Area Forecast Discussion
Issued by NWS
Issued by NWS
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243 FXUS62 KTAE 131957 AFDTAE Area Forecast Discussion National Weather Service Tallahassee FL 357 PM EDT Mon May 13 2024 ...New NEAR TERM, SHORT TERM, LONG TERM, AVIATION, MARINE, FIRE WEATHER, HYDROLOGY... .NEAR TERM... (Through Tuesday) Issued at 344 PM EDT Mon May 13 2024 The MCS that has been moving across the region today has push rain- cooled air across out Alabama, Georgia, and Panhandle counties, including the Gulf waters south of the Panhandle coast. The southeast Big Bend and Lower Suwannee Valley still has convectively untainted air, with Cross City observing a sultry T/Td of 84/70 at 3 pm ET. Now that we know the exiting MCS pushed an outflow boundary so far south, it will shade the track of the next MCS --- currently over southeast Texas --- further south as well. It will quickly race east this evening and overnight in the base of the shortwave trough spinning over the Ozarks, tracking east along the northern Gulf Coast. The bulk of the severe thunderstorm and heavy rain threat early Friday morning will be over our Florida counties and over the Gulf waters. The inland extent will depend on how far north the leftover boundary can rebound northward. For the Flood Watch, have trimmed it back from our Alabama counties and most southwest Georgia counties, while expanding it through Madison and Lafayette Counties to the Suwannee. In the watch area, an additional 3 to 5 inches of rain is forecast, with spotty amounts of up to 8 inches possible. && .SHORT TERM... (Tuesday night through Wednesday night) Issued at 344 PM EDT Mon May 13 2024 Today`s front attendant to its Parent Low is slated to gradually make its eastward exit from the region during the short-term period. As this boundary does so, it should continue to provide a focus for showers/thunderstorms oriented in SW-NE fashion from Apalachee Bay into the Suwannee Valley & parts of South-Central GA late Tuesday through early Wednesday. Heavy rain appears to be the biggest concern with this activity at the aforementioned locations where training convection is possible. As such, a Marginal Risk (level 1 of 4) is in place by the WPC in their Day 3 Outlook - valid 12Z Wednesday to 12Z Thursday. Isolated strong to severe storms cannot be ruled out, either. Improving weather is expected from NW to SE on Wednesday, which will pave the way for temporarily quiet conditions by Thursday. Forecast high temperatures are mostly in the 80s (isolated 90 degrees) while lows "cool" from upper 60s/near 70 Wednesday AM to mid/upper 60s Thursday AM. The latter is attributed to pre to post-frontal airmass transition. && .LONG TERM... (Thursday through Sunday) Issued at 344 PM EDT Mon May 13 2024 A weak upper ridge briefly translates east across the region on Thursday, so expect a convective lull until Friday when yet another storm system moves in from the west. The environment looks favorable for scattered showers/thunderstorms, some of which could be strong to severe with the capability of producing heavy rainfall. Unsettled weather persists into next weekend as troughing overspreads the Eastern US. However, an upstream ridge building eastward likely ushers improving conditions near the end of the long-term period. High temperatures in the 80s with lows in the 60s will be common. The warmest readings are expected Thursday afternoon when modeled upper heights peak at around 584-586 dm. Therefore, look for widespread upper 80s to low 90s with heat indices a few degrees warmer during that time. && .AVIATION... (18Z TAFS) Issued at 344 PM EDT Mon May 13 2024 The bulk of today`s convection has now passed the terminals, but a few hours of trailing stratiform rain with embedded thunder will continue until almost sunset. The main challenge will then turn to timing and strength of the next cluster of strong to severe thunderstorms. This should arrive at the terminals during the late night and early morning hours. && .MARINE... Issued at 344 PM EDT Mon May 13 2024 The West Tampa Buoy (42036) reported a south wind around 15 kts with 3-ft seas and a dominant period of 4 sec. Clusters of thunderstorms continue to move through the waters this afternoon. Additionally, coastal observations in the western FL Panhandle have been frequently gusting 25 to 30 kts in response to a wake low from earlier maritime convection. From CWF Synopsis...Multiple rounds of thunderstorm clusters will traverse the waters through Tuesday, bringing strong to severe wind gusts, possible waterspouts, and frequent lightning. Advisory to near advisory conditions are still expected early Tuesday into at least Wednesday morning. Frontal passage occurs Wednesday afternoon with improving weather from west to east. Cautionary winds and seas are likely until Wednesday evening. A lull in maritime convection is on tap for Thursday, followed by renewed chances for thunderstorms heading into the weekend. && .FIRE WEATHER... Issued at 344 PM EDT Mon May 13 2024 A couple of additional rounds of thunderstorms will affect the districts through Tuesday, bringing widespread wetting rains, with some flooding possible under downpours. Some thunderstorms could be severe. Drying westerly flow will kick in on Wednesday, when deep mixing heights and moderate transport winds will support high afternoon dispersion. && .HYDROLOGY... Issued at 344 PM EDT Mon May 13 2024 The Flood Watch (in effect until Tuesday evening) was updated this afternoon to remove SE AL and most of SW GA with an eastward expansion to include our remaining FL counties, minus Dixie. Potential for additional waves of heavy rain capable of flash flooding still exist as a lingering frontal boundary slowly translates eastward. Updated forecast amounts through Wednesday are widespread 2-4 inches, isolated 6-8 inches. Highest values are along/south of the I-10 corridor and are well aligned with the WPC Day 2 Slight Risk (level 2 of 4). Dry weather is expected on Thursday before more rain arrives Friday- Saturday from the next storm system. Another 1 to 2 inches are forecast. The longer-term concerns are riverine flooding, depending on where the heaviest rain ultimately falls. Future rises in the Ochlockonee & Apalachicola basins appear reasonable. && .SPOTTER INFORMATION STATEMENT... Spotter activation is not requested. However, spotters are always encouraged to safely report significant weather conditions when they occur by calling the office or tweeting us @NWSTallahassee. && .PRELIMINARY POINT TEMPS/POPS... Tallahassee 70 82 70 89 / 80 100 40 10 Panama City 70 81 72 85 / 80 100 30 10 Dothan 67 82 68 85 / 70 100 20 10 Albany 66 80 68 84 / 80 100 40 10 Valdosta 68 82 70 87 / 90 90 40 20 Cross City 69 85 70 86 / 70 70 80 50 Apalachicola 71 81 74 83 / 70 90 50 20 && .TAE WATCHES/WARNINGS/ADVISORIES... FL...Flood Watch through Tuesday evening for FLZ007>019-026>029-108- 112-114-115-118-127-128. High Rip Current Risk through Tuesday evening for FLZ108-112-114- 115. Wind Advisory until 5 PM EDT /4 PM CDT/ this afternoon for FLZ108-112-114. GA...Flood Watch through Tuesday evening for GAZ155-156. AL...None. GM...Small Craft Advisory from 11 AM Tuesday to 8 AM EDT Wednesday for GMZ730-755-765-775. Small Craft Advisory from 5 AM Tuesday to 7 AM CDT Wednesday for GMZ750-752-770-772. && $$ NEAR TERM...Haner SHORT TERM...IG3 LONG TERM....IG3 AVIATION...Haner MARINE...IG3 FIRE WEATHER...Haner HYDROLOGY...IG3