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 47 °F	This afternoon Fog High: 47°	NWS: Partly sunny. High near 47, with temperatures falling to around 45 in the afternoon. North wind around 6 mph. OlallaWx: Mostly cloudy to cloudy. Patchy light fog. High 47°. Wind north around 2 mph.
Tonight Mostly Cloudy then Patchy Fog Lo 38 °F	Tonight Fog Low: 39°	NWS: Patchy fog between 2am and 3am. Mostly cloudy, with a low around 38. East northeast wind around 3 mph. OlallaWx: Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Patchy light fog. Low 39°. Wind north near calm.
Wednesday Mostly Cloudy Hi 45 °F	Wednesday Fog a.m. High: 43°	NWS: Mostly cloudy. High near 45, with temperatures falling to around 43 in the afternoon. South southeast wind around 2 mph. OlallaWx: Dense overcast. Patchy light fog in the morning. High 43°. Wind south-southeast near calm.
Wednesday Night Light Rain Lo 40 °F	Wednesday night Fog Low: 40°	NWS: Rain after 10pm. Mostly cloudy, with a low around 40. South southeast wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts less than a tenth of an inch possible. OlallaWx: Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog. Low 40°. Wind south-southwest near calm.
Thursday Light Rain Hi 46 °F	Thursday Rain likely High: 44°	NWS: Rain. Cloudy, with a high near 46. South wind 5 to 8 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible. OlallaWx: Dense overcast. Patchy light fog. Rain likely. High 44°. Wind south-southwest around 3 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Thursday Night Light Rain Lo 44 °F	Thursday night Chance rain Low: 41°	NWS: Rain. Cloudy, with a low around 44. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible. OlallaWx: Cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 41°. Wind south-southwest around 4 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Friday Light Rain Hi 53 °F	Friday Chance rain High: 52°	NWS: Rain. Cloudy, with a high near 53. OlallaWx: Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog. A chance of rain. Breezy. High 52°. Wind south-southwest around 11 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.