Alert archive / Washington / Heat Advisories in 2015

Heat Advisory 4, NWS Spokane, WA

August 11, 20154 counties in Washington; 4 counties in Idaho

NWS Spokane, WA issued this heat advisory at Aug 11, 2015, 3:37 PM PDT for 4 counties in Washington; 4 counties in Idaho. It took effect at Aug 12, 2015, 12:00 PM PDT. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued
Aug 11, 2015, 3:37 PM PDT (22:37 UTC)
In effect from
Aug 12, 2015, 12:00 PM PDT
Expired
Aug 13, 2015, 8:00 PM PDT
In force
32 hr
Issued by
NWS Spokane, WA

Counties Benewah County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Asotin County, WA, Garfield County, WA, Spokane County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 116 km from the middle of the area, began a volume at 22:37 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.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 12:00Z, 10.6 hours before the alert went out and 356 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-pSkew-T log-p diagram, Boise Airport, ID at 12:00Z on 2015-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Boise Airport, ID at 12:00Z on 2015-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 110 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
8 J/kg
Mixed-layer CIN
-593 J/kg
Mixed-layer LCL
2789 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
110 m²/s²
0-3 km storm-relative helicity
235 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Aug 11, 2:57 PM PDT, 40 minutes earlier.

Area forecast discussion, Aug 11, 2:57 PM PDT, 40 minutes before
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Hazardous weather outlook, Aug 11, 5:32 AM PDT, 10 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SPOKANE WA
532 AM PDT TUE AUG 11 2015

WAZ041>043-121430-
WENATCHEE AREA-EAST SLOPES NORTHERN CASCADES-OKANOGAN VALLEY-
532 AM PDT TUE AUG 11 2015

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

.DAY ONE...TODAY AND TONIGHT

Isolated thunderstorms are expected...mainly over the mountains.
Any lightning from these storms could result in new wild fires.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A low pressure system will set up just offshore the Northwest
region through the work week. This will result in an unstable
weather pattern across the Inland Northwest with thunderstorms
possible each day. Wettest and strongest thunderstorms are
expected on Thursday and Friday. This will increase the potential
for flash flooding and debris flows for areas in and near recent
burn scars. Other potential hazard with thunderstorms this week
will include gusty outflow winds and new fire starts from
lightning strikes.

IDZ001>004-026-027-WAZ031>038-044-121430-
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-WATERVILLE PLATEAU-
532 AM PDT TUE AUG 11 2015

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

Isolated thunderstorms are expected...mainly over the mountains.
Any lightning from these storms could result in new wild fires.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

There will be a chance for thunderstorms Wednesday, mainly over
the mountains. Wednesday will also be hot with high temperatures
warming into the upper 90s to around 100 degrees. Low pressure
will move over the region on Thursday and Friday with strong
thunderstorms possible over many areas.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 5:53 PM PDTFlash Flood WarningOTXShoshone3 hr
Aug 10, 6:24 PM PDTSpecial Weather StatementOTXShoshone36 min
Aug 10, 9:27 PM PDTSevere Thunderstorm WarningOTXBonner, Boundary48 min

Nearby

Heat Advisories in Washington, 2015Heat Advisories in Idaho, 2015Every heat advisory 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.