Three 70 degree days!

May 18, 2011

We haven’t seen that so far this year.  In fact today through Friday we’re doubling our seasonal total of 70 degree days to 6, but it’ll still be well below any other Spring lately.  Notice we’ve passed up (or fallen below) the cold spring of 2008.  That year we had an early hot spell in mid-May.

Most important, the brief warm spell, and reasonable temperatures next week, mean that we’ve broken out of the extremely chilly weather.  But that 7 Day forecast just looks “normal” for May with some above average temps and some below average.  There’s no long spell of warm weather in sight.  Long range models aren’t doing very well beyond the middle of next week either.

For tomorrow and Friday?  Two perfect May days with sunny skies all day tomorrow along with a warmer upper-level airmass means a few notches of warming.  High clouds arrive Friday afternoon, but my forecast assumes any thick cloud cover holds off until after peak heating time.  We do get very weak offshore flow Friday morning, but then it’s back to onshore flow by Friday night.  That’ll give us cooler temps Saturday.  But with no big surge of low clouds (probably) Saturday, we might just see partly cloudy skies that day.

Chief Meteorologist Mark Nelsen

Thunderstorms Developing Over Cascades

May 18, 2011

As expected this afternoon, the strong May sunshine and rising motions over the mountains are producing afternoon showers, and a few thunderstorms too.  They are moving from north to south, so it’s unlikely we’ll see any here over the lowlands close to I-5.  But if you live near or in the foothills, you might hear a rumble or get a shower the next few hours.  And you can see there is a storm at 2:30pm just north of Hood River, plus several getting organized over and just south/southeast of Mt. Hood.