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Area Forecast Discussion
Issued by NWS Jackson, MS
Issued by NWS Jackson, MS
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684 FXUS64 KJAN 050925 AFDJAN Area Forecast Discussion National Weather Service Jackson MS 425 AM CDT Fri Jul 5 2024 ...New DISCUSSION... .DISCUSSION... Issued at 425 AM CDT Fri Jul 5 2024 Today through tonight: Not much has changed concerning our forecast thinking with considerable heat stress and convective rainfall expected today. With temperatures struggling to fall below 80 early this morning over portions of the forecast area, it will not take much heating to reach heat advisory criteria, and it appears the greater convective emphasis will be later this afternoon as previous guidance may have been a little too aggressive with convective outflow, so have gone ahead and issued a heat advisory for the entire area. In terms of today`s storm potential, the scenario remains the same with a cold front forecast to push southeast into northwest portions of the forecast area by this afternoon. The air over our region is tropical-like with precipitable water values well over two inches and H850 dewpoint temperatures around 18 deg C. Pool lapse rates will limit the convective intensity, and so locally heavy rainfall may be the primary concern given the anomalous moisture parameters. Expect mostly disorganized shower/storm coverage to peak during the mid/late afternoon hours, but there should be enough mid level flow to support a few multicell storm clusters. Expect convective rainfall to diminish this evening with rain chances diminishing this evening behind the cold front. /EC/ Tomorrow night through midweek: For anyone unaware of what the past stretch of heat has been like, there may be some consternation in calling the weekend airmass "post frontal" as it will certainly not be "cool", never mind "cold". Nevertheless, a drier, "less-hot" airmass will reside across the area resulting in a reduction in the degree of oppressive heat. Three cheers for returning to "normal hot summer"! No? Fair enough. It WILL be slightly better, though as highs Saturday and Sunday bump up "only" into the low to mid 90s F and heat indices "only" in the 100-105 F range, about 10 degrees cooler in the apparent temperature category. Perhaps more noticeable will be the overnight lows which will be 5-8 F cooler in the 72-75 F range. While widespread heat products will be less likely, there is still a possibility that we will need a lower-end outlook for heat stress particularly along and south of the highway 84 corridor. Given the marginal conditions (max apparent temps 104-105), will wait until the frontal airmass is sampled/modeled better later today as it is possible that convective reinforcement could push the boundary just south of our area allowing those areas to remain just under heat criteria over the weekend. The lowered upper heights and glancing influence of the upper trough responsible for the frontal intrusion will linger into midweek and temperatures along with afternoon, mostly diurnal, showers and storms will continue into midweek. Highs will remain lower 90s F, lows low-mid 70s F. One fly in the ointment by the middle of next week will be what exactly happens with the weak disturbance associated with the remnants of Hurricane Beryl. With the weak upper trough around, this could allow for the pocket of cloudiness and somewhat higher PWAT environment to advect across our area. This would serve to increase scattered shower/storm activity and give us another day or two of seasonable temperatures. On the other hand, should the cyclone fully dissipate or become tucked underneath a strengthening ridge aloft across the Southwest and into Texas, our upper heights could rise more expediently. In short, the mid week forecast is a bit more challenging with at least two most likely possibilities: Showers/storms and only "normal" July hot, or fewer showers/storms and a return to excessive heat conditions. We will be monitoring this closely. As of now, neither of these two solutions appear to be particularly impressive in terms of hazard-production outside of the heat risk. If we do see some additional aid in terms of deep layer tropical moisture, locally heavy rains appear possible. For that reason we can`t fully rule out an isolated flash flooding risk for mid week. /86/ && .AVIATION... (06Z TAFS) Issued at 204 AM CDT Fri Jul 5 2024 Will be monitoring for IFR/LIFR category stratus development and a few areas of IFR category br/fg in mainly southeast portions of the area through early morning. Thereafter, attention will turn to convective rainfall potential through much of Friday with emphasis on the aftn, and have included a mention of shra/ts in TAFs given considerable coverage expected with the approaching front. /EC/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 92 74 90 73 / 70 70 50 10 Meridian 94 74 92 71 / 70 60 60 20 Vicksburg 93 74 91 72 / 70 60 40 10 Hattiesburg 93 76 93 76 / 70 50 80 20 Natchez 92 73 89 73 / 70 60 60 10 Greenville 93 72 91 71 / 60 20 10 0 Greenwood 93 72 92 71 / 70 30 10 0 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...Heat Advisory from 9 AM this morning to 7 PM CDT this evening for MSZ018-019-025>066-072>074. LA...Heat Advisory from 9 AM this morning to 7 PM CDT this evening for LAZ007>009-015-016-023>026. AR...Heat Advisory from 9 AM this morning to 7 PM CDT this evening for ARZ074-075. && $$ EC/LP/EC