Mid-September HEAT


The northwesterly flow shown above (blue arrows) may guide batches of thunderstorms across northern or even central Oklahoma early/mid week. These would form as a result of weak mid-level troughs moving by, and upslope surface flow onto the higher terrain of western Kansas and Colorado. The ridge will probably be too strong for them to get this far south.
The pattern aloft will be similar to what we suffered under much of the summer: a large subtropical high parked overhead. This provides a sinking motion for the heat, while Gulf surface flow will keep the low-level moisture in place.
So it looks like hot and humid weather will prevail until the 16th or 17th, when a cold front brings some prospect of cooler and less humid weather.
Now though, it’s mid-September. We have very high soil moisture content and lots of green vegetation. These factors mean we’re talking low to possibly mid 90s, and not 100+.
I seriously doubt we’ll see 100 again this year in Texoma, but it will feel like it over the next few days given the high daily Heat Index values expected.
By the way, the Autumnal Equinox, the astronomical start of fall, is coming quickly: It will take place  10:09p.m. CDT (Texoma time) on Wednesday 22 September.
Take Care,
Steve LaNore
Chief Meteorologist
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  • by Jim Location: Durant on Sep 15, 2010 at 02:04 AM
    My persimmon tree seeds show a spoon for this upcomming winter. Gonna be cold!!
  • by Steve LaNore Location: KXII-TV on Sep 14, 2010 at 06:54 PM
    Ron is right about the snow. The annual average snowfall for Texoma ranges from about 5" for Ada to 3" at Ardmore and 2" at Sherman...last year was one of the snowiest on record. Take Care, Steve
  • by ron Location: Howe on Sep 13, 2010 at 04:56 PM
    I have been in Texas since Oct. 1974. And it seems that Sept is running pretty normal. Still kind of warm but usually an end to 100 F. And usually, more rain, though August was fairly rainy, too. We really start to cool off in October. And, it seems, most winters in Texas, we don't get more than a dusting of snow. Last year's winter was incredible, as far as I can remember.
  • by Dave Location: Bonham on Sep 13, 2010 at 03:46 PM
    When do you see a pattern change coming? I am looking forward to fall.
  • by Steve LaNore Location: KXII-TV on Sep 13, 2010 at 01:27 PM
    Bill, LaNina usually features dry and mild weather for Texoma, so if this comes to pass we should have lower humidity than during an El Nino winter. Of course these are just general trends and do not speak at all to day-to-day weather, as Hermine showed us last week. Take Care, Steve
  • by Bill Location: Healdton on Sep 11, 2010 at 08:05 PM
    I La Nina is building. Could this be why this weather is so hot and long lasting? I hear also that above temps and moisture this winter is quite possible. Is this possible Steve? Thanks for the great job you all do for us here in Texoma. Bill
  • by Joe Location: Gainesville on Sep 11, 2010 at 09:13 AM
    Steve, how is the fall looking as far as temps and precipitation?
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