Category: Posts EN

An active upper level pattern will persist into the new week. Two areas will see a particular risk for severe storms on Monday into early Tuesday, one in the central Appalachians and Mid-Atlantic, the other in the Plains.

A cluster of storms will be ongoing Monday morning in the Midwest. As it moves across Ohio towards the central Appalachians by midday, it will encounter increasing instability thanks to daytime heating. Strong to severe storms will cross the mountains into the Mid-Atlantic later in the afternoon and early evening. Strong wind gusts to 65 mph and large hail to 1.5″ will accompany the stronger cells.

Storms will fire in the mid-afternoon hours over the Plains, especially from northwest Texas to northern Illinois. These storms will tend to move northeast with damaging wind gusts to 75 mph, hail to two inches in diameter, and perhaps an isolated tornado or two. These storms will tend to weaken slowly after midnight.

A strong upper low is moving across the Sea of Japan with tropical moisture streaming ahead of it. Showers and a few storms will produce torrential rainfall, especially over mountainous terrain like the Japanese Alps.

Rainfall rates exceeding 25 mm/hr will occur with the heaviest cells this afternoon and evening. Totals upwards of 75 mm will occur on south-facing slopes of the central mountains with 50-75 mm in cities like Kyoto and Nagoya. The Tokyo metro will see moderate to heavy rainfall with amounts 25-50 mm leading to localized flooding. The heaviest rainfall should gradually taper off overnight tonight into early Monday.

Strong to severe storms have raked across portions of the central Appalachians and Mid-Atlantic Saturday afternoon and evening. Reports of hail to the size of golf balls (1.75 inches) and wind gusts 60-65 mph have been received. Major cities like Pittsburgh, PA and Baltimore, MD were affected. The storms passed off the coast around midnight.