Alert archive / Colorado / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 63, NWS Denver/Boulder, CO

July 12, 2000Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 12, 2000, 5:37 PM MDT for Weld County, Colorado. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jul 12, 2000, 5:37 PM MDT (23:37 UTC)
Expired
Jul 12, 2000, 6:15 PM MDT
In force
38 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 80 km from the middle of the area, began a volume at 23:37 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
Jul 12, 2:15 PM MDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.6 hours before the alert went out and 130 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 2000-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 40 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 12:00Z on 2000-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
40 J/kg
Mixed-layer CIN
-362 J/kg
Mixed-layer LCL
1871 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KBOU 122342 COR
SVRDEN
COC123-130015-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO...CORRECTED
537 PM MDT WED JUL 12 2000

.ADDED A LOCATION IN THE WARNING AREA.

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

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

* UNTIL 615 PM MDT

* AT 537 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME NORTHEASTERN WELD COUNTY...OR     
  ABOUT 41 MILES EAST OF CHEYENNE.  THE STORM WAS MOVING SOUTHEAST   
  AT 15 MPH.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...PAWNEE 
NATIONAL GRASSLANDS.

LARGE HAIL...INTENSE RAIN...UP TO 2 INCHES IN LESS THAN AN HOUR... 
AND STRONG DAMAGING WINDS ARE POSSIBLE WITH THIS STORM.  TAKE COVER 
IN A SUBSTANTIAL SHELTER UNTIL THE STORM PASSES.

LAT...LON 4099 10408 4083 10407 4083 10363 4100 10361

COOPER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 2:48 PM MDTSevere Thunderstorm WarningBOUMorgan, Washington42 min
Jul 12, 2:52 PM MDTSevere Thunderstorm WarningBOULogan53 min
Jul 12, 3:30 PM MDTFlash Flood WarningBOUMorgan90 min
Jul 12, 3:44 PM MDTSevere Thunderstorm WarningBOUMorgan46 min
Jul 12, 3:46 PM MDTSevere Thunderstorm WarningBOULogan44 min
Jul 12, 3:57 PM MDTSevere Thunderstorm WarningBOUMorgan48 min
Jul 12, 4:13 PM MDTTornado WarningBOUMorgan32 min
Jul 12, 4:25 PM MDTSevere Thunderstorm WarningBOULogan50 min
Jul 12, 4:43 PM MDTSevere Thunderstorm WarningBOUMorgan47 min
Jul 12, 4:48 PM MDTSevere Thunderstorm WarningBOUWeld42 min
Jul 12, 4:53 PM MDTTornado WarningBOUMorgan37 min
Jul 12, 5:04 PM MDTFlash Flood WarningBOUMorgan3 hr
Jul 12, 5:13 PM MDTSevere Thunderstorm WarningBOULogan47 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2000Every severe thunderstorm warning in 2000

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.