Alert archive / Colorado / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 21, NWS Denver/Boulder, CO

April 19, 2005Arapahoe County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 19, 2005, 5:43 PM MDT for Arapahoe County, Colorado. It was in force for 47 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 19, 2005, 5:43 PM MDT (23:43 UTC)
Expired: Apr 19, 2005, 6:30 PM MDT
In force: 47 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Arapahoe County, CO

The radar

The Denver radar (KFTG), 42 km from the middle of the area, began a volume at 23:46 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.

Issued	Product	Office	Lasted
Apr 19, 2:30 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.7 hours before the alert went out and 78 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: 1796 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -62 m²/s²
0-3 km storm-relative helicity: -3 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.

000 
WUUS55 KBOU 192344
SVRBOU
COC005-200030-
/O.NEW.KBOU.SV.W.0021.050419T2343Z-050420T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
543 PM MDT TUE APR 19 2005

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO

* UNTIL 630 PM MDT

* AT 540 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED OVER DEER TRAIL...OR ABOUT 32 MILES NORTHWEST OF
  LIMON...MOVING NORTHEAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DEER TRAIL.
  THE STORM WILL BE MOVING OVER INTERSTATE 70 THROUGH 600 PM MDT. 

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.

LAT...LON 3962 10428 3953 10410 3971 10374 3974 10404

$$
DANKERS

2 follow-up statements

000 
WWUS55 KBOU 200009
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
607 PM MDT TUE APR 19 2005

COC005-200030-
/O.CON.KBOU.SV.W.0021.000000T0000Z-050420T0030Z/
ARAPAHOE CO-
607 PM MDT TUE APR 19 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 630 PM MDT FOR
EASTERN ARAPAHOE COUNTY...

AT 605 PM MDT...AMATEUR RADIO WEATHER SPOTTERS REPORTED HEAVY RAIN 
AND SMALL HAIL ON INTERSTATE 70 NEAR DEER TRAIL.  THIS STORM WAS 
LOCATED 6 MILES NORTHEAST OF DEER TRAIL...OR ABOUT 32 MILES 
NORTHWEST OF LIMON...MOVING NORTHEAST AT 15 MPH.  THE STORM IS 
CAPABLE OF PRODUCING HAIL UP TO THE SIZE OF PENNIES.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DEER TRAIL.

LAT...LON 3962 10428 3953 10410 3971 10374 3974 10404

$$
DANKERS

000 
WWUS55 KBOU 200022
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
622 PM MDT TUE APR 19 2005

COC005-200032-
/O.CAN.KBOU.SV.W.0021.000000T0000Z-050420T0030Z/
ARAPAHOE CO-
622 PM MDT TUE APR 19 2005

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ARAPAHOE COUNTY IS
CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO 
LONGER EXPECTED TO PRODUCE SEVERE WEATHER. HEAVY RAIN AND SMALL HAIL 
WERE REPORTED AS THE STORM MOVED ACROSS INTERSTATE 70.

LAT...LON 3962 10428 3953 10410 3971 10374 3974 10404

$$
DANKERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 3:39 PM MDT	Severe Thunderstorm Warning	BOU	Logan	51 min
Apr 19, 3:51 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	39 min
Apr 19, 3:59 PM MDT	Tornado Warning	BOU	Logan	31 min
Apr 19, 4:13 PM MDT	Severe Thunderstorm Warning	BOU	Larimer	53 min
Apr 19, 4:33 PM MDT	Severe Thunderstorm Warning	BOU	Broomfield, Jefferson	30 min
Apr 19, 4:35 PM MDT	Severe Thunderstorm Warning	BOU	Logan	55 min
Apr 19, 4:45 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Denver, Weld	45 min
Apr 19, 4:54 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert	52 min
Apr 19, 4:55 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	54 min
Apr 19, 5:00 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Jefferson	34 min
Apr 19, 5:32 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Broomfield, Weld	34 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2005 Every severe thunderstorm warning in 2005

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.