Warm Again on the Fall Equinox

September 22nd:  At risk of starting to sound like a broken record, it was warm and humid again today.  The high Friday at the Lawrence Airport was 91 and the low was 74.  The average dew point for the day (up to 9:00 PM) was 71 – still quite humid for this time of year.  The warmest temperature report in Kansas today was Hill City, in northwest Kansas, where it reached 100.  However the dew point out there was in the mid 50s – far drier than the 70 degree plus dew points in the local area.  Hayes came in with 99.

Today marked the fall equinox.  However, summer-like weather is slated to continue through at least Sunday.  For a good description of what, exactly, the fall equinox is, check out this link from Weather Underground:

https://www.wunderground.com/news/fall-autumnal-september-equinox-2017

g13.2017265.2045_US_vis

 The cold upper trough is still digging southward and now bringing cool conditions and showery weather to much of the intermountain west, but no widespread or organized precipitation.  A ridge of high pressure aloft downstream is bringing warm conditions to most of the eastern half of the country.   Jose, now a ‘post tropical cyclone,’ continues quasi-stationary southeast of Cape Cod.  Its winds and precipitation are now rapidly decreasing, but it still has an impressive pinwheel cloud signature on satellite imagery.  A still very impressive Category 3 Hurricane Maria is moving slowly to the north-northwest.   

For a little meteorological humor, here is today’s final statement on Jose from the National Hurricane Center in Miami:

NWS National Hurricane Center Miami FL       AL122017
500 PM AST Fri Sep 22 2017

After 70 advisories, enough is enough.  The tropical-storm-force
winds from Jose have finally subsided and moved out of the
southern New England.  Thus, the wind hazard to land has decreased,
and this will be the last advisory on Jose since it is already
post-tropical. A slow decay over cold water is forecast while the
low drifts southeastward to southward.  The cyclone should
degenerate into a trough within 3 days as forecast by the global
models.

The swell and rip current threat will remain across large portions
of the U.S. east coast for quite some time, due to the wave field
from both Jose and Maria.
upaCNTR_250

The strong upper trough of low pressure out west is morphing into a closed, cut-off low, as it continues to sink slowly southward.   This continues to pump up a warm ridge of high pressure aloft over our region.   East of the ridge over our area, a bit of a closed low circulation is developing over the southeastern US as well.  

 

IMG_0482

This morning’s sunrise from near Iowa and Ninth Streets in Lawrence featured a thin layer of mid-level alto-cumulous clouds.  These cleared by mid morning and the rest of the day was almost cloud free. 

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