A moist Pacific storm brought heavy snow to portions of North Central and Southwest Montana.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS TFX wrote it up.
A moist Pacific storm brought heavy snow to portions of North Central and Southwest Montana.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Great Falls, MT wrote its last area forecast discussion before the first event at Apr 17, 2:09 PM MST, 1 hour 37 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 309 PM MDT TUE APR 17 2007 .DISCUSSION... TONIGHT THROUGH THURSDAY...A DEEP UPPER TROUGH NEAR THE WEST COAST WILL SWING INLAND TONIGHT AND THEN ROTATE NE INTO EASTERN MONTANA ON THURSDAY. A WET PATTERN IS IN STORE FOR THE AREA WITH COOLING TEMPERATURES. AS FOR THE WINTER STORM SITUATION...HAVE UPGRADED THE WINTER STORM WATCHES TO HEAVY SNOW WARNINGS OVER THE WESTERN MOUNTAINS. ALSO IT LOOKS AS IF THE FAR NW PLAINS WILL BECOME COLD ENOUGH FOR SNOW BY LATE TONIGHT SO HAVE ADDED A SNOW ADVISORY FOR THAT AREA AS WELL. DEPENDING ON HOW THINGS PLAY OUT MIGHT NEED TO UPGRADE THE SNOW ADVISORY. AS THE UPPER TROUGH/LOW MOVES INTO EASTERN MONTANA ON THURSDAY MOISTURE WILL BACK OVER THE EASTERN PORTIONS OF THE FORECAST AREA. THE PLAINS COULD BE COLD ENOUGH BY THAT TIME THAT PRECIPITATION WOULD BE IN THE FORM OF SNOW. MIGHT NEED A SNOW ADVISORY FOR THURSDAY BUT AT THIS POINT WILL CONTINUE TO MONITOR MODEL TRENDS. AS FOR THE THUNDERSTORM SITUATION...HAVE DECIDED TO LEAVE IN THE THREAT OF THUNDERSTORMS OVER PORTIONS OF THE SOUTH FOR THIS EVENING. INSTABILITY IS MARGINAL BUT CAN NOT RULE OUT A STRIKE OR TWO. FOR WEDNESDAY THINK THE MAIN THREAT FOR THUNDERSTORMS WILL BE EAST OF THE FORECAST AREA SO HAVE LEFT OUT MENTION OF SAME EVEN THOUGH SOME GUIDANCE SUGGESTS THERE COULD BE SOME THUNDERSTORMS OVER THE FAR EASTERN ZONES. BLANK THURSDAY NIGHT THROUGH SUNDAY NIGHT...CLOSED LOW MOVING NORTH OUT OF EASTERN MONTANA WILL BRING WRAP AROUND SHOWERS TO CENTRAL MONTANA THURSDAY NIGHT. WILL SEE A BREAK IN PRECIPITATION FRIDAY AS THE AREA IS IN BETWEEN SYSTEMS. THE NEXT SYSTEM ON SATURDAY IS LOOKING MORE AND MORE LIKE ITS GOING TO MISS THE AREA TO THE SOUTH...THUS HAVE LOWERED POPS FOR THIS PERIOD. SUNDAY LOOKS LIKE THE BEST CHANCE FOR PRECIPITATION AS A SHORT WAVE MOVES ACROSS THE NORTHERN PART OF THE U.S. TEMPERATURES DURING THIS PERIOD WILL BE NEAR NORMAL FOR THE ENTIRE TIME FRAME. MEIER MONDAY AND TUESDAY...A QUICK MOVING PACIFIC TROUGH OF LOW PRESSURE IS EXPECTED TO PASS THROUGH MONDAY CAUSING SCATTERED SHOWERS FOR MUCH OF THE REGION. A SHORT BREAK TUESDAY BEFORE A WEAK HIGH PRESSURE BUILDS INTO WESTERN MONTANA A HEAD OF THE NEXT PACIFIC SYSTEM MOVING INTO THE PACIFIC NORTHWEST. TEMPERATURES WILL BE NEAR NORMAL THROUGH THE PERIOD. SAUCIER && .AVIATION... UPDATED 0015Z. A DEEP UPPER LEVEL TROUGH ALONG THE PACIFIC COAST AT 00Z WILL KEEP A MOIST AND UNSETTLED SOUTHWEST FLOW ALOFT OVER MONTANA TONIGHT. SCATTERED SHOWERS AND MVFR CONDITIONS WILL DEVELOP OVER THE AREA THIS EVENING...MAINLY SOUTH AND EAST OF KCTB. ISOLATED THUNDERSTORMS WITH GUSTY WINDS ARE ALSO POSSIBLE DURING THIS TIME SOUTH AND EAST OF A KHMM-KGTF-KHVR LINE. THE AIRMASS WILL GENERALLY STABILIZE AFTER 02Z. THE UPPER LEVEL TROUGH MOVES INTO THE GREAT BASIN BY WEDNESDAY MORNING...FOR AN INCREASINGLY MOIST SOUTHERLY FLOW OVER THE FORECAST AREA. A SURFACE LOW PRESSURE AREA MOVES INTO SOUTH CENTRAL MONTANA DURING THIS TIME FOR NORTHERLY UPSLOPE SURFACE WINDS. WIDESPREAD PRECIPITATION WILL DEVELOP OVER WESTERN MONTANA AND SPREAD INTO CENTRAL MONTANA...WITH MORE WIDESPREAD MVFR CONDITIONS DEVELOPING AFTER 03Z. SNOW WILL BEGIN MIXING WITH THE RAIN AFTER 06Z AS A COLDER AIRMASS BEGINS MOVING INTO THE AREA. BRITTON && .PRELIMINARY POINT TEMPS/POPS... GTF 39 47 32 38 / 50 80 50 90 CTB 36 36 30 39 / 90 90 50 60 HLN 37 46 34 47 / 70 90 50 60 BZN 38 55 32 49 / 40 70 70 70 WEY 31 40 27 38 / 60 70 70 60 DLN 37 41 29 45 / 80 90 40 30 HVR 43 57 37 41 / 30 50 90 90 LWT 38 58 32 36 / 30 60 60 80 && .TFX WATCHES/WARNINGS/ADVISORIES... HEAVY SNOW WARNING FROM 3 AM TO 6 PM MDT WEDNESDAY ABOVE 5000 FEET FOR MTZ014-048-052. HEAVY SNOW WARNING FROM 9 PM THIS EVENING TO 6 AM MDT WEDNESDAY FOR MTZ008. HEAVY SNOW WARNING FROM 3 AM WEDNESDAY TO MIDNIGHT MDT WEDNESDAY NIGHT ABOVE 5000 FEET FOR MTZ009. SNOW ADVISORY FROM 3 AM WEDNESDAY TO MIDNIGHT MDT WEDNESDAY NIGHT BELOW 5000 FEET FOR MTZ009-010. && SHORT TERM...BLANK LONG TERM...COULSTON AVIATION...COULSTON WEATHER.GOV/GREATFALLS
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</html>6 heavy snow. Local standard time, as filed.
Reported snow amounts include 16 inches at the Beagle Springs SNOTEL site (Lima 23S), 13 inches at the Lemhi Ridge SNOTEL site (Grant 17W) and 7 inches at Jackson 15SW.
Reported snow amounts include 11 inches at the Nevada Ridge SNOTEL site (Helena 27NW), 8 inches at the Copper Camp SNOTEL site (Lincoln 6N) and 7 inches at the Wood Creek SNOTEL site (Augusta 21W).
Reported snow amounts include 7 inches at the Wood Creek SNOTEL site (Augusta 21W).
Reported snow amounts include 12 inches in the Bears Paws Mountains (Rocky Boy 8N).
Reported snow amounts include 10 inches at Lloyd 5S.
Reported snow amounts include 9 inches at the Crystal Lake SNOTEL site (Lewistown 18SSW) and 6 inches at Lewistown.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2007Every state in 2007This day in weather historyWarnings in Montana, April 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 21563, 21565, 21567, 21564, 21566, 21568.