Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 260, NWS North Platte, NE

July 20, 2020Frontier County, Hayes County, Lincoln County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 20, 2020, 6:54 PM CDT for Frontier County, Hayes County, Lincoln County, Nebraska. It was in force for 51 min. 8 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: Jul 20, 2020, 6:54 PM CDT (23:54 UTC)
Expired: Jul 20, 2020, 7:45 PM CDT
In force: 51 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Tornado: Possible
Hail: 1.75 in
Wind: 70.0 mph

Counties Frontier County, NE, Hayes County, NE, Lincoln County, NE

The radar

The North Platte radar (KLNX), 139 km from the middle of the area, began a volume at 23:55 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
Jul 20, 7:04 PM CDT	TORNADO	3 W Dickens, NE	BRIEF TOUCHDOWN... QUICKLY WRAPPED IN RAIN. CORRECTED FOR LOCATION
Jul 20, 7:10 PM CDT	TSTM WND GST 60	Wallace, NE	WIND DRIVEN HAIL BROKE OUT NORTH FACING WINDOWS IN HOME.
Jul 20, 7:10 PM CDT	HAIL 2.75	Wallace, NE	ALL NORTH FACING WINDOWS IN HOME BROKEN OUT.
Jul 20, 7:26 PM CDT	TSTM WND DMG	2 E Wallace, NE	DELAYED REPORT. ONE MILE STRETCH OF POWER LINES DOWN AT HWY 23 AND 25 JUNCTION, THROWN HAY BALES, AND MANGLED TREES.
Jul 20, 7:26 PM CDT	TSTM WND GST 70	10 S Wallace, NE
Jul 20, 7:30 PM CDT	HAIL 1	8 Ssw Dickens, NE
Jul 20, 7:38 PM CDT	HAIL 2.75	5 S Wallace, NE
Jul 20, 7:45 PM CDT	HAIL 2.75	Wallace, NE	DELAYED REPORT. WIND DRIVEN BASEBALL SIZE HAIL, ESTIMATED 80 MPH.

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 7 storm reports to this severe thunderstorm warning; the first came 16 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
Jul 20, 4:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.9 hours before the alert went out and 59 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: 38 J/kg
Mixed-layer CIN: -415 J/kg
Mixed-layer LCL: 1496 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

441 
WUUS53 KLBF 202354
SVRLBF
NEC063-085-111-210045-
/O.NEW.KLBF.SV.W.0260.200720T2354Z-200721T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
654 PM CDT Mon Jul 20 2020

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northwestern Frontier County in southwestern Nebraska...
  Southwestern Lincoln County in southwestern Nebraska...
  Northern Hayes County in southwestern Nebraska...

* Until 745 PM CDT.

* At 654 PM CDT, a severe thunderstorm was located near Wallace, or
  23 miles north of Hayes Center, moving south 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...
  Wallace, Dickens, Marengo and Somerset. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4078 10125 4079 10124 4082 10125 4090 10125
      4098 10089 4065 10067 4054 10122
TIME...MOT...LOC 2354Z 337DEG 22KT 4084 10110 

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

Taylor

2 follow-up statements

993 
WWUS53 KLBF 210004
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
704 PM CDT Mon Jul 20 2020

NEC063-085-111-210045-
/O.CON.KLBF.SV.W.0260.000000T0000Z-200721T0045Z/
Frontier NE-Lincoln NE-Hayes NE-
704 PM CDT Mon Jul 20 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR NORTHWESTERN FRONTIER...SOUTHWESTERN LINCOLN AND NORTHERN HAYES
COUNTIES...

At 704 PM CDT, a severe thunderstorm was located near Dickens, or 20
miles north of Hayes Center, moving southeast at 20 mph.

This is a very dangerous storm.

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

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be severely injured. 
         Expect shattered windows, extensive damage to roofs, 
         siding, and vehicles.

Locations impacted include...
Wallace, Dickens, Marengo and Somerset. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4078 10125 4079 10124 4082 10125 4090 10125
      4098 10089 4065 10067 4054 10122
TIME...MOT...LOC 0004Z 336DEG 19KT 4080 10108 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...70MPH
 
$$

Taylor

017 
WWUS53 KLBF 210022
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
722 PM CDT Mon Jul 20 2020

NEC063-085-111-210045-
/O.CON.KLBF.SV.W.0260.000000T0000Z-200721T0045Z/
Frontier NE-Lincoln NE-Hayes NE-
722 PM CDT Mon Jul 20 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR NORTHWESTERN FRONTIER...SOUTHWESTERN LINCOLN AND NORTHERN HAYES
COUNTIES...

At 722 PM CDT, a severe thunderstorm was located 7 miles south of
Dickens, or 14 miles north of Hayes Center, moving southeast at 20
mph.

This is a very dangerous storm.

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

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be severely injured. 
         Expect shattered windows, extensive damage to roofs, 
         siding, and vehicles.

Locations impacted include...
Wallace, Dickens, Marengo and Somerset. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4078 10125 4079 10124 4082 10125 4090 10125
      4098 10089 4065 10067 4054 10122
TIME...MOT...LOC 0022Z 331DEG 19KT 4073 10102 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...70MPH
 
$$

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 Jul 20, 6:31 PM CDT, 23 minutes earlier.

Area forecast discussion, Jul 20, 6:31 PM CDT, 23 minutes before

Area Forecast Discussion
National Weather Service North Platte NE
631 PM CDT Mon Jul 20 2020

.SHORT TERM...(This evening through Tuesday night)
Issued at 340 PM CDT Mon Jul 20 2020

An upper trough in the northern stream will push a disturbance
through the area tonight. A weak cold front, and likely outflow
boundaries from thunderstorms will also move through. Scattered storms
in southern South Dakota will likely develop into organized
clusters of storms in north central Nebraska this evening and move
southeast. Deep layer shear is sufficient at 25 to 35KT with
instability near 3000 J/KG. The area is covered in a slight risk
for severe storms, with large hail and damaging winds possible.
Locally heavy rainfall also, with PWAT amounts near 1.5 inches.

Tuesday looks to be dry through much of the day in the wake of the
system tonight. Moisture will remain plentiful as PWATs still
1-1.5 inches. Slightly warmer in the mid 80s, with upper 80s far
southwest.

Thunderstorm chances increase again Tuesday night as the surface
front stalls in far northern Kansas. The best chances will be
north of this front across southwest and central Nebraska
overnight. A few strong storms possible along with locally heavy
rainfall.

.LONG TERM...(Wednesday through Monday)
Issued at 340 PM CDT Mon Jul 20 2020

For Wednesday and beyond, an upper ridge will build into the
region, and with that, hot temperatures into the mid 90s with
humid conditions Thursday through Sunday. Monsoonal moisture will
rotate across the region. Warmer temperatures aloft should
suppress thunderstorm development to some degree, with mainly
isolated late afternoon and evening thunderstorms possible.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 631 PM CDT Mon Jul 20 2020

The primary aviation weather concerns through Tuesday morning
include thunderstorms and low ceilings. Thunderstorm clusters will
continue to move through the Sandhills through 21/06z before
tapering to showers and exiting toward central Nebraska. Some
storms will be severe, capable of strong erratic winds and very
large hail. Expect brief significant visby drops. A stratus deck
will likely develop in the wake of the precipitation, mainly
across southwest and central Nebraska, resulting in MVFR cigs.

&&

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

SHORT TERM...Roberg
LONG TERM...Roberg
AVIATION...Snively

Hazardous weather outlook, Jul 20, 3:38 PM CDT, 3 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
338 PM CDT Mon Jul 20 2020

NEZ004>010-022>029-035>038-056>059-069>071-094-212045-
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-
338 PM CDT Mon Jul 20 2020 /238 PM MDT Mon Jul 20 2020/

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

.DAY ONE...TONIGHT.

Scattered thunderstorms expected tonight, some of which may be
severe. Storms will be triggered by a cold front moving through
the area from the north. The main hazards will be large hail,
damaging winds and heavy rainfall. Localized minor flooding is
possible.

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

Slight chances for thunderstorms Tuesday through Saturday due to a
series of disturbances impacting the region. There is a risk for
a few strong or severe thunderstorms Tuesday, mainly across
southwestern Nebraska. Later outlooks will evaluate the threat for
severe storms the remainder of the week.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to relay any severe weather reports to
the National Weather Service in North Platte.

&&

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

Meltzer/Taylor

In the hours before

Local storm report, Jul 20, 6:14 PM CDT, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
614 PM CDT MON JUL 20 2020

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

0611 PM     HAIL             PAXTON                  41.12N 101.36W
07/20/2020  M1.25 INCH       KEITH              NE   PUBLIC

            HALF DOLLAR SIZE HAIL

&&

RLAMB

Local storm report, Jul 20, 6:25 PM CDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
625 PM CDT MON JUL 20 2020

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

0615 PM     HAIL             13 SW SUTHERLAND        41.02N 101.30W
07/20/2020  E1.25 INCH       KEITH              NE   PUBLIC

            PEA TO MARBLE HAIL. SOME LARGER THAN A QUARTER

&&

RLAMB

Local storm report, Jul 20, 6:28 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
628 PM CDT MON JUL 20 2020

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

0610 PM     HAIL             3 NNE SENECA            42.09N 100.80W
07/20/2020  E1.75 INCH       THOMAS             NE   PUBLIC

&&

SMELTZER

Special weather statement, Jul 20, 6:35 PM CDT, 19 minutes before

Special Weather Statement
National Weather Service North Platte NE
535 PM MDT Mon Jul 20 2020

NEZ004-210015-
Sheridan NE-
535 PM MDT Mon Jul 20 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN SHERIDAN COUNTY UNTIL
615 PM MDT...

At 535 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Rushville, moving southeast at 25 mph.

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

Locations impacted include...
Gordon, Rushville, Clinton, Lone Butte, Mount Maria and Intersection
of Highway 27 and Mills Road.

This includes the following highways...
 Highway 20 between mile markers 89 and 109.
 Highway 250 between mile markers 46 and 48.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4280 10265 4298 10251 4284 10210 4256 10227
TIME...MOT...LOC 2335Z 296DEG 20KT 4284 10249

Snively

Local storm report, Jul 20, 6:38 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
638 PM CDT MON JUL 20 2020

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

0635 PM     HAIL             6 S SUTHERLAND          41.07N 101.13W
07/20/2020  E1.75 INCH       LINCOLN            NE   TRAINED SPOTTER

&&

CBROWN

Local storm report, Jul 20, 6:46 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
646 PM CDT MON JUL 20 2020

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

0635 PM     HAIL             9 SSE PAXTON            41.00N 101.28W
07/20/2020  E1.75 INCH       PERKINS            NE   PUBLIC

&&

SMELTZER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:23 PM CDT	Special Weather Statement	LBF	McPherson	52 min
Jul 19, 7:25 PM CDT	Special Weather Statement	LBF	Keith	50 min
Jul 19, 7:38 PM CDT	Severe Thunderstorm Warning	LBF	Hooker, Logan, McPherson, Thomas	52 min
Jul 19, 7:47 PM CDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	43 min
Jul 19, 7:53 PM CDT	Special Weather Statement	LBF	Garden	52 min
Jul 19, 8:14 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Garden, Keith	46 min
Jul 19, 8:18 PM CDT	Tornado Warning	LBF	McPherson	33 min
Jul 19, 8:19 PM CDT	Special Weather Statement	LBF	Keya Paha	41 min
Jul 19, 8:30 PM CDT	Severe Thunderstorm Warning	LBF	Chase	45 min
Jul 19, 8:34 PM CDT	Special Weather Statement	LBF	Garden	41 min
Jul 19, 8:35 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln, McPherson	40 min
Jul 19, 8:40 PM CDT	Areal Flood Advisory	LBF	Garden, Keith	3 hr
Jul 19, 9:00 PM CDT	Special Weather Statement	LBF	Boyd, Rock	45 min
Jul 19, 9:12 PM CDT	Special Weather Statement	LBF	Sheridan	33 min
Jul 19, 9:14 PM CDT	Special Weather Statement	LBF	Sheridan	31 min
Jul 19, 9:25 PM CDT	Special Weather Statement	LBF	Lincoln	35 min
Jul 19, 9:29 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	46 min
Jul 19, 9:44 PM CDT	Special Weather Statement	LBF	Sheridan	31 min
Jul 19, 10:28 PM CDT	Special Weather Statement	LBF	Sheridan	32 min
Jul 19, 10:46 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	44 min
Jul 19, 10:53 PM CDT	Special Weather Statement	LBF	Grant	52 min
Jul 19, 11:11 PM CDT	Special Weather Statement	LBF	Brown	49 min
Jul 19, 11:15 PM CDT	Special Weather Statement	LBF	Lincoln	30 min
Jul 19, 11:39 PM CDT	Special Weather Statement	LBF	Hooker	36 min
Jul 19, 11:49 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	41 min
Jul 20, 12:09 AM CDT	Severe Thunderstorm Warning	LBF	Hooker, Logan, McPherson, Thomas	51 min
Jul 20, 12:16 AM CDT	Special Weather Statement	LBF	Brown	29 min
Jul 20, 12:47 AM CDT	Special Weather Statement	LBF	Loup	43 min
Jul 20, 12:57 AM CDT	Special Weather Statement	LBF	Keya Paha	48 min
Jul 20, 1:33 AM CDT	Special Weather Statement	LBF	Garfield	42 min
Jul 20, 1:34 AM CDT	Special Weather Statement	LBF	Rock	41 min
Jul 20, 2:01 AM CDT	Special Weather Statement	LBF	Loup	44 min
Jul 20, 2:17 AM CDT	Special Weather Statement	LBF	Wheeler	28 min
Jul 20, 2:50 AM CDT	Areal Flood Advisory	LBF	Holt, Rock	3 hr
Jul 20, 2:47 PM CDT	Special Weather Statement	LBF	Keith	43 min
Jul 20, 3:46 PM CDT	Special Weather Statement	LBF	McPherson	29 min
Jul 20, 3:57 PM CDT	Special Weather Statement	LBF	McPherson	33 min
Jul 20, 3:59 PM CDT	Special Weather Statement	LBF	Arthur	31 min
Jul 20, 4:05 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Keith, Lincoln, McPherson	40 min
Jul 20, 4:12 PM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln	48 min
Jul 20, 4:17 PM CDT	Severe Thunderstorm Warning	LBF	Arthur	43 min
Jul 20, 4:29 PM CDT	Special Weather Statement	LBF	Hooker, McPherson	31 min
Jul 20, 4:49 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Keith, Lincoln, McPherson	41 min
Jul 20, 4:55 PM CDT	Severe Thunderstorm Warning	LBF	Hooker	50 min
Jul 20, 4:59 PM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln	46 min
Jul 20, 5:01 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Keith	44 min
Jul 20, 5:17 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Keith	28 min
Jul 20, 5:19 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	41 min
Jul 20, 5:45 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Garden, Keith, McPherson	45 min
Jul 20, 5:51 PM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln	39 min
Jul 20, 6:03 PM CDT	Areal Flood Advisory	LBF	Keith, Lincoln	3 hr
Jul 20, 6:04 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	25 min
Jul 20, 6:27 PM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln, Perkins	48 min
Jul 20, 6:32 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	43 min
Jul 20, 6:33 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	42 min
Jul 20, 6:35 PM CDT	Special Weather Statement	LBF	Sheridan	40 min
Jul 20, 6:55 PM CDT	Special Weather Statement	LBF	Grant	35 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2020 Every severe thunderstorm warning in 2020

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.