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Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
Issued by NWS Houston/Galveston, TX
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601 FXUS64 KHGX 111729 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 1229 PM CDT Thu Jul 11 2024 ...New AVIATION... .SHORT TERM... (Today through Friday Night) Issued at 309 AM CDT Thu Jul 11 2024 The current synoptic pattern, largely characterized by a mild but steady onshore flow and daily rainfall chances driven mainly by diurnal heating, will prevail through the remainder of the week. A slight retrograde of the prevailing surface high offshore of the Eastern Seaboard will promote a more uniform southeast wind, though an overall weak pressure gradient will keep wind speeds light. Meanwhile, a weak but nonetheless present stationary boundary will remain situated just offshore, enhancing the potential for diurnally driven showers and storms this afternoon. Have maintained PoP values in the 40-60% range this afternoon for areas along and south of the I-10 corridor, with expected storm coverage looking to be similar to that of yesterday. High temperatures, while remaining near seasonal normal values (low to mid 90s), will nonetheless aggravate the risk for heat-related illnesses due to the ongoing widespread power outages across Greater Houston. With heat index values again rising into the triple digits, a Heat Advisory has once again been issued in consideration of the post-storm conditions. If planning any outdoor work today, remain aware of the signs of heat related illnesses, stay hydrated, plan work to avoid the hottest parts of the day, and use municipal cooling centers if available. Friday is shaping up to be a similar day to today, with rainfall chances concentrated along the immediate coast and highs generally in the lower 90s. Another Heat Advisory may be needed depending on the ongoing power outage situation. For both tonight and tomorrow night, expect lows to sit in the upper 70s to around 80. Cady && .LONG TERM... (Saturday through Wednesday) Issued at 309 AM CDT Thu Jul 11 2024 The overall long term period can be summarized by saying there will be a chance for showers and storms nearly every day along with a gradual warming trend...but y`all are stuck with me on the forecast desk so we`re gonna take a deeper dive and discuss exactly why that is. Let`s get started! We pick things up on Saturday, which is when we have the highest rain chances for the forecast period. Lingering deeper moisture (PW values greater than 2.0") continues to sit over Southeast TX along with PVA from a nearby upper level inverted trough. Combine that with daytime heating and sea breeze/outflow boundary interactions and we should see some decent coverage of afternoon showers and storms. Daytime temperatures on Saturday start out in the low 90s...and it doesn`t get any "cooler" than that going forward. On Saturday night, upper level high pressure over the southeastern CONUS expands westward and increases 500mb heights over Southeast TX to around 594-596 dam. This does grant us a degree or two bump in our high temperatures on Sunday and Monday, but it also significantly drops rain chances due to the increased subsidence aloft. We`ll go from rain chances peaking around 60% on Saturday down to 30% on Sunday and less than 10% on Monday (sad stonks). Things get a little bit interesting on Monday as the previously mentioned upper level inverted trough drifts into the TX panhandle and evolves into an embedded upper level low. The main implications from this is decreasing our 500mb heights a bit which brings back our typical summertime pattern of shower/storms developing along the seabreeze in the afternoon and dissipating after sunset beginning again on Tuesday. So, locations near and south of I-10 will have the best chances of seeing rainfall through midweek. While we were talking about rain chances, that warming trend kept on truckin` along and now we`re looking at high temperatures in the mid to upper 90s by midweek. Some portions of the Brazos Valley may even flirt with the 100F mark. It`s a verrry early look, but we`ll have to monitor heat index values around midweek as they look to at least approach the Heat Advisory threshold ( 108F). Batiste && .AVIATION... (18Z TAF Issuance) Issued at 1223 PM CDT Thu Jul 11 2024 SHRA/TSRA developing along the sea breeze boundary in our coastal counties should push northward this afternoon. Right now we show VCTS as far north as CXO. Models disagree regarding how far north TC activity will extend before the loss of daytime heating weakens the storms. SHRA/TSRA possible again tomorrow, especially from IAH south to the coast. Chance of rain increases in the morning. But uncertainty exists regarding SHRA/TSRA coverage. For now, we opted for VCSH in the TAFs tomorrow. Winds should remains light with mostly VFR cigs/vis. The exception will be in locations experiencing a thunderstorm. Patchy fog cannot be ruled out tonight in areas that receive rainfall. However, confidence is low regarding patchy fog development. && .MARINE... Issued at 309 AM CDT Thu Jul 11 2024 Overall a relatively benign period of marine conditions continues with light to occasionally moderate onshore flow and 2-3 foot seas persisting into early next week. Most days throughout the forecast period will feature a chance for isolated to scattered showers and thunderstorms (especially on Saturday), and mariners can expect locally higher winds and seas near and within any thunderstorms. Batiste && .HYDROLOGY... Issued at 309 AM CDT Thu Jul 11 2024 As of early Thursday morning, there are three Flood Warnings in effect following the heavy rainfall and subsequent runoff from Hurricane Beryl. The Tres Palacios River at Midfield crested in major stage on Tuesday and is continuing to recede...it is forecast to fall below flood stage by early Friday morning. The San Bernard River at Boling crested in minor flood stage Tuesday and has fallen back into action stage, but it is expected to have a secondary crest into minor flood stage this afternoon. Lastly, Cypress Creek at Sharp Road in western Harris County remains above flood stage and it may take a day or so to recede. There are a couple more sites that may need Flood Warnings at some point over the next few days. The East Fork of the San Jacinto River at New Caney is expected to crest into minor flood stage late this evening and into the weekend. The Trinity River at Moss Bluff is forecast to barely crest into minor flood stage over the weekend. The excessive rainfall from Beryl along with subsequent unrelated rounds of rainfall have left portions of Matagorda, Brazoria, Fort Bend, Galveston, and Harris counties with above normal soil moisture. With rain chances remaining elevated (~40+%) through Saturday, it`s important to note that additional rainfall in these areas will turn into runoff quickly. Remember to heed any instructions from your local officials and to NEVER travel through ANY flooded areas or roadways. TURN AROUND, DON`T DROWN. Please monitor updated forecasts via the NWS NWPS webpage (https://water.noaa.gov/). Batiste && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 74 93 74 94 / 10 30 0 30 Houston (IAH) 76 91 76 93 / 30 60 10 50 Galveston (GLS) 81 88 81 89 / 50 50 20 40 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...Heat Advisory until 8 PM CDT this evening for TXZ163-164-176>179- 195>200-210>214-226-227-235>238-300-313-335>338-436>439. High Rip Current Risk until 10 PM CDT this evening for TXZ436>439. GM...None. && $$ SHORT TERM...Cady LONG TERM....Batiste AVIATION...Self MARINE...Batiste