SRUS45 KTFX 181231 RRMTFX Hydrologic Observations National Weather Service Great Falls MT 631 AM MDT Mon May 18 2026 .A X4521113 0518 Z DH1230/DVH24/SFV 5.0"LAT=45.28915|LON=-111.392|MT|MADISON|3 WNW BIG SKY|TRAINED SPOTTER" $$