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Area Forecast Discussion
Issued by NWS Jackson, MS
Issued by NWS Jackson, MS
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449 FXUS64 KJAN 161732 AFDJAN Area Forecast Discussion National Weather Service Jackson MS 1232 PM CDT Fri Aug 16 2024 ...New AVIATION... .MESOSCALE UPDATE... Issued at 1013 AM CDT Fri Aug 16 2024 A few mid and upper clouds are hanging around this morning with little evidence of cumulus development just yet per visible satellite imagery. Anticipate as we continue to warm we`ll see convective development and eventually thunderstorms this afternoon. With very warm temperatures approaching 100 F in some places and deep boundary layer moisture, a few of these storms could be briefly stronger with gusty winds possible. The forecast looks on track and heat products were maintained. Adjustments forthcoming will likely include an extension of the heat advisory/excessive heat warning into Saturday. /86/ && .DISCUSSION... Issued at 414 AM CDT Fri Aug 16 2024 Today and Tonight: A moist tropical air mass remains in place across the Lower Mississippi River Valley today, with analyzed PW values of 1.8-2.0 inches this morning representing the 50-75th percentile range for mid August. An upper-level low pressure system is spinning over the upper Midwest this morning, and a shortwave trough rounding its base is sustaining thunderstorms along a frontal boundary that extends from near the Great Lakes back towards Oklahoma. Warm advection is ongoing south of the front, helping to bring the heat from the Southwest ridge toward our forecast area. High temps again today should be in the 97-101 range for most of the area, especially if rain can hold off until the afternoon. The moist air mass in the region is capable of supporting shower and thunderstorm development with daytime heating again today, and it appears that convergence along an outflow boundary from storms in the Interstate 40 corridor this morning may serve to trigger additional convection by this afternoon as the disturbance continues south and east. Additionally, air mass thunderstorms are possible as convective temps are met during the day. Storms will have 2500-3500 J/kg of SBCAPE and 1000+ J/kg of DCAPE to work with, so localized damaging winds are possible with any strong to severe storms. Wind shear is expected to be a little stronger to the north and this should add a little more organization to storms especially if they can hold together along the outflow boundary as it approaches from the north. There is a Marginal Risk for severe thunderstorms tied specifically to this possibility this afternoon and evening, but again it is worth noting some isolated microburst potential exists elsewhere too. /NF/ Saturday through next Thursday... By Saturday, deep layer ridging will continue to prevail over the Southern Plains/Lower Miss Valley region as a strong midlevel high pressure spins over the Rockies into the Southern Plains. At the surface, anticyclonic flow will continue to promote westerly flow into the ArkLaMiss region, keeping dangerous heat in the headlines through the remainder of the weekend. High temperatures in the upper 90s to triple digits as well as heat indices ranging 105-115 degrees will be expected. The highest potential for "Significant" to "Extreme" heat stress are expected along and west of the I-55 corridor. Overnight lows on Saturday are expected to remain in the upper to middle 70s, which will continue the dangerous heat stress conditions. By Sunday, surface ridging is expected to maximize across the region ahead of a "cold" frontal boundary. Sunday looks to be our hottest day this week, with many areas along and west of I- 20 reaching triple digit highs and heat indices. Excessive Heat Warning/Heat Advisory products will be likely on Saturday and Sunday as dangerous heat stress dominates the beginning of the extended period. In addition to heat, conditions for a Marginal Chance of severe storms will be possible (5-15% chance) on Saturday and Sunday. Enhanced westerly flow along with increased instability will create the potential for damaging wind gusts with with more mature updrafts. The main threat for severe storms looks to exists mostly in the afternoon into the late evening. By Sunday afternoon into the evening, an upper trough is expected to bring a weak frontal boundary into the region, allowing for lower temperatures and drier air to infiltrate the ArkLaMiss region. By Monday into the remainder of the extended period, a much needed break from dangerous heat will take place. High temperatures will range in the upper 80s to lower 90s through Thursday, with lows in the low 60s to low 70s. Rain chances will remain fairly minimal with isolated (15-30%) chances in the far southeast on Thursday through beyond the extended period. /AJ/ && .AVIATION... (18Z TAFS) Issued at 1228 PM CDT Fri Aug 16 2024 VFR conditions prevail with light winds out of the southwest around 3 to 5 kts. There exists some potential for storms in the vicinity of MEI, HBG and PIB this afternoon and evening, tapering off by late evening. Otherwise conditions are mostly quiet through the period./SAS/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 76 99 77 100 / 20 40 20 30 Meridian 75 99 73 99 / 20 50 20 40 Vicksburg 77 99 78 100 / 20 20 10 20 Hattiesburg 76 98 76 99 / 20 40 10 30 Natchez 76 97 77 99 / 20 20 10 10 Greenville 78 99 76 98 / 20 10 10 10 Greenwood 77 99 75 97 / 20 20 20 20 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...Excessive Heat Warning until 8 PM CDT Saturday for MSZ018-019- 025>029-032-034>037-040>044-047>050-053>057-059>066-072>074. Heat Advisory until 8 PM CDT Saturday for MSZ030-031-033-038-039- 045-046-051-052-058. LA...Excessive Heat Warning until 8 PM CDT Saturday for LAZ007>009- 015-016-023>026. AR...Excessive Heat Warning until 8 PM CDT Saturday for ARZ074-075. && $$ NF/AJ/SAS20