Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 25, NWS Denver/Boulder, CO

June 19, 2018Arapahoe County, Elbert County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 19, 2018, 2:57 PM MDT for Arapahoe County, Elbert County, Colorado. It was in force for 33 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
Jun 19, 2018, 2:57 PM MDT (20:57 UTC)
Expired
Jun 19, 2018, 3:30 PM MDT
In force
33 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), 31 km from the middle of the area, began a volume at 21:00 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.

The watch it was issued in

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

IssuedProductOfficeLasted
Jun 19, 12:25 PM MDTTornado WatchSPC7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 9.0 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-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2018-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 30 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2018-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
30 J/kg
Mixed-layer CIN
-220 J/kg
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

519 
WFUS55 KBOU 192057
TORBOU
COC005-039-192130-
/O.NEW.KBOU.TO.W.0025.180619T2057Z-180619T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
257 PM MDT TUE JUN 19 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 330 PM MDT.
    
* At 256 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 13 miles north of Kiowa, or 33 miles southeast of
  Denver, moving east at 20 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 3952 10451 3963 10446 3963 10415 3940 10420
TIME...MOT...LOC 2056Z 288DEG 16KT 3953 10438 

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

$$

SCHLATTER
1 follow-up statement
808 
WWUS55 KBOU 192116
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
316 PM MDT TUE JUN 19 2018

COC005-039-192130-
/O.CON.KBOU.TO.W.0025.000000T0000Z-180619T2130Z/
Elbert CO-Arapahoe CO-
316 PM MDT TUE JUN 19 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM MDT FOR NORTH
CENTRAL ELBERT AND SOUTHEASTERN ARAPAHOE COUNTIES...
    
At 316 PM MDT, a severe thunderstorm capable of producing a tornado
was located 13 miles northeast of Kiowa, or 36 miles northwest of
Limon, moving southeast at 15 mph.

HAZARD...Tornado and golf 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.

This tornadic thunderstorm will remain over mainly rural areas of
north central Elbert and southeastern 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 3948 10440 3960 10436 3959 10416 3940 10421
      3945 10432
TIME...MOT...LOC 2116Z 293DEG 14KT 3950 10429 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

SCHLATTER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 6:12 PM MDTSevere Thunderstorm WarningBOUBoulder, Broomfield, Weld48 min
Jun 18, 6:48 PM MDTSevere Thunderstorm WarningBOUWeld42 min
Jun 18, 6:59 PM MDTSevere Thunderstorm WarningBOUWeld31 min
Jun 18, 7:19 PM MDTSpecial Weather StatementBOUBroomfield26 min
Jun 18, 7:23 PM MDTSevere Thunderstorm WarningBOUWeld52 min
Jun 18, 7:24 PM MDTSevere Thunderstorm WarningBOUAdams, Boulder, Broomfield, Weld51 min
Jun 18, 7:29 PM MDTSevere Thunderstorm WarningBOUWeld46 min
Jun 18, 8:02 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld28 min
Jun 18, 8:06 PM MDTSevere Thunderstorm WarningBOUWeld39 min
Jun 18, 8:16 PM MDTSevere Thunderstorm WarningBOUAdams, Boulder, Broomfield, Denver, Jefferson29 min
Jun 18, 8:27 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld33 min
Jun 18, 8:40 PM MDTSevere Thunderstorm WarningBOUWeld50 min
Jun 18, 8:44 PM MDTSevere Thunderstorm WarningBOUAdams, Broomfield, Weld46 min
Jun 18, 9:17 PM MDTSevere Thunderstorm WarningBOUMorgan28 min
Jun 18, 9:19 PM MDTSevere Thunderstorm WarningBOUWeld26 min
Jun 18, 9:28 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld32 min
Jun 18, 9:41 PM MDTSevere Thunderstorm WarningBOUWeld49 min
Jun 18, 9:42 PM MDTSevere Thunderstorm WarningBOULogan, Morgan, Washington48 min
Jun 18, 9:59 PM MDTSevere Thunderstorm WarningBOUMorgan31 min
Jun 18, 10:05 PM MDTAreal Flood AdvisoryBOUMorgan, Weld2 hr
Jun 18, 10:23 PM MDTSevere Thunderstorm WarningBOULogan, Washington37 min
Jun 18, 10:24 PM MDTSevere Thunderstorm WarningBOUMorgan51 min
Jun 18, 10:49 PM MDTSevere Thunderstorm WarningBOUWeld41 min
Jun 18, 10:57 PM MDTFlash Flood WarningBOUMorgan, Weld3 hr
Jun 18, 10:57 PM MDTSevere Thunderstorm WarningBOULogan, Phillips, Washington33 min
Jun 18, 11:24 PM MDTSevere Thunderstorm WarningBOULogan, Phillips39 min
Jun 18, 11:32 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld43 min
Jun 18, 11:58 PM MDTSevere Thunderstorm WarningBOULogan, Washington25 min
Jun 19, 1:11 AM MDTFlash Flood WarningBOUMorgan, Weld5 hr
Jun 19, 12:06 PM MDTSevere Thunderstorm WarningBOUBoulder24 min
Jun 19, 12:29 PM MDTSevere Thunderstorm WarningBOUBoulder, Weld46 min
Jun 19, 12:33 PM MDTSevere Thunderstorm WarningBOULarimer42 min
Jun 19, 12:53 PM MDTSevere Thunderstorm WarningBOUArapahoe, Denver, Douglas, Jefferson52 min
Jun 19, 12:56 PM MDTSevere Thunderstorm WarningBOUWeld49 min
Jun 19, 1:14 PM MDTTornado WarningBOUWeld31 min
Jun 19, 1:18 PM MDTSevere Thunderstorm WarningBOULarimer, Weld42 min
Jun 19, 1:29 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe46 min
Jun 19, 1:40 PM MDTTornado WarningBOUWeld35 min
Jun 19, 1:43 PM MDTSevere Thunderstorm WarningBOUWeld47 min
Jun 19, 2:02 PM MDTSevere Thunderstorm WarningBOULarimer, Weld43 min
Jun 19, 2:13 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Weld47 min
Jun 19, 2:15 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert45 min
Jun 19, 2:20 PM MDTTornado Warning Tornado observedBOUAdams, Morgan, Weld25 min
Jun 19, 2:36 PM MDTFlash Flood WarningBOUMorgan, Weld114 min
Jun 19, 2:43 PM MDTSevere Thunderstorm WarningBOUWeld47 min
Jun 19, 2:45 PM MDTTornado WarningBOUAdams, Morgan, Weld30 min
Jun 19, 3:22 PM MDTSevere Thunderstorm WarningBOUWashington53 min
Jun 19, 3:26 PM MDTSevere Thunderstorm WarningBOUElbert49 min
Jun 19, 3:29 PM MDTSevere Thunderstorm WarningBOUWeld46 min
Jun 19, 3:30 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas, Elbert45 min
Jun 19, 3:39 PM MDTTornado WarningBOUElbert36 min
Jun 19, 3:57 PM MDTSevere Thunderstorm WarningBOUAdams23 min
Jun 19, 4:04 PM MDTSevere Thunderstorm WarningBOUElbert41 min
Jun 19, 4:10 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld50 min
Jun 19, 4:15 PM MDTSevere Thunderstorm WarningBOULarimer30 min
Jun 19, 4:18 PM MDTSevere Thunderstorm WarningBOUWashington57 min
Jun 19, 4:32 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln58 min
Jun 19, 4:34 PM MDTSevere Thunderstorm WarningBOUWeld41 min
Jun 19, 4:42 PM MDTTornado WarningBOULincoln18 min
Jun 19, 4:51 PM MDTTornado WarningBOUMorgan24 min
Jun 19, 4:57 PM MDTTornado Warning Tornado observedBOULincoln33 min
Jun 19, 5:15 PM MDTSevere Thunderstorm WarningBOUWeld45 min
Jun 19, 5:22 PM MDTTornado WarningBOULincoln13 min
Jun 19, 5:24 PM MDTSevere Thunderstorm WarningBOUElbert51 min

Nearby

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