From inciweb:
https://inciweb.nwcg.gov/incident/article/5510/38865/
Short Term Shift in Weather May Impact Fire Behavior Today
The weather forecast for today includes the possibility of dry lightning and gusty winds as a cold front is expected this morning. A trace amount of precipitation may fall on the fire but it is not expected to moderate fire growth long-term. Warmer temperatures are expected to return later in the week. Firefighters will be alert to changing conditions.
Management of the Sprague Fire will transition to the Northern Rockies Type II Wildland Fire Management Team on August 25. The team brings expertise in managing long-duration fires in this region. Portions of the fire are expected to burn until extinguished naturally by significant rain or snow. Suppression actions, including helicopter water drops and hose lays and sprinklers, will continue on portions of the fire. Approximately 120 personnel are assigned to the fire, including a wildland fire module, and a hand crew.
The Sprague Fire burned actively yesterday. The fire perimeter is now estimated to be 1,500 acres. Fire activity may be moderated today due to lower temperatures and humidity. Westerly winds are forecasted. The northwest edge of the fire is currently holding in the Snyder Creek drainage. Small spot fires up to two acres in size have become established on top of the south side of Lincoln Ridge. The Sprague Fire was started by lightning on August 10, 2017. It is burning in a mixed conifer forest. The fire is located in steep, rugged terrain, approximately nine miles northeast of West Glacier, Montana.
Firefighters continue to use hose lays and sprinklers near the west edge of the fire at the Crystal Ford footbridge. Sprinklers are set along the first quarter mile of the Snyder Lake Trail as well as the trail to Fish Lake. Firefighters continue proactive clearing of brush to create defensible space around structures in the Lake McDonald area, in the event the fire moves towards these structures.
Firefighters are staged at Sperry Chalet. Structure protection is in place, including two water tanks, hose lays and sprinklers. Given the location of the chalet in a rocky, subalpine environment with sparse vegetation, fire managers are confident that these structure protection measures and personnel can protect the historic buildings if needed.