02/21/18 Ice Storm: MO/IL/IN

  • Please note the forum rules were updated today. You may review them by clicking here
Jan 14, 2011
St. Louis
The NAM and Euro have been consistent for the last 36 hours on a narrow (50-70 miles) corridor of heavy icing from Springfield/Joplin Missouri through central Illinois late Tuesday night into Wednesday afternoon as a shallow Canadian airmass undercuts several rounds of heavy precipitation. The GFS has not shown ice storm-level QPF, showing a slower encroachment the cold air southeast.

NAM ice accretion output have been in excess of 1 inch in the swath from the KS/MO/AR border area through St. Louis into central IL by late Wednesday.

The main limitation I see with this event is the marginally subfreezing surface temperatures of 30-32F, with much of the forecasted icing shown less than 100 miles west of the freezing line. Just a slight uptick in temps or slowdown of the cold front could completely wipe out the icing potential.
  • Like
Reactions: Mike Marz