Alert archive / Colorado / Tornado Warnings in 2016

Tornado Warning 24, NWS Denver/Boulder, CO

July 17, 2016Logan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 17, 2016, 6:11 PM MDT for Logan County, Weld County, Colorado. It was in force for 34 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: Jul 17, 2016, 6:11 PM MDT (00:11 UTC)
Expired: Jul 17, 2016, 6:45 PM MDT
In force: 34 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.75 in

Counties Logan County, CO, Weld County, CO

The radar

The Cheyenne radar (KCYS), 107 km from the middle of the area, began a volume at 00:11 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 17, 6:20 PM MDT	TSTM WND GST 73	2 Nw Stoneham, CO

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 00:00Z, 0.2 hours before the alert went out and 98 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: 697 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 2716 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 128 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

045 
WFUS55 KBOU 180011
TORBOU
COC075-123-180045-
/O.NEW.KBOU.TO.W.0024.160718T0011Z-160718T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
611 PM MDT SUN JUL 17 2016

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL WELD COUNTY IN NORTHEASTERN COLORADO...
  WEST CENTRAL LOGAN COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 645 PM MDT
    
* AT 610 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 4 MILES NORTHWEST OF STONEHAM...OR 26 MILES
  WEST OF STERLING...MOVING SOUTHEAST AT 25 MPH.  ANOTHER POSSIBLE
  TORNADO WAS LOCATED JUST NORTHWEST OF NEW RAYMER AS WELL.

  HAZARD...TORNADO AND BASEBALL 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...
  STONEHAM AND NEW RAYMER. 

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 4077 10350 4052 10354 4053 10404 4077 10394
TIME...MOT...LOC 0010Z 303DEG 20KT 4066 10373 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

RPK

2 follow-up statements

824 
WWUS55 KBOU 180032
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
632 PM MDT SUN JUL 17 2016

COC075-123-180045-
/O.CON.KBOU.TO.W.0024.000000T0000Z-160718T0045Z/
WELD CO-LOGAN CO-
632 PM MDT SUN JUL 17 2016

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR EASTERN
WELD AND WEST CENTRAL LOGAN COUNTIES...
    
AT 632 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 4 MILES SOUTHEAST OF STONEHAM...OR 21 MILES WEST OF
STERLING...MOVING SOUTHEAST AT 25 MPH.

HAZARD...TORNADO AND TENNIS 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...
STONEHAM AND NEW RAYMER. 

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 4052 10354 4053 10388 4073 10382 4072 10351
TIME...MOT...LOC 0032Z 311DEG 20KT 4058 10361 

TORNADO...RADAR INDICATED
HAIL...2.50IN

$$

RPK

406 
WWUS55 KBOU 180045
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
645 PM MDT SUN JUL 17 2016

COC075-123-180053-
/O.EXP.KBOU.TO.W.0024.000000T0000Z-160718T0045Z/
WELD CO-LOGAN CO-
645 PM MDT SUN JUL 17 2016

...THE TORNADO WARNING FOR EASTERN WELD AND WEST CENTRAL LOGAN
COUNTIES WILL EXPIRE AT 645 PM MDT...
    
THE TORNADO THREAT HAS DIMINISHED AND THE TORNADO WARNING HAS BEEN
CANCELLED. 

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR
EASTERN WELD COUNTY IN NORTHEASTERN COLORADO...NORTHEASTERN MORGAN
COUNTY IN NORTHEASTERN COLORADO AND SOUTHWESTERN LOGAN COUNTY IN
NORTHEASTERN COLORADO UNTIL 730 PM MDT.


LAT...LON 4052 10354 4053 10388 4073 10382 4072 10351
TIME...MOT...LOC 0042Z 303DEG 20KT 4058 10361 

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 6:42 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Morgan, Weld	48 min
Jul 17, 7:18 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	42 min
Jul 17, 7:20 PM MDT	Severe Thunderstorm Warning	BOU	Washington	40 min
Jul 17, 7:27 PM MDT	Areal Flood Advisory	BOU	Logan, Morgan	2 hr
Jul 17, 7:45 PM MDT	Flash Flood Warning	BOU	Logan, Weld	2 hr
Jul 17, 7:49 PM MDT	Severe Thunderstorm Warning	BOU	Elbert, Lincoln	56 min
Jul 17, 8:07 PM MDT	Special Weather Statement	BOU	Logan	38 min
Jul 17, 8:19 PM MDT	Severe Thunderstorm Warning	BOU	Washington	26 min
Jul 17, 8:44 PM MDT	Areal Flood Advisory	BOU	Washington	2 hr
Jul 17, 9:14 PM MDT	Special Weather Statement	BOU	Adams	46 min
Jul 17, 9:25 PM MDT	Severe Thunderstorm Warning	BOU	Adams	50 min
Jul 17, 9:49 PM MDT	Flash Flood Warning	BOU	Adams	3 hr
Jul 17, 10:04 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
Jul 17, 10:44 PM MDT	Severe Thunderstorm Warning	BOU	Weld	24 min
Jul 17, 10:49 PM MDT	Areal Flood Advisory	BOU	Weld	3 hr
Jul 17, 11:10 PM MDT	Severe Thunderstorm Warning	BOU	Weld	29 min
Jul 18, 1:18 PM MDT	Special Weather Statement	BOU	Douglas	42 min
Jul 18, 3:33 PM MDT	Severe Thunderstorm Warning	BOU	Weld	42 min
Jul 18, 4:16 PM MDT	Special Weather Statement	BOU	Weld	44 min
Jul 18, 4:48 PM MDT	Special Weather Statement	BOU	Weld	42 min
Jul 18, 4:51 PM MDT	Special Weather Statement	BOU	Weld	39 min
Jul 18, 5:02 PM MDT	Severe Thunderstorm Warning	BOU	Weld	43 min
Jul 18, 5:19 PM MDT	Severe Thunderstorm Warning	BOU	Weld	41 min
Jul 18, 5:22 PM MDT	Areal Flood Advisory	BOU	Weld	3 hr
Jul 18, 5:33 PM MDT	Areal Flood Advisory	BOU	Douglas	117 min
Jul 18, 5:38 PM MDT	Areal Flood Advisory	BOU	Weld	3 hr
Jul 18, 5:49 PM MDT	Areal Flood Advisory	BOU	Boulder	56 min

Nearby

Tornado Warnings in Colorado, 2016 Every tornado warning in 2016 Tornadoes in 2016

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.