1:31:06:01:00
SECURITE
WEATHER BULLETIN FOR SHIPPING - METAREA 6-
2026-08-18, 12:00 UTC.
NATIONAL WEATHER SERVICE
SEA ICE AND ICEBERGS ISSUED BY SHN
PRESSURE HPA
BEAUFORT SCALE WINDS.
PART 1 GALE WARNING:
WARNING 383: STRONG BARIC GRADIENT PROVOKES WINDS FORCE 8 FROM SECTOR W WITH
GUST IN FIN DEL MUNDO COASTS UNTIL 19/0600
WARNING 382: STRONG BARIC GRADIENT PROVOKES WINDS FORCE 8 WITH GUST BETWEEN
35S-40S AND 40W-20W UNTIL 19/0600
PART 2 GENERAL SYNOPSIS AT 09:00UTC
LOW 1000HPA 45S 31W MOV SE DPN EXTENDS CFNT45S 31W 40S 36W 36S 45W MOV SE EXP
39S 20W 33S 29W 33S 29W 31S 38W BY 19/1200 ASOCIATED WITH OFNT AT 45S 31W 49S
43W 43S 41W
STATIONARY FRONT 33S 52W 35S 48W
HIGH 1026HPA 37S 64W MOV NE NC EXP 34S 58W BY 19/1200
171400 UTC 1.SEA ICE LIMIT 5547S 02000W 5416S 02618W 5352S 03217W 5617S 03757W
5825S 04316W 5953S 04814W 6047S 05247W 6215S 05654W 6338S 06032W 6135S 06337W
6213S 06558W 6233S 06716W 2.ICEBERGS GREATER THAN 10NM D33B 6148S 05427W 21X12NM
A81 5901S 05108W 28X25NM A76C 5247S 03022W 16X6NM A83 6108S 05033W 12X7NM
3.ICEBERGS SMALLER THAN 10NM D33C 6116S 05212W 9X5NM ICEBERG1 6027S 05119W 5X3NM
ICEBERG2 6119S 05400W 5X3NM ICEBERG3 6124S 05331W 6X4NM 4.ICEBERGS AREA A5804S
02000W 4557S 02000W 5000S 03000W 5427S 02951W B5427S 02951W 5100S 03000W 5402S
04500W 5914S 04504W C5914S 04504W 5400S 04500W 5900S 05501W 6145S 05500W D6145S
05500W 6001S 05506W 6000S 06716W 6240S 06716W
PART 3 FORECAST ISSUED 12:00 UTC VALID UNTIL 12:00 UTC 2026-08-19
COASTAL AREAS:
INNER RIO DE LA PLATA: SECTOR S 4/5 BACK SECTOR E 4/3 BY 18/1800 PROB OF MIST
DRIZZLE VIS MODERATE
OUTER RIO DE LA PLATA: SECTOR S 5/4 BACK E 3 BY 19/0000 PROB OF DRIZZLE VIS
MODERATE
URUGUAY SOUTH EAST COASTS: SECTOR S 5 WITH GUSTS DECR 3 BY 18/2100 PROB OF
DRIZZLE RAIN VIS MODERATE OCNL POOR
MAR DEL PLATA COASTS(3617S - 3830S): SECTOR S 4/3 VEER SECTOR W BY 19/0600 VIS
GOOD
RINCON BAHIA BLANCA COASTS(3830S - 41S): NW 4/5 VIS GOOD
PENINSULA DE VALDES COASTS(41S - 45S): NW 5/6 WITH GUSTS BACK VRB 3 BY 19/0000
VIS POOR TO GOOD
GOLFO DE SAN JORGE COASTS(45S - 48S): NW 6 WITH GUSTS BACK SECTOR W 5/6 WITH
GUSTS BY 18/1500 VEER VRB 3 BY 19/0300 VIS POOR TO GOOD
SOUTH PATAGONIA COASTS(48S - 54S): SECTOR W 6/5 WITH GUSTS DECR 4/3 BY 19/0600
VIS POOR TO MODERATE
FIN DEL MUNDO COASTS(54S - 55S): SECTOR W 7/8 WITH GUSTS DECR 7/6 WITH GUSTS
BY 19/0600 PROB OF DRIZZLE RAIN SPELLS OF GOOD WEATHER VIS VERY POOR
ISLAS MALVINAS COASTS: NW 6 WITH GUSTS BACK SECTOR W 6/7 WITH GUSTS BY 18/1800
PROB OF ISOL RAIN VIS POOR
OCEANIC AREAS:
NORTH AREA (35S- 40S AND 20W- 55W) E OF 40W: NW 7/8 WITH GUSTS BACK SECTOR W 5/6
WITH GUSTS BY 19/0300 PROB OF RAIN STORMS VIS VERY POOR TO POOR
REST OF THE AREA: SECTOR S 4 LOW PROB OF ISOL RAIN STARTING EVENING IMPR VIS
GOOD
CENTRAL EAST AREA (40S- 50S AND 20W- 40W) N OF 45S: SECTOR W 5/6 WITH GUSTS BACK
SECTOR S 4 BY 19/0600 PROB OF RAIN STORMS IMPR GRADUALLY VIS POOR TO MODERATE
REST OF THE AREA: SECTOR E 5/6 WITH GUSTS BACK SECTOR S 5/3 BY 18/2100 PROB OF
RAIN STARTING NOON IMPR VIS POOR TO MODERATE
CENTRAL WEST AREA (40S- 50S AND 40W- 60W): SECTOR S 5/4 VEER NW 5/6 WITH GUSTS
BY 18/1800 BACK SECTOR W 6/5 WITH GUSTS BY 19/0600 VIS MODERATE OCNL POOR
SOUTH EAST AREA (50S- 60S AND 20W- 40W): SECTOR W 5/6 WITH GUSTS VEER NW 6/7
WITH GUSTS BY 19/0600 PROB OF RAIN STARTING NIGTH VIS POOR
SOUTH WEST AREA (50S- 60S AND 40W- 60W): NW 6/7 WITH GUSTS BACK SECTOR W BY
19/0600 PROB OF MIST FOG PATCHES NXT PROB OFISOL RAIN VIS POOR OCNL VERY POOR
DRAKE AREA (55S- 60S AND 60W- 67W): SECTOR W 6/7 WITH GUSTS PROB OF RAIN NXT
PROB OF RAIN SNOW FALL VIS POOR OCNL VERY POOR
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1:31:06:01:00
SECURITE
WEATHER BULLETIN FOR SHIPPING - METAREA 6-
12:00 UTC 18, AUGUST 2026.
NATIONAL WEATHER SERVICE (NWS)
SEA ICE AND ICEBERGS ISSUED BY SHN PRESSURE HPA BEAUFORT SCALE WINDS
PART 1 GALE WARNING:
1079/2026 STRONG BARIC GRADIENT SOUTHERN PORTION OF DRAKE STRAIT MAR DE LA FLOTA COASTS MOV E DEEPENING PROVOKES WINDS FORCE 8 FROM SECTOR E WITH GUST IN 61S-64S 70W-58W UNTIL 19/1800
1080/2026 STRONG BARIC GRADIENT GERLACHE STRAIT MOV E DEEPENING PROVOKES WINDS FORCE 8 FROM SECTOR E WITH GUST IN 64S-66S 68W-64W UNTIL 19/0300
1081/2026 STRONG BARIC GRADIENT EREBUS Y TERROR GULF MOV E DEEPENING PROVOKES WINDS FORCE 8 FROM SE WITH GUST IN 64S-67S 56W-50W UNTIL 19/0300
1082/2026 STRONG BARIC GRADIENT NORTHERN WEDDELL SEA MOV E INTENSIFYING WILL PROVOKE WINDS FORCE 8 FROM SECTOR E WITH GUST IN 61S-66S 50W-30W FROM 18/1500 UNTIL 19/2100
PART 2 GENERAL SYNOPSIS AT 09:00UTC
LOW 962HPA 62S 67W MOV SE DPN
LOW 969HPA 63S 75W MOV E WKN
HIGH 999HPA 68S 47W MOV E WKN
171400 UTC 1.SEA ICE LIMIT 5547S 02000W 5416S 02618W 5352S 03217W 5617S 03757W 5825S 04316W 5953S 04814W 6047S 05247W 6215S 05654W 6338S 06032W 6135S 06337W 6213S 06558W 6233S 06716W 2.ICEBERGS GREATER THAN 10NM D33B 6148S 05427W 21X12NM A81 5901S 05108W 28X25NM A76C 5247S 03022W 16X6NM A83 6108S 05033W 12X7NM 3.ICEBERGS SMALLER THAN 10NM D33C 6116S 05212W 9X5NM ICEBERG1 6027S 05119W 5X3NM ICEBERG2 6119S 05400W 5X3NM ICEBERG3 6124S 05331W 6X4NM 4.ICEBERGS AREA A5804S 02000W 4557S 02000W 5000S 03000W 5427S 02951W B5427S 02951W 5100S 03000W 5402S 04500W 5914S 04504W C5914S 04504W 5400S 04500W 5900S 05501W 6145S 05500W D6145S 05500W 6001S 05506W 6000S 06716W 6240S 06716W
PART 3 FORECAST ISSUED 12:00 UTC VALID UNTIL 12:00 UTC 2026-08-19
COASTAL AREAS:
SOUTHERN PORTION OF DRAKE STRAIT W OF 60W: NW 7 GUST WITH 8 INTENSITY BACK SECTOR W 7 WITH GUSTS BY 19/0000 PROB OF FOG AND MIST IN PATCHES PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER DURING THE NIGTH VIS VERY POOR TO MODERATE
SOUTHERN PORTION OF DRAKE STRAIT REST OF THE AREA: NW 7 GUST WITH 8 INTENSITY VEER SECTOR N 5 WITH GUSTS BY 19/0000 PROB OF FOG AND MIST IN PATCHES PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER DURING THE EVENING VIS VERY POOR TO MODERATE
MAR DE LA FLOTA COASTS W OF 60W: SECTOR E 9 WITH GUSTS VEER SE 7/5 WITH GUSTS BY 18/2100 PROB OF FOG AND MIST IN PATCHES PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER DURING THE EARLY MORNING VIS VERY POOR TO MODERATE
MAR DE LA FLOTA COASTS REST OF THE AREA: SECTOR E 7/8 GUST WITH 9 INTENSITY VEER SE 8/6 WITH GUSTS BY 18/2100 PROB OF FOG AND MIST IN PATCHES PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER TOWARDS THE END OF THE PERIOD VIS VERY POOR TO MODERATE
GERLACHE STRAIT : SECTOR E 7/8 WITH GUSTS BACK NE 5/4 BY 19/0300 PROB OF MIST PROB OFISOL SNOW FALL SPELLS OF GOOD WEATHER DURING THE EARLY MORNING VIS MODERATE TO GOOD
MARGARITA BAY : SECTOR E 5/6 GUST WITH 8 INTENSITY BACK NE 5/4 WITH GUSTS BY 19/0600 PROB OF MIST VIS MODERATE TO GOOD
EREBUS Y TERROR GULF : SE 6/5 WITH GUSTS VEER SECTOR S 7 GUST WITH 8 INTENSITY BY 19/0300 PROB OF FOG AND MIST IN PATCHES BLIZZARD PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER TOWARDS THE END OF THE PERIOD VIS VERY POOR TO MODERATE
OCEANIC AREAS:
NORTHER BELLINGSHAUSEN SEA N OF 64S: SECTOR S 6/7 WITH GUSTS VEER SW 7 GUST WITH 8 INTENSITY BY 19/0000 PROB OF MIST PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER DURING THE EVENING VIS POOR TO MODERATE
NORTHER BELLINGSHAUSEN SEA REST OF THE AREA: SECTOR E 5/4 WITH GUSTS VEER SW 5/6 BY 19/0300 PROB OF MIST PROB OFINTERMITTENT SNOW FALL SPELLS OF GOOD WEATHER DURING THE EVENING VIS POOR TO MODERATE
SOUTHERN BELLINGSHAUSEN SEA (66-73S 70-90W): SECTOR E 3/4 VEER SECTOR S 3/4 BY 19/0300 PROB OF FOG AND MIST IN PATCHES PROB OFISOL SNOW FALL WORSENING STARTING NOON VIS GOOD TO MODERATE OCNL VERY POOR
NORTHERN WEDDELL SEA N OF 64S: SW 6 WITH GUSTS BACK SECTOR E 7 WITH GUSTS BY 18/1800 PROB OF FOG AND MIST IN PATCHES PROB OFINTERMITTENT SNOW FALL WORSENING TOWARDS NOON VIS MODERATE TO VERY POOR
NORTHERN WEDDELL SEA REST OF THE AREA: SECTOR S 5/7 WITH GUSTS BACK SE 6/5 BY 18/2100 PROB OF MIST PROB OFINTERMITTENT SNOW FALL IMPR TOWARDS NOON VIS MODERATE TO GOOD
SOUTHERN WEDDELL SEA (68-78S 20-60W): SECTOR E 4/5 WITH GUSTS VEER SE 5/6 BY 18/2100 PROB OF MIST VIS MODERATE TO GOOD=