Alert archive / Colorado / Mesoscale Discussions in 2011

Mesoscale Discussion 1455

June 30, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2011, 4:17 PM MDT for 4 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2011, 4:17 PM MDT (22:17 UTC)
Expired
Jun 30, 2011, 6:15 PM MDT
In force
118 min
Issued by
the Storm Prediction Center
All 65 counties

Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Chaffee County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Eagle County, CO, El Paso County, CO, Elbert County, CO, Fremont County, CO, Gilpin County, CO, Grand County, CO, Gunnison County, CO, Jackson County, CO, Jefferson County, CO, Lake County, CO, Larimer County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Pitkin County, CO, Routt County, CO, Sedgwick County, CO, Summit County, CO, Teller County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Oglala Lakota County, SD, Todd County, SD, Albany County, WY, Carbon County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 72 km from the middle of the area, began a volume at 22:19 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.3 hours before the alert went out and 137 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 2011-06-30Temperature 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 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 2011-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 square meters per square second.193958Sfc1 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
2394 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
89 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
Jun 30, 8:51 AM MDTMesoscale DiscussionSPCDelta, Dolores, Eagle, Garfield, Gunnison, Hinsdale and 10 more54 min
Jun 30, 9:06 AM MDTSevere Thunderstorm WatchSPCDelta, Dolores, Eagle, Garfield, Gunnison, La Plata and 10 more7 hr
Jun 30, 11:57 AM MDTMesoscale DiscussionSPCAdams, Boulder, Broomfield, Chaffee, Clear Creek, Denver and 14 more63 min
Jun 30, 12:18 PM MDTSevere Thunderstorm WatchSPCAdams, Arapahoe, Boulder, Broomfield, Chaffee, Clear Creek and 17 more9 hr
Jun 30, 1:49 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Boulder, Broomfield, Clear Creek, Delta and 25 more116 min
Jun 30, 2:19 PM MDTMesoscale DiscussionSPCArthur, Cherry, Grant, Hooker, Keith, McPherson and 1 more56 min
Jun 30, 4:39 PM MDTSevere Thunderstorm WatchSPCArthur, Brown, Cherry, Deuel, Garden, Grant and 9 more5 hr

Nearby

Mesoscale Discussions in Colorado, 2011Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in South Dakota, 2011Every mesoscale discussion in 2011

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.