Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 1660

July 13, 200416 counties in Nebraska; Gregory County, Todd County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2004, 11:52 PM CDT for 16 counties in Nebraska; Gregory County, Todd County, South Dakota. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2004, 11:52 PM CDT (04:52 UTC)
Expired: Jul 14, 2004, 1:15 AM CDT
In force: 83 min
Issued by: the Storm Prediction Center

Counties Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Thomas County, NE, Valley County, NE, Wheeler County, NE, Gregory County, SD, Todd County, SD

The radar

The North Platte radar (KLNX), 59 km from the middle of the area, began a volume at 04:54 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, 4.9 hours before the alert went out and 147 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: 4675 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1372 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 245 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 17.4

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 13, 7:15 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 9 more	90 min
Jul 13, 9:51 PM CDT	Mesoscale Discussion	SPC	Box Butte, Cherry, Dawes, Hooker, Sheridan, Sioux	84 min
Jul 14, 4:53 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Cherry, Cheyenne, Dawes and 8 more	2 hr
Jul 14, 5:35 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more	5 hr

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.