Unusually cool June air in northern U.S. (credit: Tropical Tidbits, NWS Buffalo)
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.
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© 2017 Meteorologist Jake Spivey
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