RSS Mesoscale Discussions from Storm Prediction Center
SPC 1630Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1108 AM CDT Tue Mar 17 2026
Valid 171630Z - 181200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not forecast through tonight across the contiguous
United States.
...Synopsis...
Water-vapor imagery late this morning shows a large-scale upper
trough over the East with a ridge over the West. Drier and stable
conditions have encompassed much of the CONUS in wake of a cold
front that continues to push eastward into the western Atlantic.
..Smith/Lyons.. 03/17/2026
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SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1136 AM CDT Tue Mar 17 2026
Valid 181200Z - 191200Z
...NO THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Thunderstorms are not expected on Wednesday.
...Synopsis...
An amplified upper pattern characterized by a trough in the East and
a ridge/upper high in the West will persist on Wednesday. Surface
high pressure across the East/Southeast will foster offshore flow
and a dry and stable airmass will prevail across most of the CONUS.
Modest boundary layer moisture will exist across far South FL and
the Keys, with a stalled front offshore across the FL Straits. A few
thunderstorms are possible near this boundary, but are expected to
mainly remain offshore.
..Leitman.. 03/17/2026
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