Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 50, NWS Denver/Boulder, CO

August 7, 2015Morgan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Aug 7, 2015, 6:49 PM MDT for Morgan County, Washington County, Colorado. It was in force for 26 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
Aug 7, 2015, 6:49 PM MDT (00:49 UTC)
Expired
Aug 7, 2015, 7:15 PM MDT
In force
26 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.5 in

Counties Morgan County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 102 km from the middle of the area, began a volume at 00:49 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.

IssuedProductOfficeLasted
Aug 7, 3:05 PM MDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 0.8 hours before the alert went out and 48 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2015-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2015-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
5 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
3228 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
176 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.

739 
WFUS55 KBOU 080049
TORBOU
COC087-121-080115-
/O.NEW.KBOU.TO.W.0050.150808T0049Z-150808T0115Z/

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

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN MORGAN COUNTY IN NORTHEASTERN COLORADO...
  NORTH CENTRAL WASHINGTON COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 715 PM MDT
    
* AT 649 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR BRUSH...OR 10 MILES EAST OF FORT MORGAN...
  MOVING EAST AT 30 MPH.

  HAZARD...TORNADO AND PING PONG BALL 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...
  BRUSH...HILLROSE...SNYDER...MIDWAY AND GARY. 

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 4034 10331 4003 10336 4010 10377 4030 10372
      4035 10357
TIME...MOT...LOC 0049Z 247DEG 27KT 4022 10360 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

RJK
1 follow-up statement
134 
WWUS55 KBOU 080106
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
706 PM MDT FRI AUG 7 2015

COC087-121-080115-
/O.EXP.KBOU.TO.W.0050.000000T0000Z-150808T0115Z/
MORGAN CO-WASHINGTON CO-
706 PM MDT FRI AUG 7 2015

...THE TORNADO WARNING FOR SOUTHEASTERN MORGAN AND NORTH CENTRAL
WASHINGTON COUNTIES WILL EXPIRE AT 715 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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT FOR
NORTHEASTERN COLORADO.

LAT...LON 4034 10331 4003 10336 4010 10377 4030 10372
      4035 10357
TIME...MOT...LOC 0103Z 247DEG 27KT 4022 10360 

$$

RJK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 6:14 PM MDTSevere Thunderstorm WarningBOUMorgan31 min
Aug 7, 6:33 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Washington42 min
Aug 7, 6:33 PM MDTTornado WarningBOUWashington27 min
Aug 7, 6:54 PM MDTTornado WarningBOUWashington25 min
Aug 7, 7:22 PM MDTSevere Thunderstorm WarningBOUWashington38 min
Aug 7, 7:25 PM MDTSevere Thunderstorm WarningBOUPhillips50 min
Aug 7, 9:52 PM MDTAreal Flood AdvisoryBOUWashington3 hr

Nearby

Tornado Warnings in Colorado, 2015Every tornado warning in 2015Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.