Day 1 Severe Weather Outlook

Valid 201200Z – 211200Z


The potential for thunderstorms across CONUS will be low today.

A substantial portion of the CONUS will be under the influence of a
strong arctic high pressure system moving southward from the
northern Plains into the Midwest by early Tuesday. A strong
mid-latitude low pressure system in the eastern Pacific will
approach the Pacific Northwest late in the period.

A cold front will be near the southern Florida coast at the
beginning of the period. Near and ahead of the boundary a few
thunderstorms will be possible during the day as the front slowly
moves southward. The likelihood of this activity affecting the
immediate south Florida Coast or the Florida Keys is low, however.

A Pacific cold front will reach the coastal regions of Oregon and
Washington early Tuesday morning. Cold temperatures aloft will
increase mid-level lapse rates such that isolated low-topped
thunderstorms are possible close to the shoreline. Coverage will
likely be less than 10%, though, as thermodynamic profiles will only
be marginally supportive of thunder so far east of the mid-level

..Wendt.. 01/20/2020


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