We’re all set for a historic day temperature-wise in the region.
A record warm airmass is overhead. When the morning weather balloon went up over Salem this morning (it’s done twice a day), at the 850mb level (about 5,000′), the temp was 68 degF. It’s never been that warm until the first week of May as you can see by the dot on the chart. The squiggly red line shows each day’s warmest temperature ever recorded at that height.
East wind is very strong, with 7 millibars easterly gradient between The Dalles and Portland this morning. Actually a bit stronger than I would like to see. If it were to gust 20-30 mph at PDX all afternoon that could hold the temperature down lower than the 86 I forecast last night. We’ll see. Regardless, it’s spreading across the metro area as the warm air above begins to surface and the overnight cool air ponded in the valleys warms. That means a dramatic jump in temperatures between now and 11am.
Corbett, in the wind all night, stayed in the 60s; this in a place that has an average HIGH this time of year in the mid-upper 50s. Tropical by April standards. Eagle Creek RAWS between Sandy and Barton suddenly jumped to 74 at 9am! Several 70 degree temps at 9am in Damascus area too already as warming surfaces…crazy for April! Sunset Transit Center at 217/26 has jumped to 69 as well in that exposed east wind spot.
There are a few locations in the Cascades and/or foothills that have already at 9am reached or exceeded yesterday’s highs…with 8 hours of heating to go! Ariel near Lake Merwin and Brush Creek (2400′) near Eugene are both 75 degrees.
So I think we’re all set for 80s this afternoon. Enjoy the record warm temperatures, at least the wind and dry air should keep it from feeling real “hot”.
Chief Meteorologist Mark Nelsen