What a difference a day makes.
A dry and welcome transfusion of clean Canadian air is giving air conditioners a rest in the Upper Midwest today. Dew points have dropped from the tropical 70s into the comfortable 50s over the past 48 hours.
The drier air will last through Friday, before a warm front gurgles back north and brings a renewed surge of 90 degree heat and sticky humidity this weekend.
As the front bubbles north Saturday, it's likely a few thunderstorms will follow. One or two has the potential be severe later Saturday night into Sunday, according to SPC.
Aurora strikes again:
Reports indicate the northern lights flashed again last night in northern Europe. Apparently the sky was lit brightly enough to show the aurora over the city lights of Stockholm, Sweden. Amazing images were also captured over Norway.
Check out spaceweather.com to see the latest images.
Colin part 2?
The remnants of what once was tropical storm Colin show signs orf renewal in the Atlantic. NHC says there is a 50% chance that the system may reach tropical storm strength once again.
The suite of forecast models steer Colin harmlessly out to sea away from the east coast.
Soak up all the heat and humidity summer has left folks. La Nina is back.
La Nina is the cool phase of what's known as the El Nino Southern Oscillation (ENSO). Water temperatures in the tropical Pacific Ocean fluctuate every 3 to 5 years between the warm El Nino phase and cool La Nina episodes. The latest readings show sea surface temperatures around -1.0 degree Celsius in much of the tropical Pacific.
La Nina has widespread impacts around different parts of the globe. It can enhance hurricane activity in the Atlantic. Though the 2010 Atlantic Hurricane season has been relatively quiet so far, The National Hurricane Center today updated its seasonal forecast to continue the prediction of an active season.
For Minnesota and much of the USA, the effects of La Nina are most pronounced in winter. La Nina winters have a statistical bias toward being colder than average in the Upper Midwest. Winters can also trend snowier in Minnesota, especially when compared to El Nino winters like last year. The Twin Cities received 40.7" of snowfall last year. The 30 year average is 55.9".
Have you noticed how loud the crickets are these nights? It seems as if a cricket boom has hit the weather lab. The deafening roar can be beautiful to some, and annoying to others.
Female (left) an Male (right) crickets image by Jim Mason. Courtesy Great Plains Nature Center web site.
Count the number of "chirps" in 15 seconds and add 37. That should give you a close approximation of the current temperature in degrees Fahrenheit. This is a fun exercise for kids of all ages on a warm summer night.
My favorite local phenologist Jim Gilbert used to say that cicadas would only sing (sounds more like screaming to me!) when the air temperature reached about 80 degrees. I guess they like the warmth to get those "cicada pipes" in action.
One more shot at northern lights?
There may be one last shot of solar wind headed for the earth tonight according to spaceweather.com. Keep an eye out if you are out late tonight for possible auroras in the northern sky. Best viewing is away from lights looking north.