Marine Weather Net

St. Augustine to Flagler Beach, FL 20 - 60 NM Marine Forecast


10 - 15


15 - 20


15 - 20


15 - 20

The Marine Weather Forecast In Detail:
AMZ474 Forecast Issued: 707 PM EST Sun Jan 24 2021

Tonight...Southeast Winds 10 To 15 Knots. Seas 3 To 5 Feet With A Dominant Period 5 Seconds. Chance Of Showers.
Monday...South Winds 15 To 20 Knots. Seas 4 To 6 Feet With A Dominant Period 6 Seconds. Slight Chance Of Showers In The Morning.
Monday Night...Southwest Winds 15 To 20 Knots. Seas 4 To 6 Feet With A Dominant Period 6 Seconds. Areas Of Fog After Midnight.
Tuesday...Southwest Winds 15 To 20 Knots. Seas 3 To 5 Feet.
Tuesday Night...Southwest Winds 10 To 15 Knots. Seas 3 To 4 Feet. Slight Chance Of Showers After Midnight.
Wednesday...Southwest Winds 10 To 15 Knots. Seas 2 To 3 Feet. Slight Chance Of Showers. Slight Chance Of Thunderstorms In The Afternoon.
Wednesday Night...Southwest Winds 15 To 20 Knots Becoming West 25 To 30 Knots After Midnight. Seas 5 To 7 Feet. Chance Of Showers And Slight Chance Of Thunderstorms.
Thursday...Northwest Winds 25 To 30 Knots. Seas 7 To 10 Feet.
Thursday Night...North Winds 20 To 25 Knots. Seas 7 To 10 Feet.
Friday...North Winds 15 To 20 Knots Diminishing To 10 To 15 Knots In The Afternoon. Seas 6 To 8 Feet.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
707 PM EST Sun Jan 24 2021

A frontal boundary positioned across south Florida will lift northward as a warm front tonight. Southerly winds will then strengthen on Monday afternoon as the warm front lifts north of the Georgia waters. Low pressure will develop along a stalled frontal boundary near the Florida panhandle on Wednesday. This low pressure center will move northeastward across the Georgia waters on Wednesday night, dragging a strong cold front across our area by early Thursday. Low pressure will then rapidly strengthen off the Carolina coast on Thursday, with strong northwesterly winds overspreading our local waters. Cool high pressure center will build in from the West on Friday.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Jan 23, 2021 at 1200 UTC...
- 54 nautical miles east northeast of Flagler Beach.
- 61 nautical miles east of Saint Augustine Beach.
- 74 nautical miles east of Jacksonville Beach.
- 91 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
733pm EST Sunday Jan 24 2021

Fog and low level clouds are still expected to build in overnight throughout the region and then clear out from the forecast area by late morning. Overnight low temperatures are expected to range between the mid 50s and the lower 60s.

.NEAR TERM [Tonight Through Monday Night]... Warm front will slowly lift northward through the region late tonight with a return to above normal temps on Monday. Rainfall chances tonight with the frontal boundary still appear on the low side for now with just a slight chance of a shower and the bigger story will be some patchy fog development towards morning as light Southeast flow develops and moisture levels increase. For now appears to be just enough wind in the boundary layer to keep atmosphere mixed to keep fog patchy in nature over inland areas but some patchy sea fog may attempt to form over the coastal waters where some water temps are still as low as the upper 50s. Otherwise generally mostly cloudy skies will continue with lows only falling into the middle/upper 50s for most locations. On Monday as warm front lifts north of the region by the afternoon expect South-Southwest winds to develop at 15 mph with gusts to 25-30 mph at times in the afternoon with above normal highs in the upper 70s SE GA and near 80/lower 80s for NE FL. Another mild night expected Monday Night with light Southwest flow ahead of approaching frontal boundary from the West and abundant low level moisture will continue the threat for areas of fog,possibly dense at times depending on how strong the low level flow is.

Short Term - Tuesday Through Wednesday Night
Short range model diffs between GFS/ECMWF (European Centre for Medium-Range Weather Forecasts) with stalled frontal boundary across GA and possible energy/lift along this feature on Tuesday makes details tough to point out at this time but overall expect continued above normal temps around 80 degrees and possible shower/isolated storm activity across SE GA while NE FL remains dry and warm with another round of patchy fog possible on Tuesday Night with mild overnight lows around 60 degrees. Models in better agreement with low pressure development along the frontal boundary over Central GA on Wednesday that will track Northeast and drag strong cold front through all areas late Wednesday through Wednesday Night with scattered to numerous showers and embedded storms, some of which may be strong with gusty winds expected at this time. Highs well into the 70s/near 80 on Wednesday will crash into the 40s/lower 50s by early Thursday morning following the frontal passage.

.LONG TERM [Thursday Through Sunday]... Windy and much colder conditions expected in the wake of cold frontal passage on Thursday with Northwest winds at 15-25 mph with gusts of 30-40 mph and Highs returning to slightly below normal levels and will set the stage for lows in the 30s Thu Night across SE GA and inland NE FL with some patchy frost possible but a widespread freeze is not expected at this time. High pressure builds over the region Fri/Sat with seasonably cool temps continuing and another night with patchy inland frost possible on Fri Night. On Sunday long range models in decent agreement with next frontal boundary approaching and a return to above normal temps with highs in the lower/middle 70s and possible rainfall late in the day for SE GA.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...None.