Alert archive / Idaho / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 7, NWS Boise, ID

May 6, 2018Valley County, Idaho

NWS Boise, ID issued this severe thunderstorm warning at May 6, 2018, 3:40 PM MDT for Valley County, Idaho. It was in force for 50 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, 3:40 PM MDT (21:40 UTC)
Expired: May 6, 2018, 4:30 PM MDT
In force: 50 min
Issued by: NWS Boise, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Valley County, ID

The radar

The Boise radar (KCBX), 152 km from the middle of the area, began a volume at 21:42 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, 9.7 hours before the alert went out and 332 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: 1989 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 48 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, 48 minutes earlier.

Area forecast discussion, May 6, 2:52 PM MDT, 48 minutes before

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In the hours before

Special weather statement, May 6, 1:02 PM MDT, 2 hours 38 minutes before

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Special weather statement, May 6, 1:20 PM MDT, 2 hours 20 minutes before

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Special weather statement, May 6, 1:59 PM MDT, 1 hour 41 minutes before

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Special weather statement, May 6, 2:01 PM MDT, 1 hour 39 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, 1:59 PM MDT	Special Weather Statement	BOI		61 min
May 6, 5:27 PM MDT	Special Weather Statement	BOI	Elmore	33 min
May 5, 7:00 PM MDT	Special Weather Statement	BOI	Baker	30 min
May 5, 7:11 PM MDT	Severe Thunderstorm Warning	BOI	Baker	34 min
May 6, 1:02 PM MDT	Special Weather Statement	BOI	Baker	28 min
May 6, 1:20 PM MDT	Special Weather Statement	BOI	Baker	40 min
May 6, 2:01 PM MDT	Special Weather Statement	BOI	Baker	44 min
May 6, 2:08 PM MDT	Severe Thunderstorm Warning	BOI	Baker, Malheur	52 min
May 6, 2:12 PM MDT	Severe Thunderstorm Warning	BOI	Harney	20 min
May 6, 2:43 PM MDT	Severe Thunderstorm Warning	BOI	Harney	22 min
May 6, 2:54 PM MDT	Severe Thunderstorm Warning	BOI	Baker	36 min
May 6, 5:38 PM MDT	Special Weather Statement	BOI	Baker	37 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.