Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 103, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at May 21, 2012, 6:27 PM CDT for 4 parishes in Louisiana. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 21, 2012, 6:27 PM CDT (23:27 UTC)
- Expired
- May 21, 2012, 7:30 PM CDT
- In force
- 63 min
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
Counties East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA
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, 11.5 hours before the alert went out and 114 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
- 620 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1402 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
457 WUUS54 KLIX 212327 SVRLIX LAC033-037-063-091-220030- /O.NEW.KLIX.SV.W.0103.120521T2327Z-120522T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 627 PM CDT MON MAY 21 2012 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN EAST BATON ROUGE PARISH IN SOUTHEAST LOUISIANA... SOUTHEASTERN EAST FELICIANA PARISH IN SOUTHEAST LOUISIANA... NORTHWESTERN LIVINGSTON PARISH IN SOUTHEAST LOUISIANA... SOUTHWESTERN ST. HELENA PARISH IN SOUTHEAST LOUISIANA... * UNTIL 730 PM CDT * AT 625 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 12 MILES NORTHEAST OF WATSON...OR 12 MILES SOUTHEAST OF CLINTON...AND MOVING SOUTHEAST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED PARISHES. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 3058 9063 3057 9097 3076 9095 3078 9079 TIME...MOT...LOC 2327Z 337DEG 5KT 3073 9088 $$ CAB
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 21, 4:05 PM CDT, 2 hours 22 minutes earlier.
Area forecast discussion, May 21, 4:05 PM CDT, 2 hours 22 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
405 PM CDT MON MAY 21 2012
.SYNOPSIS...
LATEST SURFACE ANALYSIS SHOWED A COLD FRONT FROM THE OHIO VALLEY
TO NORTH MISSISSIPPI TO CENTRAL TEXAS. SOUNDING AT 12Z REVEALED A
CAPE VALUE AROUND 3KJ/KG...PRECIPITABLE WATER VALUE NEAR 1.1
INCHES LIGHT NORTHWEST FLOW FROM 1000MB TO 350MB AND 5H TEMP NEAR
-13F. UPPER AIR ANALYSIS CONTINUE TO SHOW NORTHWEST FLOW OVER THE
MISSISSIPPI VALLEY WITH A DISTURBANCE FROM CENTRAL MISSOURI TO
SOUTHERN ARKANSAS.
&&
.DISCUSSION...
COLD FRONT WILL PUSH SOUTHEAST AND MAINTAIN A THREAT OF LATE
AFTERNOON AND EVENING THUNDERSTORMS. DISTURBANCE IS EXPECTED TO
DIVE SOUTHEAST WITH THE BEST PUSH AND FOCUS JUST EAST OF THE AREA.
CURRENT RADAR SHOW ISOLATED STRONG TO SEVERE THUNDERSTORMS
APPROACHING SOUTHWEST AND CENTRAL MISSISSIPPI. THESE STORMS WILL
LIKELY DIVE SOUTHEAST ACROSS THE NORTHERN PARTS OF FORECAST AREA
THIS AFTERNOON AND EVENING WITH HAIL AND WIND DAMAGE POSSIBLE FROM
ONE OR TWO STORMS. RAIN AND CONVECTION THREAT WILL CONTINUE
OVERNIGHT WITH FRONTAL BOUNDARY STALLING ACROSS THE FORECAST AREA
TUESDAY. DRY AIR WILL FILTER IN THE NORTHERN PARTS OF FORECAST
AREA TUESDAY NIGHT WITH WEDNESDAY MORNING LOWS APPROACHING THE
UPPER 50S ACROSS THE NORTH ZONES. FRONTAL BOUNDARY WILL LIKELY
DISSOLVE WEDNESDAY WITH SOUTHWEST MOIST FLOW OVER THE AREA BY
WEDNESDAY AFTERNOON. THE MAIN UPPER LEVEL TROUGH WILL LIFT
NORTHEAST WITH SOUTHWEST FLOW DEVELOPING OVER THE THURSDAY.
FINALLY...A LARGE ANTICYCLONIC CIRCULATION DEVELOPS OVER THE
MISSISSIPPI AND OHIO VALLEY FRIDAY THROUGH NEXT WEEK.
&&
.AVIATION...
EXPECT VFR CONDITIONS TO PREVAIL THROUGH THE LATE AFTERNOON AND
EVENING HOURS. CURRENT RADAR SHOWS SCATTERED SHOWERS AND
THUNDERSTORMS ACROSS SOUTH CENTRAL MISSISSIPPI AND MOVING SOUTHWARD
TOWARDS THE FORECAST AREA. WITH THIS IN MIND HAVE MENTIONED THUNDER
AT MOST TAF SITES THIS EVENING. MAIN CONCERNS WITH STORMS WILL BE
STRONG GUSTY WINDS...LIGHTNING...AND SMALL HAIL. STORMS SHOULD
DECREASE IN INTENSITY AND COVERAGE THIS EVENING. THERE COULD BE
SOME LIGHT FOG AT SOME TERMINALS BUT IT DEPENDS IF THAT AREA
RECEIVES SOME RAIN OR NOT. OTHERWISE TOMORROW SHOULD BE ANOTHER VFR
DAY AT ALL TAF SITES. 13/MH
&&
.MARINE...
A WEAK FRONT WILL APPROACH THE COASTAL WATERS THIS EVENING...STALL
AND DISSIPATE WEDNESDAY. HIGH PRESSURE WILL BUILD OVER THE
COASTAL WATERS WEDNESDAY AND THURSDAY UNTIL IT IS ABSORBED BY
RIDGE OVER THE ENTIRE SOUTHEASTERN US. ONSHORE FLOW RETURN AS
EARLY AS WEDNESDAY AFTERNOON AND GRADUALLY INCREASE FROM WEST TO
EAST THROUGH THE WEEKEND. SEAS OF 3 TO POSSIBLY 4 FOOT MAY DEVELOP
IN THE OUTER WATERS.
&&
DECISION SUPPORT...
DSS CODE...ORANGE...CHEMICAL FIRE IN WEST BATON ROUGE PARISH.
DEPLOYED...NONE.
ACTIVATION...NONE. ACTIVITIES...STRONG THUNDERSTORMS POSSIBLE THIS
AFTERNOON.
DECISION SUPPORT SERVICES (DSS) CODE LEGEND
GREEN = NO WEATHER IMPACTS THAT REQUIRE ACTION
BLUE = LONG FUSED WATCH/WARNING/ADVISORY IN EFFECT OR HIGH
VISIBILITY EVENT
YELLOW = HEIGHTENED IMPACTS WITH SHORT FUSED
WATCH/WARNING/ADVISORY ISSUANCES; RADAR SUPPORT
ORANGE = HIGH IMPACTS - SLIGHT TO MODERATE RISK SEVERE; NEARBY
TROPICAL EVENTS; HAZMAT OR OTHER LARGE EPISODES
RED = FULL ENGAGEMENT FOR MODERATE TO HIGH RISK SVR AND/OR
DIRECT TROPICAL THREATS; EVENTS OF NATIONAL SIGNIFICANCE
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 62 87 56 88 / 20 20 10 10
BTR 66 90 66 90 / 20 20 10 10
ASD 64 89 63 88 / 20 20 10 10
MSY 71 89 71 89 / 20 20 10 10
GPT 66 88 66 87 / 20 20 10 10
PQL 63 89 64 89 / 20 20 10 10
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...NONE.
GM...NONE.
MS...NONE.
GM...NONE.
&&Hazardous weather outlook, May 21, 11:25 AM CDT, 7 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1125 AM CDT MON MAY 21 2012 GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>037- 039-040-046>050-056>072-MSZ068>071-077-080>082-221630- LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND- LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND- COASTAL WATERS FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER OUT 20 NM- COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON OUT 20 NM- COASTAL WATERS FROM BOOTHVILLE LA TO THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER OUT 20 NM- COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA OUT 20 NM- COASTAL WATERS FROM PORT FOURCHON TO LOWER ATCHAFALAYA RIVER FROM 20 TO 60 NM- COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO PORT FOURCHON FROM 20 TO 60 NM- COASTAL WATERS FROM STAKE ISLAND LA TO THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER FROM 20 TO 60 NM- COASTAL WATERS FROM PASCAGOULA MS TO STAKE ISLAND LA FROM 20 TO 60 NM-POINTE COUPEE-WEST FELICIANA-EAST FELICIANA-ST. HELENA- 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-NORTHERN TANGIPAHOA- SOUTHERN TANGIPAHOA-WILKINSON-AMITE-PIKE-WALTHALL-PEARL RIVER- HANCOCK-HARRISON-JACKSON- 1125 AM CDT MON MAY 21 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST LOUISIANA...SOUTH MISSISSIPPI AND THE ADJACENT COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED LATE THIS AFTERNOON AND INTO TONIGHT. A FEW OF THE THUNDERSTORMS COULD BECOME STRONG...PRODUCING GUSTY WINDS AND FREQUENT LIGHTING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED THUNDERSTORMS WILL ALSO BE POSSIBLE ON TUESDAY. SEVERE WEATHER IS NOT EXPECTED. OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
In the hours before
Special weather statement, May 21, 4:31 PM CDT, 1 hour 56 minutes before
LAZ035-MSZ068-212230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 431 PM CDT MON MAY 21 2012 ...CLUSTER OF STRONG THUNDERSTORMS DEVELOPING AND MOVING SOUTHEAST INTO WILKINSON COUNTY...WEST FELICIANA PARISH... AT 430 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS 21 MILES NORTHEAST OF BORDELONVILLE...OR ABOUT 12 MILES NORTH OF FORT ADAMS...MOVING SOUTHEAST AT 15 MPH. THE CLUSTER OF STRONG THUNDERSTORMS ARE BEGINNING TO MOVE INTO WILKINSON AND WILL AFFECT AREAS IN AND AROUND...DOLOROSA...FORT ADAMS...SPILLMAN AND WOODVILLE. THESE STORMS COULD BECOME SEVERE QUICKLY. THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING...PEA TO DIME SIZE HAIL...AND WIND GUSTS TO NEAR 50 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. CAB
Special weather statement, May 21, 5:48 PM CDT, 39 minutes before
LAZ034-046-212330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 548 PM CDT MON MAY 21 2012 ...STRONG THUNDERSTORM MOVING SOUTHEAST AFFECTING POINTE COUPEE PARISH...IBERVILLE PARISH... AT 543 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM NEAR KROTZ SPRINGS...OR ABOUT 4 MILES NORTHWEST OF LOTTIE...MOVING SOUTHEAST AT 20 MPH. THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...LOTTIE... LIVONIA...MARINGOUIN...RAMAH AND GROSSE TETE THE PRIMARY THREAT FROM THIS STORM IS HAIL UP TO NICKEL SIZE. SEEK SHELTER IN A SAFE HOME OR BUILDING UNTIL THIS STORM HAS PASSED.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 6:05 PM CDT | Severe Thunderstorm Warning | LIX | Iberville, Pointe Coupee | 39 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 2012Every severe thunderstorm warning in 2012
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.