Area Forecast Discussion
Issued by NWS Shreveport, LA
Issued by NWS Shreveport, LA
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521 FXUS64 KSHV 270544 AFDSHV Area Forecast Discussion National Weather Service Shreveport LA 1244 AM CDT Fri Sep 27 2024 ...New AVIATION... .UPDATE... Issued at 953 PM CDT Thu Sep 26 2024 Clear skies and plenty of dry air aloft will keep conditions quiet and cool this evening as temperatures are on pace with the afternoon package to once again fall into the lower 60`s, with some upper 50`s scattered into the mix. As a result, not proposing any changes to the overnight forecast with this evening update. Only adjustment was to QC the hourlies to match recent trends, which resulted in little to no correction to the currently advertised forecast. KNAPP && .SHORT TERM... (This evening through Friday Night) Issued at 249 PM CDT Thu Sep 26 2024 Mostly clear skies with only a few clouds have dominated ArkLaTex skies today and look to continue to do so overnight, while prevailing northerly winds and a much drier air mass than we have recently experienced work together with the clear skies to plunge low temperatures into the upper 50s and lower 60s, a pleasant and very literal breath of fresh air as we begin to cast off the tedious oppressive heat and humidity of summer. However, before the much-anticipated fall-like conditions can prevail, a last few wx grids bear mentioning. While our upper level trough forms a large and deep closed low over eastern Arkansas and western Tennessee, Hurricane Helene will be approaching landfall along the Florida panhandle, overnight tonight into tomorrow morning. Long-range forecast models have been persistent in depicting suggested a Fujiwara effect resulting from their interaction. Specifically, as Helene approaches land and intensifies, its presence will help amplify the middle Mississippi low upon approach. As Helene moves inland, it looks to get picked up by the circulation surrounding the middle Mississippi low, and swung around to the northwest over the Ohio Valley before ultimately getting absorbed by the Mississippi low. The effects of this pattern on ArkLaTex weather will take the form of a few rounds of showers and storms across our northeastern zones Friday afternoon, swept in from the north on the western fringes of the upper level closed low to our northeast. The latest guidance keeps this activity mostly to the north of the I-20 corridor, primarily impacting DeQueen down towards El Dorado, with the possible exception of some slight chances diving south towards Monroe Friday afternoon. This activity looks to dissipate late Friday evening, lifting north and east overnight, with quiet conditions to follow. In a nutshell, the dry airmass introduced this week by our recent cold front will stick around, allowing for warm afternoons and pleasantly cool mornings. /26/ && .LONG TERM... (Saturday through next Wednesday) Issued at 249 PM CDT Thu Sep 26 2024 After Hurricane Helene gets absorbed by the upper level low over the Mississippi Valley, which looks to occur during the day Friday, the resulting low will deepen considerably, depicted with 560 dam heights in the GFS solution, along with closed isoheight lines reaching from Chicagoland to the Gulf Coast. Despite the formidable appearance of this feature in upper level analysis, its pressure center looks to migrate northeast from the Tennessee Valley to the Ohio Valley as it reorganizes itself. This propagation will slide the whole system far enough northeast to release the ArkLaTex from its grasp by the start of the weekend, with dry and quiet conditions prevailing through to the end of this extended forecast period. High temperatures may manage to rebound into the upper 80s to lower 90s by the end of the period but should not much exceed seasonable values, with corresponding lows remaining in the upper 50s to lower 60s throughout. /26/ && .AVIATION... (06Z TAFS) Issued at 1238 AM CDT Fri Sep 27 2024 VFR conditions to persist across area terminals through the forecast period ending 28/06Z. With an increased pressure gradient across the region, expect northwest winds 10 to 15 knots with higher gusts today, diminishing to around 5 knots after 28/00Z. Otherwise, could see mid-level ceilings around 10K feet developing across MLU/ELD after 27/18Z due to the remnants of a dissipating tropical system to the northeast. /05/ && .PRELIMINARY POINT TEMPS/POPS... SHV 86 66 87 66 / 10 0 0 0 MLU 85 65 87 64 / 20 10 0 0 DEQ 82 61 83 61 / 20 10 0 0 TXK 84 64 85 64 / 20 10 0 0 ELD 83 63 83 61 / 30 10 0 0 TYR 86 64 87 63 / 0 0 0 0 GGG 85 63 86 62 / 10 0 0 0 LFK 86 64 88 62 / 0 0 0 0 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...None. LA...None. OK...None. TX...None. && $$ SHORT TERM...26 LONG TERM....26 AVIATION...05