1 heavy snow, as filed by the National Weather Service.
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 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 Billings, MT wrote its last area forecast discussion before the first event at May 9, 2:25 AM MST, 1 hour 35 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BILLINGS MT
325 AM MDT TUE MAY 9 2006
.SHORT TERM...VALID FOR TDY AND WED...
STRONG COLD AIR ADVECTION AT MID LEVELS AND UPPER DYNAMICS SEEM
TO BE MAIN DRIVERS FOR BROAD AREA OF MODERATE PCPN FROM BIG HORNS
NORTH INTO ROSEBUD COUNTY EARLY THIS AM. OBSERVATIONS INDICATE
SNOW LEVEL PROBABLY NEAR 5500 FT AND WOULD NOT BE SURPRISED TO
SEE LOCAL AREAS IN BIG HORNS PUSH NEAR ADVISORY LEVEL SNOW
AMOUNTS BEFORE SUNRISE. ISSUED NOWCAST FOR A FEW HOURS EARLIER TO
MENTION POSSIBLE WINTER DRIVING CONDITIONS AT HIGHER ELEVATIONS
OF BIG HORNS.
UPPER LOW OVER CANADA TO SLIDE TOWARD NE MONTANA TODAY INTO THE
EVENING. ENERGY ROTATING AROUND UPPER LOW CURRENTLY PROVIDING LIFT
FOR PCPN IN OUR CWA. SATELLITE IMAGERY INDICATES INSTABILITY
UPSTREAM FROM OUR ZONES AS WELL DUE TO ASSOCIATED COLD POOL. THIS
UNSTABLE FLOW SHOULD PRODUCE SCATTERED SHOWERS OVER AREA TODAY...
ESPECIALLY EASTERN TWO THIRDS WHERE MOISTURE WILL BE DEEPEST. DUE
TO COLD POOL AND GOOD MID LEVEL CAA...STEEP LAPSE RATES EXPECTED
AND SMALL CAPE VALUES PROGGD SO MENTIONED SLGHT CHC OF THUNDER
FOR MOST AREAS AS WELL THIS AFTN.
AFTER A SOMEWHAT LULL THIS EVENING ANOTHER LOBE OF ENERGY ROTATES
THROUGH LATE TONIGHT INTO WEDNESDAY AFFECTING PRIMARILY THE
EASTERN HALF OF CWA. WILL STILL MENTION POSSIBLE MIX OF SNOW AS
850H TEMPS STILL PROGGD TO FLIRT WITH ZERO LINE OVER PLAINS LATE
TONIGHT.
HIGH PRESSURE WILL FINALLY TAKE OVER LATE WEDNESDAY NIGHT AND HAVE
JUST LINGERED A FEW SHOWERS OVER FAR EAST WEDNESDAY EVENING. TESAR
.LONG TERM...VALID FOR THU...FRI...SAT...SUN...MON...
ALL EXTENDED MODELS INCLUDING CANADIAN HAVE NOW TRENDED IN THE
SAME DIRECTION WITH PATTERN. UPPER RIDGING ON THU WILL PERSIST
INTO FRI AND KEEP STRONG SHORTWAVE N OF THE FORECAST AREA. THE
RIDGE WILL AMPLIFY OVER THE REGION SAT THROUGH MON. END RESULT
WILL BE A DRY AND SLIGHTLY WARMER THAN NORMAL PERIOD.
REMOVED ANY LINGERING POPS DURING THE PERIOD. ALSO RAISED TEMPS
THU CLOSER TO THE MAV AS AIRMASS WILL BE MODERATING DURING THE
DAY. ON FRI...COMBINATION OF 850 TEMPS IN THE TEENS AND DOWNSLOPE
FLOW WILL ALLOW TEMPS TO CLIMB INTO LOW TO MID 70S SO HAVE RAISED
MAXES TOWARD MEX GUIDANCE. SAT WILL BE A BIT COOLER THAN FRI AS
LOW LEVEL FLOW TURNS MORE TO THE NORTH SO MADE SMALL ADJUSTMENT TO
TEMPS. REMAINDER OF FORECAST WAS IN GOOD SHAPE. ARTHUR
&&
.AVIATION...
DISTURBANCES ALOFT WILL CONTINUE TO ROTATE THROUGH THE AREA TODAY
AND TONIGHT BRINGING SCATTERED RAIN SHOWERS AND MOUNTAIN SNOW
SHOWERS. LOCAL MVFR CONDITIONS WILL OCCUR WITH THE RAIN SHOWERS.
MVFR/IFR CONDITIONS WILL OCCUR WITH THE SNOW SHOWERS. EXPECT
OCCASIONAL MOUNTAIN OBSCURATION THROUGH THE PERIOD. ARTHUR
&&
.PRELIMINARY POINT TEMP/POPS...
TDY WED THU FRI SAT SUN MON
-------------------------------------------------------
BIL 055 035/057 038/067 043/072 043/069 044/070 045/072
3/T 32/W 00/B 00/B 00/B 00/B 00/B
LVM 052 030/058 030/066 040/070 038/067 037/068 038/070
2/W 22/W 00/B 00/B 00/B 00/B 00/B
HDN 054 035/055 037/068 043/076 042/070 042/070 040/072
3/T 33/W 00/B 00/B 00/B 00/B 00/B
MLS 056 035/056 037/066 043/072 043/069 044/070 044/071
4/T 43/W 00/B 00/B 00/B 00/B 00/B
4BQ 055 034/053 034/065 041/072 041/070 041/070 041/070
5/T 33/W 20/B 00/B 00/B 00/B 00/B
BHK 055 032/052 033/062 038/067 039/064 040/068 040/067
4/T 44/W 20/B 00/B 00/B 00/B 00/B
SHR 050 032/053 031/064 037/071 039/069 039/070 039/072
5/T 43/W 00/B 00/B 00/B 00/B 00/U
&&
.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...NONE.
WY...NONE.
&&
WEATHER.GOV/BILLINGS1 heavy snow. Local standard time, as filed.
9 inches 19SW Sheridan at Big Goose Snotel, 21S Dayton at Dome Lake Snotel, 12SSW Sheridan at Sucker Creek Snotel and 19SW Dayton at the Bone Springs Divide Snotel
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2006Every state in 2006This day in weather historyWarnings in Wyoming, May 2006
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: 5505409.