Alert archive / Washington / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 14, NWS Spokane, WA

August 6, 2010Asotin County, Whitman County, Washington; Nez Perce County, Idaho

NWS Spokane, WA issued this severe thunderstorm warning at Aug 6, 2010, 2:53 PM PDT for Asotin County, Whitman County, Washington; Nez Perce County, Idaho. It was in force for 35 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: Aug 6, 2010, 2:53 PM PDT (21:53 UTC)
Expired: Aug 6, 2010, 3:28 PM PDT
In force: 35 min
Issued by: NWS Spokane, WA
Area: Storm-based polygon

Counties Nez Perce County, ID, Asotin County, WA, Whitman County, WA

The radar

The Spokane radar (KOTX), 139 km from the middle of the area, began a volume at 21:55 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

Spokane, WA (KOTX), launched 12:00Z, 9.9 hours before the alert went out and 148 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: 300 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 2136 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Spokane, WA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 6, 2:46 PM PDT, 7 minutes earlier.

Area forecast discussion, Aug 6, 2:46 PM PDT, 7 minutes before

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In the hours before

Special weather statement, Aug 6, 2:23 PM PDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPOKANE WA
223 PM PDT FRI AUG 6 2010

IDZ001-062230-
BOUNDARY ID-
223 PM PDT FRI AUG 6 2010

THE NATIONAL WEATHER SERVICE IN SPOKANE HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHERN BOUNDARY COUNTY IN THE PANHANDLE OF IDAHO

UNTIL 330 PM PDT

AT 220 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 15 MILES WEST OF COPELAND..MOVING EAST AT 15 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN.

LOCATIONS IMPACTED INCLUDE...
   PORTHILL...
   ROBINSON LAKE CAMPGROUND...

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 4894 11612 4888 11674 4899 11680 4901 11675
      4900 11617
TIME...MOT...LOC 2123Z 252DEG 14KT 4895 11668

SB

Local storm report, Aug 6, 2:44 PM PDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
244 PM PDT FRI AUG 06 2010

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

0242 PM     HAIL             7 SE ASOTIN             46.27N 116.94W
08/06/2010  E1.00 INCH       NEZ PERCE          ID   TRAINED SPOTTER

            SPOTTER ASOTIN 15,7SE ASOTIN

&&

SSAVOY

Local storm report, Aug 6, 2:45 PM PDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SPOKANE WA
245 PM PDT FRI AUG 06 2010

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

0234 PM     HAIL             9 S ASOTIN              46.21N 117.04W
08/06/2010  E1.50 INCH       ASOTIN             WA   PUBLIC

0242 PM     HAIL             7 SE ASOTIN             46.27N 116.94W
08/06/2010  E1.00 INCH       NEZ PERCE          ID   TRAINED SPOTTER

            SPOTTER ASOTIN 15,7SE ASOTIN

&&

JCOTE

Local storm report, Aug 6, 2:53 PM PDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 6:46 PM PDT	Special Weather Statement	OTX	Asotin	59 min
Aug 5, 6:54 PM PDT	Special Weather Statement	OTX	Chelan	51 min
Aug 6, 2:21 PM PDT	Severe Thunderstorm Warning	OTX	Asotin	39 min
Aug 6, 2:23 PM PDT	Special Weather Statement	OTX	Boundary	67 min
Aug 6, 2:45 PM PDT	Severe Thunderstorm Warning	OTX	Lewis, Nez Perce	18 min

Nearby

Severe Thunderstorm Warnings in Washington, 2010 Severe Thunderstorm Warnings in Idaho, 2010 Every severe thunderstorm warning in 2010

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.