Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
Issued by NWS Houston/Galveston, TX
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993 FXUS64 KHGX 282259 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 559 PM CDT Sun Apr 28 2024 ...New AVIATION... .SHORT TERM... (This evening through Monday Night) Issued at 405 PM CDT Sun Apr 28 2024 ...TORNADO WATCH IN EFFECT UNTIL 9 PM TONIGHT... ...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING... Light showers are currently ongoing across portions of SE Texas this afternoon, with stronger/severe storms ongoing over portions of Northeast Texas. SPC`s mesocale analysis depicts ample instability across SE Texas, with SFC CAPE values of 2500-4000 J/KG, 3km ML CAPE of 5-150 J/KG. MU LIs of -6 to -8, LCL heights of 500-1000m, and midlevel lapse rates of 6.5-7.5 DegC/km. Ample shear remains present throughout the region as well, with Effective Bulk shear around 40- 50 knots and 3km SRH of 150-250 m2s2. 3km EHI values range from 3-5, Supercell Composite values of 8-12, Sig Tor Parameter values of 1-2, and Large Hail Parameter values of 8-16. Enhanced Stretching Potential values of 1-2 are currently focused west of I-45 just north of the US-59 corridor right now, coinciding with higher VTP values of 2-4. Model consensus and current observations suggest isolated/scattered shower/thunderstorm development across SE Texas this afternoon, with a larger line/cluster of storms forming this evening over portions of the Brazos Valley/Piney Woods along a frontal boundary. This complex of thunderstorms should move east/southeasterly overnight, pushing offshore Monday morning. A Tornado Watch is in effect for areas north of the US-59 corridor until 9 PM Tonight. These discrete storms will be capable of producing all severe hazards, including damaging winds, large hail, and even a few tornadoes. Additionally, these storms will also be capable of producing locally heavy rainfall, with some models suggesting the potential for training storms. A Flood Watch is currently in effect across the northern third of our CWA until 10 AM Monday. Rainfall totals will largely be up to 2" though isolated higher amounts of 3-5" or higher will be possible. Locations outside of the current watch areas will still be under a Marginal to Slight Risk of Severe Weather/Excessive rainfall tonight into Monday morning. Keep an eye on the forecast for additional updates, and be sure to have multiple ways of receiving warnings tonight. The severe weather & heavy rainfall threat come to an end on Monday as this complex of thunderstorms pushes offshore. Isolated showers & storms will be possible Monday night/early Tuesday due to lingering moisture. Otherwise, expect much more benign weather with highs in the 80s and lows in the 60s to lower 70s. 03 && .LONG TERM... (Tuesday through next Saturday) Issued at 405 PM CDT Sun Apr 28 2024 With an active west to southwest flow aloft, a series of disturbances will be moving across the area through much of this period. With precipitable water values remaining on the elevated side, a persistent onshore flow, and a stalling cold front, look for periods of showers and thunderstorms across the area for much of the week, generally higher inland (up north) and lower closer to the coast. Each day, expect high temperatures in the 80s and low temperatures in an upper 60s to lower 70s range. 42 && .AVIATION... (00Z TAF Issuance) Issued at 559 PM CDT Sun Apr 28 2024 Shower/thunderstorm development increasing across the northern half of Southeast Texas. Embedded strong-severe cells will be capable of producing all wx modes (strong winds, hail, heavy rain and isolated tornadoes). Look for this activity to become more organized/linear this evening...eventually tracking into the metro area overnight (6-10z) and toward the coast thereafter. Prevailing MVFR cigs will become IFR in/near the strongest cells. May see some fog/low cig develop once the precip passes late tonight followed by gradual improvement into the mid-late morning hours Mon. VFR areawide during the afternoon. 47 && .MARINE... Issued at 405 PM CDT Sun Apr 28 2024 Moderate to strong onshore winds (still at around 20 knots this afternoon) and hazardous seas (10 feet at Buoy 42019 at 2 PM CDT) will continue through late tonight. Minor coastal flooding is expected in vulnerable locations at times of high tide (mainly during the day today). There is a chance of showers and thunderstorms, with the best chances from this evening through Monday morning, and then again during the day on Tuesday (look for higher winds/seas/bays in and near any storms). Winds will gradually decrease late tonight into Monday, with lingering high seas keeping conditions hazardous through much of the day on Monday. Generally moderate onshore flow will persist through the rest of the upcoming week. 42 && .HYDROLOGY... Issued at 405 PM CDT Sun Apr 28 2024 A Flood Watch is in effect for portions of the Brazos Valley and the Piney Woods through 10AM CDT on Monday morning. Widespread showers and thunderstorms will develop and move through portions of Southeast Texas this afternoon into tonight. Some of these storms may become strong to severe and produce heavy rainfall (rainfall rates up to 2-2.5"/hr) that may lead to localized flooding especially in low-lying areas or areas with poor drainage. Generally expecting widespread rainfall totals around 2", but pockets of 3-5+" inches will be possible especially if storms train over the same locations repeatedly. The bulk of the heavier rainfall looks to push out of the watch area by sunrise on Monday morning, so the Flood Watch may be cancelled a few hours early. There are currently no River Flood Warnings in effect. The Trinity River at Moss Bluff (MBFT2) fell below minor flood stage a short while ago, so that River Flood Warning was cancelled. Additional rainfall is expected this afternoon and tonight with the greater confidence for higher rainfall totals along the Upper Trinity River. As a result, we`ll need to monitor observations and forecasts along this basin for impacts from the heavy rain and its subsequent runoff. You can monitor current and forecast conditions at this weblink: water.weather.gov/ahps2/forecasts.php?wfo=HGX Batiste && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 70 86 68 84 / 100 10 10 30 Houston (IAH) 72 86 71 84 / 90 50 20 50 Galveston (GLS) 73 80 72 79 / 70 80 20 50 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...Flood Watch through Monday morning for TXZ163-164-176>179-195- 196-198. Coastal Flood Advisory until 10 PM CDT this evening for TXZ214- 313-337-338-437>439. Beach Hazards Statement until midnight CDT tonight for TXZ436>439. GM...Small Craft Should Exercise Caution until midnight CDT tonight for GMZ330-335. Small Craft Advisory until midnight CDT tonight for GMZ350-355. Small Craft Should Exercise Caution from midnight tonight to 5 AM CDT Monday for GMZ350-355. Small Craft Advisory until 5 AM CDT Monday for GMZ370-375. && $$