878 FNUS76 KOTX 282057 FWSOTX Spot Forecast for Hamilton Fire...USFS National Weather Service Spokane WA 157 PM PDT Sun Jun 28 2026 Forecast is based on forecast start time of 1200 PDT on June 28. .DISCUSSION... A deep low pressure system east of the area will promote strong downslope west-northwest winds today with winds increasing through the morning. Afternoon gusts can be as high as 35 mph from the northwest. Breezy winds will continue through tonight and Monday. Relative humidity will drop to near 30% this afternoon before recovering to about 70-75% overnight. If conditions become unrepresentative, contact the National Weather Service. *************************************************************** Forecasts for 20 foot wind speeds (valleys and ridge tops) are 10 minute averages reflecting RAWS wind. ***Ventilation Index is derived from transport wind multiplied by the mixing height divided by 100. Categories: low (< 200), moderate (200-500), high (500-800), and very high (> 800). *************************************************************** .REST OF TODAY... Sky/weather.........Partly sunny. Isolated showers. CWR.................10 percent. Chance of lightning.5 percent. Max temperature.....Around 78. Min humidity........27-32 percent. Wind (20 ft)........Northwest winds 14 to 22 mph with gusts to around 33 mph. Mixing height.......5000 ft AGL increasing to 6500 ft AGL in the afternoon. Transport winds.....Northwest 24 mph. Ventilation Index...Very high (922) increasing to very high (1173) in the afternoon. .TONIGHT... Sky/weather.........Mostly cloudy. Chance of rain showers through 2200. CWR.................20 percent. Chance of lightning.10 percent. Min temperature.....Around 51. Max humidity........70-75 percent. Wind (20 ft)........Northwest winds 10 to 16 mph with gusts to around 28 mph diminishing to 8 to 15 mph after 2200. Mixing height.......4000 ft AGL falling to 500 ft AGL decreasing to 1000 ft AGL overnight. Transport winds.....Northwest 16 to 21 mph. Ventilation Index...Very high (862) decreasing to low (118) overnight. .MONDAY... Sky/weather.........Mostly cloudy then becoming mostly sunny. CWR.................0 percent. Chance of lightning.5 percent. Max temperature.....Around 81. Min humidity........28-33 percent. Wind (20 ft)........Northwest winds 6 to 11 mph with gusts to 20 mph after 1000. Mixing height.......3000 ft AGL increasing to 4500 ft AGL in the afternoon. Transport winds.....Northwest 12 to 17 mph. Ventilation Index...Moderate (436) increasing to moderate (486) in the afternoon. $$ Forecaster...AB Requested by...Aana Kulaas Type of request...WILDFIRE .TAG 2616377.0/OTX .DELDT 06/28/26 .FormatterVersion 2.0.0 .EMAIL aana.kulaas@usda.gov