Daniel Swain
Exceptionally warm-to-hot late winter conditions expected across the Southwest through the weekend, peaking Fri and Sat. Numerous daily record highs (and record warm overnight minimums) will be set, along with some Feb monthly records possible. [Thread] #CAwx #AZwx #NVwx
Feb 27 at 7:26pmWeb
Show threadDaniel SwainFeb 27
In addition, a weak cut-off low will entrain copious subtropical moisture (remnants from last week's atmospheric river) over NE Pacific & drag it inland across NorCal Sat and Sun. This will bring an extremely warm/muggy winter airmass--and along with it some thunderstorms! #CAwx
Show threadDaniel SwainFeb 27
In fact, this may be one of the most conspicuously humid airmasses in recent memory across the Sacramento & San Joaquin Valley--with air temperatures in the 70s and dewpoints into the mid 60s! 70s are not record-breaking, but mid-60s dewpoints are remarkable for Feb. #CAwx
Show threadDaniel SwainFeb 27
Scattered showers & thunderstorms will likely occur in this remarkably warm/humid/conditionally unstable airmass this wknd across NorCal. Best odds in Sierra, northern foothills, and northern Sac Valley. But isolated showers/t-storms possible as far south as SF/Sac as well! #CAwx