Alert archive / Idaho / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 33, NWS Pocatello, ID

August 19, 2020Clark County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Aug 19, 2020, 5:15 PM MDT for Clark County, Idaho. It was in force for 30 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 19, 2020, 5:15 PM MDT (23:15 UTC)
Expired: Aug 19, 2020, 5:45 PM MDT
In force: 30 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Clark County, ID

The radar

The Pocatello radar (KSFX), 134 km from the middle of the area, began a volume at 23:15 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

Boise Airport, ID (KBOI), launched 12:00Z, 11.3 hours before the alert went out and 318 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3029 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 238 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 Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 19, 2:18 PM MDT, 2 hours 57 minutes earlier.

Area forecast discussion, Aug 19, 2:18 PM MDT, 2 hours 57 minutes before

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In the hours before

Special weather statement, Aug 19, 4:45 PM MDT, 30 minutes before

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Special weather statement, Aug 19, 5:01 PM MDT, 14 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 10:46 PM MDT	Special Weather Statement	PIH	Bannock	29 min
Aug 19, 1:41 PM MDT	Red Flag Warning	PIH	Bingham, Blaine, Bonneville, Butte, Clark, Fremont and 7 more	31 hr
Aug 19, 4:45 PM MDT	Special Weather Statement	PIH	Oneida	45 min
Aug 19, 5:01 PM MDT	Special Weather Statement	PIH	Clark	44 min
Aug 19, 5:42 PM MDT	Special Weather Statement	PIH	Clark	33 min

Nearby

Severe Thunderstorm Warnings in Idaho, 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.