textproduct: Portland
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
SYNOPSIS
Ever-changing pattern this week with a warming trend on Tuesday into Wednesday. Higher confidence on Tuesday's highs being well above normal, but some level of uncertainty lies with Wednesday still as there is another potential weather pattern that would disrupt as significant of heating. Thunderstorms remain possible on Wednesday, especially over the Lane and Linn county Cascades. Cooler with onshore flow starting Thursday.
LONG TERM...Thursday through Monday
By Thursday and Friday, the ridge is expected to weaken as a broader trough begins to press into the Pacific Northwest. That should allow temperatures to ease a few degrees late in the week, though values may still remain somewhat above average for late July. Beyond Friday, there is currently no strong signal for meaningful precipitation, and temperatures remain mild in the mid 80s. -12
AVIATION
Continued VFR flying conditions expected throughout the period at inland terminals with sct/bkn high clouds and unrestricted vis. Nearly calm winds tonight will build to around 5 kt out of the north to northwest by 16-20z Tue.
Along the coast, resurgent low marine stratus is again expected, favoring IFR/LIFR conditions through much of the overnight period. LIFR cigs/vis are favored (80% chance of occurrence) at KONP, with chances decreasing to the north; IFR conditions are instead favored (60% chance) at KAST. Slow improvement to MVFR/VFR is expected after 16-18z Tue. Nearly calm winds tonight will build out of the west to northwest at 5-10 kt by 18-21z Tue.
KPDX AND APPROACHES...VFR conditions beneath sct/bkn high clouds and light northwest winds are expected. Winds will build slightly to 4-8 kt by Tuesday afternoon. -36
MARINE
A typical summertime pattern will continue through the middle of this week with persistent north to northwest winds over the coastal waters. Winds then shift southwest to westerly Thursday into the weekend as weak low pressure develops over the waters. Winds will remain light less than 10-15 kts. Seas will be 3-6 ft at 8-9 seconds through the weekend. -03
PQR WATCHES/WARNINGS/ADVISORIES
OR...Heat Advisory from 10 AM Tuesday to 11 PM PDT Wednesday for ORZ108>115-120>122.
WA...Heat Advisory from 10 AM Tuesday to 11 PM PDT Wednesday for WAZ204>207-209-210.
PZ...None.
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