Alert archive / Nebraska / Heat Advisories in 2017

Heat Advisory 3, NWS North Platte, NE

July 18, 201725 counties in Nebraska

NWS North Platte, NE issued this heat advisory at Jul 18, 2017, 2:19 PM MDT for 25 counties in Nebraska. It took effect at Jul 19, 2017, 12:00 PM MDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jul 18, 2017, 2:19 PM MDT (20:19 UTC)
In effect from: Jul 19, 2017, 12:00 PM MDT
Expired: Jul 19, 2017, 7:00 PM MDT
In force: 7 hr
Issued by: NWS North Platte, NE

All 25 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, Grant 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), 29 km from the middle of the area, began a volume at 20:22 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 12:00Z, 8.3 hours before the alert went out and 64 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: 167 J/kg
Mixed-layer CIN: -431 J/kg
Mixed-layer LCL: 981 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 275 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 18, 2:10 PM MDT, 9 minutes earlier.

Area forecast discussion, Jul 18, 2:10 PM MDT, 9 minutes before

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Hazardous weather outlook, Jul 18, 4:07 AM MDT, 10 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
507 AM CDT Tue Jul 18 2017

NEZ004>010-022>029-035>038-056>059-069>071-094-191015-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-
Grant-Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-
Logan-Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
507 AM CDT Tue Jul 18 2017 /407 AM MDT Tue Jul 18 2017/

This Hazardous Weather Outlook is for portions of western and
north central Nebraska.

.DAY ONE...TODAY AND TONIGHT.

Heat index values will exceed 100 degrees this afternoon and
early evening across far southwest Nebraska and central Nebraska.

Isolated strong to briefly severe thunderstorms are possible this
afternoon and evening, mainly along and east of a line from Lisco
to Valentine, with the best chances this evening. Large hail and
damaging winds are the main hazards.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

Heat index values will likely exceed 100 degrees Wednesday
through Thursday across parts of western Nebraska. Additional heat
advisories may be need during this time period.

Thunderstorms are forecast Wednesday and beyond with the best
chances occurring mainly in the afternoon and evening. However,
the risk of severe thunderstorms is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

Get your weather, hydrological, and climate information at
http://www.weather.gov/northplatte

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 6:18 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	57 min
Jul 17, 8:50 PM MDT	Severe Thunderstorm Warning	LBF	Sheridan	40 min
Jul 17, 9:18 PM MDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	42 min
Jul 17, 10:17 PM MDT	Special Weather Statement	LBF	Cherry	43 min
Jul 17, 10:40 PM MDT	Special Weather Statement	LBF	Cherry	50 min
Jul 17, 11:00 PM MDT	Special Weather Statement	LBF	Sheridan	45 min
Jul 18, 12:56 AM MDT	Special Weather Statement	LBF	Dawson	34 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.