A moist theta-E ridge, a developing 700 mb low, and an upper level jet speed maximum lifted a negatively tilted trough through South Central Idaho early on the 27th producing heavy snow showers in Twin Falls County.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 BOI wrote it up.
A moist theta-E ridge, a developing 700 mb low, and an upper level jet speed maximum lifted a negatively tilted trough through South Central Idaho early on the 27th producing heavy snow showers in Twin Falls County.
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 Boise, ID wrote its last area forecast discussion before the first event at Feb 26, 9:00 PM MST, 3 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 900 PM MST MON FEB 26 2007 .DISCUSSION...LARGE POOL OF COOL MOIST AIR OVER THE PACIFIC NORTHWEST INCLUDING ALL OF IDAHO. THIS AIRMASS WILL BE SLOW TO MOVE OUT OF THE AREA THUS COOL TEMPERATURES AND SHOWERS IN THE FORECAST THROUGH THE COMING WEEKEND. THERE WILL LIKELY BE MANY BANDS OF PRECIP MOVING OVER THE AREA WITH SUBSTANTIAL BREAKS BETWEEN THE BANDS. AS THE MAIN POOL OF COOL AIR MOVES EAST THURSDAY WE COULD BE IN STORE FOR A GOOD OVER RUNNING PRECIP EVENT THURSDAY NIGHT INTO FRIDAY MORNING. VERY MOIST AIR MOVING OVER THE RECEDING COLD POOL COULD PRODUCE FAIR AMOUNT OF PRECIPITATION. CURRENT FORECAST HAS THIS ALL WELL IN HAND SO NO CHANGES. && .AVIATION...CONVECTIVE SNOW SHOWERS HAVE BECOME ISOLATED THIS EVENING AS THE AIRMASS GRADUALLY STABILIZES WITH SURFACE HEATING CUT OFF. CONDITIONS ARE MAINLY VFR WITH LOCAL IFR NEAR CONVECTION. WIDELY SCATTERED SNOW SHOWERS WILL REDEVELOP TUESDAY AFTERNOON MAINLY OVER THE MOUNTAINS AND IN THE MAGIC VALLEY AREA. WINDS ALOFT WILL BE LIGHT TO MODERATE FROM THE SOUTHWEST. SURFACE WINDS WILL BE LIGHT TO MODERATE FROM THE SOUTHEAST. && .PREV DISCUSSION...TONIGHT THROUGH WEDNESDAY...A MOIST THETA-E RIDGE WILL DRIFT NORTHEAST FROM NE CA THIS AFTERNOON TO CENTRAL IDAHO TUESDAY MORNING. A DEVELOPING 700 MB LOW WILL DRAG A COLD FRONT THROUGH THE REGION. THE LOW WILL ALSO ENHANCE SNOW...AND VALLEY RAIN AND SNOW UNTIL 6Z BELOW 3500 FEET...OVER SE OREGON TONIGHT AND OVER SOUTH CENTRAL IDAHO THROUGH AROUND 18Z TUESDAY MORNING. AN UPPER LEVEL SPEED MAX AROUND 50KTS AT H5 OVER CENTRAL CALIFORNIA WILL LIFT A PORTION OF A NEGATIVELY TILTED TROUGH THROUGH SE OREGON THIS EVENING AND SW IDAHO TONIGHT. WITH THESE FEATURES AN AXIS OF INSTABILITY WITH ISOLATED THUNDERSTORMS IS EXPECTED FROM THE BLUES THROUGH JORDAN VALLEY THIS EVENING. DENDRITIC GROWTH LIFT AND DEEP MOISTURE IS FAVORABLE AT BOISE AROUND 2Z AND AGAIN ABOUT 11Z. FOR TUESDAY NIGHT INTO OREGON AND FOR WEDNESDAY ACROSS SW IDAHO YET ANOTHER SURGE OF PACIFIC MOISTURE WITH WETTING VALLEY RAIN AND A ROUND OF MODERATE MOUNTAIN SNOW IS EXPECTED FROM A SYSTEM WHICH AT 2 PM WAS AROUND 40-45N AND 130W OR 700 MILES WEST OF BOISE. HIGHS WEDNESDAY ARE EXPECTED TO BE THE COOLEST OVER THE AREA SINCE POST COLD FRONTAL FLOW LAST FRIDAY AND ABOUT 10F COLDER THAN NORMAL. LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY...COLD TROUGH DIRECTLY OVER THE INTERMOUNTAIN WEST WEDNESDAY NIGHT INTO THURSDAY FOR SEASONABLY COOL TEMPERATURES AND CONTINUED CHANCES FOR SNOW SHOWERS. AM EXPECTING THURSDAY MORNING TO BE THE COOLEST MORNING OF THE WEEK WITH THE GFS INDICATING 500 MB TEMPERATURES AROUND 36 DEGREES BELOW ZERO. SYSTEM WILL BEGIN TO SHIFT OUT OF THE AREA THURSDAY EVENING INTO FRIDAY MORNING...THOUGH SCATTERED SHOWERS WILL STILL LINGER. WARM FRONT WILL SPREAD ADDITIONAL PRECIPITATION ACROSS THE CWA DURING THE DAY ON FRIDAY AND SO I ADJUSTED POPS UPWARD. THIS WARM ADVECTIVE PATTERN WILL HELP TO MODERATE TEMPERATURES AND BY SATURDAY TEMPERATURES WILL RETURN TO NEAR NORMAL. A DIRTY RIDGE BEGINS TO BUILD INTO THE WEST ON SATURDAY...WHICH IS WHERE PREVIOUS MODEL RUNS HAD A VAST DISAGREEMENT. WHILE THE AMPLIFICATION OF THE RIDGE CURRENTLY VARIES BETWEEN MODELS...THEY ALL AGREE ON RIDGING TAKING PLACE FOR THE WEEKEND. MOISTURE WILL STILL FLOW UNDER THE RIDGE AND SO HAVE KEPT POPS CLOSE TO CLIMATOLOGY FOR SATURDAY. RIDGING BEGINS TO DETERIORATE AND DRIFT EASTWARD LATE SUNDAY...WHILE MAINTAINING DEEP MOISTURE THROUGH THE END OF THE PERIOD. WEAK SOUTHWESTERLY FLOW CONTINUES...HOWEVER...KEEPING TEMPERATURES NEAR NORMAL. HAVE INCREASED CONFIDENCE IN THIS SOLUTION...AS ECMWF/GFS HAVE BECOME MORE IN PHASE SINCE PREVIOUS MODEL RUN. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && WEATHER.GOV/BOISE DISCUSSION.........PRF AVIATION............JT PREV SHORT TERM.....VM PREV LONG TERM...DF/MT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 512 AM MST MON FEB 26 2007 IDZ011>016-028>030-ORZ061>064-271215- WEST CENTRAL MOUNTAINS-LOWER TREASURE VALLEY ID-BOISE MOUNTAINS- UPPER TREASURE VALLEY-SOUTHWEST HIGHLANDS-WESTERN MAGIC VALLEY- CAMAS PRAIRIE-OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY- HARNEY COUNTY-BAKER COUNTY-MALHEUR COUNTY- LOWER TREASURE VALLEY OR- 512 AM MST MON FEB 26 2007 /412 AM PST MON FEB 26 2007/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL IDAHO...SOUTHWEST IDAHO...WEST CENTRAL IDAHO...NORTHEAST OREGON AND SOUTHEAST OREGON. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
1 heavy snow. Local standard time, as filed.
Four to five inches of snow fell in the Southern Twin Falls County zone from midnight to six A.M.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2007Every state in 2007This day in weather historyWarnings in Idaho, February 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 2026-09-24. Each event’s entry at NCEI: 15444.