textproduct: Jackson

KEY MESSAGES

- There is potential for increasing heat stress late this week and weekend.

MESOSCALE UPDATE

Issued at 1035 AM CDT Tue Jun 9 2026

Drier air will continue to move in from the west this morning. This will help clear out any cloud cover over the area which will allow for mostly sunny skies areawide. Afternoon highs will peak in the low 90s. Although lower humidity is expected across our CWA this morning, the higher temperatures combined with the humidity will result in peak heat index values in the lower 100s across most of our CWA this later afternoon. Portions of northwest MS will see heat indices reach 105F. Because of this, a "Limited" threat for dangerous heat has been introduced for the Delta region for this afternoon. Updates are out. /CR/

DISCUSSION

Issued at 334 AM CDT Tue Jun 9 2026

Through tonight: Early morning radars still showed some very light returns along the Interstate 59 corridor. Latest satellite imagery showed drier air moving over the western portions of the CWA in the wake of a departing shortwave trough. The 00Z Tue JAN sounding had a PWAT greater than two inches. Latest satellite derived total PW product had 1.6in over the western half of our CWA. As the shortwave trough continues shifting east this morning, the drier air from the west will help clear out the cloud cover and end the very light precipitation over our southeast. With less cloud cover and greater insolation today temperatures will top out in the lower 90s which is warmer than normal. Although lower humidity is expected today, the higher temperatures will combine with the humidity to result in peak heat index values in the lower 100s over most of the CWA. Our northwest zones will see the highest peak heat index values this afternoon, near 105F. There will be less cloud cover around tonight but our warm moist airmass will continue to support warmer than normal morning lows in the low to mid 70s. /22/

Wednesday through Next Monday...

Pleasant sunny conditions will prevail across our CWA Wednesday and Thursday as the subtropical ridge remains over our forecast area. The clear skies and persistent daytime heating will cause afternoon highs to peak in the low 90s for both days. Heat indices will be on the rise Wednesday and Thursday with heat index values reaching the triple digits mainly for areas along and west of I-55. Areas east of I-55 will see heat index values in the upper 90s.

Dangerous heat will be the primary focus for the long term period particularly for the Friday-Sunday timeline given the relative cloud free conditions, increasing temperatures, and humid boundary layer conditions due to the recent above normal rainfall. Current afternoon guidance continues to show that heat indices/WBGT and the overall heat risk will peak Friday-Sunday when highs are expected to reach the low/mid 90s areawide, while boundary layer moisture begins to pool over the area. We will hold off on messaging for dangerous heat for now given that this is still several days out and will continue to monitor heat trends as we get closer to the weekend. Once the peak heat threats begin to show up within the day 4 forecast range, that should be a good time to act on and message for them in earnest.

Looking down the road, as we finish up the weekend and go into early next week, a significant trend was noted in the longer term global ensemble guidance for unseasonably strong westerlies to be suppressed southward into our region. This hints at an active convective pattern that would be rather anomalous for mid June, so would recommend monitoring this trend as we go through the next several days./CR/

AVIATION

(18Z TAFS) Issued at 1230 PM CDT Tue Jun 9 2026

VFR conditions expected to prevail at the TAF sites through the period. Winds will be generally less than 10 kts from the south during the period. /NF/

PRELIMINARY POINT TEMPS/POPS

Jackson 74 93 74 93 / 0 0 0 0 Meridian 73 94 73 94 / 0 0 0 0 Vicksburg 76 93 75 93 / 0 0 0 0 Hattiesburg 71 93 71 93 / 0 0 0 10 Natchez 74 94 74 94 / 0 0 0 10 Greenville 76 94 77 93 / 0 0 0 0 Greenwood 75 94 76 94 / 0 0 0 0

JAN WATCHES/WARNINGS/ADVISORIES

MS...None. LA...None. AR...None.