Alert archive / Washington / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 14, NWS Spokane, WA

May 31, 2015Asotin County, Garfield County, Washington

NWS Spokane, WA issued this severe thunderstorm warning at May 31, 2015, 8:54 PM PDT for Asotin County, Garfield County, Washington. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 31, 2015, 8:54 PM PDT (03:54 UTC)
Expired: May 31, 2015, 9:30 PM PDT
In force: 36 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

Counties Asotin County, WA, Garfield County, WA

The radar

The Pendleton radar (KPDT), 121 km from the middle of the area, began a volume at 03:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 3.9 hours before the alert went out and 174 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3012 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

971 
WUUS56 KOTX 010354
SVROTX
WAC003-023-010430-
/O.NEW.KOTX.SV.W.0014.150601T0354Z-150601T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPOKANE WA
854 PM PDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GARFIELD COUNTY IN SOUTHEASTERN WASHINGTON...
  NORTHWESTERN ASOTIN COUNTY IN SOUTHEASTERN WASHINGTON...

* UNTIL 930 PM PDT

* AT 849 PM PDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 13 MILES
  SOUTHWEST OF DELANEY TO 10 MILES SOUTHEAST OF DAYTON TO 10 MILES
  SOUTHEAST OF SKI BLUEWOOD...AND MOVING NORTHEAST AT 40 MPH. NICKEL
  SIZE HAIL MAY ALSO ACCOMPANY THE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...  
  PEOLA...POMEROY...DODGE...ALDER THICKET CAMPGROUND...SPRUCE SPRINGS
  CAMPGROUND...HIGHWAY 12.  

THOSE ATTENDING OUTDOOR EVENTS THAT ARE IN THE PATH OF THESE STORMS 
SHOULD PREPARE FOR IMMINENT DANGEROUS WEATHER CONDITIONS. SEEK 
SHELTER NOW. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL. 
 
AREAS OF BLOWING DUST ARE EXPECTED NEAR AND AHEAD OF THE
THUNDERSTORMS. MOTORISTS CAN EXPECT POOR VISIBILITIES AND SHOULD
REDUCE SPEEDS ACCORDINGLY.

&&

LAT...LON 4633 11762 4634 11768 4638 11768 4640 11772
      4647 11774 4647 11786 4662 11785 4662 11780
      4667 11775 4655 11730 4621 11724 4600 11755
      4600 11759
TIME...MOT...LOC 0349Z 225DEG 35KT 4641 11822 4625 11777 4595 11774 

$$

BZ

1 follow-up statement

282 
WWUS56 KOTX 010415
SVSOTX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
915 PM PDT SUN MAY 31 2015

WAC003-023-010430-
/O.CON.KOTX.SV.W.0014.000000T0000Z-150601T0430Z/
GARFIELD WA-ASOTIN WA-
915 PM PDT SUN MAY 31 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM PDT
FOR GARFIELD AND NORTHWESTERN ASOTIN COUNTIES...

AT 910 PM PDT...DOPPLER RADAR SHOWED THE LINE OF STRONG THUNDERSTORM 
WINDS CROSSING INTO GARFIELD COUNTY. THESE STORMS ARE STILL CAPABLE 
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE 
LOCATED ALONG A LINE EXTENDING FROM NEAR DELANEY TO 6 MILES SOUTH OF 
POMEROY TO 10 MILES NORTHWEST OF TROY... MOVING NORTHEAST AT 40 MPH. 
NICKEL SIZE HAIL ALSO WILL ACCOMPANY THE DAMAGING WINDS.

LOCATIONS IMPACTED INCLUDE...
POMEROY...MISERY SPRING CAMPGROUND...DODGE...ALDER THICKET 
CAMPGROUND...WICKIUP CAMPGROUND...SPRUCE SPRING 
CAMPGROUND....PEOLA...AND HIGHWAY 12. 

THOSE ATTENDING OUTDOOR EVENTS THAT ARE IN THE PATH OF THESE STORMS 
SHOULD PREPARE FOR IMMINENT DANGEROUS WEATHER CONDITIONS. SEEK 
SHELTER NOW. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS HAVE A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
HAIL. THIS IS A VERY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A
STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.
 
&&

LAT...LON 4633 11762 4634 11768 4638 11768 4640 11772
      4647 11774 4647 11786 4662 11785 4662 11780
      4667 11775 4655 11730 4623 11727 4600 11755
      4600 11759
TIME...MOT...LOC 0409Z 225DEG 35KT 4653 11804 4637 11759 4607 11756 

$$

BZ

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at May 31, 7:57 PM PDT, 57 minutes earlier.

Area forecast discussion, May 31, 7:57 PM PDT, 57 minutes before

Area Forecast Discussion
National Weather Service Spokane WA
757 PM PDT SUN MAY 31 2015

.SYNOPSIS...
Thunderstorm chances this evening are expected to be more
confined to a small portion of southeast Washington and north
central Idaho. Thunderstorm chances will increase markedly Monday
and Tuesday as a strong upper level trough moves in from the
south. Some of the storms on Monday could be strong. Unsettled and
cooler weather will persist into the remainder of the work week
with a threat of showers and thunderstorms each day.

&&

.DISCUSSION...

Forecast updated to increase pops down south to account for the
thunderstorms moving northeast through Eastern Oregon that have
been moving through Southeast Washington and southern portions of
the North Idaho Panhandle. Have also inserted mention of areas of
blowing dusts as an outflow boundar ahead of a line of
thunderstorms moving through Northeast Oregon propagates out ahead
of the line of thunderstorms and has been lofting dust. Sustained
winds will show an increase and gusts could approach 55 mph along
this outflow boundary and the dust associated with it will lower
visibility in Southeast Washington and Southern Portions of the
North Idaho Panhandle. /Pelatti

&&

.AVIATION...
00Z TAFS: The atmosphere over the aviation area continues to
moisten with substantial destabilization and abundant triggering
mechanisms moving up from the south tonight and especially Monday
morning and through the day Monday. Of note are the thunderstorms
currently near KLWS and vicinity. This activity and additional
activity this evening are likely to impact that area over and
around KLWS with hail...heavy rain...infrequent lightning...and
gusty wind before subsiding close to 6Z Monday. As early as 12Z
Monday a strong front moves from south to north and is expected to
bring very powerful thunderstorms dropping hail and heavy rain
along with frequent lightning and very gusty wind over the
aviation area. Outflow boundaries from thunderstorms will loft
dust and lower visibilities as well. /Pelatti

&&

.PRELIMINARY POINT TEMPS/POPS...
Spokane        60  77  53  67  50  68 /  10  70  70  50  30  20
Coeur d'Alene  58  78  52  65  49  67 /  10  80  80  60  60  30
Pullman        56  73  49  64  47  66 /  50  70  60  60  40  20
Lewiston       64  82  54  70  52  73 /  60  80  60  60  50  20
Colville       57  81  55  68  51  70 /  10  80  90  80  60  40
Sandpoint      54  77  53  65  49  67 /  10  80 100  70  70  60
Kellogg        56  75  50  63  46  66 /  10  90  90  80  70  30
Moses Lake     63  83  54  72  52  75 /   0  70  40  40  20  20
Wenatchee      64  79  54  70  52  72 /  10  70  70  50  20  20
Omak           57  81  54  69  50  71 /   0  70  90  80  30  30

&&

.OTX WATCHES/WARNINGS/ADVISORIES...
ID...None.
WA...None.
&&

Hazardous weather outlook, May 31, 6:46 AM PDT, 14 hours 8 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE KOTX
646 AM PDT SUN MAY 31 2015

IDZ001-002-WAZ034>038-041>044-011400-
NORTHERN PANHANDLE-COEUR D'ALENE AREA-MOSES LAKE AREA-
UPPER COLUMBIA BASIN-SPOKANE AREA-NORTHEAST MOUNTAINS-
OKANOGAN HIGHLANDS-WENATCHEE AREA-EAST SLOPES NORTHERN CASCADES-
OKANOGAN VALLEY-WATERVILLE PLATEAU-
646 AM PDT SUN MAY 31 2015

This Hazardous Weather Outlook is for portions of North Idaho...
Central Washington...East Central Washington...North Central
Washington and Northeast Washington.

.DAY ONE...TODAY AND TONIGHT

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A low pressure system will bring a good chance for thunderstorms
across the region on Monday. Some storms could be strong to
severe producing large hail and damaging winds. Heavy rain is also
likely with these storms...increasing the risk of flash flooding
or debris flows, especially for areas located in steep terrain and
near wildfire burn scars.

IDZ003-004-026-027-WAZ031>033-011400-
IDAHO PALOUSE-CENTRAL PANHANDLE MOUNTAINS-LEWISTON AREA-
LEWIS AND SOUTHERN NEZ PERCE COUNTIES-NORTHEAST BLUE MOUNTAINS-
LOWER GARFIELD AND ASOTIN COUNTIES-WASHINGTON PALOUSE-
646 AM PDT SUN MAY 31 2015

This Hazardous Weather Outlook is for portions of North Idaho...
North Central Idaho and Southeast Washington.

.DAY ONE...TODAY AND TONIGHT

Afternoon thunderstorms are expected to develop over the higher
terrain in northeast Oregon this afternoon. Storm motion will be
to the northeast with developing thunderstorms possible for the
Northeast Blue Mountains over to the Central Panhandle Mountains.
This area will also includes the southern portion of the Palouse
down to the Camas Prairie. Some thunderstorms may become severe
with isolated large hail, damaging winds and heavy downpours all
potential hazards.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

A low pressure system will bring a good chance for thunderstorms
across the region on Monday. Some storms could be strong to
severe producing large hail and damaging winds. Heavy rain is also
likely with these storms...increasing the risk of flash flooding
or debris flows, especially for areas located in steep terrain.

In the hours before

Special weather statement, May 31, 5:11 PM PDT, 3 hours 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
511 PM PDT SUN MAY 31 2015

IDZ026-027-010115-
LEWIS AND SOUTHERN NEZ PERCE COUNTIES ID-LEWISTON AREA ID-
511 PM PDT SUN MAY 31 2015

...SPECIAL WEATHER STATEMENT...

AT 510 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
CRAIGMONT...OR 17 MILES SOUTHEAST OF LAPWAI...MOVING NORTHEAST AT 20
MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
KAMIAH...CRAIGMONT...NEZPERCE...PECK...REUBENS AND MOHLER.

LAT...LON 4631 11664 4650 11639 4641 11630 4641 11619
      4630 11613 4623 11601 4621 11605 4621 11615
      4615 11620 4620 11643 4615 11647 4615 11651
TIME...MOT...LOC 0010Z 239DEG 18KT 4627 11649

RP

Special weather statement, May 31, 5:11 PM PDT, 3 hours 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
511 PM PDT SUN MAY 31 2015

IDZ026-027-010115-
LEWIS AND SOUTHERN NEZ PERCE COUNTIES ID-LEWISTON AREA ID-
511 PM PDT SUN MAY 31 2015

...SPECIAL WEATHER STATEMENT...

AT 510 PM PDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
CRAIGMONT...OR 17 MILES SOUTHEAST OF LAPWAI...MOVING NORTHEAST AT 20
MPH.

THREE QUARTER INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
KAMIAH...CRAIGMONT...NEZPERCE...PECK...REUBENS AND MOHLER.

LAT...LON 4631 11664 4650 11639 4641 11630 4641 11619
      4630 11613 4623 11601 4621 11605 4621 11615
      4615 11620 4620 11643 4615 11647 4615 11651
TIME...MOT...LOC 0010Z 239DEG 18KT 4627 11649

RP

Local storm report, May 31, 6:44 PM PDT, 2 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
644 PM PDT SUN MAY 31 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     HAIL             CRAIGMONT               46.24N 116.47W
05/31/2015  E0.75 INCH       LEWIS              ID   PUBLIC

            FACEBOOK REPORT

&&

JWOLF

The office that day

Everything else NWS Spokane, WA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 31, 9:33 PM PDT	Severe Thunderstorm Warning	OTX	Asotin, Garfield, Whitman	57 min
May 31, 10:33 PM PDT	Severe Thunderstorm Warning	OTX	Asotin, Garfield, Whitman	42 min
Jun 1, 6:32 AM PDT	Flash Flood Watch	OTX	Adams, Chelan, Douglas, Ferry, Grant, Lincoln and 5 more	22 hr
Jun 1, 3:32 PM PDT	Special Weather Statement	OTX	Garfield	58 min
Jun 1, 4:07 PM PDT	Flash Flood Warning	OTX	Asotin, Garfield	3 hr
Jun 1, 4:18 PM PDT	Special Weather Statement	OTX	Asotin	42 min
Jun 1, 4:28 PM PDT	Areal Flood Advisory	OTX	Pend Oreille	2 hr
Jun 1, 4:44 PM PDT	Special Weather Statement	OTX	Chelan	61 min
Jun 1, 4:49 PM PDT	Special Weather Statement	OTX	Douglas	56 min

Nearby

Severe Thunderstorm Warnings in Washington, 2015 Every severe thunderstorm warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.