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
Tonight Partly Cloudy then Patchy Fog Lo 31 °F	Tonight Fog late Low: 26°	NWS: Patchy fog between 4am and 5am. Partly cloudy, with a low around 31. Northeast wind 1 to 5 mph. OlallaWx: Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Moderate fog in the evening, then patchy light fog after midnight. Low 26°. Wind north around 4 mph, gusting to 17 mph, in the evening, becoming near calm after midnight.
Friday Patchy Fog then Sunny Hi 45 °F	Friday Fog a.m. High: 45°	NWS: Patchy fog before 7am. Sunny. High near 45, with temperatures falling to around 42 in the afternoon. Wind chill values as low as 25. North northeast wind 5 to 8 mph. OlallaWx: Sunny. Patchy light fog in the morning. High 45°. Wind north around 3 mph.
Friday Night Mostly Clear Lo 29 °F	Friday night Clear Low: 20°	NWS: Mostly clear, with a low around 29. Wind chill values as low as 25. Northeast wind 5 to 8 mph. OlallaWx: Clear. Cold. Low 20°. Wind north around 2 mph.
Saturday Sunny Hi 44 °F	Saturday Mostly Sunny High: 45°	NWS: Sunny, with a high near 44. Wind chill values as low as 25. North northeast wind around 5 mph. OlallaWx: Sunny in the morning, becoming mostly sunny in the afternoon. High 45°. Wind northeast near calm.
Saturday Night Mostly Clear Lo 28 °F	Saturday night Partly Cloudy Low: 21°	NWS: Mostly clear, with a low around 28. East northeast wind around 5 mph. OlallaWx: Fair to partly cloudy in the evening, becoming clear after midnight. Cold. Low 21°. Wind north near calm.
Sunday Mostly Sunny Hi 44 °F	Sunday Partly Cloudy High: 45°	NWS: Mostly sunny, with a high near 44. OlallaWx: Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 45°. Wind east-northeast near calm.
Sunday Night Mostly Cloudy Lo 31 °F	Sunday night Mostly Cloudy Low: 30°	NWS: Mostly cloudy, with a low around 31. OlallaWx: Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 30°. Wind south-southeast near calm.