Alert archive / Colorado / Tornado Warnings in 2014

Tornado Warning 78, NWS Denver/Boulder, CO

July 11, 2014Logan County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jul 11, 2014, 5:20 PM MDT for Logan County, Colorado. It was in force for 25 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 11, 2014, 5:20 PM MDT (23:20 UTC)
Expired: Jul 11, 2014, 5:45 PM MDT
In force: 25 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

County Logan County, CO

The radar

The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 23:20 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 11, 5:34 PM MDT	HAIL 1.25	4 Sw Padroni, CO	STERLING RESERVOIR

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, 11.3 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: 22 J/kg
Mixed-layer CIN: -363 J/kg
Mixed-layer LCL: 1696 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 31 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.

035 
WFUS55 KBOU 112320
TORBOU
COC075-112345-
/O.NEW.KBOU.TO.W.0078.140711T2320Z-140711T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
520 PM MDT FRI JUL 11 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN LOGAN COUNTY IN NORTHEAST COLORADO...

* UNTIL 545 PM MDT
    
* AT 520 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR NORTH STERLING RESERVOIR...OR 10 MILES
  NORTHWEST OF STERLING...MOVING EAST AT 20 MPH.

  HAZARD...TORNADO AND HAIL UP TO TWO INCHES IN DIAMETER. 

  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...
  NORTHERN STERLING...NORTH STERLING RESERVOIR AND PADRONI. 

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

&&

LAT...LON 4064 10340 4091 10340 4092 10310 4064 10309
TIME...MOT...LOC 2320Z 268DEG 18KT 4077 10334 

TORNADO...RADAR INDICATED
HAIL...2.00IN

$$

RPK

2 follow-up statements

972 
WWUS55 KBOU 112325
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
525 PM MDT FRI JUL 11 2014

COC075-112345-
/O.CON.KBOU.TO.W.0078.000000T0000Z-140711T2345Z/
LOGAN CO-
525 PM MDT FRI JUL 11 2014

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM MDT FOR
NORTHWESTERN LOGAN COUNTY...
    
AT 524 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER NORTH STERLING RESERVOIR...OR 8 MILES NORTH OF
STERLING...MOVING EAST 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...
NORTHERN STERLING...NORTH STERLING RESERVOIR AND PADRONI. 

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 IN A MOBILE HOME...A
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER 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 4064 10340 4091 10340 4092 10310 4064 10309
TIME...MOT...LOC 2324Z 268DEG 22KT 4077 10327 

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

$$

RPK

915 
WWUS55 KBOU 112346
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
546 PM MDT FRI JUL 11 2014

COC075-112355-
/O.EXP.KBOU.TO.W.0078.000000T0000Z-140711T2345Z/
LOGAN CO-
546 PM MDT FRI JUL 11 2014

...THE TORNADO WARNING FOR NORTHWESTERN LOGAN COUNTY HAS EXPIRED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

REMEMBER...A SEVERE THUNDERSTORM WARNING STILL REMAINS IN EFFECT FOR 
CENTRAL LOGAN COUNTY UNTIL 645 PM MDT. 
**!

LAT...LON 4064 10340 4091 10340 4092 10310 4064 10309
TIME...MOT...LOC 2345Z 268DEG 18KT 4077 10327 

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 1:13 PM MDT	Areal Flood Advisory	BOU	Larimer	2 hr
Jul 11, 3:11 PM MDT	Areal Flood Advisory	BOU	Douglas	3 hr
Jul 11, 3:35 PM MDT	Areal Flood Advisory	BOU	Adams, Denver, Weld	115 min
Jul 11, 3:49 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver	116 min
Jul 11, 4:20 PM MDT	Areal Flood Advisory	BOU	Adams, Arapahoe, Denver, Jefferson	3 hr
Jul 11, 4:46 PM MDT	Areal Flood Advisory	BOU	Elbert	119 min
Jul 11, 4:46 PM MDT	Special Weather Statement	BOU	Logan	29 min
Jul 11, 4:51 PM MDT	Severe Thunderstorm Warning	BOU	Logan	24 min
Jul 11, 4:54 PM MDT	Areal Flood Advisory	BOU	Adams, Morgan, Weld	2 hr
Jul 11, 5:02 PM MDT	Areal Flood Advisory	BOU	Larimer	118 min
Jul 11, 5:14 PM MDT	Severe Thunderstorm Warning	BOU	Logan	31 min
Jul 11, 5:44 PM MDT	Severe Thunderstorm Warning	BOU	Logan	31 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.