Alert archive / Nebraska / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 15, NWS North Platte, NE

April 30, 2018Custer County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Apr 30, 2018, 8:51 PM CDT for Custer County, Nebraska. It was in force for 39 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 30, 2018, 8:51 PM CDT (01:51 UTC)
Expired: Apr 30, 2018, 9:30 PM CDT
In force: 39 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

County Custer County, NE

The radar

The North Platte radar (KLNX), 125 km from the middle of the area, began a volume at 01:51 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.

What was reported inside it

Time	Report	Where	Remark
Apr 30, 8:53 PM CDT	HAIL 1	2 W Comstock, NE	COVERING THE GROUND.
Apr 30, 9:30 PM CDT	HAIL 1	Comstock, NE	REPORT VIA SOCIAL MEDIA OF QUARTER SIZE HAIL AT ESTIMATED TIME OF 930PM CDT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 2 storm reports to this severe thunderstorm warning; the first came 2 minutes after it went out.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 30, 5:40 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.9 hours before the alert went out and 113 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: 67 J/kg
Mixed-layer CIN: -221 J/kg
Mixed-layer LCL: 2671 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

245 
WUUS53 KLBF 010151
SVRLBF
NEC041-010230-
/O.NEW.KLBF.SV.W.0015.180501T0151Z-180501T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
851 PM CDT MON APR 30 2018

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  East central Custer County in central Nebraska...

* Until 930 PM CDT

* At 850 PM CDT, severe thunderstorms were located along a line
  extending from near Comstock to Ansley, moving east at 25 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings. 

* Locations impacted include...
  Ansley, Comstock, Westerville, Arcadia Diversion Dam State Wildlife
  Management Area and Wescott.

This includes the following highways...
 Highway 183 between mile markers 89 and 104.
 Highway 2 between mile markers 290 and 296, and near mile marker
304.
 Highway 92 between mile markers 300 and 308.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4131 9948 4158 9934 4159 9921 4140 9921
      4139 9920 4120 9920 4120 9921
TIME...MOT...LOC 0150Z 273DEG 21KT 4157 9932 4129 9941 

HAIL...1.75IN
WIND...70MPH
 
$$

Taylor

2 follow-up statements

287 
WWUS53 KLBF 010209
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
909 PM CDT MON APR 30 2018

NEC041-010230-
/O.CON.KLBF.SV.W.0015.000000T0000Z-180501T0230Z/
Custer NE-
909 PM CDT MON APR 30 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR EAST CENTRAL CUSTER COUNTY...

At 909 PM CDT, severe thunderstorms were located along a line
extending from Comstock to 8 miles west of Arcadia, moving northeast
at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

Locations impacted include...
Ansley, Comstock, Westerville, Arcadia Diversion Dam State Wildlife
Management Area and Wescott.

This includes the following highways...
 Highway 183 between mile markers 89 and 104.
 Highway 2 between mile markers 290 and 296, and near mile marker
304.
 Highway 92 between mile markers 300 and 308.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4131 9948 4158 9934 4159 9921 4140 9921
      4139 9920 4120 9920 4120 9921
TIME...MOT...LOC 0209Z 237DEG 20KT 4155 9924 4146 9928 

HAIL...1.00IN
WIND...60MPH
 
$$

Taylor

192 
WWUS53 KLBF 010227
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
927 PM CDT MON APR 30 2018

NEC041-010237-
/O.EXP.KLBF.SV.W.0015.000000T0000Z-180501T0230Z/
Custer NE-
927 PM CDT MON APR 30 2018

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CUSTER COUNTY
WILL EXPIRE AT 930 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However small hail,
gusty winds and heavy rain are still possible with these
thunderstorms.

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

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
North Platte.

LAT...LON 4131 9948 4158 9934 4159 9921 4140 9921
      4139 9920 4120 9920 4120 9921
TIME...MOT...LOC 0227Z 273DEG 21KT 4155 9924 4146 9928 

$$

Taylor

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 North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 30, 6:25 PM CDT, 2 hours 26 minutes earlier.

Area forecast discussion, Apr 30, 6:25 PM CDT, 2 hours 26 minutes before

Area Forecast Discussion...UPDATED
National Weather Service North Platte NE
625 PM CDT Mon Apr 30 2018

.SHORT TERM...(This evening through Tuesday)
Issued at 315 PM CDT Mon Apr 30 2018

Cold front is slowly sagging southeast across western NE this
afternoon. By early evening the front should extend from around
Bassett to Taylor to Hayes Center. Thunderstorms are expected to
develop early this evening near the front as a southerly LLJ
increases convergence along the boundary and continues to advect
higher Theta-E air northward into region. Shear profiles support
supercell structures and the potential for large hail, but appears
there will be quite a bit in the way of convection near the boundary
and that could lessen the severe potential some with many competing
updrafts. As the low level jet veers later this evening the
convergence will weaken and the storms should wane and shift east of
the area. Until this occurs there should be a two to three hour
period where storms could remain concentrated, with back building
potential. This seems most likely to occur across portions of Custer
county, north-northeastward across Loup, Garfield, Wheeler and into
portions of Holt county. Heavy rain could occur with the back
building, but at this time flooding rains are not expected.

The front sags south of the area Tuesday, with overcast conditions
expected as the low levels saturate leading to widespread stratus
clouds. Cannot rule out a few showers as well, but hard to pinpoint
exactly where. Models show some broad scale weak lift and mid level
moisture but nothing concentrated, so will include a slight to low
chance for showers for most areas to account for this. Much cooler
behind the front, with highs mostly in the 60s.

.LONG TERM...(Tuesday night through Monday)
Issued at 315 PM CDT Mon Apr 30 2018

The surface front will be driven south and east of the area
Tuesday night. Southwest flow aloft will remain across the area.
This will keep a 20 to 30 percent chance for post frontal showers
overnight. A few thunderstorms are also possible across the far
southern and eastern areas during the evening.

The large scale pattern remains active Wednesday into Thursday as
the longwave trough across the Great Basin moves east into the
Central Plains by Thursday. The surface environment will be
post frontal as the main frontal boundary remain south and east of
the forecast area. With southwest flow aloft, sufficient mid and
upper level moisture will be present for showers with occasional
embedded thunderstorms through Thursday. The models are in good
agreement with the synoptic scale pattern, but differ in timing
and location of any potential precip. POPs to increase to 30 to 40
percent by Wednesday afternoon, increasing to likely pops western
Sandhills Wednesday night into Thursday. The post frontal
conditions will keep temperatures slightly below normal, in the
upper 50s to low 60s. Considerable cloudiness the the periods.

The longwave trough will advance east of the area Thursday night,
followed by upper ridging Friday into Sunday. This will bring a
period of mainly dry conditions and highs returning to the mid 70s
for the weekend. As an upper trough drops south into the western
Conus Sunday night into Monday, the upper flow will become more
zonal. This will bring increased cloudiness and small shower
chance across the north and west. Highs by Monday still mild in
the upper 60s to lower 70s.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 625 PM CDT Mon Apr 30 2018

The thunderstorm activity underway will move east of north central
Nebraska 06z-09z tonight. Meanwhile, an area of MVFR/IFR cigs
should move southward into nwrn Neb and reside across all of wrn
and ncntl Neb Tuesday. Improvement to MVFR/VFR is expected 21z
Tuesday.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...
None.
&&

SHORT TERM...Taylor
LONG TERM...Roberg
AVIATION...CDC

Hazardous weather outlook, Apr 30, 4:56 PM CDT, 3 hours 55 minutes before

Hazardous Weather Outlook...CORRECTED
National Weather Service North Platte NE
456 PM CDT Mon Apr 30 2018

NEZ004>010-022>029-035>038-056>059-069>071-094-012115-
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-
456 PM CDT Mon Apr 30 2018 /356 PM MDT Mon Apr 30 2018/

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

.DAY ONE...TONIGHT.

A slow moving cold front will drift east across the area tonight.
Thunderstorms are expected to occur near the front. A few of the
storms could be severe with large hail, gusty winds, and heavy
downpours. The threat area is generally east of a line from
Ainsworth to North Platte to Hayes Center. Storms should decrease
and move east of the area after midnight.

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

A few thunderstorms are possible Wednesday night. At this time,
the threat for severe storms is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed late this afternoon into the
early evening hours, east of a line from Hayes Center to
Ainsworth.

&&

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

Taylor

In the hours before

Local storm report, Apr 30, 7:58 PM CDT, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
758 PM CDT MON APR 30 2018

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

0755 PM     HAIL             SE BROKEN BOW           41.41N 99.64W
04/30/2018  M1.25 INCH       CUSTER             NE   PUBLIC

&&

RKULIK

Local storm report, Apr 30, 8:12 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
812 PM CDT MON APR 30 2018

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

0740 PM     TSTM WND GST     10 W ONEILL             42.46N 98.84W
04/30/2018  E60 MPH          HOLT               NE   PUBLIC

&&

JGOMEZ

Local storm report, Apr 30, 8:28 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
828 PM CDT MON APR 30 2018

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

0819 PM     HAIL             1 E BROKEN BOW          41.41N 99.62W
04/30/2018  E1.25 INCH       CUSTER             NE   TRAINED SPOTTER

&&

JGOMEZ

Local storm report, Apr 30, 8:29 PM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
829 PM CDT MON APR 30 2018

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

0808 PM     HAIL             BROKEN BOW              41.41N 99.64W
04/30/2018  M1.00 INCH       CUSTER             NE   PUBLIC

&&

JGOMEZ

Local storm report, Apr 30, 8:43 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
843 PM CDT MON APR 30 2018

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

0815 PM     HAIL             5 SW SARGENT            41.59N 99.44W
04/30/2018  E1.00 INCH       CUSTER             NE   PUBLIC

&&

JGOMEZ

Local storm report, Apr 30, 8:49 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
849 PM CDT MON APR 30 2018

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

0849 PM     HAIL             5 S SARGENT             41.57N 99.37W
04/30/2018  E1.00 INCH       CUSTER             NE   PUBLIC

&&

JGOMEZ

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:04 PM CDT	Severe Thunderstorm Warning	LBF	Holt	41 min
Apr 30, 7:22 PM CDT	Severe Thunderstorm Warning	LBF	Holt	38 min
Apr 30, 7:24 PM CDT	Severe Thunderstorm Warning	LBF	Custer	51 min
Apr 30, 7:37 PM CDT	Special Weather Statement	LBF	Lincoln	38 min
Apr 30, 7:37 PM CDT	Severe Thunderstorm Warning	LBF	Holt	38 min
Apr 30, 7:41 PM CDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Loup, Rock	49 min
Apr 30, 7:47 PM CDT	Severe Thunderstorm Warning	LBF	Boyd, Holt	43 min
Apr 30, 8:14 PM CDT	Severe Thunderstorm Warning	LBF	Custer	46 min
Apr 30, 8:18 PM CDT	Severe Thunderstorm Warning	LBF	Custer	42 min
Apr 30, 9:11 PM CDT	Areal Flood Advisory	LBF	Custer	67 min
Apr 30, 9:40 PM CDT	Special Weather Statement	LBF	Garfield, Wheeler	65 min
Apr 30, 9:42 PM CDT	Special Weather Statement	LBF	Garfield, Wheeler	63 min
Apr 30, 9:43 PM CDT	Special Weather Statement	LBF	Garfield, Wheeler	62 min
Apr 30, 10:19 PM CDT	Flash Flood Warning	LBF	Custer	3 hr
Apr 30, 10:45 PM CDT	Special Weather Statement	LBF	Garfield, Wheeler	60 min
Apr 30, 10:49 PM CDT	Areal Flood Advisory	LBF	Garfield	116 min
Apr 30, 11:46 PM CDT	Special Weather Statement	LBF	Wheeler	59 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2018 Every severe thunderstorm warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.