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Area Forecast Discussion
Issued by NWS Birmingham, AL
Issued by NWS Birmingham, AL
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805 FXUS64 KBMX 121152 AFDBMX Area Forecast Discussion National Weather Service Birmingham AL 652 AM CDT Mon Aug 12 2024 ...New AVIATION... .SHORT TERM... (Today through Tuesday) Issued at 349 AM CDT MON AUG 12 2024 Today will be similar in some respects to yesterday for high temperatures, but mainly a degree or so warmer. We should keep the lower dew points around during the short term with NRLY low level flow remaining in place. A surface ridge extends from Central Canada into the Northern Plain states and SEWD into much of ERN Conus. The stationary front that we have been talking about the last few days remains to our S along the Gulf Coast, and it is expected to remain generally in this area through the short term. We could see some periodic high clouds at times as the flat upper ridge across the SRN US transitions to a weak NW flow into the SE US. This will result as an upper low over Quebec digs and treks across New England through the short term. Look for only minor differences for Tuesday from today as dew points and temperatures slowly moderate and creep back up, but we still remain rain free through the daytime on Tuesday. 08 && .LONG TERM... (Tuesday night through Sunday) Issued at 349 AM CDT MON AUG 12 2024 A shortwave associated with convection will move southeastward Tuesday night, but the signal for MCS progression has waned. This is in part due to a weakening trend in moisture advection from the west ahead of this activity. However, a remnant outflow boundary could move in from the north Wednesday morning and afternoon with some opportunity to generate isolated showers and perhaps a few thunderstorms. Mid-level cloudcover and a slightly cooler airmass behind the boundary may keep temperatures depressed by a few degrees across our northern half. There is good model agreement for Thursday as a strong ridge axis moves in from the west. Anticyclonic curvature of flow at 500 mb is suggestive of subsidence, and only very isolated convection appears possible Thursday afternoon. Models begin to disagree on Friday with the evolution of a trough to north and northwest. The GFS is quite aggressive with height falls Friday afternoon and over the weekend while the ECMWF is more gradual. Either way, rain chances should increase for Friday and/or Saturday in association with a cold front. Timing of potentially organized convection remains unclear. If the front sweeps through forcefully as shown by the GFS, a cooler and drier airmass would move into the region on Sunday. 87/Grantham && .AVIATION... (12Z TAFS) Issued at 650 AM CDT MON AUG 12 2024 VFR conditions will continue for the next 24 hours as we continue with surface ridging. Periodic mid/high fair weather clouds and unrestricted vsbys are expected. Winds will pick up over the next few hours with daytime mixing from NW at ~ 5-8kt. For tonight with continued subsidence, look for winds to become light/variable to near calm once again. 08 && .FIRE WEATHER... A relatively dry airmass will remain in place over Central Alabama through Tuesday with afternoon RH values ranging from 35 to 45 percent. 20 foot winds will be from the north to northwest between 5 and 10 mph. A slow increase in moisture and rain chances will begin on Wednesday. && .PRELIMINARY POINT TEMPS/POPS... Gadsden 90 67 93 69 / 0 0 0 10 Anniston 91 67 93 69 / 0 0 0 10 Birmingham 91 70 93 72 / 0 0 0 10 Tuscaloosa 92 70 95 72 / 0 0 0 10 Calera 91 70 93 72 / 0 0 0 10 Auburn 93 72 96 73 / 0 0 0 10 Montgomery 95 72 97 74 / 0 0 0 10 Troy 94 72 96 72 / 0 0 0 10 && .BMX WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...08 LONG TERM....87/Grantham AVIATION...08