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Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
Issued by NWS Houston/Galveston, TX
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068 FXUS64 KHGX 111115 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 615 AM CDT Sun Aug 11 2024 ...New UPDATE, AVIATION... .UPDATE... Issued at 615 AM CDT Sun Aug 11 2024 This is more of an astronomical update than a meteorological one, but with quiet weather persisting this`ll at least be something worth looking at in the sky. With mid-level high pressure continuing to provide plenty of subsidence aloft, skies will be mostly clear to clear heading into tonight. Tonight just so happens to the peak of the Perseid meteor shower with the best viewing being the pre- dawn hours on early Monday morning (~4-6am). If you`re going to make plans to go outside and look towards the stars, just be aware that it`ll be humid and that overnight temperatures will be in the upper 70s to low 80s...and that`s just before sunrise. Batiste && .SHORT TERM... (Today through Monday Night) Issued at 256 AM CDT Sun Aug 11 2024 A quasi-stationary frontal boundary will either be just east of Southeast TX or over far eastern Southeast TX throughout most of the day. This front isn`t expected to make it as far west as the I-45 corridor, but it won`t do much anyway other than reinforce some drier air that`s already in place. With PW values generally in the 1.7-1.9" range, we`ll remain below the 75th percentile (~2.04"). This means that even though we`ll have another day of high temperatures in the upper 90s again, the relatively dry air in place will keep heat indices in the 103-107F range. Mid-level high pressure remains overhead with 500mb heights around 594 dam. Combine the climatologically drier air in place with a subsidence inversion layer aloft around 850mb, and it`s easy to see why today`s PoPs are no higher than 10-15%. The best chances to see a rogue shower will be south of I-10 and west of I-45. Things will change a bit on Monday, and that change can be mainly attributed to increasing moisture. PW values increase on Monday to around 1.9-2.1"...and that`ll have impacts on both rain chances and heat indices. Let`s talk about rain chances first. A shortwave looks to sneak beneath the ridge on Monday afternoon, which is perfect timing to combine with the seabreeze to help lift the increased moisture. There will still be a subsidence inversion layer aloft, but with an added source of lift and more moisture in place, some isolated to scattered showers/storms are expected to develop in the afternoon. The best chances for seeing rain on Monday will be south of I-10, but a few members of the 00Z CAMs show some convective potential extending north of I-10 as well. Temperatures will be in the upper 90s once again, but with increased moisture/humidity comes increased heat indices. Heat indices on Monday will top out in the 106-110F range, so a Heat Advisory may be needed for some portions of Southeast TX...and that might be the start of another Heat Advisory streak (small spoiler for the long term). As heat indices continue to top out near the Heat Advisory criteria ( 108F), please continue to keep heat safety at the forefront of any plans that you make (especially if outdoors). Know the signs of heat related illnesses (heat stroke/heat exhaustion), drink plenty of water to stay hydrated, take frequent breaks from the heat, avoid strenuous outdoor activities during the hottest part of the day, wear sunscreen and loose/light-colored clothing, and ALWAYS ALWAYS ALWAYS LOOK before you LOCK your vehicle. Don`t forget about your pets as well! If the ground is too hot for the palm of your hand, then it is too hot for their paws. Batiste && .LONG TERM... (Tuesday through Saturday) Issued at 256 AM CDT Sun Aug 11 2024 There will be some slight repositioning of both the mid/upper level ridging across the area and the surface high pressure off to our east through this period, but not significant enough to make a dent in our mid-August summer heat. High temperatures each day will be in the upper 90s to around 100, and heat index values will be in a 107-113 range. Cannot rule out possible showers/thunderstorms each day mainly near and to the south of the I-10 corridor, associated with a sea breeze/bay breeze combo and weak disturbances aloft, but a majority of the area looks to stay dry, especially in the Wednesday through Saturday time period. Heat Advisories will likely be needed, and Excessive Heat Warnings will be possible. It is well worth repeating...please continue to keep heat safety at the forefront of any plans that you make (especially if outdoors). Know the signs of heat related illnesses (heat stroke/heat exhaustion), drink plenty of water to stay hydrated, take frequent breaks from the heat, avoid strenuous outdoor activities during the hottest part of the day, wear sunscreen and loose/light-colored clothing, and ALWAYS ALWAYS ALWAYS LOOK before you LOCK your vehicle. Don`t forget about your pets as well! If the ground is too hot for the palm of your hand, then it is too hot for their paws. 42 && .AVIATION... (12Z TAF Issuance) Issued at 615 AM CDT Sun Aug 11 2024 VFR conditions prevail throughout the TAF period with the exception of intermittent bouts of decreased visibilities due to patchy fog at LBX this morning (and potentially soon at CXO). Any fog that develops will dissipate by 14Z. Winds today will mainly be easterly to southeasterly around 5-10 knots, then become light and variable shortly after sunset. Batiste && .MARINE... Issued at 256 AM CDT Sun Aug 11 2024 Light winds and low seas will prevail. During the overnight hours, winds may intermittently increase to around 10 to 15 knots. Rain chances remain low. 42 && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 98 76 97 77 / 10 0 10 0 Houston (IAH) 99 80 98 79 / 10 0 20 0 Galveston (GLS) 92 83 91 82 / 10 0 20 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ SHORT TERM...Batiste LONG TERM....42 AVIATION...Batiste MARINE...42