DISCUSSION: From the Dakotas to Virginia, residents are enjoying a breath of fresh air as low humidity makes its presence known throughout the region. Since the summer solstice has come and gone, many of these areas expect dew points to be in the 60s or 70s over the next few months, especially along the East coast. However, as shown in the above HRRR analysis from Tropical Tidbits, many of the dew points were only in the 40s this afternoon. Combine that with high temperatures staying in the 60s and 70s, and it turned out to be a fantastic June day.
The cause for this cool and dry air is a fairly strong trough moving through the Great Lakes. While not unheard of, troughs of this nature are pretty rare for late June. According to the National Weather Service in Buffalo, this feature is something we would normally see as Fall prepares to arrive. The trough is forecast to continue moving to the east over the next two days while slowly dissipating.
Although the phrase "refreshing air mass" may not sound like extreme weather, there were several record lows tied or broken this morning. In North Dakota, Fargo tied a record low of 40 while Bismarck set a new record low with the same temperature. In Minnesota, St. Cloud tied a record low of 42 while rural Embarrass dipped down to 33! As the air mass moderates towards the East coast, record lows may not be within reach for I-95 cities, but a comfortable Monday night and afternoon on Tuesday should still be expected.
To learn more about other high-impact weather events affecting North America, be sure to click here! © 2017 Meteorologist Jake Spivey
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 DISCUSSION: As forecasted, high pressure in the southwest United States has led to record-breaking heat. On June 20, 2017, Las Vegas, Nevada and Needles, California tied their all-time record high temperatures at 117°F and 125°F, respectively. Death Valley, California lived up to its name by reaching its new record high temperature for June 20th, hitting a scorching 127°F and surpassing its previous record of 126°F set back in 2016. This trend has become quite common among a myriad of locations across the southwest, as most of the region has soared well into triple digits the past week.
Excessive heat warnings were issued for parts of southwest Arizona, southern Nevada and most of inland California. Aside from shattering records, the extreme heat has promoted wildfires, canceled flights, caused roads to buckle, and knocked out power (excessive use of electricity and air conditioners can strain the power system). Want to know how to beat the heat? Click here! To learn more about other high-impact weather events affecting North America, be sure to click here! © 2017 Meteorologist Nicholas Quaglieri A few days ago, I noted that southwest Florida “rainfall for June 2017 (now almost only half over) was at rarified levels.” Since I’ve had a chance to compare observed rainfall to longer-term records (using the NOAA Regional Climate Center data base), it is clear that the deluge so far this month has started to submerge many existing records… To read the full story, click here - http://www.weatherworks.com/lifelong-learning-blog/?p=1327 © 2017 H. Michael Mogil To learn more about other high-impact weather events affecting North America, be sure to click here!  Rainfall for June (now almost only half over) is already at rarified levels. Many locations across southwest Florida have logged 15 to 20 inch values. And more rainfall is anticipated… To read the full story, click here - http://www.weatherworks.com/lifelong-learning-blog/?p=1313 © 2017 H. Michael Mogil To learn more about other high-impact weather events affecting North America, be sure to click here!    DISCUSSION: A trajectory is the path followed by an object moving under certain forces and can explain where something came from or where it is going. Modeled trajectories can be applied directly to particles of air in the atmosphere and answer the questions, why is it so cool today, or vice versa. Using the HYSPLIT model from NOAA, which shows a backwards trajectory of air molecules, can tell the story. This model, which uses the GFS ensembles, can be used to explain the atmospheric pattern showing where air molecules originate in Kansas, as in this example.
The type of air-mass over much of the eastern half of the United States is shown well in this backwards trajectory. The air-mass that ends up in Kansas originated in central Canada which can be chilly even for late May. As the air-mass progressed south and east from Canada, it interacted with the upper level counterclockwise circulation in the eastern half of the country and progressed from around southeastern Quebec to Manitoba and into the central United States. Because of this, the Great Plains experienced the brunt of the below normal temperatures on May 24th as shown in the image above from the Climate Prediction Center. To learn more about other interesting weather stories occurring across North America, be sure to click here! ©2017 Forecaster Joseph DeLizio  DISCUSSION: When you think about June weather in the U.S., you probably have ideas of warm, sunny days - perfect for outdoor activities. However, the higher elevations in the northwest part of the U.S. may have to contend with snow this upcoming weekend into early next week. Higher elevations are almost always colder than lower elevations because temperature generally decreases with height in the lower part of the atmosphere. But, this weekend a trough, or dip, in the jet stream is expected to bring especially cool temperatures to this part of the country. More than 6 inches of snow may fall in portions of central Oregon, northern California, NW Nevada, central Idaho, SW Montana, and NW Wyoming. Most of this snow should remain above the 5,000-ft elevation, but may reach the lower portions of valleys in Wyoming. Given the more intense June sun (due to a more direct overhead angle), snow shouldn't accumulate on roadways. The biggest impacts will likely be to campers and others who plan to participate in outdoor activities. The much cooler temperatures may come as a bit of a shock for those not expecting it this time of year.
To learn more about other interesting weather stories occurring across North America, be sure to click here! ©2017 Meteorologist Dr. Ken Leppert II At around 7:30 p.m. E.D.T. this Friday evening, my wife and I spied a well-formed funnel cloud west of our location in North Naples, FL. The funnel was likely near or just offshore from Vanderbilt Beach. Radar images showed a developing shower or thunderstorm near the funnel’s location… To read the full story, click here - http://www.weatherworks.com/lifelong-learning-blog/?p=1299 © 2017 H. Michael Mogil To learn more about other high-impact weather events affecting North America, be sure to click here!  |
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