Alert archive / Louisiana / Special Weather Statements in 2014

Special Weather Statement, NWS New Orleans, LA

December 27, 2014Washington Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Dec 27, 2014, 2:21 PM CST for Washington Parish, Louisiana. It was in force for 54 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
Dec 27, 2014, 2:21 PM CST (20:21 UTC)
Expired
Dec 27, 2014, 3:15 PM CST
In force
54 min
Issued by
NWS New Orleans, LA

County Washington Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.4 hours before the alert went out and 62 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.

Skew-T log-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2014-12-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2014-12-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 309 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
451 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
309 m²/s²
0-3 km storm-relative helicity
351 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Dec 27, 1:40 PM CST, 41 minutes earlier.

Area forecast discussion, Dec 27, 1:40 PM CST, 41 minutes before
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Hazardous weather outlook, Dec 27, 4:42 AM CST, 9 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
442 AM CST SAT DEC 27 2014

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>082-272245-
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-
442 AM CST SAT DEC 27 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
LOUISIANA...SOUTH MISSISSIPPI AND THE ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

A FLOOD WATCH IS IN EFFECT THROUGH TONIGHT. A SLOW MOVING STORM
SYSTEM WILL BRING AN EXTENDED PERIOD OF MODERATE TO OCCASIONALLY
HEAVY RAIN TO SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI
TODAY...CONTINUING OVERNIGHT. WIDESPREAD TWO TO FOUR INCH RAIN
AMOUNTS WILL BE POSSIBLE BY SUNDAY MORNING...WITH A FEW LOCALIZED
AREAS RECEVING HIGHER AMOUNTS.

IN ADDITION TO THE HEAVY RAIN THREAT...A FEW THUNDERSTORMS COULD
BECOME STRONG TO MARGINALLY SEVERE THIS AFTERNOON AND
TONIGHT...MAINLY ALONG THE LOUISIANA COAST. THE MAIN THREAT WOULD
BE STRONG WINDS TO 50 TO 60 MPH.

A SMALL CRAFT ADVISORY IS IN EFFECT EARLY THIS MORNING FOR MUCH
OF THE COASTAL WATERS FOR SOUTHERLY WINDS AND DANGEROUS SEAS.
SMALL CRAFT SHOULD EXERCISE CAUTION ON THE LAKES AND SOUNDS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

A FLOOD WATCH WILL CONTINUE THROUGH SUNDAY AFTERNOON. STORM TOTAL
RAINFALL ACCUMULATIONS WILL AVERAGE BETWEEN 3 AND 5 INCHES ACROSS
THE WATCH AREA BY SUNDAY EVENING WITH SOME LOCALLY HIGHER AMOUNTS
6 TO 10 INCHES POSSIBLE. WITH RECENT RAINFALL AND DORMANT
VEGETATION THERE COULD BE EXCESS RUNOFF LEADING TO A FEW FLOODING
CONCERNS ALONG WITH POSSIBLE RIVER FLOODING ISSUES.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL IN SUPPORT OF SEVERE WEATHER
OPERATIONS IS NOT ANTICIPATED THROUGH FRIDAY.

In the hours before

Special weather statement, Dec 27, 9:31 AM CST, 4 hours 50 minutes before
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Special weather statement, Dec 27, 10:10 AM CST, 4 hours 11 minutes before
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Special weather statement, Dec 27, 10:43 AM CST, 3 hours 38 minutes before
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Special weather statement, Dec 27, 2:21 PM CST, 0 minutes before
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The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 27, 8:26 AM CSTRiver Flood WarningLIXSaint Tammany5 days
Dec 27, 8:30 AM CSTRiver Flood WarningLIXSaint Tammany11 days
Dec 27, 9:18 AM CSTRiver Flood WarningLIXTangipahoa64 hr
Dec 27, 9:31 AM CSTSpecial Weather StatementLIXAscension, East Baton Rouge, Iberville, Livingston, Tangipahoa, West Baton Rouge59 min
Dec 27, 9:49 AM CSTSmall Craft AdvisoryLIX5 hr
Dec 27, 10:43 AM CSTSpecial Weather StatementLIXWashington62 min
Dec 27, 3:37 PM CSTSpecial Weather StatementLIXSaint John the Baptist53 min
Dec 27, 4:32 PM CSTSpecial Weather StatementLIXSaint Tammany88 min
Dec 27, 10:10 AM CSTSpecial Weather StatementLIXJackson65 min

Nearby

Special Weather Statements in Louisiana, 2014Every special weather statement in 2014

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.