Alert archive / Louisiana / Special Weather Statements in 2015
Special Weather Statement, NWS New Orleans, LA
NWS New Orleans, LA issued this special weather statement at Oct 31, 2015, 12:13 PM CDT for Ascension Parish, Louisiana. It was in force for 47 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
- Oct 31, 2015, 12:13 PM CDT (17:13 UTC)
- Expired
- Oct 31, 2015, 1:00 PM CDT
- In force
- 47 min
- Issued by
- NWS New Orleans, LA
County Ascension Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 5.2 hours before the alert went out and 127 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 847 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 292 m²/s²
- 0-3 km storm-relative helicity
- 361 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Oct 31, 11:55 AM CDT, 18 minutes earlier.
Area forecast discussion, Oct 31, 11:55 AM CDT, 18 minutes before
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</html>Hazardous weather outlook, Oct 31, 11:18 AM CDT, 55 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1118 AM CDT SAT OCT 31 2015 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>082-010430- 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- 1118 AM CDT SAT OCT 31 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST LOUISIANA...SOUTH MISSISSIPPI AND THE ADJACENT COASTAL WATERS. .DAY ONE...THIS AFTERNOON AND TONIGHT NUMEROUS TO WIDESPREAD SHOWERS AND EMBEDDED THUNDERSTORMS ARE EXPECTED LATER THIS AFTERNOON THROUGH THIS EVENING. WIDESPREAD 3 TO 5 INCHES OF RAIN IS ANTICIPATED WITH LOCALLY HIGHER AMOUNTS POSSIBLY APPROACHING 8 INCHES THROUGH SUNDAY. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR THE ENTIRE OUTLOOK AREA. OVERALL THE AREA DRAINED FAIRLY WELL AFTER THE SYSTEM LAST WEEKEND...BUT MANY RIVERS AND TRIBUTARIES ALONG WITH TIDES ARE STILL RUNNING QUITE HIGH. THIS COULD LEAD TO MANY LOW LYING AREAS RESPONDING QUICKLY TO THE RAINFALL RUNOFF...LEADING TO SOME FLASH FLOODING. IN ADDITION TO THE RAINFALL THREAT...THERE IS A SLIGHT RISK FOR SEVERE WEATHER ACROSS MUCH OF THE AREA WITH THE REMAINDER OF THE AREA IN A MARGINAL RISK. ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE MAINLY THIS AFTERNOON AND POSSIBLY INTO THE EARLY EVENING HOURS. THE MAIN CONCERN FROM SEVERE STORMS WILL BE ISOLATED WEAK...BUT QUICK SPIN UP TORNADOES. DAMAGING WIND GUSTS WILL ALSO BE POSSIBLE. THE SEVERE RISK WILL GREATLY DIMINISH HEADING INTO SATURDAY EVENING. RIVERS LEVELS CONTINUE TO FALL AT THIS TIME...BUT WITH THE ADDITIONAL RAINFALL MOST WILL STOP FALLING AND MANY COULD REVERSE AND POSSIBLY APPROACH FLOOD STAGE AGAIN. THE GREATEST CONCERN WOULD BE THE AMITE...COMITE...TICKFAW...TANGIPAHOA...BOGUE CHITTO...AND POSSIBLY THE COASTAL MISSISSIPPI DRAINAGE CHANNELS. ONE LAST CONCERN WILL BE MINOR COASTAL FLOODING. TIDES CONTINUE TO RUN ABOUT A FOOT ABOVE NORMAL AND COULD BE AS MUCH AS 1.5 TO JUST UNDER 2 FEET ABOVE NORMAL. A COASTAL FLOOD STATEMENT HAS BEEN ISSUED FOR ALL COASTAL ZONES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NUMEROUS TO WIDESPREAD SHOWERS AND A FEW EMBEDDED THUNDERSTORMS ARE EXPECTED SUNDAY MORNING TO SUNDAY AFTERNOON. A FLASH FLOOD WATCH WILL REMAIN IN EFFECT FOR THE OUTLOOK AREA THROUGH SUNDAY. ANOTHER ROUND OF HEAVY RAINFALL WILL LIKELY EARLY SUNDAY THROUGH SUNDAY AFTERNOON. IF THIS SECOND PERIOD OF RAINFALL OCCURS OVER THE AREA THAT SEES THE GREATEST VALUES ON SATURDAY...THEN THE FLASH FLOODING AND RIVER FLOODING RISK WILL INCREASE. MINOR COASTAL FLOODING WILL BE AN ISSUE AROUND ASTRONOMICAL HIGH TIDE EARLY SUNDAY MORNING. TIDES ARE EXPECTED TO RUN ABOUT A FOOT ABOVE NORMAL AND COULD BE AS MUCH AS 1.5 TO JUST UNDER 2 FEET ABOVE NORMAL THROUGH EARLY SUNDAY MORNING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUESTED TODAY. CAB
In the hours before
Special weather statement, Oct 31, 12:13 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1213 PM CDT SAT OCT 31 2015
LAZ049-056-057-311800-
ASSUMPTION LA-ASCENSION LA-ST. JAMES LA-
1213 PM CDT SAT OCT 31 2015
...SPECIAL WEATHER STATEMENT...
AT 1212 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
OVER BELLE ROSE...OR OVER DONALDSONVILLE...MOVING NORTHEAST AT 40
MPH.
WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH THIS STORM. WEAK
ROTATION IS SHOWING UP ON RADAR SO WILL NEED TO WATCH THIS STORM
CLOSELY TO SEE IF INTENSIFIES.
LOCATIONS IMPACTED INCLUDE...
GONZALES...DONALDSONVILLE...SORRENTO...BELLE ROSE AND GEISMER.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 700 PM CDT FOR SOUTHEASTERN
LOUISIANA.
LAT...LON 3006 9111 3009 9111 3034 9093 3017 9071
2999 9103 3006 9110
TIME...MOT...LOC 1712Z 220DEG 33KT 3008 9104
CABThe office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 31, 4:02 AM CDT | Small Craft Advisory | LIX | 15 hr | |
| Oct 31, 11:46 AM CDT | River Flood Warning | LIX | Saint Tammany | 54 hr |
| Oct 31, 12:28 PM CDT | Tornado Warning | LIX | Ascension, Livingston | 32 min |
| Oct 31, 12:39 PM CDT | Tornado Warning | LIX | Pointe Coupee | 36 min |
| Oct 31, 1:17 PM CDT | Special Weather Statement | LIX | Livingston | 43 min |
| Oct 31, 1:21 PM CDT | Tornado Warning | LIX | Livingston | 24 min |
| Oct 31, 1:33 PM CDT | Tornado Warning | LIX | Tangipahoa | 42 min |
| Oct 31, 1:35 PM CDT | Tornado Warning | LIX | Saint Tammany, Washington | 40 min |
| Oct 31, 1:38 PM CDT | Special Weather Statement | LIX | East Baton Rouge | 22 min |
| Oct 31, 1:43 PM CDT | Severe Thunderstorm Warning | LIX | East Feliciana | 32 min |
| Oct 31, 1:55 PM CDT | Tornado Warning | LIX | Tangipahoa | 35 min |
| Oct 31, 2:03 PM CDT | Tornado Warning | LIX | East Baton Rouge, Livingston, Saint Helena | 27 min |
| Oct 31, 2:22 PM CDT | Tornado Warning | LIX | Saint Helena | 23 min |
| Oct 31, 2:45 PM CDT | Severe Thunderstorm Warning | LIX | Tangipahoa, Washington | 60 min |
| Oct 31, 3:05 PM CDT | Tornado Warning | LIX | Tangipahoa | 25 min |
| Oct 31, 3:23 PM CDT | Severe Thunderstorm Warning | LIX | Washington | 37 min |
| Oct 31, 3:29 PM CDT | Tornado Warning | LIX | Saint Tammany, Washington | 31 min |
| Oct 31, 4:02 PM CDT | Areal Flood Warning | LIX | East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena, West Baton Rouge | 3 hr |
| Oct 31, 4:17 PM CDT | Special Marine Warning | LIX | 58 min | |
| Oct 31, 5:28 PM CDT | Special Marine Warning | LIX | 47 min | |
| Oct 31, 11:09 AM CDT | River Flood Warning | LIX | Pearl River | 57 hr |
| Oct 31, 11:09 AM CDT | River Flood Warning | LIX | Pearl River | 60 hr |
| Oct 31, 12:51 PM CDT | Special Weather Statement | LIX | Wilkinson | 24 min |
| Oct 31, 2:06 PM CDT | Tornado Warning | LIX | Amite, Pike | 24 min |
| Oct 31, 2:36 PM CDT | Tornado Warning | LIX | Pike, Walthall | 39 min |
| Oct 31, 4:07 PM CDT | Severe Thunderstorm Warning | LIX | Pearl River | 23 min |
| Oct 31, 4:13 PM CDT | Tornado Warning | LIX | Pearl River | 32 min |
| Oct 31, 4:44 PM CDT | Tornado Warning | LIX | Pearl River | 31 min |
| Oct 31, 6:14 PM CDT | Special Weather Statement | LIX | Jackson | 46 min |
Nearby
Special Weather Statements in Louisiana, 2015Every special weather statement in 2015
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.