Alert archive / Colorado / Tornado Warnings in 2005

Tornado Warning 1, NWS Denver/Boulder, CO

April 19, 2005Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Apr 19, 2005, 3:59 PM MDT for Logan County, Colorado. It was in force for 31 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, 3:59 PM MDT (21:59 UTC)
Expired: Apr 19, 2005, 4:30 PM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO
Area: Counties, with a storm outline in the text

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 137 km from the middle of the area, began a volume at 21:59 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, 10.0 hours before the alert went out and 104 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 
WFUS55 KBOU 192159
TORBOU
COC075-192230-
/O.NEW.KBOU.TO.W.0001.050419T2159Z-050419T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
359 PM MDT TUE APR 19 2005

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL LOGAN COUNTY IN NORTHEAST COLORADO

* UNTIL 430 PM MDT

* AT 356 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO OVER
  NORTH STERLING RESERVOIR...OR ABOUT 11 MILES NORTH OF STERLING.
  THIS STORM WAS MOVING EAST AT 15 MPH.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PADRONI...
  NORTH STERLING RESERVOIR AND ILIFF.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 4073 10338 4076 10305 4092 10303 4088 10334

$$
DANKERS

2 follow-up statements

000 
WWUS55 KBOU 192214
SVSBOU

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

COC075-192230-
/O.CON.KBOU.TO.W.0001.000000T0000Z-050419T2230Z/
LOGAN CO-
413 PM MDT TUE APR 19 2005

...A TORNADO WARNING CONTINUES UNTIL 430 PM MDT FOR CENTRAL LOGAN
COUNTY...

AT 407 PM MDT...THIS STORM WAS LOCATED OVER NORTH STERLING 
RESERVOIR...OR ABOUT 11 MILES NORTH OF STERLING. THIS STORM WAS 
MOVING EAST AT 10 MPH.  STATE PARK PERSONNEL REPORTED A BRIEF 
TORNADO WITH THIS STORM JUST BEFORE 4 PM.  THE STORM HAS ALSO 
PRODUCED HAIL UP TO 2 INCHES IN DIAMETER.  THE STORM CONTINUES TO BE 
CAPABLE OF PRODUCING A TORNADO AND LARGE HAIL.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
PADRONI AND NORTH STERLING RESERVOIR.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING LARGE
DAMAGING HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

LAT...LON 4073 10338 4076 10305 4092 10303 4088 10334

$$
DANKERS

000 
WWUS55 KBOU 192228
SVSBOU

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

COC075-192237-
/O.EXP.KBOU.TO.W.0001.000000T0000Z-050419T2230Z/
LOGAN CO-
427 PM MDT TUE APR 19 2005

...THE TORNADO WARNING FOR CENTRAL LOGAN COUNTY EXPIRES AT 430 PM
MDT...

THERE HAVE BEEN NO ADDITIONAL REPORTS OF TORNADOS FROM THE 
THUNDERSTORM OVER NORTH STERLING RESERVOIR.  THE STORM MAY STILL 
PRODUCE LARGE HAIL AS IT MOVES NORTH OF PADRONI.

LAT...LON 4073 10338 4076 10305 4092 10303 4088 10334

$$
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, 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
Apr 19, 5:43 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe	47 min

Nearby

Tornado Warnings in Colorado, 2005 Every tornado warning in 2005 Tornadoes 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.