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Extreme  Heat  Followed by Showers and Thunderstorms

Extreme Heat Followed by Showers and Thunderstorms

Today was a day of wonderful contrasts, with file excessive temperatures adopted by thunderstorms and lightweight rain.
Picture courtesy of NWS Seattle
A line on showers and thunderstorms moved by tonight… welcome reduction from a record-breaking day of warmth.  The fashions had been suggesting for days {that a} line of showers/thunderstorms would transfer up the east aspect of the Cascades, however with solely a small probability of reaching the western lowlands.

The trigger?  A weak higher stage disturbance that helped launch the instability inherent within the heat air current over the area (see map, the arrow signifies the disturbance).

Extreme Heat Followed by Showers and Thunderstorms
The upward movement related to the higher stage characteristic was obvious within the excessive clouds that unfold over western Washington this afternoon.  And the mid-level instability was advised in some altocumulus clouds that started to type mid-afternoon (each obvious within the SpaceNeedle cam round 2 PM proven under

Extreme Heat Followed by Showers and Thunderstorms
By 7 PM, the cloud mass related to convection and thunderstorms was fairly spectacular (see under).
Extreme Heat Followed by Showers and Thunderstorms
And the radar picture at eight PM clearly indicated the showers and thunderstorms.

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I noticed a number of lighting strikes myself and the lightning community supplied additional proof.

The morning forecasts didn’t recommend an excessive amount of shifting into western Washington, however the 5 PM NOAA/NWS HRRR mannequin forecast, the best decision modeling system run by the NWS was moderately good (see forecast under for 9 PM).   My analysis group on the UW is engaged on extra superior lightning forecasting expertise, combining state-of-science mannequin output with machine studying, that ought to be capable of do higher.  This analysis is sponsored by Seattle City Light, which is worried about lightning for apparent causes.

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Finally, simply wished to notice the extraordinary excessive temperatures at this time, with a number of areas attending to 100F (see under, click on toe increase).   Some vital data had been damaged at this time, with many day by day data surpassed.  Thankfully, tomorrow must be about 10F cooler.

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