An ice storm warning is in place for Washington and Benton counties, according to the National Weather Service.
Earlier, a Freezing Rain Advisory was issued for Benton County as temperatures tonight will be a few degrees on either side of freezing across the county. It appears that NW Benton County will have the best chance to fall to 30º while the east and southeast side of the county will remain near 32º. Bridges and overpasses are expected to be slick in spots Friday night and Saturday morning.
This map shows locations of potential road icing problems. Probabilities of icing are low but it doesn’t take much to create problems on elevated surfaces.
The image on this post depictes the most favored location for ice accumulations of up to .10″ there could be minor accumulations on elevated surfaces as far south as Fayetteville but generally .10″ is the threshold for road problems and .25″ is the threshold for power outages. It does not appear widespread power outages will occur at this time. There will be power outages in Oklahoma along and around a line from Tulsa to OKC where upwards of 1/2″ of ice will accumulate.
The map above is from the National Weather Service Office in Tulsa and shows total storm ice accumulation of .50″ in Western Benton County. This is a low-confidence forecast where 1 or 2 degrees will make the difference between a cold rain and a full blown ice storm.
The freezing rain will result because of the shallow cold air at the surface and slightly warmer air aloft.
Road conditions will improve early in the day Saturday as any freezing rain changes back to all rain after sunrise.
The map above shows the location of .25″ of ice and likely power outages. Red circles indicate a high liklihood of power outages. This does include the OKC Metro.
This map shows locations where trace amount of ice are possible. Note there is a high probability of at least trace amounts of icing in Washington County.