Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 80, NWS Denver/Boulder, CO

July 28, 2014Adams County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 28, 2014, 3:50 PM MDT for Adams County, Weld County, Colorado. It was in force for 25 min. 2 reports 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: Jul 28, 2014, 3:50 PM MDT (21:50 UTC)
Expired: Jul 28, 2014, 4:15 PM MDT
In force: 25 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Adams County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 36 km from the middle of the area, began a volume at 21:54 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
Jul 28, 3:53 PM MDT	TORNADO	2 S Fort Lupton, CO	CORRECTION TO LOCATION. TOUCHDOWN WAS NORTH OF WELD COUNTY LINE IN WELD COUNTY. BRIEF TOUCHDOWN WITH NO DAMAGE REPORTED. NOTED AS A TOUCHDOWN BY DIA OBSERVER AT 2153Z OBS.
Jul 28, 3:53 PM MDT	TORNADO	2 S Fort Lupton, CO	CORRECTION TO LOCATION. TOUCHDOWN WAS NORTH OF WELD COUNTY LINE IN WELD COUNTY. BRIEF TOUCHDOWN WITH NO DAMAGE REPORTED. NOTED AS A TOUCHDOWN BY DIA OBSERVER AT 2353Z OBS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 9.8 hours before the alert went out and 133 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: 1 J/kg
Mixed-layer CIN: -392 J/kg
Mixed-layer LCL: 1653 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 38 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.

167 
WFUS55 KBOU 282150
TORBOU
COC001-123-282215-
/O.NEW.KBOU.TO.W.0080.140728T2150Z-140728T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
350 PM MDT MON JUL 28 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN WELD COUNTY IN NORTHEAST COLORADO...
  NORTHWESTERN ADAMS COUNTY IN NORTHEAST COLORADO...

* UNTIL 415 PM MDT
    
* AT 349 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR FORT LUPTON...OR 23 MILES SOUTH OF
  GREELEY...MOVING NORTHWEST AT 5 MPH.

  HAZARD...TORNADO. 

  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...
  BRIGHTON...FORT LUPTON AND LOCHBUIE. 

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 4000 10482 4011 10485 4016 10472 4000 10466
TIME...MOT...LOC 2149Z 153DEG 7KT 4008 10476 

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

$$

RJK

2 follow-up statements

874 
WWUS55 KBOU 282157
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
357 PM MDT MON JUL 28 2014

COC001-123-282215-
/O.CON.KBOU.TO.W.0080.000000T0000Z-140728T2215Z/
WELD CO-ADAMS CO-
357 PM MDT MON JUL 28 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR SOUTHERN
WELD AND NORTHWESTERN ADAMS COUNTIES...
    
AT 356 PM MDT...A CONFIRMED TORNADO WAS LOCATED 1 MILE SOUTH OF FORT 
LUPTON...OR 24 MILES NORTH OF DENVER...AND IS NEARLY STATIONARY.

HAZARD...DAMAGING TORNADO. 

SOURCE...WEATHER SPOTTERS CONFIRMED TORNADO. 

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...
BRIGHTON...FORT LUPTON AND LOCHBUIE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW! MOVE TO A
BASEMENT OR AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4010 10485 4011 10472 4000 10466 4000 10482
TIME...MOT...LOC 2156Z 305DEG 1KT 4006 10479 

TORNADO...OBSERVED
HAIL...<.75IN

$$

RJK

238 
WWUS55 KBOU 282213
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
413 PM MDT MON JUL 28 2014

COC001-123-282223-
/O.EXP.KBOU.TO.W.0080.000000T0000Z-140728T2215Z/
WELD CO-ADAMS CO-
413 PM MDT MON JUL 28 2014

...THE TORNADO WARNING FOR SOUTHERN WELD AND NORTHWESTERN ADAMS
COUNTIES WILL EXPIRE AT 415 PM MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER IS OF PRODUCING A TORNADO. THEREFORE THE 
WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4010 10485 4011 10472 4000 10466 4000 10482
TIME...MOT...LOC 2210Z 153DEG 7KT 4006 10479 

$$

RJK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 6:11 PM MDT	Areal Flood Advisory	BOU	Douglas, Elbert	94 min
Jul 27, 6:53 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe	97 min
Jul 27, 11:06 PM MDT	Areal Flood Advisory	BOU	Lincoln	114 min
Jul 28, 1:22 PM MDT	Flash Flood Warning	BOU	Grand, Larimer	3 hr
Jul 28, 1:37 PM MDT	Flash Flood Watch	BOU	Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 13 more	52 hr
Jul 28, 4:02 PM MDT	Tornado Warning	BOU	Adams, Denver	28 min
Jul 28, 4:20 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver	3 hr
Jul 28, 4:38 PM MDT	Areal Flood Advisory	BOU	Adams	2 hr
Jul 28, 5:22 PM MDT	Areal Flood Advisory	BOU	Adams	113 min

Nearby

Tornado Warnings in Colorado, 2014 Every tornado warning in 2014 Tornadoes in 2014

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.