Area Forecast Discussion
Issued by NWS Corpus Christi, TX
Issued by NWS Corpus Christi, TX
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114 FXUS64 KCRP 170522 AFDCRP Area Forecast Discussion National Weather Service Corpus Christi TX 1222 AM CDT Tue Sep 17 2024 ...New AVIATION... .SHORT TERM... (Tonight through Tuesday night) Issued at 201 PM CDT Mon Sep 16 2024 Moderate to heavy showers with an occasional thunderstorm have moved over the Brush Country continuing westward in association with an early strong storm outflow. The Brush Country is an untapped area of instability but weak lapse rates around 5-6 C/km from the KCRP 12Z sounding likely prohibits strong updrafts and therefore thunderstorms. This activity will continue west- northwest through the afternoon hours before waning into the evening as stability increases. Skies will become mostly clear across South Texas and low-level moisture will allow for a medium chance of fog development over the Victoria Crossroads. Although mid-upper level ridging will increase tonight into Tuesday and lead to drier northwesterly flow, moist low-level flow along with PVA from 850-700mb will stay intact over the southern half of the CWA (mainly south and west of I-37). We`ll keep a low 15-30% chance of showers and thunderstorms over the aforementioned area through the day on Tuesday with PWATs around 2.0". However, strong downdrafts from heavy showers may cause an outflow boundary that acts as a lifting mechanism for other cells to develop. Again, once we lose surface heating and stability increases Tuesday night, rain chances will quickly diminish. Lows tonight and Tuesday night range from the mid to upper 70s with highs on Tuesday in the low to mid 90s. Heat index values will peak around 105 in areas unfortunate to miss out on any rain/sky cover. && .LONG TERM... (Wednesday through next Sunday) Issued at 201 PM CDT Mon Sep 16 2024 Key Messages: - Morning and afternoon showers and storms possible (~30%) along the Coastal Bend much of the week - Moderate to Major risk of heat related impacts through Friday Ample moisture will remain in place across at least the southern half of the Coastal Bend through at least Thursday and potentially into the weekend as well. The GFS and its ensembles are drier than almost all other guidance, so throwing out that guidance, the rest are more aggressive with PWATs generally >2 inches through Thursday and then a little drier heading into the weekend. Lingering surface boundaries may still be in the area, but even if not, the combination of high moisture and ample instability, along with the sea breeze, should be more than enough to trigger at least a few showers and storms each day through Thursday and potentially into the weekend, though coverage would likely be less Friday and beyond as the best moisture leaves the area. Elsewhere, ridging will largely dominate with mostly benign weather conditions. The combination of warmer temperatures and higher dewpoints will continue to pose a threat as heat index values climb back into the 105-114 range. Heat Advisories may be required, with the warmest days expected to be Wednesday through Friday. The HeatRisk will be at Moderate to Major levels through the end of the work week. Therefore, heat related impacts will be possible. && .AVIATION... (06Z TAFS) Issued at 1009 PM CDT Mon Sep 16 2024 Tonight expect a transition to MVFR to visibilities to begin building in across the eastern TAF sites as low level moisture continues to filter in behind southeasterly flow. Periods of IFR to LIFR conditions will be possible at sites ALI and VCT around 09Z due relatively light winds under clear skies. This is expected to last through 13Z before transitioning to VFR. VFR conditions will be expected elsewhere. Similar to Monday, theres a low (10-30%) chance for showers and thunderstorms to develop in the afternoon into the evening hours Tuesday along the southern portions of the area from LRD to CRP. && .MARINE... Issued at 201 PM CDT Mon Sep 16 2024 Onshore flow will strengthen slightly to weak to moderate through next weekend. There is a low to medium (15-35%) chance of showers and thunderstorms daily. && .PRELIMINARY POINT TEMPS/POPS... Corpus Christi 75 91 77 92 / 10 20 0 30 Victoria 74 95 74 94 / 0 0 0 20 Laredo 75 93 77 95 / 20 20 0 10 Alice 74 93 75 95 / 0 30 0 20 Rockport 79 90 79 92 / 10 20 0 20 Cotulla 75 96 77 97 / 0 10 0 10 Kingsville 74 92 75 93 / 10 30 0 30 Navy Corpus 79 87 81 88 / 10 30 10 30 && .CRP WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ SHORT TERM...EMF LONG TERM....CLM AVIATION...NP/92