Area Forecast Discussion
Issued by NWS Las Vegas, NV

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000 FXUS65 KVEF 222115 AFDVEF Area Forecast Discussion National Weather Service Las Vegas NV 215 PM PDT Tue Aug 22 2017 .SYNOPSIS...
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Isolated thunderstorms will return to much of the region Wednesday, then moisture decreases and thunderstorm chances end on Thursday. High pressure regains control Friday, with dry and hot weather expected through the weekend.
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&& .DISCUSSION...
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Cumulus clouds over much of the region have produced even less lightning than was expected today, especially over the Sierra where zero flashes and strikes had been observed through 2 PM. Reduced PoPs somewhat for the evening there, but spread them a bit farther south into northern Mohave County where a few strikes had occurred. Weakening low pressure still expected to move onshore tomorrow, kicking off a few more storms than today. Any precip chances Thursday should be limited to Mohave County as the low weakens and fills. From Friday onward, high pressure building in will send temperatures 5-10 degrees above late August normals. Heat Risk grids are showing an outside chance of needing advisories and/or warnings for the weekend or early next week, while there is also an outside chance of a record high or two being threatened. The 109F record highs at KLAS on the 26th and 27th are the only two record highs under 110F in the month of August.
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&& .AVIATION...
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For McCarran...A light and variable wind, under 8 knots, will remain through the rest of the afternoon, likely favoring east southeast direction. Anticipating a shift to a south wind early this evening between 00z-03z wind and then a drainage wind overnight. Diurnal winds will set up again Wednesday, however there will be better chances for thunderstorms in the Mountains and northwest Arizona, which may direct an outflow boundary toward the terminal. Few to scattered skies expected with cloud bases between 10-12kft. For the rest of southern Nevada, northwest Arizona and southeast California...Typical diurnal winds expected across the region this evening with mostly clear skies. Wednesday afternoon a southerly wind will setup and remain through the evening with speeds around 5- 15 knots. Shower and thunderstorm activity will increase Wednesday afternoon. This activity will be focused over the south Sierra, northwest Arizona, and Clark County mountains.
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&& .SPOTTER INFORMATION STATEMENT...Thunderstorm chances will continue through Wednesday across portions of the area. Spotters are encouraged to report any significant weather or impacts according to standard operating procedures. && $$ Discussion...Morgan Aviation...Boothe For more forecast information...see us on our webpage: http://weather.gov/lasvegas or follow us on Facebook and Twitter

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