Alert archive / Colorado / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 45, NWS Denver/Boulder, CO

August 4, 2002Logan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 4, 2002, 6:09 PM MDT for Logan County, Colorado. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 4, 2002, 6:09 PM MDT (00:09 UTC)
Expired
Aug 4, 2002, 7:05 PM MDT
In force
56 min
Issued by
NWS Denver/Boulder, CO
Area
Counties, with a storm outline in the text

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 154 km from the middle of the area, began a volume at 00:12 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

Denver, CO (KDNR), launched 00:00Z, 0.2 hours before the alert went out and 112 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 2002-08-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 187 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2002-08-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 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
187 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1666 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

965 
WUUS55 KBOU 050009
SVRDEN
COC075-050105-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
605 PM MDT SUN AUG 4 2002

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN LOGAN COUNTY IN NORTHEAST COLORADO

* UNTIL 705 PM MDT

* AT 604 PM MDT...THE WEATHER SERVICE DOPPLER RADAR INDICATED A 
SEVERE THUNDERSTORM 3 MILES NORTHWEST OF PEETZ...OR ABOUT 15 MILES 
SOUTHWEST OF SIDNEY...MOVING SOUTHEAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...CROOK...
ILIFF...PADRONI...PEETZ...PROCTOR AND TWIN BUTTES.

HAIL UP TO ONE AND A HALF INCH IN DIAMETER AND VERY HEAVY RAIN ARE 
POSSIBLE WITH THIS SEVERE THUNDERSTORM.  A WEATHER SPOTTER 6 MILES 
NORTHWEST OF PEETZ REPORTED EXTREMELY HEAVY RAINFALL WHICH WAS 
REDUCING VISIBILITIES TO LESS THAN A FEW FEET.

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 4100 10331 4062 10311 4071 10266 4100 10266
BAKER

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 4, 7:11 PM MDTSevere Thunderstorm WarningBOULogan54 min
Aug 4, 7:42 PM MDTFlash Flood WarningBOULogan3 hr
Aug 4, 8:54 PM MDTSevere Thunderstorm WarningBOUSedgwick51 min
Aug 4, 9:58 PM MDTFlash Flood WarningBOUSedgwick3 hr
Aug 5, 2:40 PM MDTFlash Flood WarningBOUJefferson, Park3 hr
Aug 5, 3:12 PM MDTSevere Thunderstorm WarningBOUAdams, Denver48 min
Aug 5, 3:31 PM MDTFlash Flood WarningBOUAdams, Denver2 hr
Aug 5, 4:50 PM MDTSevere Thunderstorm WarningBOUArapahoe, Denver, Jefferson40 min
Aug 5, 4:50 PM MDTSevere Thunderstorm WarningBOUMorgan55 min
Aug 5, 5:01 PM MDTSevere Thunderstorm WarningBOUWeld59 min
Aug 5, 5:48 PM MDTFlash Flood WarningBOULarimer117 min
Aug 5, 5:49 PM MDTSevere Thunderstorm WarningBOUWeld56 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2002Every severe thunderstorm warning in 2002

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.