Alert archive / Nebraska / Special Weather Statements in 2017

Special Weather Statement, NWS North Platte, NE

August 25, 2017Keya Paha County, Nebraska

NWS North Platte, NE issued this special weather statement at Aug 25, 2017, 5:02 PM CDT for Keya Paha County, Nebraska. It was in force for 43 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 25, 2017, 5:02 PM CDT (22:02 UTC)
Expired: Aug 25, 2017, 5:45 PM CDT
In force: 43 min
Issued by: NWS North Platte, NE

County Keya Paha County, NE

The radar

The North Platte radar (KLNX), 117 km from the middle of the area, began a volume at 22:04 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, 10.0 hours before the alert went out and 206 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: 1273 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 1120 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 25, 3:10 PM CDT, 1 hour 52 minutes earlier.

Area forecast discussion, Aug 25, 3:10 PM CDT, 1 hour 52 minutes before

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</head>
<body>
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Hazardous weather outlook, Aug 25, 3:48 PM CDT, 1 hour 14 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
348 PM CDT Fri Aug 25 2017

NEZ004>010-022>029-035>038-056>059-069>071-094-262100-
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-
348 PM CDT Fri Aug 25 2017 /248 PM MDT Fri Aug 25 2017/

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

.DAY ONE...TONIGHT.

Thunderstorms are possible this evening across the outlook area.

Thunderstorms are possible across western and north central
Nebraska tonight, mainly east of highway 61. There is a threat for
severe storms east of highway 83 from Valentine to Thedford and
north of a line from Thedford to Bartlett. Large hail and damaging
winds are the main severe threats. In addition, heavy rain is
possible as well.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

A marginal risk for severe storms across the entire outlook area
on Saturday. Timing favors the evening hours. A few storms could
be strong or briefly severe. The hazards are large hail, wind
damage and locally heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation should not be needed through tonight.

&&

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

CLB

In the hours before

Special weather statement, Aug 25, 4:33 PM CDT, 29 minutes before

Special Weather Statement
National Weather Service North Platte NE
433 PM CDT FRI AUG 25 2017

NEZ005-252215-
Eastern Cherry NE-
433 PM CDT FRI AUG 25 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHERRY COUNTY UNTIL
515 PM CDT...

At 432 PM CDT, Doppler radar was tracking a strong thunderstorm near
Littleburg, or 7 miles northeast of Valentine, moving east at 20 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Sparks and Smith Falls State Park.

This includes the following highways...
 Highway 83 between mile markers 216 and 222.
 Highway 12 between mile markers 4 and 22.

LAT...LON 4288 10020 4289 10056 4300 10067 4300 10020
TIME...MOT...LOC 2132Z 261DEG 19KT 4296 10048

CDC

Special weather statement, Aug 25, 5:02 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service North Platte NE
502 PM CDT FRI AUG 25 2017

NEZ005-006-252245-
Eastern Cherry NE-Keya Paha NE-
502 PM CDT FRI AUG 25 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN CHERRY AND
NORTHWESTERN KEYA PAHA COUNTIES UNTIL 545 PM CDT...

At 501 PM CDT, Doppler radar was tracking a strong thunderstorm 9
miles southwest of Keyapaha, or 18 miles northeast of Valentine,
moving east at 10 mph.

1 inch of rainfall and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Sparks and Smith Falls State Park.

This includes Highway 12 between mile markers 12 and 25.

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.

&&

A severe thunderstorm watch remains in effect until 1100 PM CDT for
north central Nebraska.

LAT...LON 4300 9979 4290 9994 4288 10020 4289 10036
      4300 10041
TIME...MOT...LOC 2201Z 270DEG 9KT 4298 10022

CDC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 7:02 PM CDT	Special Weather Statement	LBF	Holt	43 min
Aug 24, 7:34 PM CDT	Special Weather Statement	LBF	Holt	41 min
Aug 24, 7:38 PM CDT	Special Weather Statement	LBF	Blaine	52 min
Aug 24, 7:59 PM CDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Loup, Rock	46 min
Aug 24, 8:26 PM CDT	Areal Flood Advisory	LBF	Blaine, Brown, Holt, Loup, Rock	2 hr
Aug 24, 8:32 PM CDT	Special Weather Statement	LBF	Loup	43 min
Aug 24, 8:42 PM CDT	Special Weather Statement	LBF	Loup	48 min
Aug 24, 9:17 PM CDT	Special Weather Statement	LBF	Blaine, Loup	43 min
Aug 24, 9:54 PM CDT	Special Weather Statement	LBF	Blaine, Loup	51 min
Aug 24, 9:56 PM CDT	Areal Flood Advisory	LBF	Blaine, Loup	2 hr
Aug 24, 10:43 PM CDT	Special Weather Statement	LBF	Blaine, Loup	47 min
Aug 24, 11:34 PM CDT	Special Weather Statement	LBF	Loup	41 min
Aug 25, 12:00 AM CDT	Areal Flood Advisory	LBF	Blaine, Loup	3 hr
Aug 25, 5:38 PM CDT	Special Weather Statement	LBF	Cherry	52 min
Aug 25, 5:40 PM CDT	Special Weather Statement	LBF	Keya Paha	50 min
Aug 25, 6:22 PM CDT	Severe Thunderstorm Warning	LBF	Keya Paha	38 min
Aug 25, 6:30 PM CDT	Special Weather Statement	LBF	Keya Paha	15 min
Aug 25, 6:36 PM CDT	Special Weather Statement	LBF	Chase	39 min
Aug 25, 6:38 PM CDT	Severe Thunderstorm Warning	LBF	Keya Paha	22 min

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.