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
This Afternoon Partly Sunny Hi 83 °F	This afternoon Partly Cloudy High: 76°	NWS: Partly sunny. High near 83, with temperatures falling to around 81 in the afternoon. West southwest wind around 7 mph. OlallaWx: Partly cloudy. High 76°. UV index up to 3. Wind west-southwest around 3 mph.
Tonight Partly Cloudy Lo 59 °F	Tonight Fog Low: 52°	NWS: Partly cloudy, with a low around 59. West southwest wind around 7 mph. OlallaWx: Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog. Low 52°. Wind southwest near calm.
Saturday Partly Sunny Hi 78 °F	Saturday Fog a.m. High: 78°	NWS: Partly sunny, with a high near 78. West wind around 6 mph. OlallaWx: Partly cloudy. Light to moderate fog in the morning. Warm. High 78°. UV index up to 6. Wind southwest near calm in the morning, becoming west-northwest in the afternoon.
Saturday Night Partly Cloudy Lo 59 °F	Saturday night Fog late Low: 54°	NWS: Partly cloudy, with a low around 59. North northwest wind around 6 mph. OlallaWx: Partly cloudy. Patchy light fog after midnight. Low 54°. Wind north-northwest near calm.
Sunday Mostly Sunny Hi 77 °F	Sunday Fog a.m. High: 79°	NWS: Mostly sunny, with a high near 77. Southwest wind around 6 mph. OlallaWx: Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Warm. High 79°. UV index up to 6. Wind west-southwest around 2 mph in the morning, becoming northeast in the afternoon.
Sunday Night Partly Cloudy Lo 59 °F	Sunday night Fog late Low: 52°	NWS: Partly cloudy, with a low around 59. OlallaWx: Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 52°. Wind north-northwest near calm in the evening, becoming southwest after midnight.
Labor Day Mostly Sunny Hi 78 °F	Monday Fog a.m. High: 80°	NWS: Mostly sunny, with a high near 78. OlallaWx: Partly to mostly sunny in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. Warm. High 80°. UV index up to 6. Wind southwest around 2 mph in the morning, becoming west-northwest in the afternoon.