Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1799

July 29, 200416 counties in Nebraska; 6 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2004, 8:16 PM MDT for 16 counties in Nebraska; 6 counties in South Dakota. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued: Jul 29, 2004, 8:16 PM MDT (02:16 UTC)
Expired: Jul 29, 2004, 8:45 PM MDT
In force: 29 min
Issued by: the Storm Prediction Center

All 22 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Wheeler County, NE, Bennett County, SD, Charles Mix County, SD, Gregory County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 89 km from the middle of the area, began a volume at 02:16 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.3 hours before the alert went out and 181 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: 53 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 2111 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 124 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.

Issued	Product	Office	Counties	Lasted
Jul 29, 7:10 PM MDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more	35 min
Jul 29, 6:16 PM MDT	Mesoscale Discussion	SPC	Bennett, Brule, Buffalo, Butte, Custer, Fall River and 17 more	59 min

Nearby

Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

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.