290 
FXUS63 KLSX 251738
AFDLSX

Area Forecast Discussion...Updated Aviation
National Weather Service Saint Louis MO
1238 PM CDT Thu Jul 25 2019

.SHORT TERM...  (Through Late This Afternoon)
Issued at 214 AM CDT Thu Jul 25 2019

A surface ridge axis will continue shifting eastward today, 
allowing winds to take on more of a southerly component across the
LSX CWA. The combination of light southerly winds and gradual air
mass modification will produce high temperatures which are a few 
degrees warmer than yesterday. The expected highs in the low/mid 
80s are still near or slightly below normal for this time of year 
across most of the area. 

Although isolated rain showers cannot be entirely ruled out today
along the northwestern periphery of the surface ridge, conditions
appear less favorable for SHRA today than they did yesterday. 
Given the extremely low coverage of SHRA noted yesterday, PoPs 
were kept below mentionable levels for today's forecast. 

Kanofsky

.LONG TERM...  (Tonight through Wednesday)
Issued at 214 AM CDT Thu Jul 25 2019

As the surface high pressure center continues shifting eastward,
the LSX CWA will be located on the back side of the departing
surface high and ahead of a weak cold front developing across the
central CONUS. The resulting southwesterly winds between these
features will continue to bring a warmer and more humid air mass 
back into the region. The combination of southwesterly winds at
the surface and modest height rises aloft will keep the gradual
warming trend going through the weekend, and highs should reach 
the upper 80s to lower 90s by Sunday. 

By early next week, a PV anomaly moving from the northern CONUS
towards the Great Lakes will push a weak cold front through the 
region. This will bring scattered SHRA/TSRA to the area from 
Sunday night through Tuesday morning. Clouds and precipitation 
will likely suppress high temperatures by a few degrees until the 
front has moved through.

Kanofsky
&&

.AVIATION...  (For the 18z TAFs through 18z Friday Afternoon)
Issued at 1237 PM CDT Thu Jul 25 2019

VFR flight conditions are expected through the entire forecast
period. There is still a chance of very isolated showers this
afternoon, but kept vicinity shower mention out of TAFs. 
Otherwise, light south to southwest winds expected. 

Byrd
&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...None.
IL...None.
&&

$$
WFO LSX