Alert archive / Nebraska / Special Weather Statements in 2018

Special Weather Statement, NWS North Platte, NE

August 28, 2018Keya Paha County, Nebraska

NWS North Platte, NE issued this special weather statement at Aug 28, 2018, 12:41 AM CDT for Keya Paha County, Nebraska. It was in force for 49 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 28, 2018, 12:41 AM CDT (05:41 UTC)
Expired: Aug 28, 2018, 1:30 AM CDT
In force: 49 min
Issued by: NWS North Platte, NE

County Keya Paha County, NE

The radar

The North Platte radar (KLNX), 132 km from the middle of the area, began a volume at 05:42 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, 5.7 hours before the alert went out and 210 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: 1588 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 2275 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.4

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS North Platte, NE wrote its last area forecast discussion before this special weather statement went out at Aug 27, 11:57 PM CDT, 44 minutes earlier.

Area forecast discussion, Aug 27, 11:57 PM CDT, 44 minutes before

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Hazardous weather outlook, Aug 27, 9:05 PM CDT, 3 hours 36 minutes before

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In the hours before

Special weather statement, Aug 27, 6:41 PM CDT, 6 hours before

Special Weather Statement
National Weather Service North Platte NE
641 PM CDT MON AUG 27 2018

NEZ008-280030-
Brown NE-
641 PM CDT MON AUG 27 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN BROWN COUNTY UNTIL 730
PM CDT...

At 640 PM CDT, Doppler radar was tracking a strong thunderstorm near
Johnstown, or 13 miles west of Ainsworth, moving east at 45 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Johnstown, Antelope Peak, Keller Park State Recreation Area and
Bobcat State Wildlife Management Area.

This includes the following highways...
 Highway 183 between mile markers 197 and 201.
 Highway 20 between mile markers 226 and 234.

LAT...LON 4254 10018 4263 10017 4276 9987 4260 9969
TIME...MOT...LOC 2340Z 249DEG 38KT 4259 10013

Roberg

Local storm report, Aug 27, 7:39 PM CDT, 5 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
739 PM CDT MON AUG 27 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     HAIL             3 WNW ANSELMO           41.63N 99.92W
08/27/2018  E1.00 INCH       CUSTER             NE   PUBLIC

&&

JURGENSEN

Local storm report, Aug 27, 7:44 PM CDT, 4 hours 57 minutes before

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Local storm report, Aug 27, 7:56 PM CDT, 4 hours 45 minutes before

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Special weather statement, Aug 28, 12:41 AM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 7:00 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
Aug 27, 7:43 PM CDT	Severe Thunderstorm Warning	LBF	Custer	22 min
Aug 28, 2:33 AM CDT	Special Weather Statement	LBF	Keya Paha	57 min
Aug 28, 3:04 AM CDT	Special Weather Statement	LBF	Boyd	56 min

Nearby

Special Weather Statements in Nebraska, 2018 Every special weather statement in 2018

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.