Weather Forecast Comparison

Explanation: The NWS Forecast forecast is provided by the National Weather Service. The OlallaWx.org forecast is generated locally using WXSIM forecasting software, customized for Olalla, WA and operated by OlallaWx.org.

About the Forecasts

OlallaWx.org uses WXSIM forecasting software — a sophisticated, locally-run weather prediction system designed to provide highly customized forecasts specifically for the Olalla, WA area.

Local tuning: The forecast is calibrated using current data from local OlallaWx weather stations including the Davis Vantage Pro 2 and Ambient WS-5000.
Historical learning: OlallaWx refines NWS forecasts by learning from past local OlallaWx weather patterns.
Hands-on control: Forecasts are generated and reviewed directly at OlallaWx.org.
Frequent updates: Updated approximately every two hours.

How it compares to NWS:

Feature	NWS (National Weather Service)	OlallaWx.org via WXSIM
Forecast Scope	Broad zones (counties, metro areas)	Hyperlocal (Olalla-specific)
Update Frequency	2–4 times daily	Approximately every 2 hours
Local Station Integration	Not always included	Uses OlallaWx.org station data
Forecast Engine	Government meteorological models	Hybrid expert + AI model (WXSIM)

NWS Forecast	OlallaWx.org Forecast	Forecast
Today Sunny Hi 60 °F	Tonight Fog late Low: 37°	NWS: Sunny, with a high near 60. North northwest wind around 5 mph. OlallaWx: Clear. Patchy light fog after midnight. Low 37°. Wind north near calm.
Tonight Mostly Clear Lo 42 °F	Wednesday Fog a.m. High: 60°	NWS: Mostly clear. Low around 42, with temperatures rising to around 44 overnight. Southeast wind 2 to 6 mph. OlallaWx: Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 60°. UV index up to 3. Wind northeast near calm.
Thursday Partly Sunny then Chance Rain Showers Hi 58 °F	Wednesday night Partly Cloudy Low: 40°	NWS: A chance of rain showers after 5pm. Partly sunny. High near 58, with temperatures falling to around 56 in the afternoon. South wind 6 to 9 mph. Chance of precipitation is 40%. OlallaWx: Fair in the evening, becoming fair to partly cloudy after midnight. Low 40°. Wind south-southwest near calm.
Thursday Night Rain Showers Likely Lo 50 °F	Thursday Mostly Cloudy High: 61°	NWS: Rain showers likely. Mostly cloudy, with a low around 50. South southwest wind 7 to 12 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible. OlallaWx: Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 61°. UV index up to 2. Wind south-southwest around 3 mph.
Friday Chance Rain Showers Hi 60 °F	Thursday night Mostly Cloudy Low: 47°	NWS: A chance of rain showers. Partly sunny, with a high near 60. Southwest wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible. OlallaWx: Mostly cloudy. Low 47°. Wind south-southwest around 5 mph.
Friday Night Slight Chance Rain Showers then Chance Light Rain Lo 46 °F	Friday Chance rain High: 55°	NWS: A slight chance of rain showers before 8pm, then a chance of rain. Mostly cloudy, with a low around 46. Chance of precipitation is 30%. OlallaWx: Mostly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 55°. UV index up to 2. Wind south-southwest near calm in the morning, becoming north-northeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Saturday Rain Hi 58 °F	Friday night Fog Low: 45°	NWS: Rain. Mostly cloudy, with a high near 58. OlallaWx: Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. Low 45°. Wind northeast around 2 mph in the evening, becoming northwest after midnight.