A period of warm temperatures earlier in the month led to rapid rises on small streams as snow melt rapidly from mid and high elevations. High temperatures at low to mid elevations were in the upper 70s to low 80s June 4th through June 6th.
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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 OTX wrote it up.
A period of warm temperatures earlier in the month led to rapid rises on small streams as snow melt rapidly from mid and high elevations. High temperatures at low to mid elevations were in the upper 70s to low 80s June 4th through June 6th. Although temperatures cooled into the low 70s through June 10th, small streams continued to rise as snow melt from high elevations made its way into low elevation drainages. A wet storm system on June 8th exacerbated the situation with flows on small creeks and streams peaking by June 10th.
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 Spokane, WA wrote its last area forecast discussion before the first event at Jun 10, 7:12 AM PST, 2 hours 18 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SPOKANE WA
812 AM PDT FRI JUN 10 2011
.SYNOPSIS...
A WEAK STORM SYSTEM WILL MOVE ACROSS THE REGION TODAY BRINGING
SCATTERED SHOWERS AND A FEW THUNDERSTORMS. ANOTHER ROUND OF AFTERNOON
AND EVENING SHOWERS AND THUNDERSTORMS WILL LIKELY OCCUR ON
SATURDAY...MAINLY NORTH AND EAST OF SPOKANE. EXPECT A SIMILAR
SITUATION ON MONDAY. THE REMAINDER OF NEXT WEEK WILL SEE A THREAT
OF SHOWERS ACROSS THE NORTHERN MOUNTAINS WITH NEAR NORMAL
TEMPERATURES. THERE IS THE POTENTIAL FOR A COOL AND SHOWERY DAY ON
THURSDAY.
&&
.DISCUSSION...
THE FORECAST HAS BEEN UPDATED TO INCREASE POPS THIS MORNING IN THE
OKANOGAN VALLEY...AS WELL AS SLIGHT INCREASES FOR THE WATERVILLE
PLATEAU AND MOSES LAKE AREA. SATELLITE SHOWS A VORT MAX TRACKING
INTO OREGON WHERE THE BEST FORCING WILL LIE TODAY FOR SHOWERS AND
THUNDERSTORMS. HOWEVER THIS MORNING WEAK LIFT WITH THIS TROUGH
ALONG WITH MID LEVEL INSTABILITY HAS TRIGGERED A NARROW LINE OF
SHOWERS IN THE OKANOGAN VALLEY WITH OMAK THROUGH 8 AM ALREADY
REPORTING .16 INCHES OF RAIN. SOUTH OF THE OKANOGAN VALLEY SHOWERS
HAVE BEEN MORE SPOTTY BUT DID INCREASE POPS ABOUT 10 PCT FROM
PREVIOUS FORECAST FOR PLACES LIKE DOUGLAS AND MOSES LAKE. THE 12Z
NAM HAD A GENERAL HANDLE ON THIS SCENARIO AND SHOWS CONVECTION
TODAY BECOMING SURFACE BASED AND THIS BAND OF MID LEVEL ACTIVITY
WEAKENING DURING THE MORNING AS IT MOVES EAST. HOWEVER THESE
SHOWERS MAY PRIME THE LOWER LEVELS FOR INCREASED AFTERNOON SHOWER
ACTIVITY OVER NORTH CENTRAL AND NORTHEAST WASHINGTON SO WILL
EVALUATE THE AFTERNOON FORECAST AFTER ALL THE 12Z MODEL DATA
ARRIVES. JW
&&
.AVIATION...
12Z TAFS...WEAK WEATHER SYSTEM MOVING THOUGH THE REGION TODAY.
MID/HIGH CLOUDS WILL BE THE MAIN RESULT OF THIS SYSTEM THIS
MORNING. THIS AFTERNOON CONVECTIVE CLOUDS ARE EXPECTED TO DEVELOP
WITH BASES AROUND 5 KFT. SCATTERED SHOWERS WITH A FEW THUNDERSTORMS
ARE POSSIBLE THROUGH 03Z. THE CHANCES OF THUNDERSTORMS ARE FAIRLY
SLIM AND THUS ARE NOT MENTIONED IN THE TAFS. THREAT OF VFR SHOWERS
CONTINUES OVERNIGHT IN THE PANHANDLE AND EXTREME EASTERN WA. RJ
&&
.PRELIMINARY POINT TEMPS/POPS...
SPOKANE 67 51 66 47 71 48 / 20 30 40 40 10 10
COEUR D'ALENE 66 49 62 44 70 44 / 20 40 40 40 20 20
PULLMAN 65 48 65 42 69 44 / 20 30 30 30 10 10
LEWISTON 70 54 70 49 75 51 / 20 30 40 40 10 10
COLVILLE 72 49 71 48 76 48 / 20 40 60 60 20 20
SANDPOINT 66 48 62 45 69 45 / 20 40 60 60 30 30
KELLOGG 63 46 59 44 69 44 / 20 40 60 60 20 20
MOSES LAKE 74 50 75 47 77 49 / 20 20 10 10 10 10
WENATCHEE 73 54 72 51 76 53 / 20 20 10 10 10 10
OMAK 72 49 74 48 78 48 / 60 20 20 20 10 10
&&
.OTX WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
WA...FLOOD WATCH UNTIL 10 AM PDT THIS MORNING EAST SLOPES NORTHERN
CASCADES...OKANOGAN VALLEY.
&&The national radar mosaic for the moment the first event began.
1 flood, 1 debris flow. Local standard time, as filed.
Silver Falls Creek (near the upper end of the Entiat drainage) went out of its banks and flooded two camp sites at the Silver Falls Campground.
A mudslide was reported over upper Icicle Road about ten miles west of Leavenworth. The slide was about 200 yards wide and 10 to 12 feet deep. About 30 people were stranded at a campground above the slide. Some damage was reported to the road. Damage reported was estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2011Every state in 2011This day in weather historyWarnings in Washington, June 2011
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: 314503, 314552.