Alert archive / Colorado / Tornado Warnings in 2015

Tornado Warning 5, NWS Denver/Boulder, CO

April 23, 2015Phillips County, Sedgwick County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Apr 23, 2015, 5:29 PM MDT for Phillips County, Sedgwick County, Colorado. It was in force for 31 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: Apr 23, 2015, 5:29 PM MDT (23:29 UTC)
Expired: Apr 23, 2015, 6:00 PM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

Counties Phillips County, CO, Sedgwick County, CO

The radar

The Goodland radar (KGLD), 167 km from the middle of the area, began a volume at 23:33 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
Apr 23, 5:51 PM MDT	TORNADO	3 Ne Haxtun, 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 12:00Z, 11.5 hours before the alert went out and 114 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2416 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 0 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.

141 
WFUS55 KBOU 232329
TORBOU
COC095-115-240000-
/O.NEW.KBOU.TO.W.0005.150423T2329Z-150424T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
529 PM MDT THU APR 23 2015

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN PHILLIPS COUNTY IN NORTHEASTERN COLORADO...
  SOUTHWESTERN SEDGWICK COUNTY IN NORTHEASTERN COLORADO...

* UNTIL 600 PM MDT
    
* AT 529 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR MARKS BUTTE...OR 17 MILES NORTHWEST OF
  HOLYOKE...MOVING SOUTHEAST 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...
  FAIRFIELD AND MARKS BUTTE. 

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 4065 10264 4086 10264 4086 10230 4065 10232
TIME...MOT...LOC 2329Z 295DEG 25KT 4077 10254 

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

$$

RPK

1 follow-up statement

956 
WWUS55 KBOU 232341
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
541 PM MDT THU APR 23 2015

COC095-115-240000-
/O.CON.KBOU.TO.W.0005.000000T0000Z-150424T0000Z/
PHILLIPS CO-SEDGWICK CO-
541 PM MDT THU APR 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
NORTHWESTERN PHILLIPS AND SOUTHWESTERN SEDGWICK COUNTIES...
    
AT 541 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED OVER FAIRFIELD...OR 13 MILES NORTHWEST OF HOLYOKE...
MOVING SOUTHEAST AT 25 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...
FAIRFIELD AND MARKS BUTTE. 

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 4065 10264 4086 10264 4086 10230 4065 10232
TIME...MOT...LOC 2341Z 310DEG 24KT 4074 10245 

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

$$

RPK

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 4:55 PM MDT	Special Weather Statement	BOU	Sedgwick	35 min
Apr 23, 5:05 PM MDT	Severe Thunderstorm Warning	BOU	Logan, Sedgwick	25 min
Apr 23, 5:37 PM MDT	Severe Thunderstorm Warning	BOU	Sedgwick	23 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; radar from the NEXRAD Level II archive.