The third week of September will be notable for its lack of extremes. Generally warmer than average over the west coast, TX and FL; near normal everywhere else except a pocket of slightly cooler than average temperatures in the south-central states centered around Arkansas and Kentucky.

This week brings a strong cool trough of low pressure moving off the eastern seaboard early in the week; it will force Atlantic tropical Storm Leslie north and across Newfoundland on Tuesday. In the wake of the tough, cool strong high pressure will build over most of the east bringing cooler, more typical fall conditions; quite pleasant. Temperatures will gradually warm through the latter half of the week. Much of the south will remain seasonably warm through the week; a good stream of monsoonal moisture will result in daily thundershowers over the desert SW. The Pac NW and Northwestern tier of states will cool off this week as a series of weak fronts drop south out of western Canada. The southern and central plains will be near to a little warmer than average to start the week but will cool off later in the week as some cool air seeps south, setting off a few thunderstorms along a frontal boundary.

NG injections to be reported this Thursday should again be under the 5 year average, due to some residual effects from Isaac, and quite warm conditions in most major markets last week.