Alert archive / Colorado / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

April 29, 2003Morgan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 29, 2003, 6:40 PM MDT for Morgan County, Colorado. It was in force for 65 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
Apr 29, 2003, 6:40 PM MDT (00:40 UTC)
Expired
Apr 29, 2003, 7:45 PM MDT
In force
65 min
Issued by
NWS Denver/Boulder, CO
Area
Counties, with a storm outline in the text

County Morgan County, CO

The radar

The Denver radar (KFTG), 83 km from the middle of the area, began a volume at 00:42 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 29, 3:10 PM MDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.7 hours before the alert went out and 85 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 2003-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 537 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 2003-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
537 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1453 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

141 
WUUS55 KBOU 300040
SVRBOU
COC087-300145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
640 PM MDT TUE APR 29 2003

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MORGAN COUNTY IN NORTHEAST COLORADO
  THIS INCLUDES THE CITY OF FORT MORGAN

* UNTIL 745 PM MDT

* AT 640 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES WEST OF WIGGINS...OR ABOUT 18 MILES
  WEST OF FORT MORGAN...MOVING EAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...FORT
MORGAN...GOODRICH...JACKSON RESERVOIR...LOG LANE VILLAGE...ORCHARD...
WELDONA AND WIGGINS.

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

LAT...LON 4052 10414 4018 10414 4019 10369 4052 10376

GARD...WFO BOULDER

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 6:23 PM MDTSevere Thunderstorm WarningBOUWeld67 min
Apr 29, 6:29 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas, Elbert46 min
Apr 29, 6:42 PM MDTSevere Thunderstorm WarningBOUWeld48 min
Apr 29, 6:59 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe61 min
Apr 29, 7:05 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver, Douglas, Elbert55 min
Apr 29, 7:08 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver, Douglas, Elbert52 min
Apr 29, 7:16 PM MDTTornado WarningBOUMorgan44 min
Apr 29, 7:21 PM MDTSevere Thunderstorm WarningBOULogan, Weld54 min
Apr 29, 7:32 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert43 min
Apr 29, 8:00 PM MDTSevere Thunderstorm WarningBOUWashington60 min
Apr 29, 8:29 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert46 min
Apr 29, 9:01 PM MDTSevere Thunderstorm WarningBOUWashington29 min
Apr 29, 9:13 PM MDTSevere Thunderstorm WarningBOULincoln, Washington62 min
Apr 29, 9:16 PM MDTSevere Thunderstorm WarningBOUSedgwick44 min
Apr 29, 9:27 PM MDTTornado WarningBOUWashington48 min
Apr 30, 1:02 PM MDTSevere Thunderstorm WarningBOULincoln58 min
Apr 30, 1:18 PM MDTTornado WarningBOULincoln57 min
Apr 30, 2:12 PM MDTSevere Thunderstorm WarningBOULarimer33 min
Apr 30, 4:15 PM MDTTornado WarningBOUWeld60 min
Apr 30, 4:31 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver59 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2003Every severe thunderstorm warning in 2003

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.