Cool, wet spring conditions across Eastern Washington during early June continued to saturate already unstable, liquefied soils over the Okanogan Highlands resulting in a landslide just east of the town of Tonasket.
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 OTX wrote it up.
Cool, wet spring conditions across Eastern Washington during early June continued to saturate already unstable, liquefied soils over the Okanogan Highlands resulting in a landslide just east of the town of Tonasket.
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 22, 4:16 PM PST, 3 hours 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SPOKANE WA 516 PM PDT WED JUN 22 2011 .SYNOPSIS... TODAY'S WARM WEATHER WILL BE ON THE OUT OVERNIGHT AS A STRONG COLD FRONT WILL USHER IN MUCH COOLER WEATHER FOR TOMORROW. AHEAD OF THIS FRONT...A CHANCE FOR RAIN SHOWERS AND ISOLATED THUNDERSTORMS WILL EXIST ACROSS FAR EASTERN WASHINGTON AND THE IDAHO PANHANDLE OVERNIGHT. EXPECT BREEZY CONDITIONS AND BELOW AVERAGE TEMPERATURES ON THURSDAY. UNSEASONABLY COOL...BUT MOSTLY DRY WEATHER WILL PERSIST INTO THE WEEKEND. TEMPERATURES WILL CLIMB BACK TO NEAR NORMAL BY EARLY NEXT WEEK. && .DISCUSSION... UPDATE...FORECAST UPDATE MADE TO ADJUST CLOUD COVER BASED ON CURRENT TRENDS AND SWITCH PRECIPITATION CHANCES FROM PROBABILITY TO COVERAGE WORDING (I.E. CHANCE TO ISOLATED/SCATTERED) FOR THIS EVENING. I ALSO ADDED THE MENTION OF HEAVY RAIN/SMALL HAIL/GUSTY WINDS TO THE SOUTHEAST CWA. SHOWERS AND T-STORMS HAVE BEEN DEVELOPING ABOUT NORTHEAST OREGON TO THE CAMAS PRAIRIE THIS AFTERNOON...IN THE DIFFLUENT NORTHEAST SIDE OF THE INCOMING UPPER TROUGH. STORM TOPS HAVE BEEN NEAR 25KFT-40KFT AND WITH STORM-TOP DIVERGENCE VALUES REACHING NEAR 60-90KTS. LAPS ANALYSIS INDICATES CAPES BETWEEN 1000-2000 J/KG ACROSS THIS REGION...WITH DEW POINTS IN THE LOWER TO MID-50S. 0-6KM SHEAR IS SUFFICIENT AT 35KTS TO SUSTAIN SOME STRONGER STORMS...WITH THE POTENTIAL FOR NEAR SEVERE STORMS WITH GUSTY WINDS AND HAIL OVER THE FAR SOUTHEAST CWA. THE SURFACE-BASED INSTABILITY WANES TOWARD 06Z WITH A STRENGTHENING INCREASE CIN PUTTING A CAP ON IT. HOWEVER THE INCOMING MID-LEVEL TROUGH/SHORTWAVE AND COLD FRONT COMING IN THROUGH THE OVERNIGHT WITH HAVE SOME ELEVATED INSTABILITY TO WORK WITH. GFS/NAM BOTH SHOW A RIBBON OF NEGATIVE DTHETA/DZ LAPSE RATES AND CAPE ACROSS THE EASTERN THIRD OF WASHINGTON AND NORTHERN IDAHO. THE DEEPEST ELEVATED INSTABILITY IS PLOTTED OVER THE SOUTHEAST CWA...FROM THE BLUES AND CAMAS PRAIRIE ONTO THE PALOUSE AND CENTRAL PANHANDLE. SO THE SHOWER AND THUNDERSTORM THREAT WILL EXPAND NORTH AND NORTHEASTWARD THROUGH THE NIGHT...TRANSITIONING TO ELEVATED CONVECTIVE THREAT. /JCOTE && .AVIATION... 00Z TAFS...VFR CONDITIONS ARE EXPECTED AT ALL TAF SITES THROUGH 00Z FRIDAY. THE MAIN WEATHER CONCERN THIS PERIOD WILL BE THE RISK OF -TSRA ACROSS SOUTHEASTERN WA AND THE ID PANHANDLE THIS EVENING. GUSTY WINDS WILL BE POSSIBLE NEAR STORMS...WHICH APPEAR MOST LIKELY TO IMPACT KLWS EARLY THIS EVENING...AND POSSIBLY KPUW LATE THIS EVENING. ADDITIONAL SHOWERS WILL DEVELOP LATE TONIGHT ACROSS EASTERN WA WHERE THERE WILL BE A SLIGHT CHANCE OF A -TSRA IMPACTING THE KGEG-KCOE CORRIDOR. STORMS WHICH FORM WILL BE HIGH BASED WITH MOST CIGS REMAINING ABOVE 7KFT. A FRONT WILL SWEEP THE REGION CLEAN OF ANY SHOWERS AND THUNDERSTORMS FROM WEST TO EAST LATE TONIGHT. EXPECT GUSTY WINDS OF 20-30KTS IN THE IN THE WAKE OF THE FRONT AT ALL TAF SITES BEGINNING TOMORROW MORNING. /NEUMAN && .PRELIMINARY POINT TEMPS/POPS... SPOKANE 55 67 43 65 45 68 / 30 20 0 0 0 0 COEUR D'ALENE 54 66 42 64 44 67 / 40 40 10 10 0 10 PULLMAN 52 64 42 63 42 66 / 50 30 0 0 0 0 LEWISTON 59 71 48 70 49 74 / 40 20 0 0 0 0 COLVILLE 53 72 43 69 42 73 / 10 30 20 20 10 20 SANDPOINT 54 67 42 63 42 66 / 50 50 10 10 10 20 KELLOGG 50 62 41 61 41 63 / 60 60 10 10 10 10 MOSES LAKE 54 74 46 73 46 75 / 0 0 0 10 10 0 WENATCHEE 57 70 50 71 50 74 / 0 0 0 10 10 0 OMAK 53 73 44 70 45 74 / 10 10 10 10 10 10 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...NONE. WA...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SPOKANE WA 601 AM PDT WED JUN 22 2011 IDZ001>004-026-027-WAZ031>038-041>044-231315- NORTHERN PANHANDLE-COEUR D'ALENE AREA-IDAHO PALOUSE- CENTRAL PANHANDLE MOUNTAINS-LEWISTON AREA- LEWIS AND SOUTHERN NEZ PERCE COUNTIES-NORTHEAST BLUE MOUNTAINS- LOWER GARFIELD AND ASOTIN COUNTIES-WASHINGTON PALOUSE- MOSES LAKE AREA-UPPER COLUMBIA BASIN-SPOKANE AREA- NORTHEAST MOUNTAINS-OKANOGAN HIGHLANDS-WENATCHEE AREA- EAST SLOPES NORTHERN CASCADES-OKANOGAN VALLEY-WATERVILLE PLATEAU- 601 AM PDT WED JUN 22 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH IDAHO... NORTH CENTRAL IDAHO...CENTRAL WASHINGTON...EAST CENTRAL WASHINGTON...NORTH CENTRAL WASHINGTON...NORTHEAST WASHINGTON AND SOUTHEAST WASHINGTON. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
415 PM PDT WED JUN 22 2011
IDZ027-230015-
LEWIS ID-NEZ PERCE ID-
415 PM PDT WED JUN 22 2011
THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
SOUTH CENTRAL NEZ PERCE COUNTY IN NORTH CENTRAL IDAHO
SOUTHWESTERN LEWIS COUNTY IN NORTH CENTRAL IDAHO
UNTIL 515 PM PDT
AT 412 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 26 MILES SOUTHWEST OF WINCHESTER..MOVING
NORTHEAST AT 25 MPH.
HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.
WEAK ROTATION WAS ALSO NOTED WITH THIS STORM.
LOCATIONS IMPACTED INCLUDE...
RURAL SOUTHERN NEZ PERCE COUNTY...
RURAL SOUTHWESTERN LEWIS COUNTY...
RURAL CENTRAL LEWIS COUNTY...
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
LAT...LON 4590 11686 4599 11690 4624 11651 4618 11644
4611 11650 4600 11651 4599 11654 4603 11664
4600 11663 4599 11671 4595 11675 4588 11673
4585 11680
TIME...MOT...LOC 2315Z 231DEG 20KT 4591 11682
FRIESSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
538 PM PDT WED JUN 22 2011
IDZ026-230115-
NEZ PERCE ID-
538 PM PDT WED JUN 22 2011
THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
NORTHEASTERN NEZ PERCE COUNTY IN NORTH CENTRAL IDAHO
UNTIL 615 PM PDT
AT 535 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 8 MILES EAST OF CULDESAC..MOVING NORTHEAST AT 25
MPH.
HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.
WEAK ROTATION WAS ALSO INDICTED ON NATIONAL WEATHER SERVICE DOPPLER
RADAR.
LOCATIONS IMPACTED INCLUDE...
LENORE...
PECK...
SOUTHWICK AND SPALDING...
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
LAT...LON 4638 11667 4663 11647 4663 11645 4651 11644
4649 11636 4647 11637 4646 11642 4642 11637
4637 11636 4634 11639 4635 11647 4632 11652
TIME...MOT...LOC 0038Z 212DEG 22KT 4641 11648
FRIESPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
604 PM PDT WED JUN 22 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0543 PM HAIL 3 SE GIFFORD 46.41N 116.50W
06/22/2011 M1.00 INCH NEZ PERCE ID TRAINED SPOTTER
SPOTTER NE25 SEVERAL 1 INCH HAILSTONES, MIXED WITH MARBLE
AND PEA-SIZED HAIL
&&
JCOTEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
824 PM PDT WED JUN 22 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0742 PM TSTM WND DMG 7 SSE ASOTIN 46.25N 116.99W
06/22/2011 ASOTIN WA TRAINED SPOTTER
TREE LIMBS 1 1/2 INCHES DOWN FROM THUNDERSTORM WINDS
0730 PM HAIL 5 E ANATONE 46.13N 117.02W
06/22/2011 E1.75 INCH ASOTIN WA PUBLIC
PUBLIC REPORT OF GOLF BALL SIZE HAIL OVER MONTGOMERY
RIDGE
&&
LNISBETThe national radar mosaic for the moment the first event began.
1 debris flow. Local standard time, as filed.
Cape LaBelle Road was closed at milepost 7.8 due to a mudslide. The exact time and size of the slide is unknown.
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: 317150.