Alert archive / Nebraska / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 512

July 4, 20015 counties in Colorado; 11 counties in Nebraska; Laramie County, Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2001, 6:15 PM MDT for 5 counties in Colorado; 11 counties in Nebraska; Laramie County, Wyoming. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 4, 2001, 6:15 PM MDT (00:15 UTC)
Expired
Jul 4, 2001, 11:00 PM MDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Weld County, CO, Arthur County, NE, Banner County, NE, Chase County, NE, Cheyenne County, NE, Deuel County, NE, Dundy County, NE, Garden County, NE, Hayes County, NE, Keith County, NE, Kimball County, NE, Perkins County, NE, Laramie County, WY

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 4, 6:20 PM MDTSevere Thunderstorm WarningCYSKimball40 min
Jul 4, 6:36 PM MDTTornado WarningBOULogan, Weld39 min
Jul 4, 6:51 PM MDTTornado WarningLBFArthur54 min
Jul 4, 6:58 PM MDTSevere Thunderstorm WarningCYSBanner, Scotts Bluff32 min
Jul 4, 7:22 PM MDTSevere Thunderstorm WarningLBFKeith53 min
Jul 4, 7:29 PM MDTSevere Thunderstorm WarningCYSBanner46 min
Jul 4, 7:32 PM MDTSevere Thunderstorm WarningBOUWeld43 min
Jul 4, 8:13 PM MDTSevere Thunderstorm WarningLBFKeith62 min
Jul 4, 8:18 PM MDTSevere Thunderstorm WarningLBFChase, Perkins57 min
Jul 4, 8:50 PM MDTSevere Thunderstorm WarningLBFChase55 min
Jul 4, 9:04 PM MDTSevere Thunderstorm WarningGLDDundy41 min
Jul 4, 9:45 PM MDTSevere Thunderstorm WarningGLDDundy60 min

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.3 hours before the alert went out and 145 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 00:00Z on 2001-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 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, Denver, CO at 00:00Z on 2001-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939Sfc1 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
14 J/kg
Mixed-layer CIN
-97 J/kg
Mixed-layer LCL
4003 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
54 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.

IssuedProductOfficeCountiesLasted
Jul 4, 9:30 PM MDTSevere Thunderstorm WatchSPCYuma3 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Colorado, 2001Severe Thunderstorm Watches in Wyoming, 2001Every 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.