Alert archive / Nebraska / Tornado Warnings in 2020

Tornado Warning 2, NWS Cheyenne, WY

July 2, 2020Box Butte County, Dawes County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jul 2, 2020, 5:14 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 46 min. 4 reports 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 2, 2020, 5:14 PM MDT (23:14 UTC)
Expired: Jul 2, 2020, 6:00 PM MDT
In force: 46 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.75 in

Counties Box Butte County, NE, Dawes County, NE

The radar

The Rapid City radar (KUDX), 192 km from the middle of the area, began a volume at 23:16 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 2, 5:15 PM MDT	HAIL 2.75	4 Ene Marsland, NE	NWS DAMAGE SURVEY CONFIRMED BASEBALL SIZED HAIL AT A RANCH RESIDENCE. TIME ESTIMATED BASED ON RADAR.
Jul 2, 5:26 PM MDT	TORNADO	9 Nnw Hemingford, NE	CORRECTED LOCATION.
Jul 2, 5:28 PM MDT	TORNADO	3 E Marsland, NE	TREE DAMAGE, CENTER PIVOT DAMAGE, AND THREE STEEL UTILITY POLES DOWN.
Jul 2, 5:30 PM MDT	TORNADO	3 Ene Marsland, NE	NWS DAMAGE SURVEY CONFIRMED EF-2 TORNADO BETWEEN 526-535 PM MDT ON 7/2/20. TORNADO DEVELOPED 5.8 E MARSLAND AND TRAVELED WNW FOR 3.4 MILES. SEVERAL LARGE HARDWOOD TREE TRUNKS/BRANCHES SNAPPED. TREES UPROOTED. CENTER PIVOT MANGLED. 3 STEEL POWER POLES BENT AT B

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

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.2 hours before the alert went out and 186 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: 1543 J/kg
Mixed-layer CIN: -273 J/kg
Mixed-layer LCL: 1698 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

509 
WFUS55 KCYS 022314
TORCYS
NEC013-045-030000-
/O.NEW.KCYS.TO.W.0002.200702T2314Z-200703T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
514 PM MDT Thu Jul 2 2020

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  North central Box Butte County in the Panhandle of Nebraska...
  Southeastern Dawes County in the Panhandle of Nebraska...

* Until 600 PM MDT.
    
* At 513 PM MDT, a severe thunderstorm capable of producing a tornado
  was located over Box Butte Campground, or 27 miles south of
  Chadron, moving southeast at 10 mph.

  HAZARD...Tornado and baseball 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...
  Box Butte Campground around 530 PM MDT.
  Box Butte Dam around 540 PM MDT.
  Hemingford around 600 PM MDT.

Other locations impacted by this tornadic thunderstorm include
Marsland.

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 4220 10302 4246 10332 4258 10322 4251 10277
      4245 10277
TIME...MOT...LOC 2313Z 303DEG 7KT 4245 10316 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

Hammer

3 follow-up statements

294 
WWUS55 KCYS 022331
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
531 PM MDT Thu Jul 2 2020

NEC013-045-030000-
/O.CON.KCYS.TO.W.0002.000000T0000Z-200703T0000Z/
Box Butte NE-Dawes NE-
531 PM MDT Thu Jul 2 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR NORTH
CENTRAL BOX BUTTE AND SOUTHEASTERN DAWES COUNTIES...
    
At 530 PM MDT, a confirmed tornado was located over Box Butte Dam, or
25 miles northwest of Alliance, moving southeast at 10 mph.

HAZARD...Damaging tornado and baseball size hail.

SOURCE...Weather spotters 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.

This tornado will be near...
  Hemingford around 555 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 outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4220 10302 4247 10325 4257 10315 4251 10277
      4245 10277
TIME...MOT...LOC 2330Z 300DEG 8KT 4243 10309 

TORNADO...OBSERVED
HAIL...2.75IN

$$

Hammer

673 
WWUS55 KCYS 022342
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
542 PM MDT Thu Jul 2 2020

NEC013-045-030000-
/O.CON.KCYS.TO.W.0002.000000T0000Z-200703T0000Z/
Box Butte NE-Dawes NE-
542 PM MDT Thu Jul 2 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR NORTH
CENTRAL BOX BUTTE AND SOUTHEASTERN DAWES COUNTIES...
    
At 541 PM MDT, a confirmed tornado was located near Box Butte Dam, or
23 miles southwest of Hay Springs, moving southeast at 15 mph.

HAZARD...Damaging tornado and golf ball size hail.

SOURCE...Weather spotters confirmed tornado. 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 tornadic thunderstorm will remain over mainly rural areas of
north central Box Butte and southeastern Dawes Counties.

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 outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4225 10297 4250 10319 4257 10315 4251 10277
      4245 10277
TIME...MOT...LOC 2341Z 297DEG 13KT 4244 10302 

TORNADO...OBSERVED
HAIL...1.75IN

$$

Hammer

810 
WWUS55 KCYS 022358
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
558 PM MDT Thu Jul 2 2020

NEC013-045-030008-
/O.EXP.KCYS.TO.W.0002.000000T0000Z-200703T0000Z/
Box Butte NE-Dawes NE-
558 PM MDT Thu Jul 2 2020

...THE TORNADO WARNING FOR NORTH CENTRAL BOX BUTTE AND SOUTHEASTERN
DAWES COUNTIES WILL EXPIRE AT 600 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.  However small hail
and gusty winds are still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.

LAT...LON 4225 10297 4250 10319 4257 10315 4251 10277
      4245 10277
TIME...MOT...LOC 2358Z 303DEG 7KT 4243 10299 

$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 2:44 PM MDT	Special Weather Statement	CYS	Sioux	46 min
Jul 2, 3:24 PM MDT	Special Weather Statement	CYS	Dawes	51 min
Jul 2, 3:29 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	46 min
Jul 2, 3:38 PM MDT	Special Weather Statement	CYS	Morrill	52 min
Jul 2, 4:12 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	48 min
Jul 2, 4:21 PM MDT	Special Weather Statement	CYS	Cheyenne	39 min
Jul 2, 4:41 PM MDT	Special Weather Statement	CYS	Morrill	49 min
Jul 2, 4:48 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	42 min
Jul 2, 4:59 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	61 min

Nearby

Tornado Warnings in Nebraska, 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.