIR HIGHEST FRIDAY AROUND NOON. THE STRONGEST WINDS OVER THE GULF WATERS WILL COME JUST AHEAD OF THE COLD FRONT FRIDAY AND FRIDAY NIGHT CAUSING TIDES TO BE 2 FEET OR MORE ABOVE NORMAL LEVELS. FOR THIS REASON...ANOTHER COASTAL FLOOD WATCH MAY BE ISSUED BEFORE FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS REQUESTED AT THIS TIME. SPOTTERS...EMERGENCY MANAGERS AND FIRST RESPONDERS SHOULD MONITOR THE LATEST FORECASTS AND STATEMENTS FOR UPDATED INFORMATION ON MULTIPLE SIGNIFICANT WEATHER THREATS THROUGH EARLY SATURDAY. 32
In the hours before
Local storm report, Mar 26, 1:58 AM CDT, 2 hours 17 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
158 AM CDT THU MAR 26 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0105 AM TSTM WND DMG BATON ROUGE 30.45N 91.13W
03/26/2009 EAST BATON ROUGE LA PUBLIC
LARGE LIMBS DOWN. RECEIVED VIA WEB STORM REPORT ENTRY.
&&
RICKSLocal storm report, Mar 26, 2:30 AM CDT, 1 hour 45 minutes before
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</html>Local storm report, Mar 26, 2:34 AM CDT, 1 hour 41 minutes before
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</html>Local storm report, Mar 26, 2:36 AM CDT, 1 hour 39 minutes before
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</html>Local storm report, Mar 26, 2:37 AM CDT, 1 hour 38 minutes before
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</html>Local storm report, Mar 26, 4:07 AM CDT, 8 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 |
|---|---|---|---|---|
| Mar 25, 11:56 PM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, Pointe Coupee, West Feliciana | 64 min |
| Mar 26, 12:08 AM CDT | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana | 67 min |
| Mar 26, 12:43 AM CDT | Severe Thunderstorm Warning | LIX | East Feliciana, Saint Helena, Tangipahoa, Washington | 62 min |
| Mar 26, 1:14 AM CDT | Severe Thunderstorm Warning | LIX | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberville, Livingston and 7 more | 61 min |
| Mar 26, 1:46 AM CDT | Severe Thunderstorm Warning | LIX | Saint Helena, Tangipahoa, Washington | 59 min |
| Mar 26, 1:49 AM CDT | Special Marine Warning | LIX | 116 min | |
| Mar 26, 2:13 AM CDT | Tornado Warning | LIX | Saint Tammany, Tangipahoa, Washington | 32 min |
| Mar 26, 2:19 AM CDT | Severe Thunderstorm Warning | LIX | Ascension, Jefferson, Livingston, Saint Charles, Saint James, Saint John the Baptist and 3 more | 56 min |
| Mar 26, 3:02 AM CDT | Severe Thunderstorm Warning | LIX | Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist, Terrebonne | 58 min |
| Mar 26, 3:12 AM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Saint Charles | 63 min |
| Mar 26, 3:29 AM CDT | Coastal Flood Watch | LIX | Saint Bernard, Saint John the Baptist | 26 hr |
| Mar 26, 4:09 AM CDT | Special Marine Warning | LIX | 2 hr | |
| Mar 26, 6:17 AM CDT | Special Marine Warning | LIX | 118 min | |
| Mar 26, 7:09 AM CDT | Special Marine Warning | LIX | 2 hr | |
| Mar 26, 7:37 AM CDT | Areal Flood Advisory | LIX | Ascension, Lafourche, Livingston, Saint Tammany, Tangipahoa, Terrebonne | 98 days |
| Mar 26, 1:40 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa | 23 min |
| Mar 26, 6:38 PM CDT | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 67 min |
| Mar 26, 6:46 PM CDT | Tornado Warning | LIX | Pointe Coupee, West Feliciana | 29 min |
| Mar 26, 3:30 AM CDT | Tornado Warning | LIX | Pearl River | 15 min |
| Mar 26, 4:02 AM CDT | Severe Thunderstorm Warning | LIX | Hancock | 43 min |
| Mar 26, 5:20 AM CDT | Severe Thunderstorm Warning | LIX | Jackson | 55 min |
| Mar 26, 9:42 AM CDT | River Flood Warning | LIX | Jackson | 13 days |
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.