Alert archive / Washington / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 1, NWS Seattle, WA

September 5, 2013Grays Harbor County, Washington

NWS Seattle, WA issued this severe thunderstorm warning at Sep 5, 2013, 4:06 PM PDT for Grays Harbor County, Washington. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 5, 2013, 4:06 PM PDT (23:06 UTC)
Expired: Sep 5, 2013, 4:45 PM PDT
In force: 39 min
Issued by: NWS Seattle, WA
Area: Storm-based polygon

County Grays Harbor County, WA

The radar

The Langley Hill radar (KLGX), 21 km from the middle of the area, began a volume at 23:09 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

Salem/Mcnary, OR (KSLE), launched 12:00Z, 11.1 hours before the alert went out and 255 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: 135 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 503 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 35 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Seattle, WA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 5, 10:20 AM PDT, 5 hours 46 minutes earlier.

Area forecast discussion, Sep 5, 10:20 AM PDT, 5 hours 46 minutes before

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Hazardous weather outlook, Sep 5, 3:26 PM PDT, 40 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SEATTLE WA
326 PM PDT THU SEP 5 2013

WAZ001-503>519-060715-
SAN JUAN COUNTY-WESTERN WHATCOM COUNTY-SOUTHWEST INTERIOR-
EAST PUGET SOUND LOWLANDS-WESTERN SKAGIT COUNTY-EVERETT AND VICINITY-
SEATTLE/BREMERTON AREA-TACOMA AREA-ADMIRALTY INLET AREA-
HOOD CANAL AREA-LOWER CHEHALIS VALLEY AREA-OLYMPICS-
EASTERN STRAIT OF JUAN DE FUCA-WESTERN STRAIT OF JUAN DE FUCA-
NORTH COAST-CENTRAL COAST-WEST SLOPES NORTHERN CASCADES AND PASSES-
WEST SLOPES CENTRAL CASCADES AND PASSES-
326 PM PDT THU SEP 5 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MUCH OF WESTERN WASHINGTON.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PERIODS OF HEAVY RAIN IS EXPECTED OVER MUCH OF THE INTERIOR...
ESPECIALLY EAST OF THE OLYMPIC RANGE THROUGH TONIGHT. LOCAL
RAINFALL AMOUNTS OF 1 TO 2 INCHES IS POSSIBLE. THE HEAVY RAIN
COULD LEAD TO URBAN AND SMALL STREAM FLOODING AS WELL AS MUD OR
ROCK SLIDES IN STEEP MOUNTAINOUS TERRAIN.

THUNDERSTORMS WILL HAVE THE POTENTIAL TO PRODUCE INTENSE RAINFALL
IN A SHORT PERIOD ANYWHERE ACROSS WESTERN WASHINGTON. A FEW OF THE
STORMS COULD ALSO PRODUCE HAIL AND STRONG WINDS IN THE CENTRAL
CASCADES THROUGH THIS EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY
THE POTENTIAL FOR HEAVY RAIN WILL CONTINUE OVER THE INTERIOR
THROUGH FRIDAY AFTERNOON. ADDITIONAL RAINFALL AMOUNTS OF ABOUT
A HALF TO ONE INCH...WITH LOCALLY HIGHER AMOUNTS...CAN BE EXPECTED
DURING THE DAY FRIDAY OVER THE INTERIOR. THE PROBABILITY FOR
WIDESPREAD HAZARDOUS WEATHER WILL BECOME LOW FRIDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...
WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
ACCORDING TO STANDARD OPERATING PROCEDURES.

WWW.WEATHER.GOV/SEATTLE

In the hours before

Special weather statement, Sep 5, 2:59 PM PDT, 1 hour 7 minutes before

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Special weather statement, Sep 5, 3:13 PM PDT, 53 minutes before

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Special weather statement, Sep 5, 3:51 PM PDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SEATTLE WA
351 PM PDT THU SEP 5 2013

WAZ512-052330-
LOWER CHEHALIS VALLEY AREA-
351 PM PDT THU SEP 5 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GRAYS HARBOR COUNTY
UNTIL 430 PM PDT...

AT 342 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 11 MILES EAST OF MONTESANO...OR 21 MILES
SOUTHWEST OF SHELTON...MOVING WEST AT 15 MPH.

SMALL PEA SIZED HAIL IS POSSIBLE WITH THIS STORM...ALONG WITH HEAVY
RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  MONTESANO...
  ELMA...
  SATSOP...
  MELBOURNE...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 4689 12372 4716 12356 4708 12351 4703 12321
      4679 12329
TIME...MOT...LOC 2249Z 108DEG 12KT 4698 12340

WWW.WEATHER.GOV/SEATTLE

Special weather statement, Sep 5, 4:04 PM PDT, 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SEATTLE WA
404 PM PDT THU SEP 5 2013

WAZ505-509-519-060000-
EAST PUGET SOUND LOWLANDS-TACOMA AREA-WEST SLOPES CENTRAL CASCADES
AND PASSES-
404 PM PDT THU SEP 5 2013

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN PIERCE COUNTY UNTIL 500
PM PDT...

AT 358 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR GRAHAM...OR 13 MILES NORTH OF ALDER...MOVING
NORTHWEST AT 20 MPH.

HAIL UP TO THE SIZE OF PENNIES IS LIKELY WITH THIS STORM...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  SUMMIT...
  EDGEWOOD-NORTH HILL...
  FORT LEWIS...
  TACOMA...
  GRAHAM...

TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED
ROADWAY.

LAT...LON 4710 12269 4713 12268 4712 12271 4714 12268
      4713 12267 4716 12265 4731 12239 4726 12233
      4725 12229 4697 12198 4683 12220
TIME...MOT...LOC 2302Z 137DEG 18KT 4700 12232

WWW.WEATHER.GOV/SEATTLE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 8:52 AM PDT	Small Craft Advisory	SEW		26 hr
Sep 5, 2:59 PM PDT	Special Weather Statement	SEW	Lewis	91 min
Sep 5, 3:13 PM PDT	Special Weather Statement	SEW	Pierce	92 min
Sep 5, 3:51 PM PDT	Special Weather Statement	SEW	Grays Harbor	39 min
Sep 5, 4:04 PM PDT	Special Weather Statement	SEW	Pierce	56 min
Sep 5, 4:46 PM PDT	Special Weather Statement	SEW	Pierce	59 min
Sep 5, 4:49 PM PDT	Special Weather Statement	SEW	Grays Harbor	56 min

Nearby

Severe Thunderstorm Warnings in Washington, 2013 Every severe thunderstorm warning in 2013

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.