Thunderstorms with gusty winds, downpours Thursday

Update: The Storm Prediction Center has placed our area in a Slight Risk for severe thunderstorms today (Thursday). Stay tuned for further updates and information including a live blog post.

As a mid level disturbance moves toward the area on Thursday, a frontal boundary and convergence zone will shift near the area during the late morning to afternoon hours. The combination of the two, when juxtaposed with daytime heating and some instability, will lead to sufficient lift to develop thunderstorms during the afternoon hours. Accordingly, the Storm Prediction Center has placed parts of the area in a “Slight Risk” for severe thunderstorms.

The threat for strong to severe thunderstorms is likely to be focused west of the area beaches and shores, but heavy downpours and thunderstorms are still possible there. Farther west, over the interior parts of New Jersey and New York, more focused instability and southerly winds are more likely to work with marginally favorable wind fields to help develop thunderstorms. These storms will be capable of producing very heavy rain, frequent lightning and possibly even some small hail and gusty winds.

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Incredible photos of hail accumulation from Colorado supercell

A large supercell, which formed and moved near Denver eastward past Aurora earlier on Wednesday, produced tremendous amounts of hail which accumulated in many areas. The storm also produced a lowering wall cloud, which was observed by many storm chasers, and a possible tornado touchdown east of Denver. The variety of pictures received via social media showed the accumulating hail (a relatively rare occurrence, but more common out west due to colder air aloft) for the second straight day in Colorado. 5″ (yes, 5 inches) of hail fell in parts of Denver.

The maturing supercell also tracked nearly directly over the radar site at KFTG and the Terminal Doppler radar site at TDEN. The “shadowing” effect and the black hole/circle in the middle of the storm is a phenomenon not too often observed. When heavier precipitation moves directly over a radar site, the radar beam cannot register precipitation which is immediately near it’s location. In essence, the precipitation is falling below the radar beams, which shoot outward and upward from the radar site.

Featured image courtesy Mike Oblinsky (Twitter).

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