Extreme start to August with all-time records threatened in Pac NW, 20-30 below norm on Plains

Written by on August 2, 2017 in Summer 2017, United States of America with 0 Comments

According to the CFSv2 weeklies, the first half of August is looking cool for the central and Midwestern portion of the country. Warm either side.

The second half looks less cool and becoming warmer than normal for most but with the strongest positive over top, we need to closely watch the tropics and threat to US coast.

In particularly the upcoming 7 days, first 7 of the month of course, the chill is centred over E Colorado/W Kansas while MAJOR, all-time record threatening heat affects the Northwest from NorCal to Washington extending up into British Columbia.

Credit: weather.com

Credit: weather.com

Stark contrast to the Pacific Northwest.

Credit: weather.com

Credit: weather.com

Credit: weather.com

Portland shall threaten it’s all-time record of 107 while Seattle is unlikely to threaten it’s all-time record of 103 but will threaten the rare 100 degree mark.

The record dryness of July 2017 will be a crucial factor in driving temperatures to record levels.

From weather.com

Abnormally Dry Conditions

Wet days are not a common occurrence in Seattle during July since it’s typically the driest month of the year.
The dryness in July 2017, however, has entered the record books. No measurable rain was observed at Sea-Tac Airport through the entire month.
Seattle has had only 10 other months without measurable precipitation in records dating to 1894, most recently in July 2013 and August 2012.

Additionally, as of July 31, Seattle is in the midst of its fourth-longest dry streak on record at 44 days, last seeing rain on June 17 – but this comes with a bit of an asterisk.
Many Seattleites saw drizzle July 27, but these tiny raindrops only accumulated to a trace of rainfall. This is not considered measurable rainfall, which means that Sea-Tac – the official measurement site for Seattle – continues its dry streak.

In Portland, this may be only the eighth heat wave in 77 years featuring at least three consecutive days of triple-digit highs. There’s a chance that Portland could see four days in a row with triple-digit heat this week, and that would be a first since August 1981.

CFSv2 weeklies through August.

Credit: Tropical Tidbits

Credit: Tropical Tidbits

Credit: Tropical Tidbits

Credit: Tropical Tidbits

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