Alert archive / Nebraska / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 52, NWS Cheyenne, WY

June 27, 20176 counties in Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 27, 2017, 7:29 PM MDT for 6 counties in Nebraska. It was in force for 61 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: Jun 27, 2017, 7:29 PM MDT (01:29 UTC)
Expired: Jun 27, 2017, 8:30 PM MDT
In force: 61 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 80.0 mph

Counties Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE

The radar

The Cheyenne radar (KCYS), 155 km from the middle of the area, began a volume at 01:30 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.5 hours before the alert went out and 194 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: 223 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 4187 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

010 
WUUS55 KCYS 280129
SVRCYS
NEC007-013-033-105-123-157-280230-
/O.NEW.KCYS.SV.W.0052.170628T0129Z-170628T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
729 PM MDT TUE JUN 27 2017

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Southeastern Box Butte County in the Panhandle of Nebraska...
  Southeastern Scotts Bluff County in the Panhandle of Nebraska...
  Cheyenne County in the Panhandle of Nebraska...
  Northeastern Kimball County in the Panhandle of Nebraska...
  Morrill County in the Panhandle of Nebraska...
  Eastern Banner County in the Panhandle of Nebraska...

* Until 830 PM MDT

* At 728 PM MDT, severe thunderstorms were located along a line
  extending from near Minatare to 11 miles north of Potter, moving
  east at 55 mph.

  These are very dangerous storms. 

  HAZARD...80 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. At 719 PM MDT, a 79 mph wind gust was 
           reported at the Scottsbluff Airport. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely. 

* Severe thunderstorms will be near, 
  The Intersection Of Highway 385 And L62 around 745 PM MDT. 
  Dalton and Angora around 750 PM MDT. 

Other locations impacted by these severe thunderstorms include
Broadwater.

This includes Interstate 80 in Nebraska between mile markers 33 and
51.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4116 10343 4177 10359 4168 10317 4200 10316
      4200 10268 4179 10268 4174 10265 4116 10261
TIME...MOT...LOC 0128Z 249DEG 49KT 4176 10347 4139 10334 

HAIL...1.00IN
WIND...80MPH
 
$$

Rubin

2 follow-up statements

673 
WWUS55 KCYS 280159
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
759 PM MDT TUE JUN 27 2017

NEC007-013-105-157-280209-
/O.CAN.KCYS.SV.W.0052.000000T0000Z-170628T0230Z/
Box Butte NE-Scotts Bluff NE-Kimball NE-Banner NE-
759 PM MDT TUE JUN 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR BOX BUTTE...SOUTHEASTERN
SCOTTS BLUFF...NORTHEASTERN KIMBALL AND EASTERN BANNER COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4116 10300 4166 10310 4200 10316 4200 10268
      4179 10268 4174 10265 4116 10261
TIME...MOT...LOC 0159Z 279DEG 36KT 4197 10314 4116 10290 

$$

NEC033-123-280230-
/O.CON.KCYS.SV.W.0052.000000T0000Z-170628T0230Z/
Cheyenne NE-Morrill NE-
759 PM MDT TUE JUN 27 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN CHEYENNE AND MORRILL COUNTIES...

At 759 PM MDT, severe thunderstorms were located along a line
extending from 7 miles north of Angora to near Colton, moving east at
40 mph.

HAZARD...70 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings. 

These severe thunderstorms will remain over mainly rural areas of 
northeastern Cheyenne and Morrill Counties, including the following 
locations: Broadwater.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4116 10300 4166 10310 4200 10316 4200 10268
      4179 10268 4174 10265 4116 10261
TIME...MOT...LOC 0159Z 279DEG 36KT 4197 10314 4116 10290 

HAIL...1.00IN
WIND...70MPH
 
$$

Rubin

186 
WWUS55 KCYS 280224
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
824 PM MDT TUE JUN 27 2017

NEC033-123-280234-
/O.EXP.KCYS.SV.W.0052.000000T0000Z-170628T0230Z/
Cheyenne NE-Morrill NE-
824 PM MDT TUE JUN 27 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHEYENNE AND
MORRILL COUNTIES WILL EXPIRE AT 830 PM MDT...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.

LAT...LON 4116 10300 4166 10310 4200 10316 4200 10268
      4179 10268 4174 10265 4116 10261
TIME...MOT...LOC 0224Z 249DEG 49KT 4208 10276 4127 10252 

$$

Rubin

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 27, 5:31 PM MDT, 1 hour 58 minutes earlier.

Area forecast discussion, Jun 27, 5:31 PM MDT, 1 hour 58 minutes before

Area Forecast Discussion
National Weather Service Cheyenne WY
531 PM MDT Tue Jun 27 2017

.SHORT TERM...(This evening through Thursday)
Issued at 412 PM MDT Tue Jun 27 2017

Vigorous shortwave moving into western Wyoming has sparked off
thunderstorms along what actually looks like a pre-frontal boundary
across southeast Wyoming, with these storms moving east across
the Panhandle. Another line of storms has developed along what is
more likely the front stretching from Niobrara County southwest
into Albany County. As expected, this activity has produced winds
of 45 to 55 mph within a deep and dry boundary layer. Can't rule
out a rogue gust to 60 mph too with shower/storm activity, but
predictability of stronger winds is tough in these combo dry
boundary layer/convection/synoptic situations. Across the
Panhandle and Niobrara County, SBCAPES have risen to 1000-2000
J/kg with the cap weakening. Ongoing storms here should clear to
the east in the next hour or two.

The Red Flag Warning will remain in effect through 7pm for FWZ
306 and 309. Conditions should improve through the night after
frontal passage and as the upper level shortwave shifts to the
east. Yet another wave will move overhead on Wednesday but
instability should be less overall with cooler temperatures and
drier conditions in place. Fire weather concerns should be less
than today, but may still be elevated especially in FWZ 309 due to
gusty westerly winds and dry humidities in the upper teens.
Afternoon and evening thunderstorms may yet again produce very
little rainfall. A stronger cold front dropping south Wednesday
evening and overnight period will bring much cooler temps to the
forecast area for Thursday. Another shortwave trough moving
overhead will bring chances for showers/storms in the afternoon.

.LONG TERM...(Thursday night through Monday)
Issued at 412 PM MDT Tue Jun 27 2017

Highs will be relatively cool on Friday behind the Thursday fropa.
Convective activity looks rather limited during the aftn with only
weak CAPE progged.  The GFS continues to show better llvl moisture
working into areas near the Colorado Border by Saturday, whereas the
Euro is drier.   Higher dewpoints/instability will likely move
northward into the western Panhandle by Sunday as a sfc trough
develops along the WY-NE border.  A shortwave will be moving
overhead on Sunday also, so with increased flow aloft and deep layer
shear, may see some potential for strong to severe storms east of
the sfc trough.  Warming will occur by Sunday, and especially as we
head toward the 4th of July, as the long range models intensify the
subtropical ridge to the southwest of the region.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 526 PM MDT Tue Jun 27 2017

Wyoming TAFS...VFR prevails, with isolated showers and
thunderstorms until 03Z. Wind gusts to 26 knots after 16Z
Wednesday.

Nebraska TAFS...VFR, with isolated showers and thunderstorms near
Chadron until 01Z.

&&

.FIRE WEATHER...
Issued at 412 PM MDT Tue Jun 27 2017

Red Flag Warning remains in effect through 7pm for FWZ 306 and
309. Fire Weather Conditions will improve some for Wednesday
although humidities look to drop into the upper teens with winds
gusting around 30 mph in the afternoon along and west of I-25.
Another round of afternoon showers and thunderstorms is expected
on Wednesday as well.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Red Flag Warning until 7 PM MDT this evening for WYZ306-309.

NE...None.
&&

SHORT TERM...RJM
LONG TERM...ZF
AVIATION...RUBIN
FIRE WEATHER...RJM

Hazardous weather outlook, Jun 27, 3:35 AM MDT, 15 hours 54 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
335 AM MDT Tue Jun 27 2017

WYZ101>119-280945-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
335 AM MDT Tue Jun 27 2017

This hazardous weather outlook is for portions of east central
Wyoming...south central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Widely scattered to scattered thunderstorms will develop this
afternoon with the greatest coverage over Converse and Niobrara
Counties. Gusty winds are possible with these storms but
widespread severe weather is not expected. Windy conditions will
also develop west of Interstate 25 this afternoon. Gusts of 40 to
50 mph are possible in these areas.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

The probability for widespread hazardous weather is low.

.Spotter information statement...

Spotter activation will not be needed.

NEZ002-003-019>021-054-055-095-096-280945-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-
335 AM MDT Tue Jun 27 2017

This hazardous weather outlook is for portions of western
Nebraska.

.DAY ONE...TODAY AND TONIGHT

Widely scattered to scattered showers and thunderstorms will
develop this afternoon. A few of these storms will be strong with
small hail and gusty winds but widespread severe weather is not
expected at this time.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

The probability for widespread hazardous weather is low.

.Spotter information statement...

Spotter activation will not be needed.

In the hours before

Local storm report, Jun 27, 6:38 PM MDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
638 PM MDT TUE JUN 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0625 PM     NON-TSTM WND GST 7 SSW MERIDEN REST AREA 41.44N 104.37W
06/27/2017  M67 MPH          LARAMIE            WY   DEPT OF HIGHWAYS

            WYDOT GUN BARREL.

&&

MJAMSKI

Local storm report, Jun 27, 6:39 PM MDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
639 PM MDT TUE JUN 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0637 PM     NON-TSTM WND GST ALBIN                   41.42N 104.10W
06/27/2017  M60 MPH          LARAMIE            WY   TRAINED SPOTTER

&&

MJAMSKI

Special weather statement, Jun 27, 6:39 PM MDT, 50 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
639 PM MDT Tue Jun 27 2017

NEZ020-054-280245-
Banner-Kimball-
Including the cities of Harrisburg and Kimball
639 PM MDT Tue Jun 27 2017

...Gusty northwest winds this evening...

An outflow boundary from showers will move quickly southeast at 60
mph across Banner and Kimball counties of Nebraska early this
evening.

As the outflow boundary passes you, expect northwest winds of 30
to 40 mph with gusts near 60 mph for about 30 minutes.

The boundary will pass Bushnell around 645 pm MDT...

Oliver Reservoir around 650 pm.
Kimball around 705 pm.

RUBIN

Local storm report, Jun 27, 6:48 PM MDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHEYENNE WY
648 PM MDT TUE JUN 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0250 PM     NON-TSTM WND GST DOUGLAS                 42.76N 105.39W
06/27/2017  E61.00 MPH       CONVERSE           WY   ASOS

            SUSTAINED WIND 45 MPH.

0455 PM     NON-TSTM WND GST 1 S ROCK RIVER          41.72N 105.97W
06/27/2017  M73.00 MPH       ALBANY             WY   MESONET

0515 PM     NON-TSTM WND GST LARAMIE                 41.31N 105.58W
06/27/2017  M90.00 MPH       ALBANY             WY   ASOS

            78-KNOT WIND GUST.

0515 PM     HAIL             LODGEPOLE               41.15N 102.64W
06/27/2017  M0.50 INCH       CHEYENNE           NE   PUBLIC

            HAIL DIME SIZE.

0526 PM     NON-TSTM WND GST 13 WNW LARAMIE          41.38N 105.81W
06/27/2017  M68.00 MPH       ALBANY             WY   DEPT OF HIGHWAYS

            WYDOT HERRICK LANE.

0532 PM     NON-TSTM WND GST 6 WNW BUFORD            41.14N 105.41W
06/27/2017  M65.00 MPH       ALBANY             WY   DEPT OF HIGHWAYS

            WYDOT VEDAUWOO.

0535 PM     NON-TSTM WND GST 9 W BUFORD              41.11N 105.47W
06/27/2017  M58.00 MPH       ALBANY             WY   DEPT OF HIGHWAYS

            WYDOT SUMMIT EAST.

0537 PM     NON-TSTM WND GST 1 ESE BUFORD            41.10N 105.28W
06/27/2017  M60.00 MPH       ALBANY             WY   DEPT OF HIGHWAYS

            WYDOT BUFORD EAST.

0537 PM     NON-TSTM WND GST 2 W BUFORD              41.11N 105.34W
06/27/2017  M76.00 MPH       ALBANY             WY   DEPT OF HIGHWAYS

            WYDOT LONE TREE.

0543 PM     NON-TSTM WND GST 7 NE BUFORD             41.18N 105.20W
06/27/2017  M58.00 MPH       LARAMIE            WY   DEPT OF HIGHWAYS

            WYDOT WILDCAT TRAIL.

0555 PM     NON-TSTM WND GST 16 E HORSE CREEK        41.41N 104.87W
06/27/2017  M68.00 MPH       LARAMIE            WY   DEPT OF HIGHWAYS

            WYDOT WHITAKER.

0555 PM     NON-TSTM WND GST 16 WSW CHEYENNE         41.06N 105.08W
06/27/2017  M61.00 MPH       LARAMIE            WY   DEPT OF HIGHWAYS

            WYDOT OTTO RD.

0600 PM     NON-TSTM WND GST 8 S CHUGWATER           41.64N 104.82W
06/27/2017  M58.00 MPH       LARAMIE            WY   DEPT OF HIGHWAYS

            WYDOT BEAR CREEK.

0600 PM     NON-TSTM WND GST 10 WSW CHEYENNE         41.09N 104.97W
06/27/2017  M58.00 MPH       LARAMIE            WY   DEPT OF HIGHWAYS

            I-80 MP 353.

0602 PM     NON-TSTM WND GST CHEYENNE                41.15N 104.79W
06/27/2017  M60.00 MPH       LARAMIE            WY   ASOS

            52-KT GUST.

0608 PM     NON-TSTM WND GST 1 WNW CHEYENNE          41.16N 104.82W
06/27/2017  M62.00 MPH       LARAMIE            WY   MESONET

0610 PM     NON-TSTM WND GST 9 S WHEATLAND           41.92N 104.96W
06/27/2017  M58.00 MPH       PLATTE             WY   DEPT OF HIGHWAYS

0616 PM     NON-TSTM WND GST 13 S GLENDO             42.32N 105.03W
06/27/2017  M60.00 MPH       PLATTE             WY   DEPT OF HIGHWAYS

            WYDOT COLEMAN.

0625 PM     NON-TSTM WND GST 7 SSW MERIDEN REST AREA 41.44N 104.37W
06/27/2017  M67.00 MPH       LARAMIE            WY   DEPT OF HIGHWAYS

            WYDOT GUN BARREL.

0637 PM     NON-TSTM WND GST ALBIN                   41.42N 104.10W
06/27/2017  M60.00 MPH       LARAMIE            WY   TRAINED SPOTTER

&&

MJAMSKI

Special weather statement, Jun 27, 7:08 PM MDT, 21 minutes before

Special Weather Statement
National Weather Service Cheyenne WY
708 PM MDT TUE JUN 27 2017

NEZ003-019-021-096-280200-
Scotts Bluff NE-Box Butte NE-Morrill NE-South Sioux NE-
708 PM MDT TUE JUN 27 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BOX BUTTE...SCOTTS
BLUFF...NORTHWESTERN MORRILL AND SOUTHEASTERN SIOUX COUNTIES UNTIL
800 PM MDT...

At 707 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Morrill to 8 miles south of Hubbard Hill.
Movement was east at 55 mph.

Dime size hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Strong thunderstorms will be near...
  Scottsbluff, Gering, Terrytown, Lake Alice and Scotts Bluff
  National Monument around 720 PM MDT.
  Scottsbluff Airport around 725 PM MDT.
  Minatare around 730 PM MDT.
  Bayard, Lake Minatare Campground and Lake Minatare around 735 PM
  MDT.
  Moomaws Corner and Kilpatrick Lake around 740 PM MDT.
  The Intersection Of Highway 385 And L62 around 745 PM MDT.
  Angora around 750 PM MDT.

Other locations impacted by these storms include McGrew and Melbeta.

LAT...LON 4223 10311 4172 10308 4170 10391 4199 10393
TIME...MOT...LOC 0107Z 247DEG 47KT 4199 10386 4171 10384

Rubin

Local storm report, Jun 27, 7:28 PM MDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
728 PM MDT TUE JUN 27 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0719 PM     TSTM WND GST     SCOTTSBLUFF             41.87N 103.66W
06/27/2017  M79 MPH          SCOTTS BLUFF       NE   ASOS

            68-KT GUST.

&&

MJAMSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 7:08 PM MDT	Special Weather Statement	CYS	Scotts Bluff	52 min
Jun 27, 7:19 PM MDT	Severe Thunderstorm Warning	CYS	Morrill, Scotts Bluff	41 min
Jun 28, 3:24 PM MDT	Special Weather Statement	CYS	Sioux	36 min
Jun 28, 3:58 PM MDT	Special Weather Statement	CYS	Cheyenne	47 min
Jun 28, 3:59 PM MDT	Special Weather Statement	CYS	Dawes	46 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2017 Every severe thunderstorm warning 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.