Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 13, NWS Denver/Boulder, CO

May 15, 2015Adams County, Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 15, 2015, 1:58 PM MDT for Adams County, Morgan County, Weld County, Colorado. It was in force for 37 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: May 15, 2015, 1:58 PM MDT (19:58 UTC)
Expired: May 15, 2015, 2:35 PM MDT
In force: 37 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

Counties Adams County, CO, Morgan County, CO, Weld County, CO

What was reported inside it

Time	Report	Where	Remark
May 15, 2:03 PM MDT	TORNADO	4 Wsw Hoyt, 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
May 15, 12:58 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 8.0 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: 15 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: -6 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.

047 
WFUS55 KBOU 151958
TORBOU
COC001-087-123-152045-
/O.NEW.KBOU.TO.W.0013.150515T1958Z-150515T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
158 PM MDT FRI MAY 15 2015

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN ADAMS COUNTY IN NORTHEASTERN COLORADO...
  SOUTHWESTERN MORGAN COUNTY IN NORTHEASTERN COLORADO...
  SOUTH CENTRAL WELD COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 245 PM MDT

* AT 156 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 11 MILES SOUTHWEST OF HOYT...OR 32 MILES 
  SOUTHWEST OF FORT MORGAN...MOVING NORTHEAST AT 20 MPH. THIS 
  TORNADO WARNING REPLACES THE PREVIOUS TORNADO WARNING THAT WAS IN 
  EFFECT UNTIL 2 PM MDT. 

  HAZARD...TORNADO AND PING PONG BALL SIZE HAIL. 

  SOURCE...WEATHER SPOTTERS CONTINUE REPORTING A LARGE WALL CLOUD. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT   
         SHELTER. MOBILE HOMES COULD BE DAMAGED OR DESTROYED.        
         DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE    
         DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  HOYT AND ADENA. 

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 4001 10384 3983 10426 3996 10442 4027 10422
TIME...MOT...LOC 1956Z 227DEG 22KT 3995 10427 

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

$$

DANKERS

3 follow-up statements

856 
WWUS55 KBOU 152009
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
209 PM MDT FRI MAY 15 2015

COC001-087-123-152045-
/O.CON.KBOU.TO.W.0013.000000T0000Z-150515T2045Z/
ADAMS CO-MORGAN CO-WELD CO-
209 PM MDT FRI MAY 15 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM MDT FOR
NORTHEASTERN ADAMS...SOUTHWESTERN MORGAN AND SOUTH CENTRAL WELD
COUNTIES...
    
AT 206 PM MDT...A CONFIRMED TORNADO WAS LOCATED 7 MILES WEST OF
HOYT...OR 28 MILES SOUTHWEST OF FORT MORGAN...MOVING NORTHEAST AT 25 
MPH. AT 203 PM MDT...A SPOTTER REPORTED A TORNADO ABOUT 4 MILES WEST 
SOUTHWEST OF HOYT.  SPOTTERS ARE ALSO REPORTING FUNNEL CLOUDS NEAR 
FIRESTONE...IN SOUTHWEST WELD COUNTY.  

HAZARD...DAMAGING TORNADO AND PING PONG BALL SIZE HAIL. 

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. RADAR DATA ALSO SHOWS 
         STRONG ROTATION WITH THESE STORMS.  

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...
HOYT AND ADENA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. IF YOU
CANNOT SAFELY DRIVE AWAY FROM THE TORNADO...AS A LAST RESORT...EITHER
PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN
IN A LOW LYING AREA AND PROTECT YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4001 10384 3983 10426 3996 10442 4027 10422
TIME...MOT...LOC 2006Z 227DEG 22KT 3999 10421 

TORNADO...OBSERVED
HAIL...1.50IN

$$

DANKERS

705 
WWUS55 KBOU 152023
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
223 PM MDT FRI MAY 15 2015

COC001-152030-
/O.CAN.KBOU.TO.W.0013.000000T0000Z-150515T2045Z/
ADAMS CO-
223 PM MDT FRI MAY 15 2015

...THE TORNADO WARNING FOR NORTHEASTERN ADAMS COUNTY IS CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT 
OF THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT FOR NORTHEASTERN
COLORADO.

LAT...LON 4001 10384 4000 10414 4002 10438 4027 10422
TIME...MOT...LOC 2020Z 227DEG 22KT 4005 10413 

$$

COC087-123-152045-
/O.CON.KBOU.TO.W.0013.000000T0000Z-150515T2045Z/
MORGAN CO-WELD CO-
223 PM MDT FRI MAY 15 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM MDT FOR
SOUTHWESTERN MORGAN AND SOUTH CENTRAL WELD COUNTIES...
        
AT 220 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR HOYT...OR 22 MILES SOUTHWEST OF FORT 
MORGAN...MOVING NORTHEAST AT 25 MPH. STORM SPOTTERS MONITORING THIS 
STORM REPORT THAT THE TORNADO HAS DISSIPATED.  ADDITIONAL 
DEVELOPMENT OF THE STORM IS STILL POSSIBLE.

HAZARD...TORNADO AND QUARTER SIZE HAIL. 

SOURCE...WEATHER SPOTTERS REPORTED THAT THE TORNADO HAS DISSIPATED. 

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...
HOYT AND ADENA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. IF YOU
CANNOT SAFELY DRIVE AWAY FROM THE TORNADO...AS A LAST RESORT...EITHER
PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR VEHICLE AND LIE DOWN
IN A LOW LYING AREA AND PROTECT YOURSELF FROM FLYING DEBRIS.

HEAVY RAINFALL MAY HIDE ANY POSSIBLE TORNADO. DO NOT WAIT TO SEE OR 
HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 4001 10384 4000 10414 4002 10438 4027 10422
TIME...MOT...LOC 2020Z 227DEG 22KT 4005 10413 

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

$$

DANKERS

019 
WWUS55 KBOU 152035
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
235 PM MDT FRI MAY 15 2015

COC087-123-152043-
/O.CAN.KBOU.TO.W.0013.000000T0000Z-150515T2045Z/
MORGAN CO-WELD CO-
235 PM MDT FRI MAY 15 2015

...THE TORNADO WARNING FOR SOUTHWESTERN MORGAN AND SOUTH CENTRAL WELD
COUNTIES IS CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER GUSTY WINDS AND
HEAVY RAIN ARE STILL POSSIBLE WITH THIS THUNDERSTORM.

A TORNADO WARNING IS NOW IN EFFECT FOR NORTHWESTERN MORGAN COUNTY 
FOR A NEW THUNDERSTORM WHICH HAS DEVELOPED.  

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM MDT FOR NORTHEASTERN
COLORADO.

LAT...LON 4001 10384 4000 10414 4002 10438 4027 10422
TIME...MOT...LOC 2033Z 227DEG 22KT 4011 10405 

$$

DANKERS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 8:11 PM MDT	Special Weather Statement	BOU	Douglas	34 min
May 14, 8:36 PM MDT	Special Weather Statement	BOU	Denver	24 min
May 14, 11:21 PM MDT	Special Weather Statement	BOU	Morgan	39 min
May 15, 12:49 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe, Douglas	41 min
May 15, 1:21 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	27 min
May 15, 1:35 PM MDT	Tornado Warning	BOU	Adams	25 min
May 15, 1:47 PM MDT	Severe Thunderstorm Warning	BOU	Weld	28 min
May 15, 1:48 PM MDT	Severe Thunderstorm Warning	BOU	Weld	27 min
May 15, 2:10 PM MDT	Tornado Warning	BOU	Weld	50 min
May 15, 2:32 PM MDT	Tornado Warning	BOU	Morgan, Weld	43 min
May 15, 2:47 PM MDT	Tornado Warning	BOU	Weld	43 min
May 15, 5:27 PM MDT	Special Weather Statement	BOU	Morgan	48 min
May 15, 5:46 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan	29 min
May 15, 5:50 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	25 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.