Area Forecast Discussion
Issued by NWS Jacksonville, FL
Issued by NWS Jacksonville, FL
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759 FXUS62 KJAX 010121 AFDJAX Area Forecast Discussion National Weather Service Jacksonville FL 921 PM EDT Sun Jun 30 2024 ...New UPDATE... .UPDATE... Issued at 916 PM EDT Sun Jun 30 2024 For the latest NE FL and SE GA Daily Key Messages please visit: https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf Daytime convection is still holding on over inland areas, but should begin to wean rather quickly in the next hour or two. Some outflow from convection that occurred today north of inland southeast GA counties may spawn a few showers and perhaps a thunderstorm as it enters this area around the 10 PM to midnight time frame. However, not expecting this activity to hold together very long with the lack of low level instability. Otherwise, some lingering debris clouds will mostly dissipate during the overnight hours with seasonably mild low temps. && .NEAR TERM... Issued at 249 PM EDT Sun Jun 30 2024 For the latest NE FL and SE GA Daily Key Messages please visit: https://www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf Showers are slowly developing from the west along the I-10 corridor and over SE GA. With a moist atmosphere in place, current PWAT values hovering around 2", scattered showers and storms are expected to continue to develop this afternoon into early evening, mainly for locations across SE GA and eastward towards US-301 in NE FL. Potential hazards for any storms that do develop include downburst winds of 40-50mph, frequent lightning, as well as heavy downpours that may result in localized flooding, particularly at urban and normally flood prone locations. The Heat Advisory will remain in place through late afternoon for portions of SE GA, as Heat Index values currently are reading from 103F to 108F and will look to continue to rise before showers and storms begin to develop during the mid afternoon. By the evening, temperatures will begin to lower into the low to mid 70s across the inland areas, with coastal areas residing from the mid to upper 70s. && .SHORT TERM... (Monday through Tuesday night) Issued at 249 PM EDT Sun Jun 30 2024 A cold front over central GA gradually sags southward on Monday before stalling and diffusing over SE GA on Tuesday. Scattered to numerous showers and storms develop each day along the sea breezes and the frontal boundary. This boundary and mesoscale collisions will provide the focus for stronger convection with the potential for isolated strong/severe storms being possible Monday afternoon/evening mainly over SE GA. Deep tropical moisture (PWATs 2.2 - 2.7 in.) ahead of the front will result in storms capable of producing heavy rainfall with a potential for flooding especially in SE GA. Localized areas could see rain amounts in the 2-4 in. range especially where storms train. High temperatures for the beginning of the week will be in the 90s for most inland areas and in the upper 80s along the coast and for areas behind the frontal boundary. Overnight low temperatures will drop down into the mid 70s over inland areas and in the upper 70s along the coastline. && .LONG TERM... (Wednesday through next Sunday) Issued at 249 PM EDT Sun Jun 30 2024 High pressure aloft and drier air shift over the region in the wake of the weakening front lowering storm coverage and allowing a warming trend through the weekend. Lingering tropical moisture on Wednesday will result in numerous showers and storms developing along the sea breezes. Convection becomes more scattered Thursday into the weekend with drier north-northeasterly flow. The greatest chances for storms will be over north-central FL where PWATs remain 2+ inches. Highs in the low-mid 90s mid-week quickly rise into the mid-upper 90s by Friday. Potential for heat advisory conditions will continue and become more likely by the end of the period. && .AVIATION... (00Z TAFS) Issued at 739 PM EDT Sun Jun 30 2024 Diurnal convection is ongoing away from the coast, mainly affecting VQQ and GNV as of 00Z. It is possible for some SHRA to briefly affect JAX through about 01-02Z, though any activity is expected to quickly start winding down soon. MVFR cannot be ruled out briefly if any RA does occur. Otherwise, VFR is expected overnight for all terminals with the exception of VQQ, which is expected to reach MVFR at times towards the morning hours. Typical summer daytime convection is expected once again Monday afternoon and evening, with more specific timing TBD. Winds of 10+ knots will be expected prior to diurnal convection at most sites by Monday afternoon. && .MARINE... Issued at 249 PM EDT Sun Jun 30 2024 Atlantic high pressure will sink southward tonight as a frontal boundary approaches our local waters from the north. Offshore winds will prevail ahead of this approaching frontal boundary, except near shore, where the Atlantic sea breeze will push inland this afternoon. Widely scattered showers and thunderstorms will be possible into the evening hours today, mainly over the near shore waters. The frontal boundary will stall over the Georgia waters on Tuesday, with increasing chances for mainly afternoon and nighttime showers and thunderstorms across our local waters. Prevailing winds will shift to east and southeasterly beginning on Tuesday as high pressure builds down the southeastern seaboard. High pressure will then weaken as it shifts southward towards our local waters later this week. Rip Currents: A low end moderate rip current risk at area beaches through Monday, as onshore flow and a dominant easterly swell of continues. && .HYDROLOGY... Issued at 249 PM EDT Sun Jun 30 2024 Deep tropical moisture over the region will lead to heavy downpours from convection especially along and ahead of an approaching frontal boundary from the north. WPC has placed portions of SE GA in a slight risk of excessive rainfall for Monday. Localized areas could see rain amounts in the 2-4 in. range especially where storms train. Depending on rainfall amounts today, a Flood Watch may be needed for portions of SE GA for Monday. && .PRELIMINARY POINT TEMPS/POPS... AMG 74 93 74 88 / 50 80 60 60 SSI 78 90 78 88 / 30 70 70 70 JAX 75 94 75 92 / 50 50 50 70 SGJ 76 93 77 92 / 30 40 40 60 GNV 73 92 74 92 / 70 50 30 70 OCF 74 92 75 93 / 60 50 30 70 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. && $$