1:31:06:01:00
SECURITE
WEATHER BULLETIN FOR SHIPPING - METAREA 6-
2026-04-18, 12:00 UTC.
NATIONAL WEATHER SERVICE
SEA ICE AND ICEBERGS ISSUED BY SHN
PRESSURE HPA
BEAUFORT SCALE WINDS.
PART 1 GALE WARNING:
WARNING 165: STRONG BARIC GRADIENT WILL PROVOKE WINDS FORCE 8 FROM SECTOR S WITH
GUST IN PENINSULA DE VALDES COASTS GOLFO DE SAN JORGE COASTS SOUTH PATAGONIA
COASTS FROM 19/0000
WARNING 161: STRONG BARIC GRADIENT PROVOKES WINDS FORCE 8 FROM SECTOR E WITH
GUST BETWEEN 40S-45S AND 20W-30W UNTIL 18/2100
PART 2 GENERAL SYNOPSIS AT 09:00UTC
171400 UTC 1.SEA ICE LIMIT 6840S 02000W 6828S 02729W 6327S 03132W 6009S 03309W
6059S 03952W 6217S 05036W 6337S 05311W 6313S 05740W 6339S 06042W 6431S 06416W
6601S 06544W 6644S 06716W 2.ICEBERGS GREATER THAN 10NM A76C 5911S 03550W 16X7NM
3.ICEBERGS SMALLER THAN 10NM ICEBERG1 4623S 02749W 6X3NM ICEBERG2 4848S 03004W
5X3NM ICEBERG3 4629S 02736W 4X2NM ICEBERG4 4656S 02738W 3X1NM ICEBERG5 5825S
03611W 3X1NM ICEBERG6 4319S 03357W 2X1NM 4.ICEBERGS AREA A6859S 02000W 4124S
02000W 4307S 03613W 6507S 03625W B6107S 03625W 4305S 03613W 6002S 05503W 6328S
05500W C6328S 05500W 6002S 05503W 6445S 06716W 6638S 06716W
HIGH 1030HPA 50S 21W MOV SE WKN EXTENDS RIDGE AT 50S 21W 48S 38W 44S 54W MOV E
EXP 51S 20W 52S 38W 42S 43W BY 19/1200
LOW 1001HPA 36S 50W MOV E WKN EXP 36S 44W BY 19/1200 EXTENDS CFNT AT 33S 44W 40S
50W MOV E EXP 40S 47W 35S 40W BY 19/1200 ASOCIATED WITH OFNT AT 40S 50W 39S 54W
35S 53W
LOW 1004HPA 35S 31W MOV SE DPN EXP 42S 28W BY 19/1200 EXTENDS CFNT AT 40S 24W
35S 21W MOV SE EXP 45S 25W 40S 21W 35S 20W BY 19/1200 ASOCIATED WITH OFNT AT 40S
24W 41S 33W 35S 35W
PART 3 FORECAST ISSUED 12:00 UTC VALID UNTIL 12:00 UTC 2026-04-19
COASTAL AREAS:
INNER RIO DE LA PLATA: SECTOR W 3/4 VEER SECTOR N PROB OF FOG AND MIST IN
PATCHES TEMPORARILY DISSIPATING VIS GOOD OCNL POOR
OUTER RIO DE LA PLATA: SECTOR W 3/4 PROB OF FOG AND MIST IN PATCHES TEMPORARILY
DISSIPATING VIS GOOD OCNL POOR
URUGUAY SOUTH EAST COASTS: SW 5/4 PROB OF COASTAL FOG AND MIST IN PATCHES
TEMPORARILY DISSIPATING VIS GOOD OCNL POOR
MAR DEL PLATA COASTS(3617S - 3830S): SECTOR S 5/4 VEER SECTOR W PROB OF MIST
STARTING EARLY MORNING PROB OF SH DURING THE NIGTH VIS MODERATE OCNL GOOD
RINCON BAHIA BLANCA COASTS(3830S - 41S): VRB 3 VEER SECTOR N 4 BACK SECTOR S 5
WITH GUSTS PROB OF MIST STARTING EARLY MORNING PROB OF SH STORMS DURING THE
NIGTH VIS GOOD OCNL MODERATE
PENINSULA DE VALDES COASTS(41S - 45S): SECTOR N 4/7 WITH GUSTS BACK SW 8/7
WITH GUSTS PROB OF HVY SH RAIN VIS MODERATE TO POOR OCNL VERY POOR
GOLFO DE SAN JORGE COASTS(45S - 48S): SECTOR N 4/7 WITH GUSTS BACK SW 8/7 WITH
GUSTS PROB OF HVY SH RAIN VIS MODERATE TO POOR OCNL VERY POOR
SOUTH PATAGONIA COASTS(48S - 54S): SECTOR N 4/7 WITH GUSTS BACK SW 8/7 WITH
GUSTS PROB OF HVY SH RAIN VIS MODERATE TO POOR OCNL VERY POOR
FIN DEL MUNDO COASTS(54S - 55S): VRB 4 BACK SECTOR S 5/4 VEER SECTOR W 5 PROB
OF FOG PATCHES DISSIPATING PROB OF SH SPELLS OF GOOD WEATHER VIS GOOD OCNL
MODERATE
ISLAS MALVINAS COASTS: SECTOR N 4 VEER SECTOR S 5/6 WITH GUSTS PROB OF FOG
PATCHES DISSIPATING PROB OF SH RAIN STARTING NIGTH VIS MODERATE TO POOR
OCEANIC AREAS:
NORTH AREA (35S- 40S AND 20W- 55W) E OF 30W: SECTOR N 6/5 WITH GUSTS PROB OF SH
STORMS SPELLS OF GOOD WEATHER VIS POOR OCNL MODERATE
W OF 30W - E OF 40W: SECTOR W 4 PROB OF SH SPELLS OF GOOD WEATHER VIS MODERATE
OCNL GOOD
W OF 50W: SW 7/4 WITH GUSTS PROB OF SH STORMS SPELLS OF GOOD WEATHER VIS POOR
TO MODERATE OCNL GOOD
REST OF THE AREA: NE 6/4 WITH GUSTS PROB OF SH SPELLS OF GOOD WEATHER VIS POOR
TO MODERATE
CENTRAL EAST AREA (40S- 50S AND 20W- 40W) E OF 30W - N OF 45S: SECTOR E 8/6 WITH
GUSTS VEER VRB 5 PROB OF HVY SH RAIN SPELLS OF GOOD WEATHER VIS VERY POOR TO
POOR OCNL MODERATE
W OF 30W: SECTOR E 6/4 WITH GUSTS VEER SECTOR S 4 PROB OF ISOL RAIN SPELLS OF
GOOD WEATHER VIS POOR TO MODERATE OCNL GOOD
REST OF THE AREA: SECTOR E 6/7 WITH GUSTS PROB OF HVY SH RAIN SPELLS OF GOOD
WEATHER VIS POOR OCNL VERY POOR
CENTRAL WEST AREA (40S- 50S AND 40W- 60W) E OF 50W: SECTOR N 4/6 WITH GUSTS PROB
OF SH RAIN SPELLS OF GOOD WEATHER VIS MODERATE OCNL POOR
REST OF THE AREA: SECTOR N 4/5 BACK SECTOR W 6/7 WITH GUSTS PROB OF SH RAIN
SPELLS OF GOOD WEATHER PROB OF FOG PATCHES VIS MODERATE TO POOR
SOUTH EAST AREA (50S- 60S AND 20W- 40W) N OF 55S: SECTOR N 4/5 PROB OF FOG
PATCHES LOW PROB OFISOL RAIN VIS GOOD OCNL POOR
REST OF THE AREA: SECTOR W 6/4 WITH GUSTS BACK SECTOR N 5/6 WITH GUSTS PROB OF
SH FOG PATCHES RAIN SPELLS OF GOOD WEATHER VIS POOR OCNL MODERATE
SOUTH WEST AREA (50S- 60S AND 40W- 60W) E OF 50W: SECTOR N 4/6 WITH GUSTS PROB
OF SH RAIN SPELLS OF GOOD WEATHER VIS MODERATE TO POOR
REST OF THE AREA: SECTOR N 4 VEER SECTOR S 5/6 WITH GUSTS PROB OF SH FOG
PATCHES RAIN SPELLS OF GOOD WEATHER VIS MODERATE TO POOR
DRAKE AREA (55S- 60S AND 60W- 67W): SECTOR N 6 WITH GUSTS VEER SECTOR W 4 WITH
GUSTS PROB OF RAIN SNOW FALL SPELLS OF GOOD WEATHER VIS POOR OCNL MODERATE
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1:31:06:01:00
SECURITE
WEATHER BULLETIN FOR SHIPPING - METAREA 6-
12:00 UTC 18, APRIL 2026.
NATIONAL WEATHER SERVICE (NWS)
SEA ICE AND ICEBERGS ISSUED BY SHN PRESSURE HPA BEAUFORT SCALE WINDS
PART 1 GALE WARNING:
539/2026 STRONG BARIC GRADIENT SOUTHERN PORTION OF DRAKE STRAIT MAR DE LA FLOTA COASTS MOV SE DEEPENING WILL PROVOKE WINDS FORCE 8 FROM SECTOR N GUST WITH 9 INTENSITY IN 60S-64S 62W-50W FROM 18/1800 UNTIL 19/0600
540/2026 STRONG BARIC GRADIENT NORTHERN WEDDELL SEA MOV E DEEPENING PROVOKES WINDS FORCE 9 FROM SECTOR W GUST WITH 9 INTENSITY IN 60S-66S 48W-30W UNTIL 19/0000
PART 2 GENERAL SYNOPSIS AT 09:00UTC
LOW 983HPA 65S 70W MOV SE WKN
LOW 988HPA 63S 88W MOV SE WKN
LOW 980HPA 67S 39W MOV SE WKN
RIDGE 72S 47W 67S 51W 61S 51W MOV E INTSF
PART 3 FORECAST ISSUED 12:00 UTC VALID UNTIL 12:00 UTC 2026-04-19
COASTAL AREAS:
SOUTHERN PORTION OF DRAKE STRAIT W OF 60W: NW 5/4 VEER SECTOR N 4 BY 18/1800 AFTERWARDS NW 3/4 BY 19/0600 PROB OF FOG AND MIST IN PATCHES WORSENING TOWARDS EVENING VIS GOOD TO MODERATE
SOUTHERN PORTION OF DRAKE STRAIT REST OF THE AREA: NW 7 GUST WITH 8 INTENSITY VEER SECTOR N 6/5 WITH GUSTS BY 19/0300 PROB OF MIST PROB OFISOL RAIN AND SNOW MIXTURE WORSENING DURING THE EARLY MORNING VIS GOOD TO MODERATE OCNL POOR
MAR DE LA FLOTA COASTS W OF 60W: NW 5/4 VEER SECTOR N 4 BY 18/1800 AFTERWARDS NW 3/4 BY 19/0600 PROB OF FOG AND MIST IN PATCHES WORSENING TOWARDS EVENING VIS GOOD TO MODERATE
MAR DE LA FLOTA COASTS REST OF THE AREA: NW 7 GUST WITH 8 INTENSITY VEER SECTOR N 6/5 WITH GUSTS BY 19/0300 PROB OF MIST PROB OFISOL RAIN AND SNOW MIXTURE WORSENING DURING THE EARLY MORNING VIS GOOD TO MODERATE OCNL POOR
GERLACHE STRAIT : NE 8 WITH GUSTS VEER SECTOR E 7/5 BY 19/0000 PROB OF MIST PROB OFISOL SNOW FALL WORSENING STARTING EARLY MORNING VIS GOOD TO MODERATE
MARGARITA BAY : NE 5/4 BACK SECTOR N 4 BY 19/0000 PROB OF ISOL SNOW FALL WORSENING DURING THE NOON VIS GOOD TO MODERATE
EREBUS Y TERROR GULF : NW 7/8 WITH GUSTS INCR NW 9 WITH GUSTS BY 18/2100 PROB OF FOG AND MIST IN PATCHES PROB OFISOL SNOW FALL WORSENING DURING THE EVENING VIS GOOD TO MODERATE OCNL POOR
OCEANIC AREAS:
NORTHER BELLINGSHAUSEN SEA N OF 65S: SECTOR W 4/5 VEER SECTOR N 6/7 WITH GUSTS BY 18/2100 PROB OF MIST PROB OFINTERMITTENT RAIN SPELLS OF GOOD WEATHER DURING THE EVENING VIS MODERATE TO GOOD
NORTHER BELLINGSHAUSEN SEA REST OF THE AREA: SECTOR W 5/4 BACK SW 4 BY 18/1800 PROB OF MIST PROB OFISOL SNOW FALL IMPR DURING THE MORNING VIS MODERATE TO GOOD
SOUTHERN BELLINGSHAUSEN SEA (66-73S 70-90W): SECTOR W 4/3 VEER NW 4/5 BY 18/2100 PROB OF MIST PROB OFISOL SNOW FALL IMPR STARTING NIGTH VIS POOR TO MODERATE OCNL GOOD
NORTHERN WEDDELL SEA N OF 65S: SECTOR W 9 WITH GUSTS DECR SECTOR W 7/5 WITH GUSTS BY 18/1800 PROB OF FOG MIST PROB OFISOL RAIN AND SNOW MIXTURE IMPR DURING THE EVENING VIS VERY POOR TO MODERATE
NORTHERN WEDDELL SEA REST OF THE AREA: SECTOR S 4/5 VEER SW 6/5 BY 18/1800 PROB OF FOG AND MIST IN PATCHES PROB OFINTERMITTENT SNOW FALL IMPR DURING THE EVENING VIS VERY POOR TO MODERATE OCNL GOOD
SOUTHERN WEDDELL SEA (68-78S 20-60W): NE 4/3 VEER SECTOR E 4 BY 19/0000 PROB OF MIST PROB OFMOD SNOW FALL SPELLS OF GOOD WEATHER TOWARDS THE END OF THE PERIOD VIS POOR TO MODERATE=