Alert archive / Wyoming / Tornado Warnings in 2015

Tornado Warning 6, NWS Cheyenne, WY

May 23, 2015Albany County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 23, 2015, 1:08 PM MDT for Albany County, Wyoming. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 23, 2015, 1:08 PM MDT (19:08 UTC)
Expired: May 23, 2015, 1:45 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 109 km from the middle of the area, began a volume at 19:09 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.

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.1 hours before the alert went out and 257 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: 824 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -53 m²/s²
0-3 km storm-relative helicity: -15 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.

999 
WFUS55 KCYS 231908
TORCYS
WYC001-231945-
/O.NEW.KCYS.TO.W.0006.150523T1908Z-150523T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
108 PM MDT SAT MAY 23 2015

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL ALBANY COUNTY IN SOUTHEASTERN WYOMING...

* UNTIL 145 PM MDT

* AT 107 PM MDT...A CONFIRMED TORNADO WAS LOCATED 10 MILES WEST OF
  BOSLER...OR 23 MILES NORTHWEST OF LARAMIE...MOVING NORTHWEST AT 15
  MPH.

  HAZARD...TORNADO. 

  SOURCE...PUBLIC 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. 

* THE TORNADO WILL BE NEAR...
  ROCK RIVER AROUND 145 PM MDT.

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

&&

LAT...LON 4157 10608 4178 10607 4185 10586 4153 10570
      4145 10595
TIME...MOT...LOC 1907Z 152DEG 14KT 4156 10589 

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

$$

HAMMER

2 follow-up statements

566 
WWUS55 KCYS 231921
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
121 PM MDT SAT MAY 23 2015

WYC001-231945-
/O.CON.KCYS.TO.W.0006.000000T0000Z-150523T1945Z/
ALBANY WY-
121 PM MDT SAT MAY 23 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM MDT FOR CENTRAL
ALBANY COUNTY...
    
AT 120 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED 9 MILES SOUTH OF ROCK RIVER...OR 27 MILES NORTHWEST OF
LARAMIE...MOVING NORTHWEST AT 15 MPH.

HAZARD...POSSIBLE TORNADO. 

SOURCE...RADAR INDICATED ROTATION. THIS STORM HAS A HISTORY OF 
PRODUCING TORNADOES. 

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. 

THIS DANGEROUS STORM WILL BE NEAR...
  ROCK RIVER AROUND 145 PM MDT.

LAT...LON 4157 10608 4178 10607 4183 10592 4156 10586
      4153 10603
TIME...MOT...LOC 1920Z 147DEG 14KT 4160 10596 

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

$$

HAMMER

697 
WWUS55 KCYS 231939
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
139 PM MDT SAT MAY 23 2015

WYC001-231949-
/O.EXP.KCYS.TO.W.0006.000000T0000Z-150523T1945Z/
ALBANY WY-
139 PM MDT SAT MAY 23 2015

...THE TORNADO WARNING FOR CENTRAL ALBANY COUNTY WILL EXPIRE AT 145
PM MDT...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER APPEARS CAPABLE OF PRODUCING A TORNADO.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.

LAT...LON 4157 10608 4178 10607 4183 10592 4156 10586
      4153 10603
TIME...MOT...LOC 1938Z 152DEG 14KT 4160 10596 

$$

HAMMER

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 23, 12:01 PM MDT	Special Weather Statement	CYS	Carbon	44 min
May 23, 12:36 PM MDT	Special Weather Statement	CYS	Carbon	39 min
May 23, 12:56 PM MDT	Special Weather Statement	CYS	Albany	49 min
May 23, 2:02 PM MDT	Flash Flood Watch	CYS	Albany, Carbon, Converse, Goshen, Laramie, Platte	28 hr
May 23, 2:22 PM MDT	Special Weather Statement	CYS	Platte	38 min
May 23, 4:47 PM MDT	Special Weather Statement	CYS	Platte	43 min
May 23, 5:24 PM MDT	Areal Flood Warning	CYS	Albany, Platte	12 hr

Nearby

Tornado Warnings in Wyoming, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.