Alert archive / Nebraska / Heat Advisories in 2018

Heat Advisory 2, NWS North Platte, NE

June 28, 201823 counties in Nebraska

NWS North Platte, NE issued this heat advisory at Jun 28, 2018, 1:20 AM MDT for 23 counties in Nebraska. It took effect at Jun 28, 2018, 11:00 AM MDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jun 28, 2018, 1:20 AM MDT (07:20 UTC)
In effect from: Jun 28, 2018, 11:00 AM MDT
Expired: Jun 28, 2018, 7:00 PM MDT
In force: 8 hr
Issued by: NWS North Platte, NE

All 23 counties

Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Garfield County, NE, Hayes County, NE, Holt County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Rock County, NE, Thomas County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 33 km from the middle of the area, began a volume at 07:21 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, 7.3 hours before the alert went out and 63 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: 4603 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1383 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -5.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jun 27, 10:45 PM MDT, 2 hours 35 minutes earlier.

Area forecast discussion, Jun 27, 10:45 PM MDT, 2 hours 35 minutes before

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Hazardous weather outlook, Jun 28, 12:02 AM MDT, 1 hour 18 minutes before

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In the hours before

Special weather statement, Jun 28, 12:43 AM MDT, 37 minutes before

Special Weather Statement
National Weather Service North Platte NE
1243 AM MDT THU JUN 28 2018

NEZ058-069-280730-
Chase NE-Perkins NE-
1243 AM MDT THU JUN 28 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN PERKINS AND
NORTHWESTERN CHASE COUNTIES UNTIL 130 AM MDT...

At 1243 AM MDT, Doppler radar was tracking a strong thunderstorm near
Sixteen-Mile Corner, or 14 miles south of Julesburg, moving east at
20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Grant, Venango, Brandon and Wild Horse Spring.

This includes Highway 61 between mile markers 68 and 72.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4068 10205 4089 10205 4092 10172 4065 10171
TIME...MOT...LOC 0643Z 268DEG 19KT 4078 10217

CDC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 12:43 AM MDT	Special Weather Statement	LBF	Perkins	47 min
Jun 28, 2:53 AM MDT	Special Weather Statement	LBF	Thomas	52 min
Jun 28, 3:41 AM MDT	Special Weather Statement	LBF	Brown	49 min
Jun 28, 4:05 AM MDT	Special Weather Statement	LBF	Blaine	40 min
Jun 28, 4:36 AM MDT	Special Weather Statement	LBF	Loup	39 min
Jun 28, 5:02 AM MDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Loup	43 min
Jun 28, 5:32 AM MDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Wheeler	43 min
Jun 28, 4:19 PM MDT	Special Weather Statement	LBF	Sheridan	26 min
Jun 28, 4:47 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	27 min

Nearby

Heat Advisories in Nebraska, 2018 Every heat advisory 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.