FastCast—Saturday, Sep. 16 to Tuesday, Sep. 19:
Another hot day is expected across the lowlands on Saturday, with highs again reaching the upper 70s to mid 80s. Substantial cooling is expected on Sunday, with highs dropping to the low to mid 70s. Clouds will increase for Sunday and Monday, with a chance of areas of light drizzle. Monday’s highs will only reach the mid 60s to low 70s. Tuesday will bring a chance of morning showers with highs in the upper 60s. Lows will reach the upper 40s to low 50s, except the mid to upper 50s on Monday morning. Fire danger will be elevated on Saturday, with relative humidity reaching 25-40% in the lowlands (much lower through Sunday in Eastern Washington). Remember that burn bans are in effect, and any fires that start can spread quickly.
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Continue reading the full blog below!
Warm weather is ahead on Saturday in Western Washington and through Monday in Eastern Washington. Let’s take a look at the forecast below.
First, the European model forecast for highs on Saturday.
The European model predicts highs in the mid 70s to low 80s across the lowlands on Saturday, with the coast reaching the low to mid 60s, the Willamette Valley reaching the mid to upper 80s, and Eastern Washington reaching the upper 80s to mid 90s.
The GFS model, which had more accurate predictions for Friday, is below, showing highs for Saturday.
The GFS forecast shows lowland highs in the low to mid 70s from Everett north and the low to mid 80s from Everett south (including Seattle). The coast will reach the low to mid 60s, the Willamette Valley will reach the mid 80s to low 90s, and Eastern Washington will reach the mid 80s to mid 90s.
Next, we’ll look at the significant cooling both models forecast for Sunday. The European model is below.
The European model shows lowland highs dropping to the upper 60s to low 70s, the coast remaining in the low to mid 60s, and the Willamette Valley dropping to the upper 70s to low 80s. Eastern Washington will reach the low 80s to mid 90s (with 90º+ relegated to the Columbia Basin).
Let’s see how the GFS’s Sunday prediction stacks up to the European.
The GFS shows lowland highs in the low to mid 70s, coastal highs in the low to mid 60s, and the Willamette Valley in the mid 70s to low 80s. Eastern Washington will cool to upper 70s to low 90s.
On Monday, temperatures will cool further, as seen in the European model forecast below.
On Monday, temperatures will continue dropping in the lowlands, with highs reaching the low 60s to low 70s. The coast will reach the upper 50s to low 60s, the Willamette Valley will reach the low to mid 70s, and Eastern Washington wil cool to the low 70s to mid 80s.
The GFS shows a nearly identical forecast for Monday, as seen below.
The GFS shows lowland highs in the mid 60s to low 70s, coastal highs in the upper 50s to low 60s, Willamette Valley highs in the mid to upper 70s, and Eastern Washington’s highs dropping to the mid 70s to mid 80s.
As temperatures cool to begin next week, precipitation chances will increase very slightly, with light rain possible through Monday night. The European Ensemble (EPS) forecast is below.
The EPS shows 0.01-0.05” possible across Western Washington, with isolated mountain areas getting up to 0.15”.
The GFS forecast (also through Monday night) shows less rain.
The GFS shows 0-0.05” for parts of Western Washington, and up to 0.1” for the NW tip of Washington and parts of the Central Cascades.
However, confidence appears to be increasing for more substantial rain in the final 7-10 days of September, so stay tuned.
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