Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 77, NWS Cheyenne, WY

July 4, 2021Scotts Bluff County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 4, 2021, 2:06 PM MDT for Scotts Bluff County, Nebraska. It was in force for 54 min. 2 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 4, 2021, 2:06 PM MDT (20:06 UTC)
Expired: Jul 4, 2021, 3:00 PM MDT
In force: 54 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Scotts Bluff County, NE

The radar

The Cheyenne radar (KCYS), 121 km from the middle of the area, began a volume at 20:08 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 4, 2:26 PM MDT	HAIL 1	1 Nw Scottsbluff, NE	REPORT RECEIVED VIA MPING.
Jul 4, 2:26 PM MDT	HAIL 1	1 Se Scottsbluff, NE	REPORT RECEIVED VIA MPING. REPORT CORRECTED FOR LOCATION.

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

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 224 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: 204 J/kg
Mixed-layer CIN: -314 J/kg
Mixed-layer LCL: 2162 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

827 
WUUS55 KCYS 042006
SVRCYS
NEC157-042100-
/O.NEW.KCYS.SV.W.0077.210704T2006Z-210704T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
206 PM MDT Sun Jul 4 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Central Scotts Bluff County in the Panhandle of Nebraska...

* Until 300 PM MDT.

* At 206 PM MDT, a severe thunderstorm was located over Scottsbluff,
  moving southwest at 10 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Terrytown around 215 PM MDT.
  Gering around 220 PM MDT.
  Scotts Bluff National Monument around 225 PM MDT.
  Hubbard Hill around 245 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4193 10367 4188 10356 4170 10364 4185 10393
TIME...MOT...LOC 2006Z 042DEG 10KT 4188 10366 

HAIL...1.00IN
WIND...60MPH
 
$$

Rubin

2 follow-up statements

797 
WWUS55 KCYS 042029
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
229 PM MDT Sun Jul 4 2021

NEC157-042100-
/O.CON.KCYS.SV.W.0077.000000T0000Z-210704T2100Z/
Scotts Bluff NE-
229 PM MDT Sun Jul 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR CENTRAL SCOTTS BLUFF COUNTY...

At 228 PM MDT, a severe thunderstorm was located over Scottsbluff,
moving southwest at 5 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe storm will be near...
  Terrytown around 245 PM MDT.
  Gering around 255 PM MDT.
  Scotts Bluff National Monument around 300 PM MDT.
  Hubbard Hill around 330 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4192 10370 4186 10357 4170 10364 4185 10393
TIME...MOT...LOC 2028Z 039DEG 5KT 4187 10367 

HAIL...1.00IN
WIND...60MPH
 
$$

Rubin

243 
WWUS55 KCYS 042053
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
253 PM MDT Sun Jul 4 2021

NEC157-042102-
/O.EXP.KCYS.SV.W.0077.000000T0000Z-210704T2100Z/
Scotts Bluff NE-
253 PM MDT Sun Jul 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL SCOTTS BLUFF COUNTY
WILL EXPIRE AT 300 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 4192 10370 4186 10357 4170 10364 4185 10393
TIME...MOT...LOC 2052Z 042DEG 10KT 4182 10373 

$$

Rubin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 3:22 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	38 min
Jul 4, 5:30 PM MDT	Special Weather Statement	CYS	Dawes	45 min
Jul 4, 5:59 PM MDT	Special Weather Statement	CYS	Morrill	46 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Every severe thunderstorm warning in 2021

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.