Alert archive / Nebraska / Special Weather Statements in 2017

Special Weather Statement, NWS North Platte, NE

July 18, 2017Dawson County, Nebraska

NWS North Platte, NE issued this special weather statement at Jul 18, 2017, 1:56 AM CDT for Dawson County, Nebraska. It was in force for 34 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: Jul 18, 2017, 1:56 AM CDT (06:56 UTC)
Expired: Jul 18, 2017, 2:30 AM CDT
In force: 34 min
Issued by: NWS North Platte, NE

County Dawson County, NE

The radar

The Grand Island radar (KUEX), 122 km from the middle of the area, began a volume at 06:56 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, 6.9 hours before the alert went out and 93 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: 679 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1649 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

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 Jul 17, 11:34 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Jul 17, 11:34 PM CDT, 2 hours 22 minutes before

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Hazardous weather outlook, Jul 17, 3:59 PM CDT, 9 hours 57 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
359 PM CDT Mon Jul 17 2017

NEZ004>010-022>029-035>038-056>059-069>071-094-182100-
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-
359 PM CDT Mon Jul 17 2017 /259 PM MDT Mon Jul 17 2017/

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

.DAY ONE...TONIGHT.

Thunderstorms capable of heavy rainfall are possible this
evening, mainly southeast of a line from Stockville to Arnold
to Bartlett. Isolated strong to briefly severe thunderstorms
capable of hail and strong wind gusts are also possible across the
entire outlook area.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

Isolated strong to briefly severe thunderstorms will be possible
again Tuesday afternoon and evening, mainly along and north of
Interstate 80. A few storms could produce large hail and damaging
winds. Heat index values will exceed 100 degrees Tuesday afternoon
and early evening across far southwest Nebraska. Heat index
values will also likely exceed 100 degrees on Wednesday through
Thursday across parts of western Nebraska.

While thunderstorm will be possible at times Wednesday and beyond
mainly in the afternoon and evening, the risk of severe
thunderstorms is low at this time.

Thunderstorms will continue to be capable of sparking grass fires
from cloud to ground lightning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

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

Roberg

In the hours before

Local storm report, Jul 17, 10:37 PM CDT, 3 hours 19 minutes before

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Local storm report, Jul 17, 10:38 PM CDT, 3 hours 18 minutes before

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Special weather statement, Jul 17, 11:17 PM CDT, 2 hours 39 minutes before

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Special weather statement, Jul 17, 11:40 PM CDT, 2 hours 16 minutes before

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Special weather statement, Jul 18, 12:00 AM CDT, 1 hour 56 minutes before

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Special weather statement, Jul 18, 1:56 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
Jul 17, 7:18 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	57 min
Jul 17, 9:50 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	40 min
Jul 17, 10:18 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	42 min
Jul 17, 11:17 PM CDT	Special Weather Statement	LBF	Cherry	43 min
Jul 17, 11:40 PM CDT	Special Weather Statement	LBF	Cherry	50 min
Jul 18, 12:00 AM CDT	Special Weather Statement	LBF	Sheridan	45 min
Jul 18, 3:19 PM CDT	Heat Advisory	LBF	Arthur, Blaine, Boyd, Brown, Chase, Cherry and 19 more	29 hr

Nearby

Special Weather Statements in Nebraska, 2017 Every special weather statement 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.