Marine Weather Net

Altamaha Sound, GA to Fernandina Beach, FL 20 - 60 NM Marine Forecast


TONIGHT

NE
WINDS
20 - 25
KNOTS

TUESDAY

NE
WINDS
15 - 20
KNOTS

TUESDAY NIGHT

NE
WINDS
10 - 15
KNOTS

WEDNESDAY

E
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ470 Forecast Issued: 316 PM EDT Mon Sep 21 2020

GALE WARNING IN EFFECT UNTIL 2 AM EDT TUESDAY ...SMALL CRAFT ADVISORY IN EFFECT FROM 2 AM EDT TUESDAY THROUGH WEDNESDAY MORNING...
Tonight...Northeast Winds 20 To 25 Knots. Seas 11 To 15 Feet With A Dominant Period 15 Seconds. Slight Chance Of Showers.
Tuesday...Northeast Winds 15 To 20 Knots. Seas 9 To 12 Feet With A Dominant Period 13 Seconds. Slight Chance Of Showers In The Afternoon.
Tuesday Night...Northeast Winds 10 To 15 Knots Diminishing To 5 To 10 Knots After Midnight. Seas 8 To 11 Feet With A Dominant Period 13 Seconds.
Wednesday...East Winds 5 To 10 Knots. Seas 8 To 11 Feet.
Wednesday Night...Southeast Winds 5 To 10 Knots. Seas 7 To 10 Feet.
Thursday...Southeast Winds 10 To 15 Knots. Seas 5 To 7 Feet.
Thursday Night...Southeast Winds 10 To 15 Knots. Seas 4 To 6 Feet. Slight Chance Of Showers And Thunderstorms.
Friday...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet. Chance Of Showers And Slight Chance Of Thunderstorms.
Friday Night...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet. Chance Of Showers And Thunderstorms.
Saturday...Southeast Winds 10 Knots. Seas 3 To 5 Feet. Chance Of Showers And Thunderstorms.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
316 PM EDT Mon Sep 21 2020

The strong low level ridge of high pressure to our north will gradually sink south and weaken over the next few days. Northeast winds at 20 to 25 knots with frequent gusts to gale force this evening will subside to 15 to 20 knots by early Tuesday morning. Waves will take longer to lower, with seas of 7 feet or higher possibly lasting past Wednesday morning, particularly over our offshore waters. Mostly dry conditions should continue through Thursday. As we head into the weekend, our next front will approach the area, bringing an increase in chances for showers and thunderstorms.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Sep 19, 2020 at 1200 UTC...
- 52 nautical miles east of Flagler Beach.
- 64 nautical miles east southeast of Saint Augustine Beach.
- 82 nautical miles east of Jacksonville Beach.
- 85 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
732pm EDT Monday September 21 2020

Near Term - Through Tonight
Strong, deep layer ridge of high pressure in place over the region with the low level portion of the ridge centered over the Appalachian mountains. This has led to breezy northeasterly winds today gusting to near 40 mph, mostly along our coastline. This has also led to a host of other coastal hazards including a high risk of rip currents, high surf, and coastal flooding. The strongest winds and worst coastal flooding should subside this evening, but won't go completely go calm overnight.

Onshore flow has also allowed the development of isolated to scattered showers, again mostly along the coastline. Rounds of light to moderate showers will continue into tonight, but should dissipate across the area by midnight.

Short Term - Tuesday Through Wednesday Night
Low level ridge of high pressure will slide south through mid-week and weaken, allowing low level winds to become lighter and more easterly. With continued onshore flow and seasonally high tides, minor coastal flooding, high rip current risk, and elevated surf heigheights will continue through Wednesday morning. A cool, dry air mass in place with highs in the upper 70s to low 80s and lows in the upper 50s to upper 60s. Isolated showers possible on Tuesday, but airmass will likely be too dry for shower development Wednesday.

Long Term - Thursday Through Monday
Ridge of high pressure will begin to shift eastward offshore at the end of the work week, with southeasterly flow returning moisture to the area ahead of a developing cold front starting Thursday. Isolated to scattered storms will return around Thursday-Friday as a result of this return flow of moisture. Front may not reach our area until early next week, but scattered storms appear likely through the weekend out ahead of it. Temperatures will trend above normal, with highs mostly in the 80s and lows in the upper 60s to low 70s.

Marine
The strong low level ridge of high pressure to our north will gradually sink south and weaken over the next few days. Northeast winds at 20 to 25 knots with frequent gusts to gale force this evening will subside to 15 to 20 knots by early Tuesday morning. Waves will take longer to lower, with seas of 7 feet or higher possibly lasting past Wednesday morning, particularly over our offshore waters. Mostly dry conditions should continue through Thursday. As we head into the weekend, our next front will approach the area, bringing an increase in chances for showers and thunderstorms.

Rip Currents
High risk of rip currents in effect for NE FL and SE GA beaches through Wednesday morning. High surf advisory in effect along NE FL beaches through Wednesday morning, along SE GA beaches through Tuesday morning.

Coastal Flood
Worst of the coastal flooding should subside with this afternoon's high tide cycle, but water levels along the Atlantic coastline and the St. John's River for the next several days. Coastal flood warning remains in effect through 6pm ET and then a coastal flood advisory will take its place.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...High Rip Current Risk through Wednesday morning for Coastal Duval-Coastal Flagler-Coastal Nassau-Coastal St. Johns.

Coastal Flood Advisory until 5pm EDT Tuesday for Clay-Coastal Duval-Coastal Flagler-Coastal Nassau-Coastal St. Johns- Inland Duval-Inland Flagler-Inland St. Johns-Putnam.

High Surf Advisory until 8am EDT Wednesday for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

Wind Advisory until 8pm EDT this evening for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

GA...High Rip Current Risk through Wednesday morning for Coastal Camden-Coastal Glynn.

High Surf Advisory until 8am EDT Tuesday for Coastal Camden- Coastal Glynn.

Coastal Flood Advisory until 5pm EDT Tuesday for Coastal Camden- Coastal Glynn.

AM...Small Craft Advisory from 2am Tuesday to 8am EDT Wednesday for Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM-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 Altamaha Sound GA to Fernandina Beach FL from 20 to 60 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.

Gale Warning until 2am EDT Tuesday for Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM-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 Altamaha Sound GA to Fernandina Beach FL from 20 to 60 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.