Alert archive / Nebraska / Special Weather Statements in 2021

Special Weather Statement, NWS Cheyenne, WY

August 7, 2021Cheyenne County, Kimball County, Nebraska

NWS Cheyenne, WY issued this special weather statement at Aug 7, 2021, 1:21 AM MDT for Cheyenne County, Kimball County, Nebraska. It was in force for 39 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
Aug 7, 2021, 1:21 AM MDT (07:21 UTC)
Expired
Aug 7, 2021, 2:00 AM MDT
In force
39 min
Issued by
NWS Cheyenne, WY
Hail
0.00 in
Wind
50

Counties Cheyenne County, NE, Kimball County, NE

The radar

The Cheyenne radar (KCYS), 150 km from the middle of the area, began a volume at 07:24 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

Denver, CO (KDNR), launched 00:00Z, 7.4 hours before the alert went out and 152 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2021-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2021-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
4 J/kg
Mixed-layer CIN
-256 J/kg
Mixed-layer LCL
3329 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

782 
WWUS85 KCYS 070721
SPSCYS

Special Weather Statement
National Weather Service Cheyenne WY
121 AM MDT Sat Aug 7 2021
 
NEZ021-054-055-070800-
Kimball NE-Cheyenne NE-Morrill NE-
121 AM MDT Sat Aug 7 2021

...Showers with strong winds will impact portions of Cheyenne, 
Kimball and southeastern Morrill Counties through 200 AM MDT...

At 120 AM MDT, Doppler radar was tracking showers with strong winds 
along a line extending from 10 miles north of Lisco to 8 miles east 
of Gurley to 7 miles northeast of Potter to 9 miles south of Kimball 
Airport. Movement was northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Sidney, Kimball, Potter, Lodgepole, Dalton, Dix, Gurley, Sunol,
Brownson, Colton, Lorenzo, Oliver Reservoir, Kimball Airport and
Sidney Airport.

This includes Interstate 80 in Nebraska between mile markers 8 and
76.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4100 10263 4100 10400 4116 10400 4164 10263
      4142 10264 4139 10261
TIME...MOT...LOC 0720Z 239DEG 25KT 4165 10266 4132 10281 4129 10321
4104 10366

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

$$

Hammer

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 12:34 AM MDTSpecial Weather StatementCYSCheyenne, Kimball, Morrill41 min

Nearby

Special Weather Statements in Nebraska, 2021Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.