Two weather systems will play a role in the week's weather. For the next 24 hours or so, however, pleasant fall high pressure dominates and will make for a nice night for trick-or-treaters. Clear skies and light wind will allow temperatures to fall into the 60s this evening, so it won't be very cold for the candy-hoarding ghouls and goblins! Monday will see an increase in high clouds, but still pleasant temperatures with highs in the 70s.
The first weather system to affect the area will be low pressure, mainly at the mid levels, dropping out of east TX into the north-central Gulf of Mexico on Tuesday. It will be close enough for showers to form over the lower Mississippi River Valley and affect the Mid-South late Monday night into Election Day. Most of the rain will remain over north Mississippi, but showers are also expected in the metro area. Voters will want to take their umbrellas to the polls. There won't be enough rain to significantly aid the drought conditions, but any amount will certainly be welcome! This system will move out Tuesday night with an "in-between" day Wednesday as high pressure briefly builds in.
The second major system will be a very deep (strong) upper-level trough that drops south over the Mississippi River Valley Thursday and moves slowly east Friday. This trough will bring much cooler temperatures for the end of the week and early in the weekend before it moves out. Very little, if any, rain is expected with this system.