Alert archive / Nebraska / Special Weather Statements in 2021

Special Weather Statement, NWS North Platte, NE

August 25, 2021Brown County, Keya Paha County, Rock County, Nebraska

NWS North Platte, NE issued this special weather statement at Aug 25, 2021, 1:21 PM CDT for Brown County, Keya Paha County, Rock County, Nebraska. It was in force for 39 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: Aug 25, 2021, 1:21 PM CDT (18:21 UTC)
Expired: Aug 25, 2021, 2:00 PM CDT
In force: 39 min
Issued by: NWS North Platte, NE
Hail: 0.25 in
Wind: 50

Counties Brown County, NE, Keya Paha County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 119 km from the middle of the area, began a volume at 18:24 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.

What was reported inside it

Time	Report	Where	Remark
Aug 25, 2:00 PM CDT	TSTM WND GST 46	10 Se Mills, NE	PWS NE-NAPER12SW

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

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 6.4 hours before the alert went out and 194 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: 957 J/kg
Mixed-layer CIN: -382 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

584 
WWUS83 KLBF 251821
SPSLBF

Special Weather Statement
National Weather Service North Platte NE
121 PM CDT Wed Aug 25 2021
 
NEZ006>010-251900-
Brown NE-Holt NE-Rock NE-Keya Paha NE-Boyd NE-
121 PM CDT Wed Aug 25 2021

...Strong thunderstorms will impact portions of Rock, Brown,
northwestern Holt, Keya Paha and western Boyd Counties through 200 PM
CDT...

At 120 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Wewela to 6 miles south of Springview to
12 miles south of Ainsworth. Movement was east at 35 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Ainsworth, Bassett, Springview, Stuart, Long Pine, Newport, Naper,
Johnstown, Norden, Dustin, Burton, Hofeld Lake, Bobcat State Wildlife
Management Area, Twin Lakes State Wildlife Management Area, Thomas
Creek State Wildlife Management Area, Mariaville, Pine Glen State
Wildlife Refuge, Antelope Peak, Mills and Brocksburg.

This includes the following highways...
 Highway 183 between mile markers 160 and 225.
 Highway 20 between mile markers 226 and 280.
 Highway 12 between mile markers 24 and 101.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 4270 9907 4223 9930 4230 10015 4300 10017
      4300 9907
TIME...MOT...LOC 1820Z 272DEG 29KT 4300 9974 4273 9973 4237 9990 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

$$

NMJ

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 7:21 PM CDT	Special Weather Statement	LBF	Logan	39 min
Aug 24, 7:51 PM CDT	Special Weather Statement	LBF	Lincoln	39 min
Aug 24, 8:25 PM CDT	Special Weather Statement	LBF	Logan	35 min
Aug 24, 8:43 PM CDT	Special Weather Statement	LBF	Lincoln	32 min
Aug 24, 9:14 PM CDT	Special Weather Statement	LBF	Lincoln	46 min
Aug 25, 11:28 AM CDT	Special Weather Statement	LBF	Cherry	62 min
Aug 25, 12:42 PM CDT	Special Weather Statement	LBF	Keya Paha	48 min
Aug 25, 1:56 PM CDT	Special Weather Statement	LBF	Boyd, Holt, Rock	49 min
Aug 25, 2:41 PM CDT	Special Weather Statement	LBF	Boyd, Holt	49 min
Aug 25, 5:20 PM CDT	Special Weather Statement	LBF	Lincoln	40 min

Nearby

Special Weather Statements in Nebraska, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.