Alert archive / Colorado / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 499

June 20, 200426 counties in Colorado

The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 2004, 1:15 PM MDT for 26 counties in Colorado. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 2004, 1:15 PM MDT (19:15 UTC)
Expired
Jun 20, 2004, 8:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
All 26 counties

Adams County, CO, Arapahoe County, CO, Baca County, CO, Bent County, CO, Broomfield County, CO, Cheyenne County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Huerfano County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Pueblo County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO

The radar

The Denver radar (KFTG), 118 km from the middle of the area, began a volume at 19:17 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 20, 1:37 PM MDTTornado WarningPUBEl Paso53 min
Jun 20, 2:20 PM MDTSevere Thunderstorm WarningPUBBaca85 min
Jun 20, 2:33 PM MDTTornado WarningPUBEl Paso57 min
Jun 20, 3:02 PM MDTSevere Thunderstorm WarningBOULogan43 min
Jun 20, 3:05 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Weld40 min
Jun 20, 3:26 PM MDTSevere Thunderstorm WarningBOUMorgan64 min
Jun 20, 3:33 PM MDTSevere Thunderstorm WarningPUBEl Paso, Pueblo87 min
Jun 20, 3:44 PM MDTTornado WarningPUBEl Paso, Pueblo61 min
Jun 20, 3:46 PM MDTSevere Thunderstorm WarningPUBBaca89 min
Jun 20, 4:20 PM MDTTornado WarningPUBCrowley, Pueblo55 min
Jun 20, 4:33 PM MDTSevere Thunderstorm WarningPUBHuerfano57 min
Jun 20, 4:47 PM MDTSevere Thunderstorm WarningGLDYuma58 min
Jun 20, 4:56 PM MDTSevere Thunderstorm WarningPUBPueblo64 min
Jun 20, 5:07 PM MDTSevere Thunderstorm WarningPUBBent, Kiowa, Otero83 min
Jun 20, 5:16 PM MDTSevere Thunderstorm WarningPUBCrowley29 min
Jun 20, 5:22 PM MDTSevere Thunderstorm WarningPUBCrowley23 min
Jun 20, 5:54 PM MDTTornado WarningPUBBent66 min
Jun 20, 6:05 PM MDTSevere Thunderstorm WarningPUBProwers85 min
Jun 20, 6:34 PM MDTTornado WarningPUBProwers56 min
Jun 20, 7:29 PM MDTTornado WarningPUBProwers31 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.3 hours before the alert went out and 57 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 12:00Z on 2004-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 399 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 12:00Z on 2004-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
399 J/kg
Mixed-layer CIN
-219 J/kg
Mixed-layer LCL
795 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 12:48 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 9 more117 min
Jun 20, 2:19 PM MDTMesoscale DiscussionSPCGrand, Jackson, Larimer, Moffat, Routt116 min
Jun 20, 5:08 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 20 more2 hr

Nearby

Severe Thunderstorm Watches in Colorado, 2004Every severe thunderstorm watch 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.