April 25, 2018

Temperature: 42°F
Dew Point: 28°F
Wind: NNE 7 mph
Clouds: Clear

The high pressure system over the Midwest is keeping the skies clear today with barely any clouds and temperatures in the 60s. The high for today is 60°F and the low for tonight is 37°F. Definitely weather to leave your windows open at night for a great sleep.

Figure 1. Surface Forecast (intellicast.com).

The Nor'easter (Maritime Polar air mass) is bringing a lot of rain into the Northeast today. The east coast also has sharp changes in moisture where the occluded front stands (this is indicated by the dry lines). Additionally, the south has a lot of precipitation forming from the Maritime Tropical (Gulf) air masses. This air mass is most likely causing humid conditions as well.

Figure 2. Jet stream at 250 hPa (earth.nullschool.net).

The continually shifting jet stream has moved us from large quantities of snow to above average temperatures for this area. The approaching 70 temperatures is unusually for April and will be high by the time it's May. If the trough continues to build in the jet stream to the east, the continental polar masses will bring cold air to the west and the Maritime Tropical will shift warm and humid conditions for the east half of the US. This will bring severe weather to those areas that are on the border of the Cold/Warm front. That means that severe weather could also strike in the upper Midwest as well.

Figure 3. Severe weather outbreak, tornado risk poised to strike central US next week (accuweather.com).