Alert archive / Nebraska / Special Weather Statements in 2017

Special Weather Statement, NWS North Platte, NE

September 16, 2017Boyd County, Nebraska

NWS North Platte, NE issued this special weather statement at Sep 16, 2017, 6:13 AM CDT for Boyd County, Nebraska. It was in force for 32 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: Sep 16, 2017, 6:13 AM CDT (11:13 UTC)
Expired: Sep 16, 2017, 6:45 AM CDT
In force: 32 min
Issued by: NWS North Platte, NE

County Boyd County, NE

The radar

The Sioux Falls radar (KFSD), 172 km from the middle of the area, began a volume at 11:14 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, 11.2 hours before the alert went out and 254 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: 136 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 2158 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 85 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 Sep 16, 3:51 AM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Sep 16, 3:51 AM CDT, 2 hours 22 minutes before

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Hazardous weather outlook, Sep 16, 5:03 AM CDT, 1 hour 10 minutes before

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In the hours before

Special weather statement, Sep 16, 1:53 AM CDT, 4 hours 20 minutes before

Special Weather Statement
National Weather Service North Platte NE
1253 AM MDT SAT SEP 16 2017

NEZ094-160745-
Western Cherry NE-
1253 AM MDT SAT SEP 16 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHERRY COUNTY UNTIL
145 AM MDT...

At 1252 AM MDT, Doppler radar was tracking a strong thunderstorm near
Medicine Lake, or 33 miles south of Martin, moving northeast at 40
mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Cody, Nenzel, Medicine Lake, Indian Hill, Cody Lake and Schoolhouse
Lake.

This includes Highway 20 between mile markers 150 and 169.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4282 10091 4258 10151 4274 10170 4300 10133
      4300 10115
TIME...MOT...LOC 0652Z 232DEG 33KT 4271 10151

Roberg

Special weather statement, Sep 16, 2:40 AM CDT, 3 hours 33 minutes before

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Special weather statement, Sep 16, 3:00 AM CDT, 3 hours 13 minutes before

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Special weather statement, Sep 16, 4:50 AM CDT, 1 hour 23 minutes before

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Special weather statement, Sep 16, 5:27 AM CDT, 46 minutes before

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Special weather statement, Sep 16, 6:13 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
Sep 16, 12:33 AM CDT	Special Weather Statement	LBF	Sheridan	42 min
Sep 16, 1:42 AM CDT	Special Weather Statement	LBF	Grant	48 min
Sep 16, 1:47 AM CDT	Severe Thunderstorm Warning	LBF	Garden	43 min
Sep 16, 1:50 AM CDT	Severe Thunderstorm Warning	LBF	Cherry	40 min
Sep 16, 1:53 AM CDT	Special Weather Statement	LBF	Cherry	52 min
Sep 16, 2:40 AM CDT	Special Weather Statement	LBF	Cherry	50 min
Sep 16, 3:00 AM CDT	Special Weather Statement	LBF	Arthur	45 min
Sep 16, 4:50 AM CDT	Special Weather Statement	LBF	Brown	40 min
Sep 16, 5:27 AM CDT	Special Weather Statement	LBF	Keya Paha, Rock	48 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.