Alert archive / Colorado / Tornado Warnings in 2020

Tornado Warning 4, NWS Denver/Boulder, CO

July 19, 2020Phillips County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 19, 2020, 6:14 PM MDT for Phillips County, Colorado. It was in force for 31 min. 4 reports 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 19, 2020, 6:14 PM MDT (00:14 UTC)
Expired: Jul 19, 2020, 6:45 PM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Phillips County, CO

The radar

The Goodland radar (KGLD), 155 km from the middle of the area, began a volume at 00:13 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 19, 6:21 PM MDT	TSTM WND GST 61	2 S Haxtun, CO
Jul 19, 6:30 PM MDT	TORNADO 1	4 Se Fairfield, CO	PUBLIC REPORTED BRIEF TORNADO.
Jul 19, 6:30 PM MDT	TORNADO	4 Se Fairfield, CO	CORRECTS PREVIOUS TORNADO REPORT FROM 4 SE FAIRFIELD. PUBLIC REPORTED BRIEF TORNADO.
Jul 19, 6:30 PM MDT	TORNADO	4 Se Fairfield, CO	PUBLIC REPORTED BRIEF TORNADO.

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 19, 4:06 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.2 hours before the alert went out and 101 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: 2804 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

847 
WFUS55 KBOU 200014
TORBOU
COC095-200045-
/O.NEW.KBOU.TO.W.0004.200720T0014Z-200720T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
614 PM MDT Sun Jul 19 2020

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  Western Phillips County in northeastern Colorado...

* Until 645 PM MDT.
    
* At 614 PM MDT, a severe thunderstorm capable of producing a tornado
  was located over Haxtun, or 16 miles west of Holyoke, moving
  southeast at 20 mph.

  HAZARD...Tornado and quarter 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...
  Haxtun, Paoli, Fairfield and Highland Center. 

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 4044 10242 4044 10266 4071 10266 4071 10265
      4075 10265 4075 10232
TIME...MOT...LOC 0014Z 309DEG 17KT 4064 10261 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

RPK

2 follow-up statements

366 
WWUS55 KBOU 200023
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
623 PM MDT Sun Jul 19 2020

COC095-200045-
/O.CON.KBOU.TO.W.0004.000000T0000Z-200720T0045Z/
Phillips CO-
623 PM MDT Sun Jul 19 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR WESTERN
PHILLIPS COUNTY...
    
At 623 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Haxtun, or 13 miles west of Holyoke, moving
southeast at 20 mph.

HAZARD...Tornado and quarter 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...
Haxtun, Paoli, Fairfield and Highland Center. 

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 4044 10242 4044 10266 4071 10266 4071 10265
      4075 10265 4075 10232
TIME...MOT...LOC 0023Z 309DEG 17KT 4061 10257 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

RPK

704 
WWUS55 KBOU 200048
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
648 PM MDT Sun Jul 19 2020

COC095-200058-
/O.EXP.KBOU.TO.W.0004.000000T0000Z-200720T0045Z/
Phillips CO-
648 PM MDT Sun Jul 19 2020

...THE TORNADO WARNING FOR WESTERN PHILLIPS COUNTY HAS EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
northeastern Colorado.

LAT...LON 4044 10242 4044 10266 4071 10266 4071 10265
      4075 10265 4075 10232
TIME...MOT...LOC 0048Z 309DEG 17KT 4054 10245 

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 6:05 PM MDT	Tornado Warning	BOU	Logan, Sedgwick	25 min
Jul 19, 6:34 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	26 min
Jul 20, 3:55 PM MDT	Severe Thunderstorm Warning	BOU	Weld	50 min
Jul 20, 4:14 PM MDT	Areal Flood Warning	BOU	Larimer, Weld	3 hr
Jul 20, 4:18 PM MDT	Flash Flood Warning	BOU	Larimer, Weld	3 hr
Jul 20, 4:43 PM MDT	Severe Thunderstorm Warning	BOU	Larimer, Weld	32 min
Jul 20, 5:14 PM MDT	Severe Thunderstorm Warning	BOU	Weld	31 min
Jul 20, 5:15 PM MDT	Severe Thunderstorm Warning	BOU	Weld	28 min
Jul 20, 5:20 PM MDT	Areal Flood Advisory	BOU	Weld	115 min
Jul 20, 5:24 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	20 min

Nearby

Tornado Warnings in Colorado, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.