Alert archive / Nebraska / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 615

July 23, 2001Phillips County, Sedgwick County, Colorado; 19 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2001, 3:45 PM MDT for Phillips County, Sedgwick County, Colorado; 19 counties in Nebraska. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jul 23, 2001, 3:45 PM MDT (21:45 UTC)
Expired: Jul 23, 2001, 8:00 PM MDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 21 counties

Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Custer County, NE, Dawson County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Thomas County, NE

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jul 23, 3:46 PM MDT	Tornado Warning	BOU	Phillips, Sedgwick	29 min
Jul 23, 4:13 PM MDT	Tornado Warning	BOU	Phillips, Sedgwick	27 min
Jul 23, 4:19 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	56 min
Jul 23, 4:29 PM MDT	Severe Thunderstorm Warning	LBF	Logan	61 min
Jul 23, 4:43 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	62 min
Jul 23, 5:44 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	61 min
Jul 23, 7:00 PM MDT	Severe Thunderstorm Warning	LBF	Custer	60 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.8 hours before the alert went out and 76 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: 271 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: -16 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 23, 3:15 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	6 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2001 Severe Thunderstorm Watches in Colorado, 2001 Every severe thunderstorm watch in 2001

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.