Area Forecast Discussion
Issued by NWS Jacksonville, FL
Issued by NWS Jacksonville, FL
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843 FXUS62 KJAX 240038 AFDJAX Area Forecast Discussion National Weather Service Jacksonville FL 838 PM EDT Sun Jun 23 2024 ...HEAT INDEX VALUES APPROACH ADVISORY LEVELS AGAIN MONDAY AND TUESDAY... .UPDATE... Issued at 830 PM EDT Sun Jun 23 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 Isolated convection at about 8 pm continues to diminish this evening and will end all the precip in the forecast by about 10 pm, as lingering instability continues around the SuwanNee Valley area and where outflows converged. Localized rainfall amounts recently around Live Oak were near 4 inches. Not much in terms of thunderstorm wind gusts recorded at stations this afternoon and evening with highest values around 35-40 mph. Rest of tonight, the low level flow is primarily be southwest to south and will slowly veer around by sunrise. Partly cloudy skies will decrease in coverage, though there may be a small area of low stratus over the Suwannee Valley area late tonight and early Monday morning. Could see a few showers or a storm develop late tonight toward Marion county. Warm overnight lows expected in the lower to mid 70s given the moist low levels and winds of about 5-10 mph. Some stronger southerly winds anticipated at least for first part of tonight along the coast at 10-15 mph at times. Little change for Monday`s forecast with scattered showers and storms in the aftn. Best chances expected over northeast FL. Highs in the mid to upper 90s are indicated. Heat indices will be near advisory levels Monday across northeast FL. Climate-wise, we tied the record high at JAX today, and we may see record warm minimum temps next 24 hours. On Monday, record high possible at Craig Airport, with current record at 98 deg from 2019. For the marine forecast, little overall change rest of tonight with small craft exercise caution headline in effect. Only slight wind and sea changes anticipated for this update. && .NEAR TERM... Issued at 311 PM EDT Sun Jun 23 2024 Troughing stretching across the eastern US will maintain west- northwest flow across the area today. Outflow boundary from morning convection across north-central FL continues to lift northward and collide with the inland moving sea breezes this afternoon developing scattered convection. Mid-level dry air has filtered in from the northwest lowering dewpoints into the low-mid 60s across inland SE GA and Suwannee Valley. Storms may be strong as they develop along boundary collisions in NE FL with the mid- level dry air increasing DCAPE values. Sea breezes will likely collide near the U.S. Highway 17 corridor late this afternoon, with activity likely migrating towards the I-95 corridor towards sunset. Convection subsides by midnight. Early morning showers developing in the Nature Coast may move into Marion and Gilchrist counties in the pre-dawn hours. Overnight lows be in the 70s. && .SHORT TERM... (Monday through Tuesday night) Issued at 311 PM EDT Sun Jun 23 2024 A weakening frontal boundary approaches the area on Monday, with a south to southwesterly flow persisting out ahead of if it as the Bermuda high will be centered almost due east of the First Coast. The flow should be strong enough to keep the sea breeze pinned in the vicinity of I-95 and towards the coastline. The focus for sea breeze convection will be generally along this area, although the presence of the diffuse boundary as well as perhaps some outflow from earlier convection from the northwest could also play factor, and therefore possibly a source of "secondary" chances over more inland southeast GA. The aforementioned boundary essentially stalls and weakens/becomes diffuse just north of southeast GA counties Monday Night and into Tuesday. Guidance is suggesting some lingering drier air bleeding into areas generally from about Waycross northward tomorrow, with PWATs in the 1.2 to 1.5 inch range (below climo). Therefore, convective chances look to be lower in these areas and mainly focused approaching I-10 and southward. The southwesterly flow regime will result in temperatures above average for both Monday and Tuesday: in the mid to upper 90s, almost all the way to the immediate coastline. The majority of the area is expected to remain just below heat advisory criteria, though some spots could see heat indices flirting with that threshold at times, especially around the St. Johns River to the coast and Suwannee Valley. && .LONG TERM... (Wednesday through Saturday) Issued at 311 PM EDT Sun Jun 23 2024 The pattern remains pretty stagnant into Wednesday with south to southwest flow and diurnal convection along the sea breeze collision area inland. Another frontal boundary approaches Thursday and similarly stalls out and becomes diffuse to our north, though will bring increased layer moisture ahead of it which should essentially last into Friday and the start of the weekend. High pressure behind the front will start to build more to our northeast by Friday and into the weekend, which should return more of a weaker flow out of the east to southeast and therefore a pretty typical summer sea breeze type of pattern. Temps start above average for this period, but gradually trend more towards normal as the synoptic flow becomes more broad and weaker compared to earlier in the week. && .AVIATION... (00Z TAFS) Issued at 830 PM EDT Sun Jun 23 2024 VFR clouds expected to prevail overnight, though some low stratus could form and move toward GNV and VQQ between 06z-13z Monday. Confidence remains on the low side on this potential. Sct cumulus expected to form about about 13z-16z Monday. A near repeat of scattered showers and storms on Monday aftn and evening, mainly during the aftn. Have introduced VCTS by about 18-20z, with no more than a PROB30 group shown after 19z. Sfc winds tonight will be southerly near 5-10 kt and diminish slightly toward early morning. West to southwest winds expected Monday morning, then back more southwest and south. The south winds will mainly be for the coastal TAFs as a weak Atlantic sea breeze develops. && .MARINE... Issued at 311 PM EDT Sun Jun 23 2024 South-southeasterly winds develop this afternoon over the near shore waters as the Atlantic sea breeze moves inland. Winds will shift to south- southwesterly and will surge to Caution levels throughout our local waters this evening outside of ongoing thunderstorm activity. West-southwesterly winds will prevail for the rest of the week as another trough settles over the southeastern states, with scattered thunderstorm chances prevailing each afternoon and evening as activity moves eastward across our local waters. Rip Currents: Developing onshore winds this afternoon will combine with an easterly ocean swell to create a moderate rip current risk at all area beaches. The easterly swell will begin to fade on Monday, dropping the risk to low for the southeast GA beaches, while onshore winds during the afternoon keep a lower end moderate risk at the northeast FL beaches. && .PRELIMINARY POINT TEMPS/POPS... AMG 75 96 75 98 / 10 30 20 40 SSI 78 95 79 93 / 20 30 30 30 JAX 75 97 75 96 / 20 40 30 50 SGJ 76 96 77 94 / 20 50 30 50 GNV 74 95 74 95 / 30 60 20 70 OCF 74 94 75 94 / 40 70 20 70 && .JAX WATCHES/WARNINGS/ADVISORIES... FL...None. GA...None. AM...None. && $$