Alert archive / Idaho / Mesoscale Discussions in 2015

Mesoscale Discussion 1680

August 14, 201510 counties in Idaho; Box Elder County, Utah

The Storm Prediction Center issued this mesoscale discussion at Aug 14, 2015, 1:12 PM MDT for 10 counties in Idaho; Box Elder County, Utah. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Aug 14, 2015, 1:12 PM MDT (19:12 UTC)
Expired
Aug 14, 2015, 3:45 PM MDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Bannock County, ID, Blaine County, ID, Cassia County, ID, Gooding County, ID, Jerome County, ID, Lincoln County, ID, Minidoka County, ID, Oneida County, ID, Power County, ID, Twin Falls County, ID, Box Elder County, UT

The radar

The Salt Lake City radar (KMTX), 143 km from the middle of the area, began a volume at 19:14 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

Elko, NV (KLKN), launched 12:00Z, 7.2 hours before the alert went out and 120 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, Elko, NV at 12:00Z on 2015-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Elko, NV at 12:00Z on 2015-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2135 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 14, 1:35 PM MDTMesoscale DiscussionSPCLemhi2 hr
Aug 14, 2:23 PM MDTSevere Thunderstorm WatchSPCLemhi7 hr

Nearby

Mesoscale Discussions in Idaho, 2015Mesoscale Discussions in Utah, 2015Every mesoscale discussion 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.