8/19 – The Chief’s “Heat Advisory” Thursday Morning Forecast
Main focus in the short term will be on the potential for oppressive heat across the region. Today may actually be the coolest day of the next 3-4 days with highs climbing into the mid-90s across much of the area. Once we heat up the heat index values will climb and climb quickly with a good chunk of the area likely seeing heat index values over 100 degrees. Scattered showers/t-storms will aid in some relief to the lucky few.
As for Friday and into the weekend, HOT, yes it will be hot. The mid-level high-pressure will continue to build west and by Friday will be centered over LA and east TX. The ridge will then be centered over the Lower MS Valley through at least Sunday. Moisture will still be quite abundant and there is still a fetch that is on the periphery of the high-pressure and around the base of a developing trough which will be a key in steering Henri this weekend and into next week. High-pressure will dominate through the weekend and into early next week.
A minor disturbance will swing through the northern Rockies on Sunday riding over the ridge on Monday and eventually moving into the Great Lake states by Monday. This will bring a cold front down through the Tennessee valley mid to late week eventually merging with the old boundary stalling over the forecast zones through the end of the week. Tropical waves will ride along from the southeast bringing a return to gulf moisture as the energy merges up with the stalled boundary.