Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
Issued by NWS Houston/Galveston, TX
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259 FXUS64 KHGX 311144 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 644 AM CDT Fri May 31 2024 ...New AVIATION... .SHORT TERM... (Today through Saturday Night) Issued at 142 AM CDT Fri May 31 2024 The active weather will continue through Saturday with multiple rounds of strong to severe storms possible thanks to numerous shortwaves passing through the zonal flow aloft. The first round is already on our door step, expected to move into the Piney Woods/Brazos Valley area by 2 to 4am. The severe potential is not high with these storms as the area has been worked over pretty well from last evening`s thunderstorms. But, we could still see some wind gusts to around 30 to 40mph and small hail possible. The next MCS is located a bit further west, about halfway between Abilene and Waco as of 2am, and the trajectory of this line is currently bringing it down along the Brazos River through SE Texas closer to daybreak. Now this area hasn`t seen the same number of storms that the rest of the region experienced yesterday, so the potential for strong to severe thunderstorms is higher with this MCS than the storms moving through the Pineywoods this morning. Guidance is also indicating that another MCS may move through the region this afternoon with additional showers and storms developing overnight tonight into Saturday. But, confidence on the where, when, and strength of these additional storms is unusually low at this time. This uncertainty is due to figuring out the the exact timing and location of the passing shortwaves, how much the atmosphere can recharge between rounds, and mesoscale features (boundary interactions) that is impossible to accurately predict this far out. All-in-all a very messy forecast. SPC maintains a Slight Risk (level 2 of 5) for most of SE Texas today due to the MCS potential. Damaging winds will be the main concern, but hail and a brief tornado cannot be ruled out. There is also a Marginal Risk (level 1 of 5) for Saturday, again with strong winds being the primary threat. There is also the potential for locally heavy rainfall this morning through this afternoon with the MCSs passing through. These storms will be fairly progressive, but could produce rainfall rates of 1-3" per hour or higher. Minor urban and small stream flooding would be the primary concern, but cannot out rule some areas experiencing flash flooding. WPC has placed most of SE Texas in a Slight Risk (level 2 of 4) for Excessive Rainfall today, and then most areas north of I-10 in a Marginal Risk (level 1 of 4) on Saturday. Temperature forecast for this afternoon is also tricky due to the uncertainty of the storms timing/locations. Expecting afternoon high temperatures to be in the mid to upper 80s, but could see some spots reach the low 90s if enough sunshine can peak through. Overnight low temperatures will continue to be on the unseasonably warm side, especially along the coast, with overnight minimum temperatures in the mid to upper 70s inland and low 80s along the immediate coast. High temperatures tomorrow should rise into the upper 80s to low 90s for most of the area as precipitation coverage should be less. Fowler && .LONG TERM... (Sunday through Thursday) Issued at 142 AM CDT Fri May 31 2024 We will continue to have additional rounds of showers and thunderstorms through early next week as a few more upper level disturbances embedded in the quasi-zonal flow aloft move across Southeast Texas. We may also continue to see several storms from Central and North Texas pushing into our region from time to time. On Sunday, we could be seeing isolated to scattered showers and isolated thunderstorms as a short wave passes through Texas and combines with sufficient low moisture, instability along with vort maxes pushing across the our area and possibly a low level jet. On Monday, although conditions look good for the development of storms, it seems we may stay capped enough to limit activity. A similar pattern could occur on Tuesday, although it does seem a little more favorable for rain in the afternoon and early evening hours. There is some model inconsistency on Wednesday, but global models are hinting at the passage of an upper level trough moving across the Southern Plains which could try to push a weak cold front close to Southeast Texas, and if it does move into our local area, it could stall over us. There is a chance the boundary meanders over us on Thursday and may help the development of some isolated showers and thunderstorms in the afternoon as the upper level trough moves across the eastern Texas region. Unfortunately, the models have been performing very poorly with the current weather trend, especially with timing. Thus, the forecast may undergo a few modifications during the next few days given that it has been a bit tricky to pin point the time of the day or night and exact location of some of these storms. With respect to temperatures, we will see highs in the upper 80s to low 90s on Sunday and then gradually warn through mid week where we will have highs in the low to mid 90s. The lows will be generally in the mid to upper 70s, a little cooler in some spots along the Brazos Valley and Piney Woods region. 24 && .AVIATION... (12Z TAF Issuance) Issued at 629 AM CDT Fri May 31 2024 A line to strong to severe thunderstorms is moving through the area this morning. Has already passed through CLL and UTS, will be passing through IAH and CXO shortly, and then down through the coastal terminals through the mid morning. Expect heavy rainfall, gusty winds to 30-40kt, and low CIGs down to around 1000ft as the line moves through. Popup thunderstorms will precede the line of storms, and then expected SHRA for a couple of hours after the line moves through. There will be a lull in the showers and thunderstorm activity, but may again see some showers and isolated thunderstorms this afternoon. VFR conditions will generally prevail through the day today, then MVFR conditions are expected tonight into Saturday morning as CIGS lower to 1500-2500ft with patchy fog possible. Additional showers and storms will be possible Saturday morning and afternoon. Fowler && .MARINE... Issued at 142 AM CDT Fri May 31 2024 Light to moderate onshore winds and seas of 4 to 6 feet can be expected through the next few days and may become moderate to strong briefly at times. Caution flags may be needed from time to time. Periods of showers and storms are expected today into this weekend. Some storms could be strong to severe, capable of producing strong gusty winds and higher seas. There is a chance for strong rip currents along the Gulf facing beaches during the next couple of days. Beachgoers should exercise caution in the waters and follow beach flags and lifeguard guidance. 24 && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 86 73 88 75 / 80 30 50 10 Houston (IAH) 87 76 88 76 / 70 40 60 10 Galveston (GLS) 86 80 86 80 / 50 40 40 20 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...None. GM...Small Craft Advisory until 10 AM CDT this morning for GMZ330-335- 350-355. Small Craft Should Exercise Caution from 10 AM CDT this morning through this evening for GMZ330-335-350-355. Small Craft Should Exercise Caution through this evening for GMZ370-375. && $$ SHORT TERM...Fowler LONG TERM....Cotto (24) AVIATION...Fowler MARINE...Cotto (24)