Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 13, NWS Denver/Boulder, CO

May 28, 2018Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 28, 2018, 5:47 PM MDT for Morgan County, Weld County, Colorado. It was in force for 28 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, 5:47 PM MDT (23:47 UTC)
Expired: May 28, 2018, 6:15 PM MDT
In force: 28 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Morgan County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 109 km from the middle of the area, began a volume at 23:47 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

Denver, CO (KDEN), launched 12:00Z, 11.8 hours before the alert went out and 91 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: 69 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 854 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

826 
WFUS55 KBOU 282347
TORBOU
COC087-123-290015-
/O.NEW.KBOU.TO.W.0013.180528T2347Z-180529T0015Z/

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

The National Weather Service in Denver Colorado has issued a

* Tornado Warning for...
  East central Weld County in northeastern Colorado...
  North central Morgan County in northeastern Colorado...

* Until 615 PM MDT.
    
* At 547 PM MDT, a severe thunderstorm capable of producing a tornado
  was located 7 miles northwest of Antelope Springs, or 15 miles
  north of Fort Morgan, moving northeast at 20 mph.

  HAZARD...Tornado and half dollar 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...
  Stoneham and New Raymer. 

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 4074 10375 4058 10358 4055 10358 4041 10384
      4053 10397
TIME...MOT...LOC 2347Z 221DEG 19KT 4048 10385 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

KRIEDERMAN

1 follow-up statement

351 
WWUS55 KBOU 290012
SVSBOU

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

COC087-123-290021-
/O.EXP.KBOU.TO.W.0013.000000T0000Z-180529T0015Z/
Weld CO-Morgan CO-
612 PM MDT MON MAY 28 2018

...THE TORNADO WARNING FOR EAST CENTRAL WELD AND NORTH CENTRAL MORGAN
COUNTIES WILL EXPIRE AT 615 PM MDT...
    
The tornadic thunderstorm which prompted the warning has weakened. 
Therefore, the warning will be allowed to expire.

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

LAT...LON 4074 10375 4058 10358 4055 10358 4041 10384
      4053 10397
TIME...MOT...LOC 0011Z 221DEG 19KT 4057 10375 

$$

KRIEDERMAN

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 6:09 PM MDT	Severe Thunderstorm Warning	BOU	Phillips, Sedgwick	33 min
May 27, 6:19 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	26 min
May 28, 1:14 PM MDT	Areal Flood Advisory	BOU	Clear Creek, Park	91 min
May 28, 1:52 PM MDT	Severe Thunderstorm Warning	BOU	Park	23 min
May 28, 2:05 PM MDT	Flash Flood Warning	BOU	Jackson	85 min
May 28, 2:38 PM MDT	Flash Flood Watch	BOU	Logan, Morgan, Phillips, Sedgwick, Washington	6 hr
May 28, 2:55 PM MDT	Special Weather Statement	BOU	Jefferson	50 min
May 28, 3:25 PM MDT	Severe Thunderstorm Warning	BOU	Clear Creek, Jefferson, Park	50 min
May 28, 4:03 PM MDT	Severe Thunderstorm Warning	BOU	Weld	42 min
May 28, 4:13 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Denver, Jefferson	47 min
May 28, 4:18 PM MDT	Severe Thunderstorm Warning	BOU	Washington	42 min
May 28, 4:21 PM MDT	Special Weather Statement	BOU	Weld	39 min
May 28, 4:40 PM MDT	Severe Thunderstorm Warning	BOU	Arapahoe, Douglas	50 min
May 28, 4:46 PM MDT	Severe Thunderstorm Warning	BOU	Weld	44 min
May 28, 4:59 PM MDT	Severe Thunderstorm Warning	BOU	Washington	46 min
May 28, 5:04 PM MDT	Tornado Warning Tornado observed	BOU	Washington	26 min
May 28, 5:11 PM MDT	Tornado Warning	BOU	Morgan	34 min
May 28, 5:15 PM MDT	Tornado Warning	BOU	Weld	30 min
May 28, 5:27 PM MDT	Tornado Warning	BOU	Logan, Washington	33 min
May 28, 5:36 PM MDT	Tornado Warning	BOU	Weld	24 min
May 28, 5:38 PM MDT	Tornado Warning	BOU	Weld	37 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.