Area Forecast Discussion
Issued by NWS Melbourne, FL
Issued by NWS Melbourne, FL
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909 FXUS62 KMLB 140052 AFDMLB Area Forecast Discussion National Weather Service Melbourne FL 852 PM EDT Thu Jun 13 2024 ...New UPDATE... .UPDATE... Issued at 852 PM EDT Thu Jun 13 2024 Evening convection has transitioned west of east central Florida this evening with the rain across the south also ending by early evening. A surface pressure trough bisecting Osceola and Brevard Counties and extending northeast into the Atlantic will be the dividing line between deeper moisture that will continue across the southern peninsula and somewhat drier air to the north. Short range models do not show much redevelopment of convection overnight, but will continue small chances for a shower or storm across mainly Okeechobee county and the southern Treasure Coast later tonight. Anvil cloudiness extends across northern sections and should tend to decrease by midnight. With some partial clearing north and some low level northeast flow behind the surface trough the short range guidance is more bullish on development of low stratus across the northern interior overnight, but these areas should remain dry. Lows will be in the lower to mid 70s for much of the area with some upper 70s along the warmer spots on the barrier islands. && .PREVIOUS DISCUSSION... Issued at 335 PM EDT Thu Jun 13 2024 Currently-Tonight...Area of low pressure, designated Invest 90L, off the northeast FL coast will continue to shift slowly northeast into tonight. Trough extending from this low has shifted southward toward the Orlando area, with winds out of the N/NE near and north of this area. While farther south, S/SW flow continues to pull in more moisture, which led to higher coverage of showers and storms across Okeechobee County and the Treasure Coast. This activity has continued to weaken as it shifts eastward and offshore. Farther north, convection will continue to increase through late afternoon where greater daytime heating is ongoing. Scattered to numerous showers and storms will primarily develop along any boundaries, including the lingering trough axis, the inland moving sea breeze across Volusia County, and from any differential heating boundaries generated by the increased cloud cover across southern portions of the area, and partly sunny skies to the north. Persistent or repeated rounds of showers and storms will still pose a threat of heavy rainfall, with totals around 1-3" and locally higher totals of 4 inches or more possible. Additional storm threats will include occasional to frequent lightning strikes and strong gusty winds to 40 to 45 mph. Scattered showers and storms will linger into the evening, but gradually diminish by late evening and toward midnight. CAM guidance indicates fairly dry conditions overnight. However, some increasing shower/storm potential will occur later tonight toward daybreak Friday across Okeechobee County and the Treasure Coast. Remaining mild and humid with lows in the low to mid 70s. Friday-Saturday...Invest 90L will continue to lift N/NE and remain offshore the eastern U.S. coast, and may strengthen some through early this weekend. As it does so, a weak frontal boundary will shift into northern portions of central FL, and gradually fade into the weekend. There remains some differences in the models with how much drier air filters into the north through this period, with the GFS drier than the ECMWF. Have trended PoPs down to 60-70 percent into tomorrow, and ranging from 40-50 percent north of Orlando and 60-70 percent south on Saturday. Steering winds weaken and deeper moisture across southern portions of central FL will keep the potential for locally heavy rainfall in the forecast. WPC maintains a Marginal Risk for Excessive Rainfall in the forecast for both days, especially focused over southern sections of the area. Locally heavy rainfall of 1-3 inches will be possible with any slow moving or repeated rounds of showers and storms. Other storm hazards will continue to be occasional to frequent lightning strikes and gusty winds. Afternoon high temperatures forecast to be a little warmer across northern portions of east central FL both days, with highs in the low to mid 90s and in the upper 80s to the south. Lingering humid conditions will lead to peak heat index values around 100-105. Overnight lows remain in the low to mid 70s. Sunday-Wednesday...High pressure building off the eastern U.S. coast will lead to winds becoming onshore and increasing into next week. This will shift deeper moisture southwest of the area. However, models continue to be in disagreement through early week, with the ECM showing higher rain chances than the GFS due to the GFS showing drier air moving into the area. Therefore some uncertainty remains in overall rain chances, but have PoPs trending downward from 50-60 percent on Monday and then around 50 percent Tuesday through Wednesday. Temperatures will be seasonable through the period, with afternoon highs in the upper 80s to low 90s, and lows remaining in the 70s. && .AVIATION... (00Z TAFs) Issued at 800 PM EDT Thu Jun 13 2024 IMPACTS: -Areas of stratus later tonight may develop overnight for northern terminals. -Thunderstorm chances continue for most ECFL terminals Friday afternoon, drier for the KDAB vcnty on Fri. Scattered SHRA/TSRA have pushed southwestward this evening well west of the KLEE and KISM terminals and light rain across the KFPR-KSUA has also been on the wane the last few hours. 18Z guidance has trended more bullish on stratus prospects across the northern terminals later tonight and added some late night TEMPO groups mainly after 08z for some areas of stratus developing. For Friday...some drier air across Volusia and progression of the east coast breeze should see lower SHRA/TSRA chances in the KDAB- KTIX corridor. Scattered SHRA/TSRA for interior areas should develop form 18z-20z in the KSFB-KMCO corridor and move farther inland through late afternoon twd the KLEE-KISM corridor. && .MARINE... Issued at 335 PM EDT Thu Jun 13 2024 Update...Little change in the forecast for the overnight with the low pressure trough remaining across the waters. Buoy 41069 off the Volusia County coast has winds from the NNE to 10 knots with winds across the Treasure Coast waters from the SW to 15 knots. Some nocturnal redevelopment of showers and storms is expected across the Atlantic with higher coverage for the Treasure Coast waters. Seas 2 ft near shore to 3 ft offshore. Tonight...Invest 90L off the northeast FL coast will shift slowly northeast, with a weak trough axis across the northern waters. This will lead to varying winds out of the N/NW across the Volusia waters, around 5-10 knots, and out of the W/SW farther south up to 10-15 knots. Seas will range from 1-3 feet. Scattered showers and storms will continue to be possible, especially across the Treasure Coast waters into tonight. Friday-Monday...(Modified Previous Discussion) A weak front will shift into and remain in place across north central Florida through Friday and gradually fade into the weekend. Invest 90L is forecast to continue to move northeast off the eastern US coast. Winds will be rather variable around 5-10 knots on Friday, becoming E-SE on Saturday afternoon. Winds will become easterly and increase to 10-15 knots on Sunday as high pressure exits offshore of the eastern U.S. coast, and will remain onshore and increase into early next week with speeds up to 15-20 knots. Seas 2-3ft will increase up to 4 ft in the offshore waters on Monday. Scattered showers and scattered lightning storms will generally persist each day, especially across the Gulf Stream waters. && .PRELIMINARY POINT TEMPS/POPS... DAB 74 90 74 92 / 10 60 20 40 MCO 75 92 75 91 / 20 60 30 60 MLB 73 89 74 89 / 20 60 40 60 VRB 72 89 72 89 / 30 70 50 70 LEE 76 94 76 95 / 20 60 30 50 SFB 74 92 75 94 / 10 60 30 50 ORL 76 92 75 93 / 20 60 30 60 FPR 72 89 72 89 / 30 70 50 70 && .MLB WATCHES/WARNINGS/ADVISORIES... FL...None. AM...None. && $$ UPDATE...Volkmer AVIATION...Volkmer