Alert archive / Washington / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 22, NWS Pendleton, OR

May 30, 2020Umatilla County, Oregon; Columbia County, Walla Walla County, Washington

NWS Pendleton, OR issued this severe thunderstorm warning at May 30, 2020, 7:53 PM PDT for Umatilla County, Oregon; Columbia County, Walla Walla County, Washington. It was in force for 29 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: May 30, 2020, 7:53 PM PDT (02:53 UTC)
Expired: May 30, 2020, 8:22 PM PDT
In force: 29 min
Issued by: NWS Pendleton, OR
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Umatilla County, OR, Columbia County, WA, Walla Walla County, WA

The radar

The Pendleton radar (KPDT), 54 km from the middle of the area, began a volume at 02:56 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.

The nearest sounding before it

Spokane, WA (KOTX), launched 00:00Z, 2.9 hours before the alert went out and 238 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: 124 J/kg
Mixed-layer CIN: -408 J/kg
Mixed-layer LCL: 2380 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 303 m²/s²
0-3 km storm-relative helicity: 350 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 Pendleton, OR wrote its last area forecast discussion before this severe thunderstorm warning went out at May 30, 4:49 PM PDT, 3 hours 4 minutes earlier.

Area forecast discussion, May 30, 4:49 PM PDT, 3 hours 4 minutes before

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In the hours before

Special weather statement, May 30, 4:39 PM PDT, 3 hours 14 minutes before

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Local storm report, May 30, 4:42 PM PDT, 3 hours 11 minutes before

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Special weather statement, May 30, 4:49 PM PDT, 3 hours 4 minutes before

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Local storm report, May 30, 4:51 PM PDT, 3 hours 2 minutes before

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Local storm report, May 30, 4:53 PM PDT, 3 hours before

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Local storm report, May 30, 4:56 PM PDT, 2 hours 57 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 5:10 PM PDT	Severe Thunderstorm Warning	PDT	Umatilla	65 min
May 31, 1:15 AM PDT	Severe Thunderstorm Warning	PDT	Union, Wallowa	60 min
May 31, 2:20 AM PDT	Special Weather Statement	PDT	Wallowa	55 min
May 31, 2:56 AM PDT	Special Weather Statement	PDT	Wallowa	64 min
May 30, 5:51 PM PDT	Special Weather Statement	PDT	Kittitas, Yakima	54 min
May 30, 6:14 PM PDT	Special Weather Statement	PDT	Walla Walla	31 min
May 30, 7:42 PM PDT	Special Weather Statement	PDT	Walla Walla	33 min

Nearby

Severe Thunderstorm Warnings in Washington, 2020 Severe Thunderstorm Warnings in Oregon, 2020 Every severe thunderstorm warning in 2020

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.