An isolated thunderstorm produced one report of quarter size hail.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LIX wrote it up.
An isolated thunderstorm produced one report of quarter size hail.
The local office's own words before the first event, 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 the first event at Apr 21, 12:10 PM CST, 1 hour 41 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE NEW ORLEANS LA 110 PM CDT THU APR 21 2011 .AVIATION... LINE OF TSRA IS BEARING DOWN ON KMCB AND WILL LIKELY PRODUCE A 1-2 HOUR PERIOD OF VSBYS AOB 2 NM...CIGS 020-030...AND WIND GUSTS AS HIGH AS 35 KNOTS. THERE IS LOWER CONFIDENCE THAT THE LINE OF STORMS WILL MAINTAIN ITS STRENGTH OR HOLD TOGETHER AS FAR SOUTH AS KBTR-KASD-KHSA-KGPT...BUT HAVE PLACED A 2 HOUR PERIOD OF VCTS STARTING AT 20Z FOR KBTR AND 21Z FOR THE TAF AIRPORTS TO THE EAST. HAVE LEFT THE SOUTH SHORE AIRPORTS WITH NO MENTION OF SHRA/TSRA THE NEXT 24 HOURS. ANOTHER PERIOD OF MVFR TO IFR IS EXPECTED AGAIN AFTER 06-08Z TONIGHT THROUGH MID MORNING ON FRIDAY MAINLY DUE TO CIGS AND SOME LIGHT VSBY RESTRICTIONS. 22/TD && .PREV DISCUSSION... /ISSUED 1154 AM CDT THU APR 21 2011/ UPDATE... COLD POOL FROM OVERNIGHT CONVECTION OVER ARKANSAS AND MISSISSIPPI HAS BEEN DRIVING CONVECTIVE DEVELOPMENT SOUTHWARD THIS MORNING. THIS CONVECTION HAS REACHED AS FAR SOUTH AS NATCHEZ ALREADY. WITH AN UNSTABLE AIRMASS IN PLACE...ONLY QUESTION REMAINING IS HOW FAR SOUTH WILL CONVECTION DEVELOP. HAVE RAISED PRECIPITATION CHANCES TO CHANCE CATEGORY FROM INTERSTATE 10/12 CORRIDOR NORTHWARD. SPC HAS BROUGHT SLIGHT RISK SOUTHWARD TO MISSISSIPPI-LOUISIANA LINE...WHICH APPEARS REASONABLE BASED ON 12Z SOUNDING DATA. WILL KEEP AREAS SOUTH OF LAKE PONTCHARTRAIN DRY FOR NOW...BUT WILL CONTINUE TO MONITOR. HAVE ALSO CHANGED CLOUD FORECAST FOR TODAY TO MOSTLY CLOUDY AS CUMULUS FIELD IS RATHER EXTENSIVE. UPDATE HAS ALREADY BEEN ISSUED. 35 PREV DISCUSSION... /ISSUED 639 AM CDT THU APR 21 2011/ UPDATE... MADE A QUICK CHANGE TO THE FORECAST TO ADD A SLIGHT CHANCE OF SOME SHOWERS AND A ISOLATED THUNDERSTORM MAINLY IN THE SOUTHWEST MISSISSIPPI COUNTIES AND ALONG THE MISSISSIPPI COAST. BUMPED THE POPS FROM 10 TO 20 DUE TO THE APPROACH OF AN OUTFLOW BOUNDARY AS PREVIOUSLY MENTIONED BEING THE POSSIBLE FOCUS OF SOME ACTIVITY. OTHERWISE...EVEN THOUGH A STRAY SHOWER ELSEWHERE CANNOT BE COMPLETELY RULED OUT THE CHANCES REMAIN VERY LOW AND DID NOT WARRANT ANY OTHER CHANGES TO THE FORECAST. 98/SO PREV DISCUSSION... /ISSUED 317 AM CDT THU APR 21 2011/ SHORT TERM... NOT A LOT OF CHANGE FROM YESTERDAY. THE OUTFLOW BOUNDARY THAT SHOULD HAVE MADE ITS WAY TO THE AREA IS ONLY ONE TIER OF COUNTIES NORTH OF THE CWA. WILL HAVE TO MAINTAIN A SLIGHT CHANCE OF SEEING A TS TODAY MAINLY OVER SOUTHWESTERN MISS. FCAST CURRENTLY SHOWS 10% WHICH SHOULD SUFFICE. THE SAME PROBLEM WILL EXIST TODAY AS DID YESTERDAY...IF A TS IS ABLE TO DEVELOP...IT WILL BE CAPABLE OF BEING SEVERE. WITH LITTLE CHANCE OF INITIATION OF A TS...WILL HOLD CURRENT FCAST AS IS. SFC CONVERGENCE MAY HELP SOME OF US GET SOME RAIN SAT. THE MAIN AREA WILL BE IN SE LA NEAR THE NEW ORLEANS METRO AREA. OTHER THAN TRYING TO SQUEEZE OUT A CHANCE OF RAIN IN THE NEAR TERM...THERE IS LITTLE CHANCE OF ANY SIGNIFIGANT PRECIP IN THE FCAST UNTIL THE LAST DAY...WED. THERE IS SOME DIFFERENCES IN SOLUTIONS THAT FAR OUT BUT WITH A DEEP TROUGH DIGGING FAR ENOUGH SOUTH DURING THIS TIME OF YEAR IT IS HARD TO NOT BELIEVE THERE WOULD NOT BE ANY HAZARDOUS WX ASSOCIATED WITH IT. WILL INTRODUCE THE POSSIBILITY OF STRONG OR SEVERE TS WTIH THIS FRONT BUT WITH A NOTE THAT THINGS MAY DIFFER AS WEL APPROACH THIS SCENARIO. AVIATION... MOSTLY MVFR CONDITIONS THIS MORNING WITH SOME IFR DUE TO CEILINGS. SITES RUN FROM BKN/OVC 500 FT AT KGPT TO SCT 2500 FT AT KMCB. LOCATIONS EXPECTED TO IMPROVE AFTER SUNRISE HOWEVER CEILINGS WILL REMAIN THE ISSUE AS A FRONT PUSHES SOUTH AND STALLS OVER NORTH LOUISIANA AND CENTRAL MISSISSIPPI. WINDS WILL HELP KEEP VISIBILITIES IN CHECK. ONLY OTHER IMPACT COULD BE A VERY ISOLATED SHOWER OR THUNDERSTORMS THAT GETS NEAR AIRPORT LOCATIONS BUT CHANCES REMAIN LOW. MARINE... GRADIENT BETWEEN HIGH PRESSURE CENTERED OVER THE ATLANTIC AND A LOW PRESSURE SYSTEM CENTERED OVER THE UPPER MIDWEST HAS KEPT WINDS UP IN THE COASTAL WATERS. THIS LAMINAR SOUTHERN FLOW WILL BEGIN TO RELAX TODAY. CONCERNED STRONG WINDS WILL PERSIST THOUGH MID MORNING THUS HAVE EXTENDED THE SMALL CRAFT EXERCISE CAUTION THROUGH THE NEXT FORECAST UPDATE. COLD FRONT TO STALL AROUND NORTH LOUISIANA TO CENTRAL MISSISSIPPI. COULD SEE A FEW SHOWERS IN THE COASTAL WATERS BUT CHANCES ARE SLIM. && .PRELIMINARY POINT TEMPS/POPS... MCB 84 68 87 68 / 40 10 10 10 BTR 87 71 88 70 / 30 10 10 10 ASD 86 70 86 69 / 30 10 10 10 MSY 87 71 85 70 / 10 10 10 10 GPT 83 71 82 70 / 30 10 10 10 PQL 84 68 83 69 / 30 10 10 10 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...NONE. GM...NONE. MS...NONE. GM...NONE. &&
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NEW ORLEANS LA 1151 AM CDT THU APR 21 2011 GMZ530-532-534-536-538-550-552-555-557-570-572-575-577-LAZ034>040- 046>050-056>070-MSZ068>071-077-080>082-221700- 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- 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- 1151 AM CDT THU APR 21 2011 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 SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO MOVE INTO EXTREME SOUTHERN PORTIONS OF SOUTHWEST MISSISSIPPI EARLY THIS AFTERNOON. THIS ACTIVITY MAY CONTINUE TO DEVELOP SOUTH INTO PORTIONS OF EAST CENTRAL AND SOUTHEAST LOUISIANA AND SOUTHEAST AND COASTAL MISSISSIPPI THROUGH THE AFTERNOON HOURS...MAINLY ALONG AND NORTH OF INTERSTATE 10 AND LAKE PONTCHARTRAIN. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHWEST MISSISSIPPI AND INLAND SECTIONS OF SOUTHEAST MISSISSIPPI. THE MAIN THREATS FROM ANY SEVERE THUNDERSTORMS ARE DAMAGING WINDS...LARGE HAIL...CLOUD TO GROUND LIGHTNING...AND LOCALLY HEAVY RAINFALL. THUNDERSTORMS ARE EXPECTED TO DISSIPATE BY SUNSET. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A STRONG COLD FRONT IS EXPECTED BY WEDNESDAY OR THURSDAY OF NEXT WEEK. THIS SYSTEM MAY BE CAPABLE OF PRODUCING SEVERE WEATHER BUT TIMING AND PLACEMENT WILL NEED REFINEMENT OVER THE NEXT SEVERAL DAYS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. 22/TD
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</html>MSZ070-071-211945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 208 PM CDT THU APR 21 2011 ...CLUSTER OF STRONG THUNDERSTORMS MOVING EAST AFFECTING NORTHERN PIKE COUNTY...WALTHALL COUNTY... AT 201 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS 8 MILES NORTH OF MCCOMB...OR ABOUT 5 MILES NORTH OF SUMMIT...MOVING EAST TO SOUTHEAST AT 30 MPH. THE CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND...MCCOMB AND SALEM THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING...PEA TO MARBLE SIZE HAIL...AND WIND GUSTS TO NEAR 40 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. BE PREPARED TO TAKE QUICK ACTION IF A WARNING IS ISSUED. STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE LOCAL MEDIA OUTLETS FOR FURTHER DETAILS OR UPDATES FROM THE NATIONAL WEATHER SERVICE. 22/TD
LAZ036-037-212015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NEW ORLEANS LA 232 PM CDT THU APR 21 2011 ...STRONG THUNDERSTORM MOVING EAST AFFECTING ST. HELENA PARISH...EAST FELICIANA PARISH... AT 228 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A STRONG THUNDERSTORM 10 MILES SOUTHWEST OF GREENSBURG...MOVING EAST AT 10 MPH. THE STRONG THUNDERSTORM WILL BE NEAR... GREENSBURG BY 310 PM... MONTPELIER BY 315 PM... THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT LIGHTNING...HAIL UP TO NICKEL SIZE...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 THIS STORM HAS PASSED. BE PREPARED TO TAKE QUICK ACTION IF A WARNING IS ISSUED. STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE LOCAL MEDIA OUTLETS FOR FURTHER DETAILS OR UPDATES FROM THE NATIONAL WEATHER SERVICE. 22/TD
The national radar mosaic for the moment the first event began.
1 hail. Local standard time, as filed.
Hail was falling heavily at times at the fire station on Louisiana Highway 37.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2011Every state in 2011This day in weather historyWarnings in Louisiana, April 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 292609.