The Solar Eclipse and the Temperature
Now that the great U.S. Solar Eclipse has passed through, it was interesting to see the temperature change during the event. Under fully clear skies, the eclipse began around 9:05 A.M. in Happy Valley, Oregon. The temperature on my Davis Vantage Pro2 (VP2) station stopped its typical morning rise and began leveling off at around 9:15 A.M., peaked at 66.5°F just before 10:00 A.M., then began dropping. Happy Valley saw 99.6% of totality, occurring around 10:18 A.M., and the temperature continued dropping until about 10:45 A.M., reaching down to 63.9°F. Once more full sunlight began returning, so did the temperature. Included is my temperature timeline below (red line, green line is Dew Point) from my VP2 data as shown on The Weather Underground website, which I had to access remotely as I was actually in Salem to experience totality (it was amazing to witness!). I've also included a few pictures of the... read more ❯
Final Eclipse Update
There's only 17 hours to go until the eclipse, and we are now within the range of the latest HRRRX (Experimental High-Resolution Rapid Refresh) model! This is exciting because the HRRRX takes the decrease in solar radiation due to the eclipse into account. Take a look at the predicted incoming solar radiation tomorrow and see if you can track the path of the eclipse. It's not too difficult. 🙂 The HRRRX also shows cloud "ceilings", which is the height of the lowest level of clouds that covers at least half of the sky. In Oregon, skies look clear for everywhere except the coast. Thankfully, you won't have to go far inland to get away from the marine layer. There are a few high clouds over Washington, but these... read more ❯
Your Eclipse Forecast!
Can you believe that there are less than 48 hours to go until the Great American Eclipse of 2017? I get giddy just thinking about it. The weather is looking spectacular for nearly everyone - the coast will likely be shrouded in low clouds for the viewing, and there's still some uncertainty about a weak marine layer sticking around in the Portland metro area/Puget Sound during eclipse time. A substantial ridge of high pressure currently sitting off the West Coast will move inland over the next few days, and by eclipse time, it will be directly positioned over the Pacific Northwest. The path of totality across Oregon, with... read more ❯
Near Total Eclipse Blog: Details And Weather
It's time for the big ECLIPSE BLOG. A few days ago I thought I had a ride up to a camping site near John Day, for the total eclipse. But those plans fell through. As of right now, my plan is to just enjoy the 99% eclipse from here in town. But what will a 99% eclipse be like? Obviously you can't see the corona, and also can't safely look directly at the sun without your protective ISO glasses. The sky will not turn black either. Your shadow will still be visible. HOWEVER...it will become pretty obvious, to humans and animals alike, that something isn't "normal" about the sun as it gets close to peak coverage. Cutting out 99% of the incoming solar energy may not darken the sky fully, but the hue will change. And you won't feel... read more ❯
Dry Streaks End Tonight!
FINALLY! After 56 days of no measurable precipitation for Seattle and 57 for Portland, both streaks will end tonight as a relatively strong front moves through the area. The front is associated with an upper-level trough/associated ~995 hPa surface low currently centered near Haida Gwaii. The water vapor imagery below looks more reminiscent of a wintertime system than something we'd see in August. The front is visible in even greater detail with our brand new GOES-16 satellite, which is still "experimental" and not yet operational at this point. When it becomes operational, it will be moved east to replace the old GOES-East satellite. We will have to wait until the launch of GOES-S in 2018,... read more ❯