Alert archive / Louisiana / Special Weather Statements in 2015

Special Weather Statement, NWS New Orleans, LA

July 7, 2015Ascension Parish, Louisiana

NWS New Orleans, LA issued this special weather statement at Jul 7, 2015, 5:21 PM CDT for Ascension Parish, Louisiana. It was in force for 39 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
Jul 7, 2015, 5:21 PM CDT (22:21 UTC)
Expired
Jul 7, 2015, 6:00 PM CDT
In force
39 min
Issued by
NWS New Orleans, LA

County Ascension Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 10.4 hours before the alert went out and 235 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, Jackson, MS at 12:00Z on 2015-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1362 joules per kilogram.LCLLFCEL10008507005003002001001 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, Jackson, MS at 12:00Z on 2015-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 square meters per square second.193958Sfc1 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
1362 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
845 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
30 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 Jul 7, 3:10 PM CDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jul 7, 3:10 PM CDT, 2 hours 11 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
310 PM CDT TUE JUL 7 2015

.SYNOPSIS...

HIGH PRESSURE CENTER REMAINS OVER THE EASTERN GULF OF MEXICO THIS
AFTERNOON. UPPER RIDGING IS NOT QUITE AS STRONG AS IT HAS BEEN
OVER THE LAST SEVERAL DAYS. ISOLATED SHOWERS AND THUNDERSTORMS
HAVE DEVELOPED ACROSS WESTERN PORTIONS OF THE CWA THIS AFTERNOON.
TEMPERATURES AT MID AFTERNOON ARE GENERALLY IN THE UPPER 80S AND
LOWER 90S WITH DEW POINTS IN THE MID 70S.

&&

.SHORT TERM...

EXPECT MOST OF CURRENT CONVECTION TO DISSIPATE PRIOR TO SUNSET.
BERMUDA HIGH SURGES WESTWARD AGAIN OVER THE WEEKEND...CENTERING
ITSELF OVER TEXAS BY SATURDAY. STILL SEE THE OPPORTUNITY FOR
ISOLATED TO SCATTERED CONVECTION EACH DAY AS THE CONVECTIVE
TEMPERATURE IS REACHED. THURSDAY AND FRIDAY APPEAR TO BE THE DAYS
THIS WILL MOST EASILY BE REACHED...AND HAVE GONE WITH CHANCE POPS
FOR THOSE DAYS. TEMPERATURES GENERALLY IN THE LOWER 90S. HEAT
INDEX READINGS GENERALLY IN THE 100-105 RANGE. 35

&&

.LONG TERM...

MEDIUM RANGE MODELS IN SOMEWHAT REASONABLE AGREEMENT THROUGH AT
LEAST MONDAY. NO LARGE SCALE FEATURES TO FORCE CONVECTIVE
DEVELOPMENT...AND DO NOT SEE ANY REASON TO GO MUCH HIGHER THAN 20
PERCENT ON POPS THROUGH THE EXTENDED FORECAST PERIOD. EXPECT
TEMPERATURES TO CREEP A LITTLE HIGHER INTO THE LOWER AND MID 90S
FOR HIGHS. WILL NEED TO MONITOR HUMIDITIES FOR POTENTIAL HEAT
ADVISORIES...AS CURRENT FORECAST HAS SOME HEAT INDEX READINGS NEAR
105 FOR SUNDAY AND MONDAY. 35

&&

.AVIATION...

EXPECT VFR TO MVFR CIGS OVER THE AREA THIS EVENING. A FEW SHOWERS
HAVE DEVELOPED OVER THE WESTERN PORTIONS OF THE FORECAST AREA AND
HAVE INCLUDED VCTS AT KBTR THROUGH THE AFTERNOON AND EVENING. SOME
PATCHY FOG IS POSSIBLE IN SOME TERMINALS AND ARE REFLECTED IN
TAFS. EXPECT MORE OF THE SAME CONDITIONS TOMORROW. 13/MH

&&

.MARINE...

BERMUDA RIDGE TO MAINTAINS LIGHT SOUTHERLY FLOW OVER THE COASTAL
WATERS THROUGH THE FORECAST PERIOD. ANY THUNDERSTORMS THAT DEVELOP
OVER THE NEXT SEVERAL DAYS WILL BE ISOLATED. WINDS AND SEAS SHOULD
CONTINUE TO BE ON THE LOWER END OF THINGS AROUND 10 KNOTS OR LESS
AND SEAS AROUND 2 FEET. 13/MH

&&

.DECISION SUPPORT...

DSS CODE....BLUE.
DEPLOYED...NONE.
ACTIVATION...NONE.
ACTIVITIES...RIVER FLOOD WARNINGS ON MISSISSIPPI RIVER FROM RED
             RIVER LANDING TO BATON ROUGE.

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 RISK SVR AND/OR DIRECT
         TROPICAL THREATS; EVENTS OF NATIONAL SIGNIFICANCE

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  75  92  73  92 /  10  20  10  20
BTR  76  92  75  92 /  10  20  10  30
ASD  78  92  76  91 /   0  10  10  30
MSY  79  92  78  91 /   0  10  10  30
GPT  78  90  78  90 /   0  10  10  30
PQL  76  91  75  90 /   0  10  10  30

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...NONE.
GM...NONE.
MS...NONE.
GM...NONE.
&&
Hazardous weather outlook, Jul 7, 11:47 AM CDT, 5 hours 34 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1147 AM CDT TUE JUL 7 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>082-080500-
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-
1147 AM CDT TUE JUL 7 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

HEAT INDEX VALUES COULD BRIEFLY RISE TO THE 102 TO 105 DEGREE
RANGE BY THIS LATE WEEKEND INTO EARLY NEXT WEEK. WILL HAVE TO
MONITOR THE FORECAST TO SEE IF A HEAT ADVISORY WILL BE NEEDED
EARLY NEXT WEEK.

ISOLATED AFTERNOON THUNDERSTORMS ARE POSSIBLE EACH DAY. ORGANIZED
SEVERE STORMS ARE NOT EXPECTED THROUGH MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

In the hours before

Special weather statement, Jul 7, 4:16 PM CDT, 1 hour 5 minutes before
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Local storm report, Jul 7, 4:24 PM CDT, 57 minutes before
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Special weather statement, Jul 7, 4:39 PM CDT, 42 minutes before
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Special weather statement, Jul 7, 4:44 PM CDT, 37 minutes before
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Special weather statement, Jul 7, 5:21 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 4:39 PM CDTSpecial Weather StatementLIXEast Baton Rouge, West Baton Rouge51 min
Jul 7, 5:27 PM CDTSpecial Weather StatementLIXEast Feliciana33 min
Jul 7, 6:14 PM CDTSpecial Weather StatementLIXSaint Helena31 min
Jul 7, 6:44 PM CDTSpecial Weather StatementLIXTangipahoa46 min
Jul 7, 4:16 PM CDTSpecial Weather StatementLIXWilkinson44 min
Jul 7, 4:44 PM CDTSpecial Weather StatementLIXWilkinson46 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.