Alert archive / Colorado / Tornado Watches in 2004

Tornado Watch 727

August 9, 200415 counties in Colorado

The Storm Prediction Center issued this tornado watch at Aug 9, 2004, 6:45 PM MDT for 15 counties in Colorado. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Aug 9, 2004, 6:45 PM MDT (00:45 UTC)
Expired
Aug 9, 2004, 11:00 PM MDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Adams County, CO, Arapahoe County, CO, Baca County, CO, Bent County, CO, Cheyenne County, CO, Crowley County, CO, El Paso County, CO, Elbert County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Otero County, CO, Prowers County, CO, Pueblo County, CO

The radar

The Pueblo radar (KPUX), 63 km from the middle of the area, began a volume at 00:45 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

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

IssuedProductOfficeCountiesLasted
Aug 9, 6:46 PM MDTTornado WarningBOULincoln, Washington44 min
Aug 9, 6:52 PM MDTTornado WarningBOUElbert38 min
Aug 9, 6:52 PM MDTFlash Flood WarningPUBPueblo113 min
Aug 9, 7:00 PM MDTTornado WarningPUBEl Paso60 min
Aug 9, 7:18 PM MDTSevere Thunderstorm WarningPUBCrowley87 min
Aug 9, 7:26 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln64 min
Aug 9, 7:31 PM MDTSevere Thunderstorm WarningPUBPueblo89 min
Aug 9, 7:32 PM MDTSevere Thunderstorm WarningGLDCheyenne58 min
Aug 9, 7:46 PM MDTSevere Thunderstorm WarningGLDKit Carson59 min
Aug 9, 7:59 PM MDTTornado WarningPUBEl Paso61 min
Aug 9, 8:27 PM MDTTornado WarningPUBCrowley, Pueblo63 min
Aug 9, 8:28 PM MDTSevere Thunderstorm WarningPUBKiowa92 min
Aug 9, 8:29 PM MDTSevere Thunderstorm WarningGLDCheyenne46 min
Aug 9, 8:31 PM MDTSevere Thunderstorm WarningBOULincoln29 min
Aug 9, 8:50 PM MDTSevere Thunderstorm WarningBOULincoln40 min
Aug 9, 9:00 PM MDTTornado WarningBOULincoln45 min
Aug 9, 9:05 PM MDTTornado WarningGLDCheyenne40 min
Aug 9, 9:41 PM MDTSevere Thunderstorm WarningPUBEl Paso64 min
Aug 9, 9:55 PM MDTSevere Thunderstorm WarningPUBLas Animas65 min
Aug 9, 10:11 PM MDTSevere Thunderstorm WarningPUBPueblo64 min
Aug 9, 10:23 PM MDTSevere Thunderstorm WarningPUBBaca67 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 00:00Z, 0.8 hours before the alert went out and 195 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 2004-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2151 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 00:00Z on 2004-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.193958Sfc1 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
2151 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1371 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
0.9
Supercell composite
10.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 100044
SEL7  
SPC WW 100045
COZ000-100500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 727
NWS STORM PREDICTION CENTER NORMAN OK
645 PM MDT MON AUG 9 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       EASTERN COLORADO

EFFECTIVE THIS MONDAY EVENING FROM 645 PM UNTIL 1100 PM MDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 50 MILES NORTH NORTHEAST OF LIMON COLORADO TO 60
MILES EAST SOUTHEAST OF TRINIDAD COLORADO.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 724. WATCH NUMBER 724 WILL NOT BE IN EFFECT AFTER 645
PM MDT. CONTINUE...WW 725...WW 726...

DISCUSSION...INTENSE SUPERCELLS WITH A THREAT OF VERY LARGE/DAMAGING
HAIL AND ISOLATED TORNADOES WILL CONTINUE FOR SEVERAL MORE HOURS
OVER ERN CO.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 31020.


...EVANS

395,1015 365,1015 365,1044 395,1044

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 9, 9:29 PM MDTMesoscale DiscussionSPCBent, Cheyenne, Crowley, Kiowa, Otero, Prowers61 min
Aug 10, 12:41 PM MDTMesoscale DiscussionSPCAdams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 15 more94 min
Aug 10, 1:15 PM MDTTornado WatchSPCAdams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 20 more8 hr

Nearby

Tornado Watches in Colorado, 2004Every tornado 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.