Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 52, NWS Denver/Boulder, CO

August 14, 2018Arapahoe County, Elbert County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Aug 14, 2018, 8:01 PM MDT for Arapahoe County, Elbert County, Colorado. It was in force for 29 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: Aug 14, 2018, 8:01 PM MDT (02:01 UTC)
Expired: Aug 14, 2018, 8:30 PM MDT
In force: 29 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Arapahoe County, CO, Elbert County, CO

The radar

The Denver radar (KFTG), 37 km from the middle of the area, began a volume at 02:03 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 (KDEN), launched 00:00Z, 2.0 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: 507 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 2178 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

188 
WFUS55 KBOU 150201
TORBOU
COC005-039-150230-
/O.NEW.KBOU.TO.W.0052.180815T0201Z-180815T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
801 PM MDT TUE AUG 14 2018

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  North central Elbert County in east central Colorado...
  South central Arapahoe County in northeastern Colorado...

* Until 830 PM MDT.
    
* At 800 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 13 miles north of Kiowa, or 31 miles southeast of
  Denver, moving southeast at 25 mph.

  HAZARD...Tornado.

  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.

* This tornadic thunderstorm will remain over mainly rural areas of
  north central Elbert and south central Arapahoe Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3950 10455 3966 10444 3951 10400 3928 10418
TIME...MOT...LOC 0200Z 300DEG 23KT 3954 10441 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

HANSON

1 follow-up statement

667 
WWUS55 KBOU 150221
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
821 PM MDT TUE AUG 14 2018

COC005-039-150230-
/O.EXP.KBOU.TO.W.0052.000000T0000Z-180815T0230Z/
Elbert CO-Arapahoe CO-
821 PM MDT TUE AUG 14 2018

...THE TORNADO WARNING FOR NORTH CENTRAL ELBERT AND SOUTH CENTRAL
ARAPAHOE COUNTIES WILL EXPIRE AT 830 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 3950 10455 3966 10444 3951 10400 3928 10418
TIME...MOT...LOC 0220Z 300DEG 23KT 3948 10427 

$$

HANSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:13 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Denver	47 min
Aug 14, 6:30 PM MDT	Special Weather Statement	BOU	Douglas	45 min
Aug 14, 6:31 PM MDT	Special Weather Statement	BOU	Douglas	44 min
Aug 14, 6:39 PM MDT	Areal Flood Advisory	BOU	Douglas	111 min
Aug 14, 6:59 PM MDT	Special Weather Statement	BOU	Arapahoe, Denver	61 min
Aug 14, 7:09 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver	96 min
Aug 14, 7:25 PM MDT	Special Weather Statement	BOU	Douglas	20 min
Aug 14, 7:29 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Elbert	46 min
Aug 14, 10:10 PM MDT	Special Weather Statement	BOU	Park	50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.