Alert archive / Colorado / Tornado Warnings in 2021

Tornado Warning 17, NWS Denver/Boulder, CO

May 23, 20214 counties in Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 23, 2021, 1:47 PM MDT for 4 counties in Colorado. It was in force for 28 min. 2 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: May 23, 2021, 1:47 PM MDT (19:47 UTC)
Expired: May 23, 2021, 2:15 PM MDT
In force: 28 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, Lincoln County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 76 km from the middle of the area, began a volume at 19:49 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
May 23, 2:01 PM MDT	TORNADO	9 Se Cottonwood Valley, CO
May 23, 2:25 PM MDT	TORNADO	2 N Last Chance, CO	PRELIMINARY.

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
May 23, 12:06 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 7.8 hours before the alert went out and 53 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: 1106 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

634 
WFUS55 KBOU 231947
TORBOU
COC005-039-073-121-232015-
/O.NEW.KBOU.TO.W.0017.210523T1947Z-210523T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
147 PM MDT Sun May 23 2021

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  Northeastern Elbert County in east central Colorado...
  Southeastern Arapahoe County in northeastern Colorado...
  Southwestern Washington County in northeastern Colorado...
  North central Lincoln County in east central Colorado...

* Until 215 PM MDT.
    
* At 147 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 12 miles east of Agate, or 12 miles north of Limon,
  moving northeast at 45 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.

* Locations impacted include...
  Last Chance.

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 3941 10384 3957 10377 3962 10375 3969 10372
      3979 10365 3970 10337 3935 10369
TIME...MOT...LOC 1947Z 209DEG 41KT 3945 10371 

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

$$

DANIELSON

1 follow-up statement

245 
WWUS55 KBOU 232004
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
204 PM MDT Sun May 23 2021

COC005-039-232013-
/O.CAN.KBOU.TO.W.0017.000000T0000Z-210523T2015Z/
Elbert CO-Arapahoe CO-
204 PM MDT Sun May 23 2021

...THE TORNADO WARNING FOR NORTHEASTERN ELBERT AND SOUTHEASTERN
ARAPAHOE COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM MDT for northeastern
and east central Colorado.

LAT...LON 3945 10372 3964 10371 3979 10365 3970 10337
      3942 10363
TIME...MOT...LOC 2003Z 209DEG 41KT 3962 10359 

$$

COC073-121-232015-
/O.CON.KBOU.TO.W.0017.000000T0000Z-210523T2015Z/
Washington CO-Lincoln CO-
204 PM MDT Sun May 23 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 215 PM MDT FOR
SOUTHWESTERN WASHINGTON AND NORTH CENTRAL LINCOLN COUNTIES...
    
At 203 PM MDT, a severe thunderstorm capable of producing a tornado
was located 8 miles south of Last Chance, or 24 miles north of Limon,
moving northeast at 45 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.

Locations impacted include...
Last Chance.

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 3945 10372 3964 10371 3979 10365 3970 10337
      3942 10363
TIME...MOT...LOC 2003Z 209DEG 41KT 3962 10359 

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

$$

DANIELSON

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 6:06 PM MDT	Tornado Warning	BOU	Washington	24 min
May 22, 8:00 PM MDT	Special Weather Statement	BOU	Phillips	30 min
May 22, 8:29 PM MDT	Special Weather Statement	BOU	Phillips, Sedgwick	46 min
May 22, 9:37 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	38 min
May 23, 12:40 PM MDT	Tornado Warning	BOU	Elbert, Lincoln	19 min
May 23, 12:41 PM MDT	Special Weather Statement	BOU	Weld	49 min
May 23, 12:50 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	40 min
May 23, 1:24 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	36 min
May 23, 1:28 PM MDT	Special Weather Statement	BOU	Weld	32 min
May 23, 2:13 PM MDT	Tornado Warning	BOU	Washington	32 min
May 23, 2:44 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Washington	31 min
May 23, 2:55 PM MDT	Tornado Warning	BOU	Washington	20 min
May 23, 3:11 PM MDT	Tornado Warning	BOU	Logan, Washington	34 min
May 23, 3:14 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Elbert, Lincoln, Washington	46 min
May 23, 3:42 PM MDT	Tornado Warning	BOU	Logan	33 min
May 23, 4:06 PM MDT	Areal Flood Advisory	BOU	Washington	3 hr
May 23, 4:10 PM MDT	Tornado Warning Tornado observedConsiderable damage threat	BOU	Logan	20 min
May 23, 4:27 PM MDT	Tornado Warning	BOU	Logan	23 min
May 23, 4:43 PM MDT	Tornado Warning	BOU	Washington	17 min
May 23, 4:58 PM MDT	Tornado Warning	BOU	Washington	17 min
May 23, 5:12 PM MDT	Areal Flood Advisory	BOU	Logan, Washington	104 min
May 23, 5:13 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Phillips, Washington	32 min
May 23, 5:31 PM MDT	Tornado Warning	BOU	Washington	14 min

Nearby

Tornado Warnings in Colorado, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.