Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 754

May 7, 200519 counties in Nebraska; 19 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 7, 2005, 12:23 PM CDT for 19 counties in Nebraska; 19 counties in South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2005, 12:23 PM CDT (17:23 UTC)
Expired
May 7, 2005, 3:00 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
All 38 counties

Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Garfield County, NE, Gosper County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Aurora County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Douglas County, SD, Gregory County, SD, Haakon County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 62 km from the middle of the area, began a volume at 17:23 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 5.4 hours before the alert went out and 149 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, N. Platte/Lee Bi, NE at 12:00Z on 2005-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 joules per kilogram.LCLLFCEL10008507005003002001001 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, N. Platte/Lee Bi, NE at 12:00Z on 2005-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -119 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
36 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
1695 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-119 m²/s²
0-3 km storm-relative helicity
-147 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
May 6, 8:56 PM CDTMesoscale DiscussionSPCArthur, Blaine, Brown, Buffalo, Cherry, Custer and 14 more94 min
May 7, 1:15 PM CDTMesoscale DiscussionSPCFranklin, Frontier, Furnas, Gosper, Harlan, Kearney and 3 more3 hr
May 7, 1:50 PM CDTSevere Thunderstorm WatchSPCAdams, Blaine, Boyd, Brown, Buffalo, Cherry and 29 more7 hr
May 7, 5:02 PM CDTMesoscale DiscussionSPCBurt, Butler, Cass, Cedar, Colfax, Cuming and 19 more118 min
May 7, 5:32 PM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 36 more118 min
May 6, 11:36 PM CDTMesoscale DiscussionSPCLincoln, Minnehaha54 min
May 7, 3:25 PM CDTMesoscale DiscussionSPCBrown, Campbell, Corson, Dewey, Edmunds, Faulk and 4 more2 hr
May 7, 4:40 PM CDTSevere Thunderstorm WatchSPCCampbell, Corson, Dewey, Edmunds, Faulk, Hand and 5 more5 hr
May 7, 6:47 PM CDTMesoscale DiscussionSPCBrown, Campbell, Edmunds, Faulk, McPherson, Walworth118 min

Nearby

Mesoscale Discussions in Nebraska, 2005Mesoscale Discussions in South Dakota, 2005Every mesoscale discussion in 2005

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.