Alert archive / Wyoming / Tornado Warnings in 2020

Tornado Warning 3, NWS Cheyenne, WY

July 19, 2020Converse County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this tornado warning at Jul 19, 2020, 6:44 PM MDT for Converse County, Niobrara County, Wyoming. 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: Jul 19, 2020, 6:44 PM MDT (00:44 UTC)
Expired: Jul 19, 2020, 7:15 PM MDT
In force: 31 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.0 in

Counties Converse County, WY, Niobrara County, WY

The radar

The Rapid City radar (KUDX), 193 km from the middle of the area, began a volume at 00:47 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 19, 6:46 PM MDT	HAIL 1.75	1 Se Dull Center, WY	LASTED LESS THAN 5 MINUTES,.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 19, 4:06 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.7 hours before the alert went out and 187 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: 31 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1904 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

884 
WFUS55 KCYS 200044
TORCYS
WYC009-027-200115-
/O.NEW.KCYS.TO.W.0003.200720T0044Z-200720T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
644 PM MDT Sun Jul 19 2020

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  West central Niobrara County in east central Wyoming...
  Northeastern Converse County in east central Wyoming...

* Until 715 PM MDT.
    
* At 643 PM MDT, a severe thunderstorm capable of producing a tornado
  was located near Dull Center, or 38 miles southeast of Wright,
  moving southeast at 35 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.

* This tornadic thunderstorm will remain over mainly rural areas of
  west central Niobrara and northeastern Converse Counties.

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 4338 10504 4341 10491 4316 10468 4309 10498
TIME...MOT...LOC 0043Z 337DEG 28KT 4336 10496 

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

$$

Brothers

2 follow-up statements

811 
WWUS55 KCYS 200050
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
650 PM MDT Sun Jul 19 2020

WYC009-027-200115-
/O.CON.KCYS.TO.W.0003.000000T0000Z-200720T0115Z/
Niobrara WY-Converse WY-
650 PM MDT Sun Jul 19 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR WEST
CENTRAL NIOBRARA AND EASTERN CONVERSE COUNTIES...
    
At 650 PM MDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Dull Center, or 41 miles southeast of
Wright, moving south at 30 mph.

HAZARD...Tornado and two inch 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 tornadic thunderstorm will remain over mainly rural areas of
west central Niobrara and eastern Converse Counties.

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 4334 10502 4337 10490 4316 10468 4309 10498
TIME...MOT...LOC 0050Z 344DEG 28KT 4330 10494 

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

$$

Brothers

710 
WWUS55 KCYS 200058
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
658 PM MDT Sun Jul 19 2020

WYC009-027-200115-
/O.CON.KCYS.TO.W.0003.000000T0000Z-200720T0115Z/
Niobrara WY-Converse WY-
658 PM MDT Sun Jul 19 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM MDT FOR WEST
CENTRAL NIOBRARA AND NORTHEASTERN CONVERSE COUNTIES...
    
At 657 PM MDT, a severe thunderstorm capable of producing a tornado
was located 10 miles south of Dull Center, or 42 miles northwest of
Lusk, moving south at 30 mph.

HAZARD...Tornado and two inch 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 tornadic thunderstorm will remain over mainly rural areas of
west central Niobrara and northeastern Converse Counties.

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 4328 10499 4331 10487 4316 10469 4309 10498
TIME...MOT...LOC 0057Z 347DEG 25KT 4326 10493 

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

$$

Brothers

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 6:02 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	58 min
Jul 19, 7:14 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	46 min
Jul 19, 7:24 PM MDT	Tornado Warning	CYS	Niobrara	36 min
Jul 19, 7:57 PM MDT	Tornado Warning	CYS	Niobrara	33 min
Jul 19, 8:03 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	42 min
Jul 19, 8:14 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	46 min
Jul 19, 8:30 PM MDT	Tornado Warning	CYS	Goshen, Niobrara	17 min
Jul 19, 8:45 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	45 min
Jul 19, 9:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	51 min
Jul 20, 12:04 PM MDT	Special Weather Statement	CYS	Platte	26 min
Jul 20, 12:51 PM MDT	Special Weather Statement	CYS	Platte	24 min
Jul 20, 1:15 PM MDT	Special Weather Statement	CYS	Albany	30 min
Jul 20, 1:27 PM MDT	Special Weather Statement	CYS	Niobrara	33 min
Jul 20, 2:27 PM MDT	Special Weather Statement	CYS	Niobrara	33 min
Jul 20, 2:53 PM MDT	Special Weather Statement	CYS	Converse, Niobrara	52 min
Jul 20, 3:45 PM MDT	Special Weather Statement	CYS	Converse	45 min
Jul 20, 4:27 PM MDT	Special Weather Statement	CYS	Converse	48 min
Jul 20, 4:52 PM MDT	Severe Thunderstorm Warning	CYS	Converse	18 min
Jul 20, 5:05 PM MDT	Special Weather Statement	CYS	Platte	40 min
Jul 20, 5:13 PM MDT	Special Weather Statement	CYS	Niobrara	47 min
Jul 20, 5:14 PM MDT	Special Weather Statement	CYS	Niobrara	46 min
Jul 20, 5:16 PM MDT	Special Weather Statement	CYS	Converse	44 min
Jul 20, 5:41 PM MDT	Special Weather Statement	CYS	Laramie	49 min

Nearby

Tornado Warnings in Wyoming, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.