Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 48, NWS Denver/Boulder, CO

July 29, 2018Elbert County, Lincoln County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 29, 2018, 7:04 PM MDT for Elbert County, Lincoln County, Colorado. It was in force for 26 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 29, 2018, 7:04 PM MDT (01:04 UTC)
Expired: Jul 29, 2018, 7:30 PM MDT
In force: 26 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

Counties Elbert County, CO, Lincoln County, CO

The radar

The Pueblo radar (KPUX), 99 km from the middle of the area, began a volume at 01:05 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	Remark
Jul 29, 7:06 PM MDT	TSTM WND GST 70	Limon, CO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 29, 1:07 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.1 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: 943 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 1653 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

As transmitted.

844 
WFUS55 KBOU 300104
TORBOU
COC039-073-300130-
/O.NEW.KBOU.TO.W.0048.180730T0104Z-180730T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
704 PM MDT SUN JUL 29 2018

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  East central Elbert County in east central Colorado...
  Northeastern Lincoln County in east central Colorado...

* Until 730 PM MDT.
    
* At 703 PM MDT, a severe thunderstorm capable of producing a tornado
  was located over Limon, moving south at 40 mph.

  HAZARD...Tornado and ping pong ball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Limon, Hugo, Arriba and Genoa. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This Tornado Warning replaces the Severe Thunderstorm Warning issued
for the same area.

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3934 10382 3942 10329 3899 10319 3898 10371
TIME...MOT...LOC 0103Z 352DEG 36KT 3929 10371 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

RJK

1 follow-up statement

949 
WWUS55 KBOU 300126
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
726 PM MDT SUN JUL 29 2018

COC039-073-300135-
/O.EXP.KBOU.TO.W.0048.000000T0000Z-180730T0130Z/
Elbert CO-Lincoln CO-
726 PM MDT SUN JUL 29 2018

...THE TORNADO WARNING FOR EAST CENTRAL ELBERT AND NORTHEASTERN
LINCOLN COUNTIES WILL EXPIRE AT 730 PM MDT...
    
The tornadic thunderstorm which prompted the warning has weakened 
and moved out of the warned area. Therefore, the warning will be 
allowed to expire.

A Tornado Watch remains in effect until 900 PM MDT for east central
Colorado.

LAT...LON 3934 10382 3942 10329 3899 10319 3898 10371
TIME...MOT...LOC 0125Z 352DEG 36KT 3907 10367 

$$

RJK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 6:25 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln, Washington	50 min
Jul 29, 6:43 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	32 min
Jul 29, 7:04 PM MDT	Severe Thunderstorm Warning	BOU	Weld	26 min
Jul 29, 7:28 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Weld	32 min
Jul 29, 7:59 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	31 min
Jul 29, 8:27 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Elbert	33 min
Jul 29, 8:58 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	32 min
Jul 29, 9:25 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	35 min

Nearby

Tornado Warnings in Colorado, 2018 Every tornado warning in 2018 Tornadoes in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.