Dangerous Heat in the Central and Eastern U.S.; Severe Thunderstorms in the Central U.S. and Northeast; Critical Fire Weather in the Four Corners

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Severe thunderstorms are forecast from parts of the central High Plains into the Upper Midwest, and across parts of the Northeast. Critical fire weather conditions will continue across portions of the Four Corners and Great Basin. Read More >

Lake Effect Summary - February 12, 2015

Maximum Snowfall: Lake Erie 3.1" (Colden); Lake Ontario 13.2" (Oswego)

Duration: 12 hours +/-

Flake Scale: 1 flake*

The 9^th lake effect snow event of the winter season was a short lived band of snow across Oswego County on February 12^th. Following a clipper low that passed just to the north of Lake Ontario early Thursday morning an arctic front dropped southward across Lake Ontario. This front was dropping into a lake aggregate trough that developed over the lake within this cold airmass. Temperatures at 850 hPa were falling through the negative teens, and into the low negative 20s Celsius.

As temperatures aloft fell, lake effect parameters rose, with lake equilibrium levels rising to near 10k feet, and lake instability moderately rising.

This arctic front brought additional strong convergence along the eastern end of Lake Ontario, with the convergence enhancing the band of lake effect snow. A uniform 290 northwest flow pushed the lake effect snow inland across Oswego County through the afternoon and evening hours and dropped up to a foot of snow locally. Snowfall rates reached 2 to 3 inches per hour with this event. As the snow band shifted on land, and wind shear increased behind the arctic front the band of snow diminished quickly by mid evening. Additionally, several inches of snow fell within a narrow band of snow across northwestern Monroe County.

Here are some representative snow amounts from this event.

Off Lake Erie...

3.1 inches... Colden

3.0 inches... Williamsville

2.7 inches... Buffalo Arpt.

Off Lake Ontario...

13.2 inches... Oswego

12.3 inches... Minetto

9.1 inches... Palermo

8.6 inches... Fulton