- Day Three
acus03 kwns 090638
Storm Prediction Center ac 090637
Day 3 convective outlook
National Weather Service Storm Prediction Center Norman OK
1237 am CST sun Dec 09 2018
Valid 111200z - 121200z
..no severe thunderstorm areas forecast...
the risk for severe thunderstorms appears negligible across the U.S.
Tuesday through Tuesday night.
Models indicate that a strong, largely zonal mid/upper jet,
extending across much of the mid-latitude Pacific at the beginning
of the period, may undergo increasing amplification Tuesday through
Tuesday night. As this occurs, one significant short wave impulse
emerging from it is forecast to gradually dig inland of the British
Columbia/Pacific northwest coast.
Preceded by low-level warming and an influx of moisture ahead of an
associated cold front early Tuesday, strong mid-level cooling
Tuesday night (including 500 mb temps to around or below -30c)
probably will be accompanied by sufficient destabilization to
support a few thunderstorms near Washington and Oregon coastal
areas. Aided by modest Post-frontal onshore flow, some of this
activity could develop into the western slopes of the Cascades, but
the risk for severe weather appears negligible.
Elsewhere, generally dry and/or stable conditions are expected to
persist across the remainder of the U.S., With negligible risk for