Marine Weather Net

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


TODAY

N
WINDS
20 - 25
KNOTS

TONIGHT

N
WINDS
20 - 25
KNOTS

TUESDAY

N
WINDS
25 - 30
KNOTS

TUESDAY NIGHT

N
WINDS
25 - 30
KNOTS

The Marine Weather Forecast In Detail:
AMZ470 Forecast Issued: 327 AM EST Mon Jan 20 2020

SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON
Today...North Winds 20 To 25 Knots With Gusts To Around 35 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 9 Feet Building To 6 To 9 Feet With Occasional Seas Up To 11 Feet In The Afternoon. Dominant Period 6 Seconds. A Chance Of Showers.
Tonight...North Winds 20 To 25 Knots With Gusts To Around 35 Knots. Seas 6 To 9 Feet With Occasional Seas Up To 11 Feet. Dominant Period 7 Seconds.
Tuesday...North Winds 25 To 30 Knots With Gusts To Around 40 Knots. Seas 5 To 7 Feet With Occasional Seas Up To 9 Feet Building To 7 To 10 Feet With Occasional Seas Up To 13 Feet In The Afternoon. Dominant Period 6 Seconds. A Chance Of Showers.
Tuesday Night...North Winds 25 To 30 Knots With Gusts To Around 40 Knots. Seas 10 To 13 Feet With Occasional Seas Up To 17 Feet. Dominant Period 8 Seconds. A Chance Of Showers.
Wednesday...North Northeast Winds 25 To 30 Knots With Gusts To Around 40 Knots. Seas 10 To 15 Feet With Occasional Seas Up To 19 Feet. Dominant Period 9 Seconds. A Chance Of Showers.
Wednesday Night...Northeast Winds 20 To 25 Knots. Seas 9 To 12 Feet With Occasional Seas Up To 15 Feet. Showers Likely.
Thursday...East Northeast Winds 15 To 20 Knots. Seas 7 To 10 Feet With Occasional Seas Up To 13 Feet. Showers Likely.
Thursday Night...East Winds 15 To 20 Knots. Seas 6 To 8 Feet With Occasional Seas Up To 10 Feet. A Chance Of Showers.
Friday...South Southeast Winds 10 To 15 Knots. Seas 6 To 8 Feet With Occasional Seas Up To 10 Feet. A Chance Of Showers.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
327 AM EST Mon Jan 20 2020

Small Craft Advisory for the nearshore and offshore waters will continue through Tuesday afternoon. Strong high pressure to the northwest of the area waters will move east on Monday and will help to bring in elevated northerly winds around 20 to 25 knots with elevated seas 5 to 7 feet. On Tuesday the high will build closer towards the region and elevated winds from the north will continue. On Wednesday high pressure will be north of the area waters near the Mid Atlantic coast while a low pressure system starts to form over the Bahamas and winds will surge from the northeast as the pressure gradient tightens between the high pressure to the north and the surface low to the southeast of the area waters. A chance of showers is expected Tuesday and into Wednesday.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Jan 20, 2020 at 1200 UTC...
- 63 nautical miles east of Flagler Beach.
- 68 nautical miles east of Saint Augustine Beach.
- 76 nautical miles east of Jacksonville Beach.
- 89 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
1250am EST Monday Jan 20 2020

.NEAR TERM [Through Monday]... A cold front is currently over north Florida moving to the southeast. Showers come to an end from northwest to southeast tonight as the cold front exits the region. Strong high pressure located over the upper Plains begins to build into the region from the northwest filtering in colder, drier air. Temperatures drop tonight with portions of inland southeast Georgia and Suwannee Valley briefly reaching freezing temperatures near sunrise. Lows tonight will range from the low 30s to the low 40s. Mostly sunny skies prevail tomorrow though highs will only reach the upper 40s to upper 50s. Northerly winds tomorrow will be breezy along the coast.

.SHORT TERM [Monday Night Through Wednesday]... Cold, strong high pressure moves from the Mississippi River Valley into the Mid-Atlantic through Wednesday funneling cold, dry air into the region. Temperatures remain well below average until mid- week. A Freeze Watch is in effect for Monday night into Tuesday morning as a light freeze is likely across southeast Georgia and portions of inland northeast Florida. Lows Tuesday will range from the upper 20s to upper 30s. Continued cold air advection will lead to a widespread light freeze Wednesday morning except along the immediate coast. A hard freeze will be possible Wednesday morning as well with portions of inland southeast Georgia and Suwannee Valley reaching 27 degrees or lower. With relatively stronger winds overnight, wind chills could drop to the upper teens and 20s. High temperatures begin to rebound on Wednesday as they reach into the 50s.

Tuesday into Wednesday, strong northeasterly flow develops over our coastal waters as high pressure builds over the mid-Atlantic and low pressure develops over the Bahamas. With onshore flow, a few coastal showers will be possible on Wednesday. Gusty winds also prevail along the coast.

.LONG TERM [Thursday Through Saturday]... On Thursday, onshore flow and coastal showers continue with weak coastal troughing as high pressure moves further to our northeast. Rain chances increase ahead of the next cold front Friday into Saturday. There is some uncertainty in timing with the next frontal passage. Temperatures continue to warm ahead of the next cold front with highs reaching into the 70s on Friday.

Marine
Small Craft Advisory will continue for the offshore waters into Monday night as 7 foot seas and winds linger. Small Craft Advisory will be in effect tonight for the nearshore waters as the winds increase behind the frontal passage. High pressure builds in from the northwest into Tuesday. Tuesday into Wednesday, the high pressure builds in over the mid-Atlantic as a low pressure system develops over the Bahamas. This will cause a surge of strong northeasterly winds and high waves to move into our coastal waters. Showers will be possible on Tuesday and Wednesday.

Rip Currents
Moderate Risk of rip currents today for NE FL beaches with a low risk of rip currents for SE GA beaches.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...Freeze Watch from this evening through Tuesday morning for Baker- Bradford-Clay-Eastern Alachua-Gilchrist-Hamilton-Inland Duval-Inland Nassau-Northern Columbia-Southern Columbia- Suwannee-Union-Western Alachua.

GA...Freeze Watch from this evening through Tuesday morning for Appling-Atkinson-Bacon-Brantley-Clinch-Coastal Camden- Coastal Glynn-Coffee-Echols-Inland Camden-Inland Glynn-Jeff Davis-Northeastern Charlton-Northern Ware-Pierce-Southern Ware-Wayne-Western Charlton.

AM...Small Craft Advisory until 2am EST Tuesday for 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.

Small Craft Advisory until 7am EST this morning 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.