Area Forecast Discussion
Issued by NWS Lake Charles, LA
Issued by NWS Lake Charles, LA
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689 FXUS64 KLCH 022228 AFDLCH Area Forecast Discussion National Weather Service Lake Charles LA 528 PM CDT Sun Jun 2 2024 ...New AVIATION... .SHORT TERM... (Tonight through Tuesday night) Issued at 330 PM CDT Sun Jun 2 2024 Mid-afternoon sfc analysis shows high pressure centered off the Carolina coast remaining in control with a srly low-level flow generally in place. Water vapor imagery shows weak troffing trying to take over the wrn Gulf region, with the ridge axis currently extending from cntl Mexico nnewd to the cntl Plains. Meanwhile, we continue to see shortwave activity rounding the ridge...one impulse is noted departing the region while another can be seen upstream entering the Red River Valley. Earlier convection which was helped in part by the initial vort has largely moved out of the area, although additional convection is now developing with heating along with resultant mesoscale/outflow boundaries. Otherwise, sfc obs/satellite imagery show a variably cloudy and seasonably warm day ongoing across the area. With a somewhat diurnal pattern now in place, expecting this afternoon`s convection to again linger into the evening hours before sunset/loss of heating leads to a gradual dissipation. The main fly in the ointment is a developing MCS churned out by the upstream shortwave currently impacting the Texoma region. None of the guidance is super excited by the idea of this activity holding together to push into the area later this evening...but with the CAMs not performing very well of recent, will certainly have to watch how this upstream feature plays out. Meanwhile, with such abundant boundary layer moisture available, along with relaxing winds, patchy fog development looks possible late tonight, mainly I-10 nwd where lighter winds are anticipated. Today`s forecast for Monday show a little better rain chances than previous days as the shortwave responsible for the upstream convection will temporarily shunt ridge development over the wrn Gulf region. And combined with good Gulf moisture remaining in place (forecast soundings indicating mean RH values to 60 percent and PWAT values exceeding 1.7 inches), widely scattered convection is expected again with heating during the afternoon hours (POPs look a little higher over the Atchafalaya Basin where capping is expected to be least). Whatever convection develops should again diminish with sunset. Tuesday is looking like a bit of a repeat, although with a drier wrly mid-level flow now in place, rain chances look a little slimmer despite the likely approach of yet another shortwave aloft. 25 && .LONG TERM... (Wednesday through next Saturday) Issued at 330 PM CDT Sun Jun 2 2024 A repetitive, seasonal forecast looks to persist throughout the long term as the synoptic pattern remains fairly stagnant. On Wednesday, a deepening trough over the northern Plains/Canada will slide east creating a large scale weakness across the E CONUS, while to our west, ridging will be gradually building over the Rockies/Four Corners region. From Thurs into Sat the trough will dive towards New England while ridging will build east across TX. This will result in mainly light NW flow aloft over the forecast area throughout the long term period. At the surface, weak high pressure to our east will result in a light onshore flow throughout most of the period. Only exception will be late Fri when a weak boundary looks to move into the area resulting in a brief period of variable to westerly flow. With ridging to our west and little in the way of forcing aloft, daily shower and thunderstorm activity will be minimal throughout the long term, and any convection will be largely driven by daytime heating. NBM paints 15-20% POPs for each afternoon through the end of the weekend to account for these typical diurnally driven thunderstorms. Temperature wise, daytime highs should warm into the lower 90s each day, while overnight lows will fall into the low to mid 70s, which is near seasonal norms. In addition, apparent temps/heat indices should peak in the upper 90s to lower 100s each day. 17 && .AVIATION... (00Z TAFS) Main area of strong to severe TSRA over Western Louisiana along remnant outflow boundary far away from terminals, so will be ending the VCTS at this time. Otherwise, MVFR ceilings expected by 09z through 15z. Southeast winds 10-12 kts expected to remain elevated around 5-7 kts later this evening and overnight, increasing by 15z to 8-10 kts, and becoming south 12-16 kts with gusts 20-24 kts by 18z Monday. Higher chances (30-40%) of TSRA for eastern terminals Monday afternoon, with VCTS beginning around 17-18Z with a PROB30 group from 19-24z for all sites. && .MARINE... Issued at 330 PM CDT Sun Jun 2 2024 Onshore flow is expected to begin gradually increasing tonight, with caution conditions forecasted by Monday night as the gradient tightens thanks to lower pressures over the srn Plains. These elevated winds are progged to linger into mid-week before settling. 25 && .PRELIMINARY POINT TEMPS/POPS... AEX 70 89 73 91 / 30 30 20 20 LCH 75 88 77 88 / 30 20 10 10 LFT 76 90 77 91 / 40 40 20 20 BPT 76 90 77 91 / 10 10 10 10 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...None. TX...None. GM...None. && $$ SHORT TERM...25 LONG TERM....17 AVIATION...08