Storm Prediction Center Forecast


RSS Mesoscale Discussions from Storm Prediction Center

SPC - No watches are valid as of Tue Dec 11 22:34:02 UTC 2018

No watches are valid as of Tue Dec 11 22:34:02 UTC 2018.


SPC - No MDs are in effect as of Tue Dec 11 22:34:02 UTC 2018

No Mesoscale Discussions are in effect as of Tue Dec 11 22:34:02 UTC 2018.


SPC Dec 11, 2018 2000 UTC Day 1 Convective Outlook

SPC 2000Z Day 1 Outlook
      
Day 1 Outlook Image
Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
0130 PM CST Tue Dec 11 2018

Valid 112000Z - 121200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Isolated thunderstorms remain possible late this evening through
tonight along the Pacific Northwest coast.

...Pacific Northwest...

Previous forecast appears on track with only minor adjustments this
update.

..Dial.. 12/11/2018

.PREV DISCUSSION... /ISSUED 1008 AM CST Tue Dec 11 2018/

...Synopsis...
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.

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