SPC AC 111608
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1008 AM CST Tue Dec 11 2018
Valid 111630Z - 121200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
Isolated thunderstorms will be possible late this evening through
tonight along the Pacific Northwest coast.
Relatively cool/dry air in the low levels will dominate the majority
of the CONUS, with no threat for thunderstorms. A southern stream
shortwave trough will move over northern Baja through tonight,
though any substantial low-midlevel moistening and related threat
for deep convection will remain south of the AZ border. A northern
stream shortwave trough over the southeast Gulf of AK will progress
inland over WA/northern OR this evening into tonight. Steep
low-midlevel lapse rates with the midlevel thermal trough, in the
post-frontal onshore flow regime, will support weak surface-based
buoyancy (SBCAPE generally 100-300 J/kg) and an attendant threat for
isolated, low-topped thunderstorms late this evening into tonight.
CLICK TO GET WUUS01 PTSDY1 PRODUCT
NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 2000Z