Alert archive / Mississippi / Special Weather Statements in 2016

Special Weather Statement, NWS New Orleans, LA

July 20, 2016Walthall County, Mississippi

NWS New Orleans, LA issued this special weather statement at Jul 20, 2016, 1:22 PM CDT for Walthall County, Mississippi. It was in force for 23 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 20, 2016, 1:22 PM CDT (18:22 UTC)
Expired: Jul 20, 2016, 1:45 PM CDT
In force: 23 min
Issued by: NWS New Orleans, LA

County Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.4 hours before the alert went out and 103 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 877 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1149 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

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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 20, 12:15 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Jul 20, 12:15 PM CDT, 1 hour 7 minutes before

Area Forecast Discussion
National Weather Service New Orleans LA
1215 PM CDT WED JUL 20 2016

.AVIATION...

Less convective activity is expected today as a strong upper level
ridge suppresses overall instability. Some widely scattered
thunderstorms may affect KMCB...KHDC...KASD...and KGPT this
afternoon, and have placed VCTS wording in the forecast for these
terminals. Outside of the convective threat, all of these
terminals will see VFR conditions prevail through the entire
forecast.  All of the other terminals should see VFR conditions
prevail through tomorrow afternoon. There will be variability in
wind direction for terminals closer to the lake and coast due to
seabreeze/landbreeze cycles. 32

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  76  96  75  95 /  10  20  10  30
BTR  77  96  77  95 /  10  30  10  30
ASD  78  94  78  94 /  10  20  10  30
MSY  79  95  79  94 /  10  20  10  20
GPT  78  93  78  92 /  10  20  10  30
PQL  74  93  74  92 /  10  20  10  30

&&

.LIX Watches/Warnings/Advisories...
LA...None.
GM...None.
MS...None.
GM...None.
&&

32

Hazardous weather outlook, Jul 20, 11:03 AM CDT, 2 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1103 AM CDT WED JUL 20 2016

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>082-210415-
LAKE PONTCHARTRAIN AND LAKE MAUREPAS-MISSISSIPPI SOUND-
LAKE BORGNE-CHANDELEUR SOUND-BRETON SOUND-
COASTAL WATERS FROM PORT FOURCHON LA TO LOWER ATCHAFALAYA RIVER
LA OUT 20 NM-
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO PORT FOURCHON LOUISIANA OUT 20 NM-
COASTAL WATERS FROM BOOTHVILLE LA TO SOUTHWEST PASS OF THE
MISSISSIPPI RIVER OUT 20 NM-
COASTAL WATERS FROM PASCAGOULA MISSISSIPPI TO STAKE ISLAND OUT
20 NM-
COASTAL WATERS FROM PORT FOURCHON LOUISIANA TO LOWER ATCHAFALAYA
RIVER LA FROM 20 TO 60 NM-
COASTAL WATERS FROM SOUTHWEST PASS OF THE MISSISSIPPI RIVER TO
PORT FOURCHON LOUISIANA FROM 20 TO 60 NM-
COASTAL WATERS FROM STAKE ISLAND LA TO SOUTHWEST PASS OF THE
MISSISSIPPI RIVER FROM 20 TO 60 NM-
COASTAL WATERS FROM PASCAGOULA MISSISSIPPI TO STAKE ISLAND
LOUISIANA OUT 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-
1103 AM CDT WED JUL 20 2016

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 WILL BE POSSIBLE TODAY. A FEW
STORMS COULD BRIEFLY BECOME STRONG AND PRODUCE FREQUENT
LIGHTNING...GUSTY WINDS AND LOCALLY HEAVY RAINFALL.

HEAT INDEX READINGS ARE EXPECTED TO RISE TO BETWEEN 102 AND 105
DEGREES DURING THE AFTERNOON.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE EACH
DAY...MAINLY DURING THE AFTERNOON HOURS...WITH THE BEST CHANCES
ON SUNDAY THROUGH TUESDAY. A FEW STORMS EACH DAY COULD BRIEFLY
BECOME STRONG AND PRODUCE FREQUENT LIGHTNING...GUSTY WINDS AND
LOCALLY HEAVY RAINFALL.

THURSDAY THROUGH SATURDAY HIGH TEMPERATURES ARE EXPECTED TO REACH
THE MID 90S WITH HEAT INDEX READINGS BETWEEN 103 AND 108 DEGREES.
A HEAT ADVISORY MAY BE ISSUED...IF NOT...CAUTION SHOULD STILL BE
EMPHASIZED DURING THE HOTTEST PORTION OF EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

32

In the hours before

Local storm report, Jul 20, 9:26 AM CDT, 3 hours 56 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
926 AM CDT WED JUL 20 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0335 PM     MARINE TSTM WIND 16 SSW BURAS            29.12N 89.55W
07/15/2016  M41.00 MPH       GMZ552             LA   AWOS

            36 KNOT/41 MPH WIND GUST MEASURED AT WEST DELTA 27A
            /KDLP/.

0400 PM     MARINE TSTM WIND 24 S VENICE             28.93N 89.41W
07/15/2016  M45.00 MPH       PLAQUEMINES        LA   C-MAN STATION

            39 KNOT/45 MPH WIND GUST MEASURED AT PILOTS STATION EAST
            - SOUTHWEST PASS C-MAN /PSTL1/.

0400 PM     MARINE TSTM WIND 26 S VENICE             28.90N 89.43W
07/15/2016  M39.00 MPH       GMZ552             LA   C-MAN STATION

            34 KNOT/39 MPH WIND GUST MEASURED AT SOUTHWEST PASS C-MAN
            /BURL1/.

0412 PM     MARINE TSTM WIND 24 S VENICE             28.93N 89.41W
07/15/2016  M39.00 MPH       PLAQUEMINES        LA   C-MAN STATION

            34 KNOT/39 MPH WIND GUST MEASURED AT PILOTS STATION EAST
            - SOUTHWEST PASS C-MAN /PSTL1/.

0854 AM     MARINE TSTM WIND 24 S VENICE             28.93N 89.41W
07/16/2016  M43.00 MPH       PLAQUEMINES        LA   C-MAN STATION

            37 KNOT/43 MPH WIND GUST MEASURED AT PILOTS STATION EAST
            - SOUTHWEST PASS C-MAN /PSTL1/.

1205 PM     WATER SPOUT      3 SSW GRAMERCY          30.02N 90.71W
07/17/2016                   ST. JAMES          LA   BROADCAST MEDIA

            MEDIA REPORTS AND VIDEO IMAGERY SHOWED A WATERSPOUT OVER
            THE MISSISSIPPI RIVER. TIME ESTIMATED FROM RADAR.

&&

TEAM LIX

Special weather statement, Jul 20, 1:22 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
122 PM CDT WED JUL 20 2016

MSZ071-201845-
WALTHALL-
122 PM CDT WED JUL 20 2016

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL WALTHALL COUNTY...

AT 121 PM CDT...A STRONG THUNDERSTORM WAS LOCATED NEAR PICKWICK...OR
NEAR KOKOMO. THE STORM IS NEARLY STATIONARY.

WINDS IN EXCESS OF 30 MPH ARE POSSIBLE WITH THIS STORM.

THIS STORM WILL REMAIN OVER MAINLY RURAL AREAS OF EAST CENTRAL
WALTHALL COUNTY.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY CAUSE
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

LAT...LON 3118 9003 3117 9001 3114 9001 3113 9000
      3113 8994 3111 8994 3111 8993 3110 8993
      3109 8992 3108 9005 3123 9004 3123 9003
TIME...MOT...LOC 1821Z 100DEG 2KT 3115 8993

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 3:16 PM CDT	Special Marine Warning	LIX		44 min
Jul 20, 3:30 PM CDT	Special Marine Warning	LIX		30 min
Jul 20, 3:57 PM CDT	Special Marine Warning	LIX		33 min
Jul 20, 4:15 PM CDT	Special Marine Warning	LIX		30 min
Jul 20, 4:16 PM CDT	Special Weather Statement	LIX	Saint Tammany	29 min
Jul 20, 4:41 PM CDT	Special Weather Statement	LIX	Saint Tammany	34 min
Jul 20, 4:42 PM CDT	Special Marine Warning	LIX		33 min
Jul 20, 5:58 PM CDT	Special Weather Statement	LIX	Saint Charles	32 min
Jul 20, 5:59 PM CDT	Special Weather Statement	LIX	West Feliciana	31 min
Jul 20, 2:52 PM CDT	Special Weather Statement	LIX	Pike	23 min
Jul 20, 2:57 PM CDT	Special Weather Statement	LIX	Jackson	63 min
Jul 20, 3:14 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	31 min
Jul 20, 3:29 PM CDT	Special Weather Statement	LIX	Hancock	31 min
Jul 20, 4:13 PM CDT	Special Weather Statement	LIX	Harrison	32 min
Jul 20, 4:35 PM CDT	Special Weather Statement	LIX	Hancock	25 min

Nearby

Special Weather Statements in Mississippi, 2016 Every special weather statement in 2016

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.