Today (Tuesday) brings Seattle to 44 days without rain. Impressive!
Tomorrow will be dry, allowing us to tie the second longest dry-spell (45 days), and we will certainly beat it, with dry conditions guaranteed through Saturday (48 days!)
But will we beat the all time record---51 days-- which we will tie on Tuesday (Sept. 11th) if it doesn't rain?
Folks...it is going to be close. Lets start with one of the best long-range forecasting tools, the output from the North American ensemble forecasting system, in which many forecasts are considered. Consider the second panel down. The bracket shows the range of the forecasts and the colored lines show two particular forecasts--the single forecasts used in most weather forecasts (the control members). The bracket show that some members are going for rain on the 10th and 11th, with one control member giving measurable precipitation.
This increase in precipitation threat is associated with a trough passing by just to our north. Here is the upper-level (500 hPa) map for Sunday at 5 PM that illustrates this.
Take a look at the 24 hr precipitation forecast from the UW WRF system for the period ending 5 AM on Monday. Precipitation in the area, but Sea-Tac looks like it is rain shadowed by the Olympics. VERY, VERY close.
And the precipitation for the next 24-h is negligible:
Who says meteorology isn't exciting? I bet the Weather Channel sends Jim Cantore here to cover it. And I expect KING-TV's Jim Forman to be stationed at the airport all day looking for the rain (perhaps without his famous parka).
This is going to be closer than the Presidential election. You will tell your grandchildren that you lived through this.
For those interested in going to the Columbus Day Storm gathering on Oct 11th, you need to register...see information on upper right of this blog.
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Thứ Ba, 4 tháng 9, 2012
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