Marine Weather Net

Altamaha Sound to Fernandina Beach FL Marine Forecast


TONIGHT

NE
WINDS
20
KNOTS

THURSDAY

NE
WINDS
20 - 25
KNOTS

THURSDAY NIGHT

N
WINDS
25 - 30
KNOTS

FRIDAY

N
WINDS
25 - 30
KNOTS

The Marine Weather Forecast In Detail:
AMZ450 Forecast Issued: 313 PM EST Wed Feb 19 2020

SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EST THIS EVENING THROUGH LATE THURSDAY NIGHT
Tonight...Northeast Winds Around 20 Knots. Seas 4 To 6 Feet With Occasional Seas Up To 8 Feet. Dominant Period 5 Seconds. Inland Waters Choppy. A Chance Of Showers.
Thursday...North Northeast Winds 20 To 25 Knots With Gusts To Around 35 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 9 Feet. Dominant Period 7 Seconds. Inland Waters Choppy. Showers.
Thursday Night...North Winds 25 To 30 Knots With Gusts To Around 40 Knots. Seas 7 To 10 Feet With Occasional Seas Up To 13 Feet. Dominant Period 7 Seconds. Inland Waters Rough. Showers.
Friday...North Winds 25 To 30 Knots With Gusts To Around 40 Knots. Seas 8 To 11 Feet With Occasional Seas Up To 14 Feet. Dominant Period 8 Seconds. Inland Waters Very Rough. A Chance Of Showers.
Friday Night...North Northeast Winds 25 To 30 Knots. Seas 8 To 11 Feet With Occasional Seas Up To 14 Feet. Dominant Period 10 Seconds. Inland Waters Rough.
Saturday...North Northeast Winds 15 To 20 Knots. Seas 6 To 9 Feet With Occasional Seas Up To 11 Feet. Dominant Period 11 Seconds. Inland Waters Choppy. A Slight Chance Of Showers.
Saturday Night...Northeast Winds 10 To 15 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 9 Feet.
Sunday...East Northeast Winds 5 To 10 Knots. Seas 4 To 6 Feet With Occasional Seas Up To 8 Feet.
Sunday Night...East Southeast Winds 5 To 10 Knots Becoming South Southeast 10 To 15 Knots After Midnight. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. A Slight Chance Of Showers.
Monday...South Winds 15 To 20 Knots. Seas 4 To 6 Feet With Occasional Seas Up To 8 Feet. Showers Likely.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
313 PM EST Wed Feb 19 2020

A frontal boundary will move southeast across the region Thursday, with strong high pressure building from the northwest Thursday night through Friday. Advisory conditions into Thursday night, then Gales will be possible late Thursday night through Friday night. The high will weaken and build to the north Saturday into Saturday night. The high will build to the northeast Sunday, then east on Monday. A series of frontal boundaries will affect the region Monday night through Wednesday.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Feb 15, 2020 at 1200 UTC...
- 66 nautical miles east of Flagler Beach.
- 75 nautical miles east of Saint Augustine Beach.
- 86 nautical miles east of Jacksonville Beach.
- 99 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
725pm EST Wednesday Feb 19 2020

Near Term
Through Tonight
High pressure will be to the north Tonight, with an inverted trough over the Atlantic coastal waters. An area of low pressure will gather over the central gulf coast region overnight, with a front stretching east from this low into southern GA toward morning. The coastal trough will be responsible for a few overnight showers for the NE FL coast. The front will increase rain chances over SE GA through the night. Temperatures will trend above normal Tonight.

.Short Term
/Thursday through Sunday/... Low pressure will move east along frontal boundary over southern GA early Thursday, with boundary then moving south as a cold front through the day, reaching a line from JAX to GNV during the afternoon. The front will move south of the region Thursday evening. Showers will be located along and behind this boundary, with a fairly high chance Thursday into Thursday night. A pretty extreme temperature gradient across forecast area expected Thursday due to this front, with highs ranging from the lower 50s north to the lower 80s South. The highs across interior SE GA may be in the morning Thursday, with near to slowly falling readings through the day. Strong high pressure will then build from the northwest Thursday night into Friday. Strong north flow will result from this pattern with very gusty winds along the coast. The high will weaken into Saturday, as it builds more overhead. A much cooler than normal airmass will be in place Thursday night through Saturday night. Freezing and sub freezing readings will be common away from the coast Friday night. The high will move toward the northeast Sunday. With the high to the northeast, the flow will become more east southeast, allowing temperatures to moderate back closer to seasonal averages.

.Long Term.../Sunday night through Wednesday/... High pressure will be east of the region Sunday night through Monday. Moderating temperatures with showers expected into Monday. A cold front will move southeast into the region and stall Monday night into Tuesday. A stronger secondary front will move in from the northwest Wednesday. Scattered to numerous showers Monday night through Wednesday. Temperatures will be near normal Tuesday into Wednesday.

Marine
A frontal boundary will move southeast across the region Thursday, with strong high pressure building from the northwest Thursday night through Friday. The high will weaken and build to the north Saturday into Saturday night. The high will build to the northeast Sunday, then east on Monday. A series of frontal boundaries will affect the region Monday night through Wednesday.

Rip Currents...Moderate Risk Thursday, with elevated risk through the weekend.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...Small Craft Advisory from 6pm Thursday to 3am EST Friday for Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM-Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM.

Small Craft Advisory until 3am EST Friday for Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM-Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM.