Area Forecast Discussion
Issued by NWS Jackson, MS
Issued by NWS Jackson, MS
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693 FXUS64 KJAN 100632 AAC AFDJAN Area Forecast Discussion...UPDATED National Weather Service Jackson MS 132 AM CDT Mon Jun 10 2024 ...New AVIATION... .MESOSCALE UPDATE... Issued at 1008 PM CDT Sun Jun 9 2024 The severe storm threat for the night has ended and the Severe Thunderstorm Watch that was in effect for our northern counties was allowed to expire. A weak cold front will continue to sag south through the northern half of the CWA the remainder of the night. This front may generate a few additional showers and thunderstorms. It was a hot day and there hasn`t been much convection to knock temperatures down. Temperature curves have been adjusted but morning lows still look achievable. /22/ && .DISCUSSION... Issued at 256 PM CDT Sun Jun 9 2024 Tonight and Monday: Showers and thunderstorm potential will continue into the evening as a frontal boundary pushes through the CWA areas north of I-20. With a moist airmass, favorable instability parameters, and deep-layer flow, the severe weather threat will be ongoing into the evening. Damaging winds near 60-70 mph and hail up to quarter-size will be possible. No changes were made to the HWO graphic. Overnight lows are expected to be in the upper 60s to lower 70s. Lingering showers will be possible along and ahead of the frontal boundary moving through the rest of the CWA on Monday, resulting in showers and thunderstorms near central and southern portions of the CWA but these storms are expected to be below severe limits. A sfc ridge will filter into the region post frontal passage, bringing dryer air and cooling afternoon temperatures down to the mid/upper 80s (elsewhere) and lower 90s (near Pine Belt). /SW/ Through mid-week (Monday night-Wednesday): Synoptic/sfc pattern at the start will consist of deepening longwave trough over the eastern CONUS while mean shortwave ridging will be situated over the southern Plains. At the sfc, a frontal zone will be diving down through the region, helping shunt rain & storm chances southward along the Gulf Coast. With less oppressive thermo profiles (i.e. 850mb T 13-17 deg C & 925mb T in upper teens to near 20 deg C) building in the wake & mean northerly flow in the 850-700mb layer, expect more seasonable highs in the upper 80s to low 90s through midweek. Heat stress not be a concern, as mean 850-700mb RH`s fall to the 20-30% range Tuesday & <20% on Wednesday. This is due to anomalously dry PWs around or less an inch Tuesday to less than half inch on Wednesday. Under sfc high pressure, dry moisture profiles & light winds, seasonably cool lows in the low-mid 60s are possible both Monday & Tuesday nights. Rain chances will driven to the Gulf Coast in the wake of the boundary. Next features to monitor are disorganized/"hybrid" Gulf low in the southeast Gulf of Mexico & upper low diving southeast out of the Plains. Moist return flow has backed off, with more drying/subsidence persisting through the midweek, keeping the area dry through mid-week. Late week-next weekend (Thursday-Saturday): There has been continued global consensus & ensembles of gradual, but slower development of a "hybrid" low pressure across the Gulf of Mexico, more focused into late next weekend. At the very least, this looks to bring a deep slug of tropical moisture northward (i.e. 340-350K 850mb Theta E & >2-2.5 inch PWs) across the eastern half of the Gulf of Mexico. In addition, there will be increased low-level convergence ahead of a diving upper low across the Gulf coast states late week. At a minimum, rain & storm coverage will be on the uptick late week into next weekend, with isolated-scattered rain & storm chances southeast of the Natchez Trace corridor. Details remain unclear at this point in development & there remains no areas of concern highlighted by the National Hurricane Center at this point. Any concerns for impacts from this potential "hybrid" Gulf low pressure have slowed well into the weekend & following week. Temperatures will be moderating back more seasonable in upper 80s-low 90s to seasonably warm & humid in the mid-upper 90s late week into next weekend, with lows near seasonable in the mid-upper 60s Thursday morning to seasonably warm in the low-mid 70s into next weekend. Heat stress could again become a concern, as heat indices could peak >100F next weekend. /DC/ && .AVIATION... (06Z TAFS) Issued at 129 AM CDT Mon Jun 10 2024 VFR conditions are expected to prevail at the TAF sites through the period, however some variable conditions near isolated SHRA or TSRA during the period cannot be ruled out. Confidence on impacts from thunder was too low to mention in the TAFs, though chances should generally move from northern Mississippi early in the period to southern Mississippi after 18Z. /NF/ && .PRELIMINARY POINT TEMPS/POPS... Jackson 64 87 64 89 / 0 10 0 0 Meridian 62 88 62 91 / 0 0 0 0 Vicksburg 65 87 65 89 / 0 10 0 0 Hattiesburg 67 91 67 92 / 20 10 0 10 Natchez 67 88 67 88 / 10 10 0 0 Greenville 64 86 64 88 / 0 0 0 0 Greenwood 62 86 62 89 / 0 0 0 0 && .JAN WATCHES/WARNINGS/ADVISORIES... MS...None. LA...None. AR...None. && $$ 22/DC/NF