Alert archive / Nebraska / Heat Advisories in 2017

Heat Advisory 5, NWS North Platte, NE

July 20, 201724 counties in Nebraska

NWS North Platte, NE issued this heat advisory at Jul 20, 2017, 2:07 PM MDT for 24 counties in Nebraska. It took effect at Jul 21, 2017, 11:00 AM MDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 20, 2017, 2:07 PM MDT (20:07 UTC)
In effect from: Jul 21, 2017, 11:00 AM MDT
Expired: Jul 21, 2017, 7:00 PM MDT
In force: 8 hr
Issued by: NWS North Platte, NE

All 24 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, Hooker 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), 31 km from the middle of the area, began a volume at 20:07 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 (KDEN), launched 12:00Z, 8.1 hours before the alert went out and 308 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1665 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -44 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 20, 2:04 PM MDT, 3 minutes earlier.

Area forecast discussion, Jul 20, 2:04 PM MDT, 3 minutes before

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Hazardous weather outlook, Jul 20, 11:33 AM MDT, 2 hours 34 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
Jul 19, 6:14 PM MDT	Severe Thunderstorm Warning	LBF	Holt	46 min
Jul 19, 6:59 PM MDT	Severe Thunderstorm Warning	LBF	Holt	46 min
Jul 19, 7:45 PM MDT	Special Weather Statement	LBF	Holt	45 min
Jul 19, 7:48 PM MDT	Special Weather Statement	LBF	Rock	42 min
Jul 19, 7:49 PM MDT	Special Weather Statement	LBF	Hooker	56 min
Jul 19, 8:05 PM MDT	Special Weather Statement	LBF	Grant	40 min
Jul 19, 8:26 PM MDT	Special Weather Statement	LBF	Holt	49 min
Jul 19, 8:31 PM MDT	Special Weather Statement	LBF	Blaine, Garfield, Loup	44 min
Jul 19, 8:50 PM MDT	Special Weather Statement	LBF	Hooker	40 min
Jul 19, 9:17 PM MDT	Special Weather Statement	LBF	Grant	43 min
Jul 20, 1:14 AM MDT	Special Weather Statement	LBF	Cherry	31 min

Nearby

Heat Advisories in Nebraska, 2017 Every heat advisory in 2017

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.