Alert archive / Nebraska / Special Weather Statements in 2017

Special Weather Statement, NWS Cheyenne, WY

May 14, 2017Dawes County, Nebraska

NWS Cheyenne, WY issued this special weather statement at May 14, 2017, 8:43 PM MDT for Dawes County, Nebraska. It was in force for 47 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: May 14, 2017, 8:43 PM MDT (02:43 UTC)
Expired: May 14, 2017, 9:30 PM MDT
In force: 47 min
Issued by: NWS Cheyenne, WY

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 182 km from the middle of the area, began a volume at 02:47 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

Rapid City, SD (KRAP), launched 00:00Z, 2.7 hours before the alert went out and 175 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: 2628 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at May 14, 5:22 PM MDT, 3 hours 21 minutes earlier.

Area forecast discussion, May 14, 5:22 PM MDT, 3 hours 21 minutes before

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Hazardous weather outlook, May 14, 2:18 PM MDT, 6 hours 25 minutes before

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In the hours before

Special weather statement, May 14, 7:28 PM MDT, 1 hour 15 minutes before

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Local storm report, May 14, 7:45 PM MDT, 58 minutes before

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Special weather statement, May 14, 8:06 PM MDT, 37 minutes before

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Local storm report, May 14, 8:14 PM MDT, 29 minutes before

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Special weather statement, May 14, 8:29 PM MDT, 14 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
829 PM MDT SUN MAY 14 2017

WYZ101-107-150315-
East Platte County WY-Converse County Lower Elevations WY-
829 PM MDT SUN MAY 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR EXTREME NORTHWESTERN PLATTE AND
SOUTHEAST CONVERSE COUNTIES UNTIL 915 PM MDT...

At 828 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles northwest of Glendo, or 13 miles southeast of Douglas, moving
northeast at 35 mph.

Dime size hail and very heavy rainfall will be possible with this
storm.

This storm will remain over mainly rural areas of northwestern Platte
and east central Converse Counties.

This includes Interstate 25 in Wyoming between mile markers 119 and
129.

LAT...LON 4251 10515 4258 10530 4292 10510 4284 10490
TIME...MOT...LOC 0228Z 213DEG 31KT 4261 10521

Emanuel

Special weather statement, May 14, 8:43 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
843 PM MDT SUN MAY 14 2017

NEZ002-095-150330-
Dawes NE-North Sioux NE-
843 PM MDT SUN MAY 14 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DAWES AND EAST
CENTRAL SIOUX COUNTIES UNTIL 930 PM MDT...

At 842 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles south of Fort Robinson Campground, or 34 miles southwest of
Chadron, moving east at 30 mph.

Dime size hail and very heavy rain will be possible with this storm.

This storm will remain over mainly rural areas of southwestern Dawes
and east central Sioux Counties.

LAT...LON 4249 10363 4261 10366 4270 10321 4249 10317
TIME...MOT...LOC 0242Z 262DEG 25KT 4255 10357

Emanuel

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 14, 6:01 PM MDT	Special Weather Statement	CYS	Platte	44 min
May 14, 6:33 PM MDT	Special Weather Statement	CYS	Niobrara	42 min
May 14, 6:51 PM MDT	Special Weather Statement	CYS	Goshen	39 min
May 14, 7:18 PM MDT	Special Weather Statement	CYS	Niobrara	42 min
May 14, 8:29 PM MDT	Special Weather Statement	CYS	Converse	46 min
May 14, 9:48 PM MDT	Special Weather Statement	CYS	Niobrara	27 min
May 15, 5:03 PM MDT	Special Weather Statement	CYS	Goshen	42 min
May 15, 5:18 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	42 min
May 14, 7:28 PM MDT	Special Weather Statement	CYS	Sioux	47 min
May 14, 8:06 PM MDT	Special Weather Statement	CYS	Sioux	39 min
May 14, 9:25 PM MDT	Special Weather Statement	CYS	Dawes	50 min
May 14, 11:23 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	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.