Alert archive / Colorado / Tornado Warnings in 2021

Tornado Warning 15, NWS Denver/Boulder, CO

May 22, 2021Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 22, 2021, 6:06 PM MDT for Washington County, Colorado. It was in force for 24 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: May 22, 2021, 6:06 PM MDT (00:06 UTC)
Expired: May 22, 2021, 6:30 PM MDT
In force: 24 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Washington County, CO

The radar

The Denver radar (KFTG), 88 km from the middle of the area, began a volume at 00:06 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.

Issued	Product	Office	Lasted
May 22, 12:20 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.1 hours before the alert went out and 33 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: 34 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 279 m²/s²
0-3 km storm-relative helicity: 385 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

743 
WFUS55 KBOU 230006
TORBOU
COC121-230030-
/O.NEW.KBOU.TO.W.0015.210523T0006Z-210523T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
606 PM MDT Sat May 22 2021

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  Southwestern Washington County in northeastern Colorado...

* Until 630 PM MDT.
    
* At 606 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 6 miles south of Last Chance, or 26 miles north of
  Limon, moving north at 40 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...
  Woodlin School, Last Chance and Lindon. 

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 3957 10344 3956 10359 3959 10370 3991 10364
      3985 10332
TIME...MOT...LOC 0006Z 196DEG 35KT 3964 10356 

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

$$

DANIELSON

1 follow-up statement

938 
WWUS55 KBOU 230024
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
624 PM MDT Sat May 22 2021

COC121-230033-
/O.EXP.KBOU.TO.W.0015.000000T0000Z-210523T0030Z/
Washington CO-
624 PM MDT Sat May 22 2021

...THE TORNADO WARNING FOR SOUTHWESTERN WASHINGTON COUNTY WILL EXPIRE
AT 630 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.

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

LAT...LON 3957 10344 3956 10359 3959 10370 3991 10364
      3985 10332
TIME...MOT...LOC 0023Z 196DEG 35KT 3978 10351 

$$

DANIELSON

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 1:47 PM MDT	Tornado Warning	BOU	Arapahoe, Elbert, Lincoln, Washington	28 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.