Alert archive / Idaho / Winter Storm Warnings in 2015

Winter Storm Warning 4, NWS Boise, ID

December 16, 20154 counties in Idaho; Baker County, Harney County, Malheur County, Oregon

NWS Boise, ID issued this winter storm warning at Dec 16, 2015, 2:17 PM MST for 4 counties in Idaho; Baker County, Harney County, Malheur County, Oregon. It took effect at Dec 17, 2015, 5:00 AM MST. It was in force for 48 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 16, 2015, 2:17 PM MST (21:17 UTC)
In effect from: Dec 17, 2015, 5:00 AM MST
Expired: Dec 19, 2015, 5:00 AM MST
In force: 48 hr
Issued by: NWS Boise, ID

Counties Adams County, ID, Gem County, ID, Valley County, ID, Washington County, ID, Baker County, OR, Harney County, OR, Malheur County, OR

The radar

The Boise radar (KCBX), 100 km from the middle of the area, began a volume at 21:17 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, 9.3 hours before the alert went out and 397 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: 548 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 57 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 winter storm 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 winter storm warning went out at Dec 16, 9:30 AM MST, 4 hours 47 minutes earlier.

Area forecast discussion, Dec 16, 9:30 AM MST, 4 hours 47 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
Dec 16, 2:17 PM MST	Winter Weather Advisory	BOI	Ada, Adams, Boise, Camas, Canyon, Elmore and 8 more	37 hr

Nearby

Winter Storm Warnings in Idaho, 2015 Winter Storm Warnings in Oregon, 2015 Every winter storm warning in 2015

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.