Alert archive / Wyoming / Mesoscale Discussions in 2015

Mesoscale Discussion 1449

July 17, 20157 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2015, 3:45 PM MDT for 7 counties in Wyoming. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jul 17, 2015, 3:45 PM MDT (21:45 UTC)
Expired
Jul 17, 2015, 4:45 PM MDT
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
20%

Counties Albany County, WY, Carbon County, WY, Converse County, WY, Laramie County, WY, Natrona County, WY, Platte County, WY, Sweetwater County, WY

The radar

The Riverton/Lander radar (KRIW), 174 km from the middle of the area, began a volume at 21:45 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

Denver, CO (KDEN), launched 12:00Z, 9.8 hours before the alert went out and 389 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, Denver, CO at 12:00Z on 2015-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2015-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.1939Sfc1 km3 km6 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
3128 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
78 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
Jul 16, 7:09 PM MDTMesoscale DiscussionSPCSheridan96 min
Jul 17, 2:36 PM MDTMesoscale DiscussionSPCConverse, Goshen, Niobrara, Weston54 min
Jul 17, 3:03 PM MDTSevere Thunderstorm WatchSPCGoshen, Niobrara8 hr
Jul 17, 5:02 PM MDTMesoscale DiscussionSPCGoshen, Laramie, Niobrara, Platte118 min

Nearby

Mesoscale Discussions in Wyoming, 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.