Alert archive / Washington / Wind Advisories in 2017

Wind Advisory 9, NWS Seattle, WA

February 15, 2017San Juan County, Washington

NWS Seattle, WA issued this wind advisory at Feb 15, 2017, 2:34 AM PST for San Juan County, Washington. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Feb 15, 2017, 2:34 AM PST (10:34 UTC)
Expired
Feb 15, 2017, 10:00 AM PST
In force
7 hr
Issued by
NWS Seattle, WA

County San Juan County, WA

The radar

The Seattle radar (KATX), 54 km from the middle of the area, began a volume at 10:35 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

Quillayute State, WA (KUIL), launched 00:00Z, 10.6 hours before the alert went out and 127 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, Quillayute State, WA at 00:00Z on 2017-02-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Quillayute State, WA at 00:00Z on 2017-02-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 358 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2505 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
358 m²/s²
0-3 km storm-relative helicity
468 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

975 
WWUS76 KSEW 151034
NPWSEW

URGENT - WEATHER MESSAGE
National Weather Service Seattle WA
234 AM PST Wed Feb 15 2017

WAZ001-503-506-510-151800-
/O.NEW.KSEW.WI.Y.0009.170215T1034Z-170215T1800Z/
San Juan County-Western Whatcom County-Western Skagit County-
Admiralty Inlet Area-
234 AM PST Wed Feb 15 2017

...WIND ADVISORY IN EFFECT UNTIL 10 AM PST THIS MORNING...

The National Weather Service in Seattle has issued a Wind
Advisory...which is in effect until 10 AM PST this morning. 

* WIND...South to southeast wind 20 to 35 mph with gusts to 55 mph.

* TIMING...Winds will peak early this morning then ease by the
  afternoon. 

* IMPACTS...Local power outages and downed tree limbs possible. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that winds of 35 mph are expected. Winds
this strong can make driving difficult...especially for high
profile vehicles. Use extra caution.

&&

$$

www.weather.gov/seattle

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 14, 8:01 PM PSTFreezing Rain AdvisorySEW16 hr
Feb 15, 2:51 AM PSTGale WarningSEW28 hr
Feb 15, 11:10 AM PSTFlood WatchSEWWhatcom23 hr
Feb 15, 2:32 PM PSTWind AdvisorySEWSan Juan16 hr

Nearby

Wind Advisories in Washington, 2017Every wind advisory in 2017

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.