Super Convergence Zone Dumps Heavy Rain
One of the virtually striking peculiarities of western Washington weather condition is the Puget Sound convergence zone (PSCZ), which tin create a heavy band of atmospheric precipitation across northern Puget Sound together with into the Cascades.
The PSCZ results when low-level winds on the coast are westerly (form the west), displace only about the Olympics, together with and then converge together over Puget Sound, producing upward motion, clouds together with precipitation.
This is just what occurred Sat evening, every bit illustrated past times the plot of surface observations at seven PM (a large scale together with unopen upwards sentiment is shown below)
There was substantial convection together with thunderstorms inwards that heavy atmospheric precipitation band, together with lots of lightning was noted past times the regional lightning sensors (see below-24h lightning ending 1 AM Sunday)
Seattle RainWatch combines radar together with observations to supply a expert gauge for rainfall. Here is the RainWatch 24-h total ending five AM Sunday. Influenza A virus subtype H5N1 substantial expanse got 1-2 inches, which fifty-fifty to a greater extent than inwards express regions. Pouring over Snohomish County but downtown Seattle was dry. You got to dearest living only about here.
The PSCZ results when low-level winds on the coast are westerly (form the west), displace only about the Olympics, together with and then converge together over Puget Sound, producing upward motion, clouds together with precipitation.
This is just what occurred Sat evening, every bit illustrated past times the plot of surface observations at seven PM (a large scale together with unopen upwards sentiment is shown below)
The air was relatively unstable Sat even together with an upper score trough was producing additional uplift....so the convergence zone actually revved up.
Now permit me print you...here is a radar ikon only about seven PM Saturday. Red indicates rattling heavy rain, together with xanthous is moderate to heavy. Intense convergence zone band. Note the precipitous southern border of the rainfall, which is rattling typical of rigid convergence zones.
Seattle RainWatch combines radar together with observations to supply a expert gauge for rainfall. Here is the RainWatch 24-h total ending five AM Sunday. Influenza A virus subtype H5N1 substantial expanse got 1-2 inches, which fifty-fifty to a greater extent than inwards express regions. Pouring over Snohomish County but downtown Seattle was dry. You got to dearest living only about here.
Local pelting gauges had 24-h rainfall totals that were consistent amongst RainWatch, amongst over ii inches only about Monroe.
I know person that had a marriage celebration close Monroe...thankfully they had tents, but it was a soggy affair.
Now the actually exciting business office for me is how good this lawsuit was forecast....our high-resolution models was rattling skillful, days ahead of time. To illustrate, hither is the forecast from the UW WRF high-resolution (4/3 km grid spacing) model for the 24h atmospheric precipitation ending five AM Sunday.
Nice convergence zone. It underplayed the total amounts a bit...but it was clear that Snohomish County was going to endure drenched, which downtown Seattle would endure dry.
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