Altamaha Sound, GA to Fernandina Beach, FL 20 - 60 NM Marine Forecast
|Tonight...South Winds 10 To 15 Knots Becoming Southwest 5 To 10 Knots Late In The Evening, Then Becoming West After Midnight. Seas 2 To 3 Feet With A Dominant Period 5 Seconds. Chance Of Showers And Thunderstorms.|
|Thursday...West Winds 5 To 10 Knots. Seas 2 Feet With A Dominant Period 5 Seconds. Chance Of Showers And Slight Chance Of Thunderstorms.|
|Thursday Night...Southwest Winds 10 To 15 Knots Becoming Northwest 15 To 20 Knots After Midnight. Seas 2 To 3 Feet With A Dominant Period 3 Seconds. Slight Chance Of Showers And Thunderstorms In The Evening.|
|Friday...Northwest Winds 15 To 20 Knots Diminishing To 10 To 15 Knots In The Afternoon. Seas 3 To 4 Feet.|
|Friday Night...Northwest Winds 10 To 15 Knots. Seas 3 To 4 Feet.|
|Saturday...North Winds 5 To 10 Knots Becoming Northeast In The Afternoon. Seas 2 To 3 Feet.|
|Saturday Night...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet.|
|Sunday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet.|
|Sunday Night...South Winds 15 To 20 Knots. Seas 3 To 4 Feet.|
|Monday...South Winds 10 To 15 Knots. Seas 3 To 4 Feet.|
| AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm|
301 PM EDT Wed May 5 2021
A cold front will slowly move southeast across the area through Thursday with a few strong to severe storms possible. High pressure will build from the northwest Friday, then overhead toward Saturday morning, and to the east Saturday afternoon and night. The high will continue to the east Sunday, then to the southeast for Monday. A frontal boundary will approach the area from the northwest Monday, which will affect the area weather through at least the middle of next week.
The approximate location of the west wall of the Gulf Stream as of May 04, 2021 at 1200 UTC...
- 64 nautical miles east of Flagler Beach.
- 70 nautical miles east of Saint Augustine Beach.
- 77 nautical miles east of Jacksonville Beach.
- 89 nautical miles east southeast of St Simons Island.
| Area Forecast Discussion|
National Weather Service Jacksonville FL
740pm EDT Wednesday May 5 2021
/through Thursday night/... Cold front will be located to the north of the forecast area through this evening, as an upper wave moves northeast across SE GA. Expect isolated showers and storms this afternoon, with a better chance this evening as the wave moves through.
The front will dip into SE GA around midnight, then to near the GA/FL line around dawn. Convective chances will continue through the night due to frontal convergence.
The boundary will slowly move southeast across NE FL through the day Thursday. Precipitation chances should end by midnight Thursday evening, as high pressure builds in from the west northwest.
Best potential for stronger and possibly severe storms through Tonight will be across SE GA, with this potential more over NE FL during the day Thursday.
Temperatures will be above normal Tonight, but trend a little below normal Thursday due to expected precipitation and cloud cover. Temperatures will trend a little below normal northwest Thursday night, while remaining near to a little above normal southeast.
.Long Term.../Friday through Wednesday/... Surface high pressure will continue to build from the west northwest through the day Friday, yielding a dry northwest flow. It is expected to be a sunny day with highs a little below normal.
The high will build overhead Friday night into Saturday morning, then to the east Saturday afternoon. Subsidence under the ridge will continue the dry weather with below normal temperatures.
The high will move more toward the east southeast Sunday. This pattern will yield flow more from the south. This will bring warmer and more humid air back into the region, with highs trending above normal. At this point Sunday still looks like a dry day with precipitation chances too low to mention, but an isolated shower or storm can not be ruled out due to sea breeze convergence and diurnal heating.
A cold front will sink into the southeastern US Monday, with a chance for showers and storms ahead of it. This boundary is expected to settle near the FL/GA line Tuesday, and remain nearly stationary through Wednesday. Waves of energy will move along this boundary, leading to an unsettled period. The potential for strong to severe storms will exist in this Monday to Wednesday timeframe.
A cold front will slowly move southeast across the area through Thursday. High pressure will build from the northwest Friday, then overhead toward Saturday morning, and to the east Saturday afternoon and night. The high will continue to the east Sunday, then to the southeast for Monday. A frontal boundary will approach the area from the northwest Monday, which will affect the area weather through at least the middle of next week.
SE GA Low through Thursday NE FL Low through Thursday
NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...None.