Alert archive / Colorado / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 23, NWS Denver/Boulder, CO

May 17, 2000Arapahoe County, Douglas County, Jefferson County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 17, 2000, 9:29 AM MDT for Arapahoe County, Douglas County, Jefferson County, Colorado. It was in force for 41 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
May 17, 2000, 9:29 AM MDT (15:29 UTC)
Expired
May 17, 2000, 10:10 AM MDT
In force
41 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Arapahoe County, CO, Douglas County, CO, Jefferson County, CO

The radar

The Denver radar (KFTG), 57 km from the middle of the area, began a volume at 15:28 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 12:00Z, 3.5 hours before the alert went out and 169 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 2000-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 439 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 2000-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.1939587897Sfc1 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
439 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
1040 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
205 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

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

839 
WUUS55 KBOU 171531
SVRDEN
COC001-005-031-035-059-171610-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
929 AM MDT WED MAY 17 2000

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN ADAMS COUNTY IN NORTHEAST COLORADO
  EXTREME WESTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
  DENVER COUNTY IN NORTHEAST COLORADO
  NORTHERN DOUGLAS COUNTY IN NORTHEAST COLORADO
  JEFFERSON COUNTY IN NORTHEAST COLORADO

* UNTIL 1010 AM MDT

* AT 927 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A SEVERE THUNDERSTORM 2 MILES WEST OF CHATFIELD RESERVOIR...OR ABOUT
  15 MILES SOUTHWEST OF DENVER...MOVING NORTHWEST AT 10 MPH.

* THE PUBLIC REPORTED HAIL ONE INCH IN DIAMETER AS OF 925 AM MDT AT 
  THE INTERSECTION OF COUNTY LINE ROAD AND SANTA FE IN LITTLETON.   

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...WHEAT
RIDGE...WESTMINSTER...THORNTON...NORTHGLENN...LITTLETON...LAKEWOOD...
GOLDEN...ENGLEWOOD...DENVER...COMMERCE CITY...AURORA...ARVADA...WHITE
RANCH OPEN SPACE...TINY TOWN...SURREY RIDGE...SPRUCEWOOD...SOUTH
PLATTE...SHERIDAN...SEDALIA...ROXBOROUGH PARK...ROCKY FLATS...RED
ROCKS PARK...PARKER...MORRISON...LOUVIERS...KITTREDGE...INDIAN
HILLS...IDLEDALE...HIGHLANDS RANCH...GREENWOOD VILLAGE...FRANKTOWN...
FEDERAL HEIGHTS...EVERGREEN...CONIFER...CHATFIELD RESERVOIR...CASTLE
ROCK...BEVERLY HILLS...BERGEN PARK AND ASPEN PARK.

HAIL UP TO 1 1/4 INCH IN DIAMETER...HEAVY RAIN AND EVEN A FUNNEL 
CLOUD ARE POSSSIBLE WITH THIS STORM. IF YOU ARE IN THE PATH OF THE 
STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER.

LAT...LON 3973 10538 3948 10535 3929 10521 3931 10471
          3990 10485 3990 10537
BAKER

The office that day

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

IssuedProductOfficeCountiesLasted
May 17, 9:03 AM MDTSevere Thunderstorm WarningBOUBoulder, Larimer27 min
May 17, 9:29 AM MDTSevere Thunderstorm WarningBOUAdams, Denver41 min
May 17, 10:32 AM MDTSevere Thunderstorm WarningBOUArapahoe, Denver, Jefferson43 min
May 17, 10:32 AM MDTSevere Thunderstorm WarningBOUDouglas43 min
May 17, 10:43 AM MDTSevere Thunderstorm WarningBOULarimer62 min
May 17, 12:19 PM MDTSevere Thunderstorm WarningBOUBoulder, Jefferson41 min
May 17, 12:19 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver41 min
May 17, 12:19 PM MDTSevere Thunderstorm WarningBOUDouglas41 min
May 17, 12:30 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld30 min
May 17, 12:50 PM MDTTornado WarningBOUMorgan, Washington40 min
May 17, 1:12 PM MDTSevere Thunderstorm WarningBOUWeld48 min
May 17, 1:30 PM MDTTornado WarningBOUMorgan, Washington45 min
May 17, 1:42 PM MDTTornado WarningBOUMorgan, Weld48 min
May 17, 2:00 PM MDTTornado WarningBOUAdams, Arapahoe45 min
May 17, 2:17 PM MDTTornado WarningBOULogan, Morgan, Washington43 min
May 17, 2:55 PM MDTTornado WarningBOUPhillips35 min
May 17, 2:59 PM MDTTornado WarningBOULogan, Morgan46 min
May 17, 3:24 PM MDTTornado WarningBOUPhillips36 min
May 17, 3:43 PM MDTTornado WarningBOULogan47 min
May 17, 3:56 PM MDTTornado WarningBOUPhillips, Sedgwick34 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.