Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 46, NWS Denver/Boulder, CO

August 7, 2015Morgan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Aug 7, 2015, 4:21 PM MDT for Morgan County, Colorado. It was in force for 24 min. 1 report 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: Aug 7, 2015, 4:21 PM MDT (22:21 UTC)
Expired: Aug 7, 2015, 4:45 PM MDT
In force: 24 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Morgan County, CO

The radar

The Denver radar (KFTG), 86 km from the middle of the area, began a volume at 22:23 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
Aug 7, 4:33 PM MDT	HAIL 1.25	3 E Weldona, CO

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
Aug 7, 3:05 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.4 hours before the alert went out and 77 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: 3310 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

641 
WFUS55 KBOU 072221
TORBOU
COC087-072245-
/O.NEW.KBOU.TO.W.0046.150807T2221Z-150807T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
421 PM MDT FRI AUG 7 2015

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN MORGAN COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 445 PM MDT
    
* AT 421 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR WELDONA...OR 8 MILES NORTHWEST OF FORT
  MORGAN...MOVING EAST AT 15 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...
  WELDONA.

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 IN A MOBILE
HOME...A VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4030 10376 4029 10402 4043 10403 4048 10375
TIME...MOT...LOC 2221Z 255DEG 11KT 4035 10390 

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

$$

RJK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 2:54 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	51 min
Aug 7, 3:42 PM MDT	Severe Thunderstorm Warning	BOU	Morgan, Weld	33 min
Aug 7, 4:05 PM MDT	Severe Thunderstorm Warning	BOU	Douglas, Elbert	25 min
Aug 7, 4:17 PM MDT	Areal Flood Advisory	BOU	Morgan	118 min
Aug 7, 4:28 PM MDT	Severe Thunderstorm Warning	BOU	Elbert	32 min
Aug 7, 4:39 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	51 min
Aug 7, 5:14 PM MDT	Tornado Warning	BOU	Morgan	31 min
Aug 7, 5:32 PM MDT	Areal Flood Advisory	BOU	Morgan	118 min
Aug 7, 5:33 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan	42 min
Aug 7, 5:44 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	31 min
Aug 7, 5:50 PM MDT	Tornado Warning	BOU	Adams, Arapahoe, Washington	40 min
Aug 7, 5:55 PM MDT	Severe Thunderstorm Warning	BOU	Washington	50 min

Nearby

Tornado Warnings in Colorado, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.