Alert archive / Colorado / Tornado Warnings in 2018

Tornado Warning 4, NWS Denver/Boulder, CO

May 27, 2018Morgan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 27, 2018, 4:28 PM MDT for Morgan County, Colorado. It was in force for 17 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 27, 2018, 4:28 PM MDT (22:28 UTC)
Expired: May 27, 2018, 4:45 PM MDT
In force: 17 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Morgan County, CO

The radar

The Denver radar (KFTG), 99 km from the middle of the area, began a volume at 22:30 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 27, 1:13 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.5 hours before the alert went out and 59 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: 4365 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

755 
WFUS55 KBOU 272228
TORBOU
COC087-272245-
/O.NEW.KBOU.TO.W.0004.180527T2228Z-180527T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Denver CO
428 PM MDT SUN MAY 27 2018

The National Weather Service in Denver Colorado has issued a

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

* Until 445 PM MDT.
    
* At 427 PM MDT, a severe thunderstorm capable of producing a tornado
  was located near Snyder, or 9 miles east of Fort Morgan, moving
  north at 20 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Expect damage to mobile homes, roofs, and vehicles.

* Locations impacted include...
  Brush and Snyder. 

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 4027 10367 4038 10367 4038 10353 4027 10353
TIME...MOT...LOC 2227Z 194DEG 19KT 4030 10362 

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

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 27, 12:27 PM MDT	Special Weather Statement	BOU	Larimer	33 min
May 27, 1:45 PM MDT	Tornado Warning	BOU	Adams, Weld	30 min
May 27, 2:14 PM MDT	Severe Thunderstorm Warning	BOU	Weld	31 min
May 27, 2:23 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	50 min
May 27, 2:44 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	31 min
May 27, 2:47 PM MDT	Severe Thunderstorm Warning	BOU	Lincoln	31 min
May 27, 3:06 PM MDT	Tornado Warning	BOU	Morgan, Weld	24 min
May 27, 3:36 PM MDT	Special Weather Statement	BOU	Lincoln	24 min
May 27, 4:20 PM MDT	Severe Thunderstorm Warning	BOU	Washington	40 min
May 27, 4:37 PM MDT	Tornado Warning	BOU	Morgan	23 min
May 27, 4:58 PM MDT	Tornado Warning	BOU	Morgan, Weld	18 min
May 27, 5:21 PM MDT	Special Weather Statement	BOU	Logan	39 min
May 27, 5:38 PM MDT	Severe Thunderstorm Warning	BOU	Logan	52 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.