Alert archive / Oregon / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 56, NWS Pendleton, OR

July 31, 1997Umatilla County, Union County, Oregon

NWS Pendleton, OR issued this severe thunderstorm warning at Jul 31, 1997, 3:15 PM PDT for Umatilla County, Union County, Oregon. It was in force for 45 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
Jul 31, 1997, 3:15 PM PDT (22:15 UTC)
Expired
Jul 31, 1997, 4:00 PM PDT
In force
45 min
Issued by
NWS Pendleton, OR
Area
Whole counties

Counties Umatilla County, OR, Union County, OR

The radar

The Pendleton radar (KPDT), 46 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 292 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, Spokane, WA at 12:00Z on 1997-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 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, Spokane, WA at 12:00Z on 1997-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 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
6 J/kg
Mixed-layer CIN
-263 J/kg
Mixed-layer LCL
1668 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
122 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jul 31, 2:07 PM PDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jul 31, 2:07 PM PDT, 1 hour 8 minutes before
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In the hours before

Local storm report, Jul 31, 12:50 PM PDT, 2 hours 25 minutes before
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Local storm report, Jul 31, 2:56 PM PDT, 19 minutes before
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  <link rel="stylesheet" href="index.css">
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        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.

IssuedProductOfficeCountiesLasted
Jul 30, 5:06 PM PDTSevere Thunderstorm WarningPDTUmatilla69 min
Jul 30, 5:29 PM PDTSevere Thunderstorm WarningPDTWasco2 hr
Jul 30, 6:05 PM PDTSevere Thunderstorm WarningPDTUmatilla55 min
Jul 30, 6:41 PM PDTSevere Thunderstorm WarningPDTMorrow, Umatilla64 min
Jul 30, 7:22 PM PDTSevere Thunderstorm WarningPDTWasco68 min
Jul 30, 7:49 PM PDTSevere Thunderstorm WarningPDTMorrow, Umatilla56 min
Jul 30, 8:30 PM PDTFlash Flood WarningPDTMorrow, Umatilla60 min
Jul 30, 9:24 PM PDTFlash Flood WarningPDTMorrow, Umatilla96 min
Jul 31, 2:50 PM PDTSevere Thunderstorm WarningPDTCrook, Deschutes40 min
Jul 31, 3:30 PM PDTSevere Thunderstorm WarningPDTCrook, Jefferson60 min
Jul 31, 4:00 PM PDTSevere Thunderstorm WarningPDTUmatilla, Union60 min
Jul 30, 6:54 PM PDTSevere Thunderstorm WarningPDTColumbia, Walla Walla51 min
Jul 30, 6:58 PM PDTSevere Thunderstorm WarningPDTColumbia, Walla Walla47 min
Jul 30, 8:55 PM PDTFlash Flood WarningPDTBenton, Franklin, Walla Walla2 hr
Jul 30, 9:38 PM PDTFlash Flood WarningPDTColumbia, Franklin, Walla Walla82 min
Jul 30, 9:38 PM PDTSevere Thunderstorm WarningPDTColumbia, Franklin, Walla Walla82 min

Nearby

Severe Thunderstorm Warnings in Oregon, 1997Every severe thunderstorm warning in 1997

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.