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
Overnight Mostly Cloudy Lo 34 °F	Tonight Partly Cloudy Low: 36°	NWS: Mostly cloudy, with a low around 34. South southwest wind around 12 mph. New rainfall amounts less than a tenth of an inch possible. OlallaWx: Partly cloudy in the evening, becoming cloudy after midnight. Low 36°. Wind south-southwest around 4 mph.
Tuesday Chance Rain And Snow Showers then Light Rain Hi 44 °F	Friday Chance rain High: 43°	NWS: A chance of rain and snow showers between 8am and 11am, then rain. Mostly cloudy, with a high near 44. Wind chill values as low as 25. South southwest wind 13 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible. OlallaWx: Dense overcast. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 43°. Wind south-southwest around 4 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Tuesday Night Light Rain Lo 38 °F	Friday night Rain likely Low: 37°	NWS: Rain. Cloudy. Low around 38, with temperatures rising to around 40 overnight. South southwest wind 15 to 18 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible. OlallaWx: Cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a slight chance of rain after midnight. Low 37°. Wind south-southwest around 5 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Wednesday Rain Hi 49 °F	Saturday Chance rain High: 43°	NWS: Rain. Cloudy, with a high near 49. South wind 6 to 16 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible. OlallaWx: Mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 43°. Wind south-southwest around 3 mph in the morning, becoming northeast in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Wednesday Night Rain Lo 41 °F	Saturday night Fog Low: 34°	NWS: Rain before 2am, then rain showers. Cloudy, with a low around 41. Southwest wind 15 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible. OlallaWx: Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog. Low 34°. Wind north-northeast around 6 mph.
Thursday Rain Hi 46 °F	Sunday Fog a.m. High: 47°	NWS: Rain showers before 11am, then rain. Cloudy, with a high near 46. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible. OlallaWx: Partly to mostly cloudy. Light to moderate fog in the morning. High 47°. Wind north-northeast around 6 mph.
Thursday Night Rain Lo 38 °F	Sunday night Fog late Low: 33°	NWS: Rain. Cloudy, with a low around 38. OlallaWx: Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 33°. Wind north-northeast near calm.