Alert archive / Nebraska / Special Weather Statements in 2020

Special Weather Statement, NWS North Platte, NE

June 18, 2020Keya Paha County, Nebraska

NWS North Platte, NE issued this special weather statement at Jun 18, 2020, 1:21 AM CDT for Keya Paha County, Nebraska. It was in force for 24 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: Jun 18, 2020, 1:21 AM CDT (06:21 UTC)
Expired: Jun 18, 2020, 1:45 AM CDT
In force: 24 min
Issued by: NWS North Platte, NE

County Keya Paha County, NE

The radar

The North Platte radar (KLNX), 87 km from the middle of the area, began a volume at 06:21 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 6.4 hours before the alert went out and 179 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: 1871 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 2589 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted.

684 
WWUS83 KLBF 180621
SPSLBF

Special Weather Statement
National Weather Service North Platte NE
121 AM CDT Thu Jun 18 2020
 
NEZ005-006-008-180645-
Brown NE-Eastern Cherry NE-Keya Paha NE-
121 AM CDT Thu Jun 18 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHERRY...
NORTHWESTERN BROWN AND WEST CENTRAL KEYA PAHA COUNTIES UNTIL 145 AM
CDT...

At 120 AM CDT, Doppler radar was tracking a strong thunderstorm 11
miles south of Valentine, moving northeast at 45 mph.

Penny size hail and Winds in excess of 40 mph will be possible with 
this storm.

Locations impacted include...
Sparks, Smith Falls State Park and Schlagel Creek State Wildlife
Management Area.

This includes the following highways...
 Highway 20 between mile markers 199 and 216.
 Highway 83 between mile markers 193 and 207.
 Highway 12 near mile marker 3, and between mile markers 9 and 16.

LAT...LON 4257 10051 4273 10066 4300 10038 4281 10006
TIME...MOT...LOC 0620Z 228DEG 38KT 4271 10048 

$$

Gomez

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:00 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	45 min
Jun 17, 7:15 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	45 min
Jun 17, 7:23 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Grant, Hooker	52 min
Jun 17, 7:36 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	39 min
Jun 17, 8:05 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	40 min
Jun 17, 8:07 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	38 min
Jun 17, 8:13 PM CDT	Special Weather Statement	LBF	Grant	47 min
Jun 17, 8:50 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Grant, Hooker	40 min
Jun 17, 9:06 PM CDT	Special Weather Statement	LBF	Cherry	39 min
Jun 17, 9:33 PM CDT	Special Weather Statement	LBF	Keya Paha	12 min
Jun 17, 9:34 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Grant, Hooker	41 min
Jun 17, 10:01 PM CDT	Special Weather Statement	LBF	Cherry	44 min
Jun 17, 10:17 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	43 min
Jun 17, 10:22 PM CDT	Special Weather Statement	LBF	Grant	38 min
Jun 17, 10:40 PM CDT	Areal Flood Advisory	LBF	Brown, Cherry, Keya Paha	6 hr
Jun 17, 10:56 PM CDT	Special Weather Statement	LBF	Keya Paha	49 min
Jun 17, 11:02 PM CDT	Special Weather Statement	LBF	Cherry	43 min
Jun 17, 11:18 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	42 min
Jun 17, 11:49 PM CDT	Special Weather Statement	LBF	Keya Paha	26 min
Jun 18, 12:03 AM CDT	Special Weather Statement	LBF	Cherry	12 min
Jun 18, 12:15 AM CDT	Special Weather Statement	LBF	Cherry	15 min
Jun 18, 12:37 AM CDT	Special Weather Statement	LBF	Keya Paha	38 min
Jun 18, 1:14 AM CDT	Areal Flood Advisory	LBF	Cherry	3 hr

Nearby

Special Weather Statements in Nebraska, 2020 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.