Alert archive / Wyoming / Tornado Warnings in 2014

Tornado Warning 7, NWS Cheyenne, WY

May 21, 2014Platte County, Wyoming

NWS Cheyenne, WY issued this tornado warning at May 21, 2014, 7:48 PM MDT for Platte County, Wyoming. It was in force for 27 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 21, 2014, 7:48 PM MDT (01:48 UTC)
Expired: May 21, 2014, 8:15 PM MDT
In force: 27 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Platte County, WY

The radar

The Cheyenne radar (KCYS), 119 km from the middle of the area, began a volume at 01:51 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 21, 12:34 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 1.8 hours before the alert went out and 256 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: 1024 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 252 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.

045 
WFUS55 KCYS 220148
TORCYS
WYC031-220215-
/O.NEW.KCYS.TO.W.0007.140522T0148Z-140522T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
748 PM MDT WED MAY 21 2014

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL PLATTE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 815 PM MDT

* AT 745 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 7 MILES SOUTHWEST OF GUERNSEY...AND MOVING
  NORTHEAST AT 15 MPH.

  HAZARD...TORNADO AND QUARTER 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.

* THIS DANGEROUS STORM WILL BE NEAR...
  GUERNSEY AROUND 810 PM MDT.
  GUERNSEY CAMPGROUND AROUND 815 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN
CHEYENNE.

&&

LAT...LON 4219 10465 4219 10466 4215 10487 4221 10497
      4238 10479
TIME...MOT...LOC 0147Z 226DEG 14KT 4221 10486

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CLAYCOMB

2 follow-up statements

367 
WWUS55 KCYS 220207
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
807 PM MDT WED MAY 21 2014

WYC031-220215-
/O.CON.KCYS.TO.W.0007.000000T0000Z-140522T0215Z/
PLATTE WY-
807 PM MDT WED MAY 21 2014

...A TORNADO WARNING REMAINS IN EFFECT FOR EAST CENTRAL PLATTE COUNTY
UNTIL 815 PM MDT...

AT 806 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR GUERNSEY...AND MOVING NORTHEAST AT 15 MPH.

HAZARD...TORNADO AND QUARTER 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.

THIS DANGEROUS STORM WILL BE NEAR...
  GUERNSEY AND GUERNSEY CAMPGROUND AROUND 815 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO 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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN
CHEYENNE.

&&

LAT...LON 4219 10465 4219 10466 4216 10486 4222 10493
      4238 10479
TIME...MOT...LOC 0207Z 226DEG 14KT 4223 10481

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

CLAYCOMB

002 
WWUS55 KCYS 220212
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
812 PM MDT WED MAY 21 2014

WYC031-220223-
/O.EXP.KCYS.TO.W.0007.000000T0000Z-140522T0215Z/
PLATTE WY-
812 PM MDT WED MAY 21 2014

...THE TORNADO WARNING FOR EAST CENTRAL PLATTE COUNTY WILL EXPIRE AT
815 PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED ACROSS THE WARNED 
AREA.

LAT...LON 4219 10465 4219 10466 4216 10486 4222 10493
      4238 10479
TIME...MOT...LOC 0213Z 226DEG 14KT 4221 10481

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 6:23 PM MDT	Special Weather Statement	CYS	Converse	67 min
May 21, 6:36 PM MDT	Severe Thunderstorm Warning	CYS	Converse	39 min
May 21, 6:58 PM MDT	Tornado Warning	CYS	Platte	32 min
May 21, 8:04 PM MDT	Flash Flood Warning	CYS	Platte	4 hr
May 21, 11:23 PM MDT	Areal Flood Warning	CYS	Platte	9 hr
May 22, 2:19 PM MDT	Special Weather Statement	CYS	Albany	41 min
May 22, 2:47 PM MDT	Special Weather Statement	CYS		58 min
May 22, 3:42 PM MDT	Flood Watch	CYS	Albany, Carbon	5 days
May 22, 3:42 PM MDT	Flash Flood Watch	CYS	Albany, Carbon, Converse, Platte	3 days
May 22, 4:12 PM MDT	Special Weather Statement	CYS		48 min
May 22, 5:06 PM MDT	Special Weather Statement	CYS		39 min

Nearby

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