Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 16, NWS Denver/Boulder, CO

May 28, 2018Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 28, 2018, 6:37 PM MDT for Weld County, Colorado. It was in force for 23 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 28, 2018, 6:37 PM MDT (00:37 UTC)
Expired: May 28, 2018, 7:00 PM MDT
In force: 23 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Weld County, CO

The radar

The Cheyenne radar (KCYS), 99 km from the middle of the area, began a volume at 00:39 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 28, 2:01 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.6 hours before the alert went out and 258 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: 410 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 1525 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

908 
WFUS55 KBOU 290037
TORBOU
COC123-290100-
/O.NEW.KBOU.TO.W.0016.180529T0037Z-180529T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
637 PM MDT MON MAY 28 2018

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  Northeastern Weld County in northeastern Colorado...

* Until 700 PM MDT.
    
* At 636 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 12 miles west of Westplains, or 21 miles south of
  Kimball, moving north at 30 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.

* This tornadic thunderstorm will remain over mainly rural areas of
  northeastern Weld County.

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 4087 10357 4080 10360 4094 10384 4100 10383
      4100 10357
TIME...MOT...LOC 0036Z 193DEG 24KT 4093 10372 

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

$$

KRIEDERMAN

1 follow-up statement

260 
WWUS55 KBOU 290059
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
659 PM MDT MON MAY 28 2018

COC123-290108-
/O.EXP.KBOU.TO.W.0016.000000T0000Z-180529T0100Z/
Weld CO-
659 PM MDT MON MAY 28 2018

...THE TORNADO WARNING FOR NORTHEASTERN WELD COUNTY WILL EXPIRE AT
700 PM MDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
northeastern Colorado.

LAT...LON 4087 10357 4080 10360 4094 10384 4100 10383
      4100 10357
TIME...MOT...LOC 0058Z 193DEG 24KT 4036 10363 

$$

KRIEDERMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 6:04 PM MDT	Tornado Warning	BOU	Logan	26 min
May 28, 6:28 PM MDT	Severe Thunderstorm Warning	BOU	Weld	32 min
May 28, 6:35 PM MDT	Tornado Warning	BOU	Morgan	25 min
May 28, 6:52 PM MDT	Severe Thunderstorm Warning	BOU	Logan	23 min
May 29, 12:43 AM MDT	Special Weather Statement	BOU	Lincoln	47 min
May 29, 1:30 AM MDT	Special Weather Statement	BOU	Lincoln	45 min
May 29, 1:43 AM MDT	Severe Thunderstorm Warning	BOU	Lincoln	32 min
May 29, 12:18 PM MDT	Severe Thunderstorm Warning	BOU	Logan	27 min
May 29, 1:31 PM MDT	Severe Thunderstorm Warning	BOU	Washington	26 min
May 29, 2:29 PM MDT	Special Weather Statement	BOU	Lincoln	46 min
May 29, 3:29 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	46 min
May 29, 5:02 PM MDT	Special Weather Statement	BOU	Washington	43 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.