Alert archive / Idaho / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 9, NWS Boise, ID

May 6, 2018Payette County, Washington County, Idaho

NWS Boise, ID issued this severe thunderstorm warning at May 6, 2018, 6:59 PM MDT for Payette County, Washington County, Idaho. It was in force for 16 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 6, 2018, 6:59 PM MDT (00:59 UTC)
Expired: May 6, 2018, 7:15 PM MDT
In force: 16 min
Issued by: NWS Boise, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Payette County, ID, Washington County, ID

The radar

The Boise radar (KCBX), 93 km from the middle of the area, began a volume at 00:59 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, 1.0 hours before the alert went out and 387 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: 64 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 2534 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 79 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 Boise, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at May 6, 2:52 PM MDT, 4 hours 7 minutes earlier.

Area forecast discussion, May 6, 2:52 PM MDT, 4 hours 7 minutes before

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In the hours before

Special weather statement, May 6, 1:02 PM MDT, 5 hours 57 minutes before

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Special weather statement, May 6, 1:20 PM MDT, 5 hours 39 minutes before

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Special weather statement, May 6, 1:59 PM MDT, 5 hours before

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Special weather statement, May 6, 2:01 PM MDT, 4 hours 58 minutes before

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Special weather statement, May 6, 5:27 PM MDT, 1 hour 32 minutes before

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Special weather statement, May 6, 5:38 PM MDT, 1 hour 21 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 6:02 PM MDT	Special Weather Statement	BOI	Payette	28 min
May 6, 6:26 PM MDT	Severe Thunderstorm Warning	BOI	Payette, Washington	34 min
May 6, 7:50 PM MDT	Special Weather Statement	BOI	Adams	40 min
May 6, 8:09 PM MDT	Severe Thunderstorm Warning	BOI	Valley	23 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2018 Every severe thunderstorm warning in 2018

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.