Area Forecast Discussion
Issued by NWS Corpus Christi, TX
Issued by NWS Corpus Christi, TX
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272 FXUS64 KCRP 282019 AFDCRP Area Forecast Discussion National Weather Service Corpus Christi TX 319 PM CDT Sun Apr 28 2024 ...New SHORT TERM, LONG TERM, MARINE... .SHORT TERM... (Tonight through Monday night) Issued at 315 PM CDT Sun Apr 28 2024 Key Messages: Low chances for Severe Thunderstorms tomorrow As daytime heating diminishes tonight, so will rain chances across most of the area except for the Victoria Crossroads where medium to low rain chances will linger through midnight. As we head into tomorrow, conditions look less favorable for development due to the placement of the upper-level trough, however, PWAT values between 1.4-1.5" (around 75th percentile of climatology) and vorticity in the 700 and 850 mb levels will along with unstable atmosphere (SBCAPE 2,500-3,000 J/kg) will keep low chances of thunderstorms in the forecast. If a thunderstorm is able to develop, it will have the ability to become severe with damaging winds and hail as the primary hazards. Therefore, the Storm Prediction Center currently has all of South Texas under a Marginal Risk of severe thunderstorms tomorrow. Despite winds weakening to under 20 knots this afternoon and expected to drop under 15 knots tonight and tomorrow, coastal flooding is expected to continue through tomorrow evening as swell heights and periods remain elevated. As of this afternoon, Buoy 42019 was reporting swell heights of over 9 feet and periods just a tick over 9 seconds. Due to observations and webcams from portions of the bays and waterways showing elevated water levels, added the bays to the coastal flood advisory for tonight and tomorrow. Similarly, the rip current risk will also remain high tonight through tomorrow due to the elevated swells and periods. Please use caution if entering the water. Warm temperatures will continue tomorrow with much of South Texas in the mid to upper 80s while the Brush Country warms into the lower to mid 90s. Temperatures tonight and tomorrow night will remain mild with lows only dropping into the low to mid 70s. && .LONG TERM... (Tuesday through next Saturday) Issued at 315 PM CDT Sun Apr 28 2024 Key Messages: - Low chance of showers and thunderstorms expected this week - Minor coastal flooding possible through midweek Mid Term (Tuesday through Wednesday)...Not much has changed in the models since yesterday, with the idea of a warm, moist air mass (PWAT~1.50") that will stay over South Texas, and especially the Coastal Bend as sfc dewpoints hover around the lower 70s. So the main thing will be upper air pattern and the triggers to get something going. However, the 500 mb pattern is slightly ridged with small shortwave ripples in the flow. So a good(20-40%) chance for showers and thunderstorms through Tuesday afternoon. Although, the Low Res Ensemble Forecast brings the chance for rain up to 50% during the afternoon with the chance of >500J/kg CAPE&>-25 J/kg CIN&>30knots of bulk shear being 40%, the NBM numbers may be under doing it. Instability drops as we lose heating, so not expecting anything overnight, although a shower is possible (10% chance) overnight and going into Wednesday morning. Wednesday, models would suggest that the flat ridge would begin to break down and allow for slight chance pops (15-20%) in the morning, and low chance (15-30%) in the afternoon, especially in the Victoria Crossroads region. Winds are expected diminish Monday, and remain steady on Tuesday, although it could get gusty in the western Brush Country Tuesday night as the lee trough in northern Mexico tightens up the pressure gradient. That relaxes the gradient by 12z/Wed only to have the gradient tighten back up again, but not for most of the forecast area. Gusts only look to be 25-30 mph, but it will be breezy Wednesday. Extended (Wednesday night through Sunday)...Wednesday night into Sunday is expected to have isolated to scattered showers and thunderstorms with the PWAT around 1.5 or more (75th percentile for this time of year). So far nothing out of hand. Weak to moderate onshore flow will continue the threat for minor coastal flooding. && .AVIATION... (18Z TAFS) Issued at 1214 PM CDT Sun Apr 28 2024 MVFR conditions will continue prevailing this afternoon as showers and isolated thunderstorms move across the forecast area. As rain chances decrease late this afternoon into this evening, VFR conditions are expected to return. However, those VFR conditions will be short lived as MVFR conditions are expected to return once again tonight, especially across the eastern sites. && .MARINE... Issued at 315 PM CDT Sun Apr 28 2024 Winds are expected to weaken to 15-20 knots tonight and 10-15 knots tomorrow morning through tomorrow night. Despite winds weakening to under 20 knots, Small Craft Advisory conditions will remain in effect across the Gulf waters for seas of 7 feet or greater through tomorrow morning. Low to medium rain chances are expected to linger across the offshore waters through tomorrow night. There is a 15-40% chance of showers and thunderstorms daily across the waters through mid week. Winds Wednesday and Thursday will ramp up enough for small craft to exercise caution. && .PRELIMINARY POINT TEMPS/POPS... Corpus Christi 74 87 74 87 / 20 30 30 40 Victoria 72 88 71 85 / 40 30 20 50 Laredo 74 94 74 94 / 0 30 10 20 Alice 73 91 73 90 / 10 40 20 40 Rockport 75 83 74 84 / 30 30 30 40 Cotulla 71 93 73 94 / 0 10 10 10 Kingsville 74 89 74 89 / 10 40 20 40 Navy Corpus 75 83 74 84 / 20 30 30 40 && .CRP WATCHES/WARNINGS/ADVISORIES... TX...Coastal Flood Advisory until 7 PM CDT Monday for TXZ245-342>347- 442-443-447. High Rip Current Risk until 7 PM CDT this evening for TXZ345-442- 443-447. GM...Small Craft Advisory until 7 AM CDT Monday for GMZ250-255-270- 275. && $$ SHORT TERM...JCP/84 LONG TERM....JSL/86 AVIATION...JCP