Late Evening Ice Update

January 4, 2016

11pm Monday…

Temperatures have dropped to right around freezing with some unanticipated clearing.  Here are the air temps:

PLOT_Temps_Metro.png

and the ODOT road surface temps have dropped to around freezing too:

MarkODOT_RoadTemps

Now a thin band of light showers is approaching from the south.  Sure seems like we could see spots of freezing rain even in the lower elevations of the metro area.   Possibly, but I’d be more worried about getting a few rain showers and then more clearing later tonight.

But as of now it appears to me cloud cover should thicken quite a bit later with increasing showers.  That would keep temps near/above freezing and avoid any widespread re-freezing of roads.  Hope I’m not wrong!

Obviously Tuesday morning is a time to check the temperatures and road conditions before you head outside!

Chief Meteorologist Mark Nelsen


Monday PM Freezing Rain Update

January 4, 2016

3:30pm Monday…

Welcome to the world’s slowest thaw!  Ice doesn’t melt quickly at 32-35 degrees.  Temperatures are a few degrees above freezing this afternoon in the metro area.  Freeways/highways are fine, and main roads WEST of I-205 seem to be wet as well in the lowlands.  Still tons of ice left on roads in the higher hills (West Hills) and closer to the Gorge where temps have been colder too.

PLOT_Temps_Metro

 

THIS EVENING

  • Showers develop again and it’ll be showery through tomorrow morning’s commute.  TEMPERATURES REMAIN AT OR ABOVE FREEZING.  THEY WILL DIP TO OR SLIGHTLY BELOW FREEZING IN TROUTDALE/GRESHAM/CAMAS WASHOUGAL AREAS (NEAR THE GORGE) AND UP AROUND 1,000′ IN THE WEST HILLS.
  • Roads will remain wet all for most of us and icy roads will continue to SLOWLY melt during the night.  There won’t be any sort of “refreezing” in the lower elevations overnight.
  • Near the Gorge and the top of the West Hills, roads will remain icy with those cooler temps.  There will be additional icing of trees/power lines east of I-205, but probably not enough to cause problems.

Keep in mind that to get “new ice” on roads tonight, temperatures generally need to be down to 30.  That’s why I’m not real excited about any refreezing.

TUESDAY:  A few showers, then mainly dry.  A few sunbreaks too…  Slightly warmer so thawing continues even near the Gorge.  High near 38.

IN THE GORGE:  Continued freezing rain showers through Wednesday…mainly icy roads will remain through Wednesday morning.

Chief Meteorologist Mark Nelsen