Alert archive / Colorado / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 13, NWS Denver/Boulder, CO

April 29, 2000Larimer County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 29, 2000, 3:57 PM MDT for Larimer County, Colorado. It was in force for 48 min. 8 reports came from 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, with what was reported inside it.

The facts

Issued: Apr 29, 2000, 3:57 PM MDT (21:57 UTC)
Expired: Apr 29, 2000, 4:45 PM MDT
In force: 48 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 86 km from the middle of the area, began a volume at 22:00 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.

What was reported inside it

Time	Report	Where
Apr 29, 4:15 PM MDT	Hail 1.5	Loveland, CO
Apr 29, 4:30 PM MDT	Hail 0.75	Ft Collins, CO
Apr 29, 4:35 PM MDT	Hail 0.75	Ft Collins, CO
Apr 29, 4:40 PM MDT	Hail 1.5	Ft Collins, CO
Apr 29, 4:40 PM MDT	Hail 2.25	Ft Collins, CO
Apr 29, 4:41 PM MDT	Hail 0.75	Ft Collins, CO
Apr 29, 4:43 PM MDT	Hail 1	Ft Collins, CO
Apr 29, 4:47 PM MDT	Hail 1	Ft Collins, CO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.0 hours before the alert went out and 184 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2658 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

582 
WUUS55 KBOU 292159
SVRDEN
COC069-292245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
357 PM MDT SAT APR 29 2000

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN LARIMER COUNTY IN NORTH CENTRAL COLORADO
  THIS INCLUDES THE CITY OF FORT COLLINS

* UNTIL 445 PM MDT

* AT 357 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES SOUTHEAST OF DRAKE...OR ABOUT 15 MILES
  SOUTHWEST OF FORT COLLINS...MOVING NORTHEAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...BUT ARE NOT LIMITED TO...FORT
COLLINS...TEDS PLACE...MASONVILLE...LOVELAND...HARMONY...DRAKE...
BUCKHORN MOUNTAIN AND BELLVUE.

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 55 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

LAT...LON 4045 10541 4028 10539 4027 10513 4044 10499
          4069 10510 4063 10533

KLEYLA

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 4:22 PM MDT	Severe Thunderstorm Warning	BOU	Boulder, Weld	53 min
Apr 29, 4:46 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	44 min
Apr 29, 5:30 PM MDT	Severe Thunderstorm Warning	BOU	Weld	40 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2000 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.