Alert archive / Nebraska / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 209, NWS North Platte, NE

July 10, 20204 counties in Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Jul 10, 2020, 9:14 PM CDT for 4 counties in Nebraska. It was in force for 61 min. 1 report 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 10, 2020, 9:14 PM CDT (02:14 UTC)
Expired: Jul 10, 2020, 10:15 PM CDT
In force: 61 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.25 in
Wind: 70.0 mph

Counties Brown County, NE, Cherry County, NE, Keya Paha County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 103 km from the middle of the area, began a volume at 02:15 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 10, 10:00 PM CDT	TSTM WND DMG	Ese Bassett, NE	4 INCH DIAMETER TREE LIMBS DOWNED

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 one storm report to this severe thunderstorm warning; the first came 46 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 10, 8:07 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.2 hours before the alert went out and 185 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: 2032 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

291 
WUUS53 KLBF 110214
SVRLBF
NEC017-031-103-149-110315-
/O.NEW.KLBF.SV.W.0209.200711T0214Z-200711T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service North Platte NE
914 PM CDT Fri Jul 10 2020

The National Weather Service in North Platte has issued a

* Severe Thunderstorm Warning for...
  Northeastern Cherry County in north central Nebraska...
  Northern Rock County in north central Nebraska...
  Northern Brown County in north central Nebraska...
  Keya Paha County in north central Nebraska...

* Until 1015 PM CDT.

* At 913 PM CDT, severe thunderstorms were located along a line
  extending from near Herrick to 8 miles northwest of Valentine,
  moving south at 25 mph.

  HAZARD...70 mph wind gusts and half dollar 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.

* Locations impacted include...
  Valentine, Ainsworth, Bassett, Springview, Long Pine, Newport,
  Johnstown, Norden, Wood Lake, Burton, Nets Peak, Bobcat State
  Wildlife Management Area, Meadville, North River Trail, Sparks,
  Keller Park State Recreation Area, Thomas Creek State Wildlife
  Management Area, Mariaville, Smith Falls State Park and Pine Glen
  State Wildlife Refuge.

This includes the following highways...
 Highway 183 between mile markers 176 and 225.
 Highway 20 between mile markers 192 and 273.
 Highway 97 between mile markers 137 and 141.
 Highway 83 between mile markers 195 and 222.
 Highway 12 between mile markers 1 and 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows!
 
&&

LAT...LON 4252 9927 4236 10042 4300 10070 4300 9927
TIME...MOT...LOC 0213Z 341DEG 22KT 4309 9929 4295 10067 

HAIL...1.25IN
WIND...70MPH
 
$$

CDC

2 follow-up statements

632 
WWUS53 KLBF 110234
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
934 PM CDT Fri Jul 10 2020

NEC017-031-103-149-110315-
/O.CON.KLBF.SV.W.0209.000000T0000Z-200711T0315Z/
Cherry NE-Rock NE-Brown NE-Keya Paha NE-
934 PM CDT Fri Jul 10 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHEASTERN CHERRY...NORTHERN ROCK...NORTHERN BROWN AND KEYA
PAHA COUNTIES...

At 933 PM CDT, severe thunderstorms were located along a line
extending from 10 miles west of Naper to Valentine, moving south at
25 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.

Locations impacted include...
Valentine, Ainsworth, Bassett, Springview, Long Pine, Newport, 
Johnstown, Norden, Wood Lake, Burton, Nets Peak, Meadville, North 
River Trail, Sparks, Keller Park, Thomas Creek, Mariaville and Smith 
Falls.

This includes the following highways...
 Highway 183 between mile markers 176 and 225.
 Highway 20 between mile markers 192 and 273.
 Highway 97 between mile markers 137 and 141.
 Highway 83 between mile markers 195 and 222.
 Highway 12 between mile markers 1 and 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows.
 
&&

LAT...LON 4252 9927 4236 10042 4300 10070 4300 9927
TIME...MOT...LOC 0233Z 341DEG 22KT 4294 9930 4287 10056 

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

CDC

510 
WWUS53 KLBF 110250
SVSLBF

Severe Weather Statement
National Weather Service North Platte NE
950 PM CDT Fri Jul 10 2020

NEC017-031-103-149-110315-
/O.CON.KLBF.SV.W.0209.000000T0000Z-200711T0315Z/
Cherry NE-Rock NE-Brown NE-Keya Paha NE-
950 PM CDT Fri Jul 10 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHEASTERN CHERRY...NORTHERN ROCK...NORTHERN BROWN AND KEYA
PAHA COUNTIES...

At 949 PM CDT, severe thunderstorms were located along a line
extending from 6 miles northeast of Newport to 7 miles northeast of
Valentine National Wildlife Refuge, moving south 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.

Locations impacted include...
Ainsworth, Bassett, Springview, Long Pine, Newport, Johnstown, 
Norden, Wood Lake, Burton, Meadville, North River Trail, Keller 
Park, Mariaville, Antelope Peak, Mills and Brocksburg.

This includes the following highways...
 Highway 183 between mile markers 176 and 222.
 Highway 20 between mile markers 198 and 273.
 Highway 97 between mile markers 137 and 140.
 Highway 83 between mile markers 195 and 207.
 Highway 12 between mile markers 24 and 85.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows.
 
&&

LAT...LON 4252 9927 4236 10042 4285 10063 4300 9927
TIME...MOT...LOC 0249Z 345DEG 35KT 4267 9923 4260 10049 

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

CDC

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 10, 7:09 PM CDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jul 10, 7:09 PM CDT, 2 hours 5 minutes before

Area Forecast Discussion
National Weather Service North Platte NE
709 PM CDT Fri Jul 10 2020

.SHORT TERM...(This evening through Saturday night)
Issued at 417 PM CDT Fri Jul 10 2020

The main forecast challenges over next few days include
thunderstorms (and severe potential) tonight and heat over the
weekend. A vigorous area of low pressure and associated fronts and
dryline, along with a mid-level shortwave, provide the focus for
convection through the night. As of 20z, several rounds of storms
traversed far northern Nebraska, resulting in wind damage and large
hail.

This evening and tonight... A rather complex scenario is unfolding
regarding thunderstorm potential. The lone supercell remaining (as
of 20z) is crossing from Blaine into Custer Counties. Visible
satellite indicates a cumulus field over much of southwest Neb, with
little change in height observed from the office. Cumulus does
appear to be growing more agitated along the dryline in the
panhandle, as well as stemming from the outflow boundary extending
west from the supercell. Short range guidance has been handling
today's event rather poorly with coverage and large discrepancies
still exist for possible initiation along the dryline. The 20z LBF
RAOB shows a midlevel capping inversion with MLCIN around -70 j/kg,
but MLCAPE around 2000 j/kg (and MUCAPE of 4000). Should convection
occur in the western Sandhills as suggested by some CAMS, the storms
should easily become severe per ample instability and more than
enough deep layer shear (50+ kts). Supercell will likely be the mode
of choice for any activity before sundown, with the most favorable
area from the panhandle into southwest Neb. The CAPE has a fat
profile, and telling from previous storms today, forming large hail
has not been an issue. These storms will also have a serious wind
threat, as shown by 1600+ DCAPE and a well mixed layer with 40+ kts
mid-level flow above that. However, further development is
conditional and confidence is somewhat low, depending on cap
strength. Best thinking is isolated storms at most that get carried
east rather quickly with steering current and then along the LLJ
nose if they still exist. More confidence exists with the second
wave of convection, or a potential MCS that rolls through north
central Nebraska after dark. The beginning of that setup is underway
north of the Black Hills, and most guidance suggests it crosses our
forecast area between 02-06z. At that time in north central Neb,
there should be enough instability to support continued severe
weather, although it's difficult to tell the effects from this
morning's activity. Dew points have held in the 60s up north with
the help of easterly surface flow. Shear definitely supports a QLCS
or some other organized form of convection with forecast values
pushing 60 kts. Also cannot rule out a tornado, either ahead of the
main line or with it. Low level shear is maximized in the far north,
but imagine LCL's lower through the evening and helicity to increase
near the cool front and ahead of the LLJ.

Saturday and Saturday night... Surface high pressure settles onto
the northern Plains while isentropic downglide and overall
subsidence resume over Nebraska. This sets up a blue sky day and a
light northerly breeze. Have tempered forecast highs a smidge,
mainly across the north. Very weak CAA is forecast at H85 with the
northerly flow, about 2 to 3C cooler than today. Forecast max temps
range from mid 80s north to lower 90s southwest. With light winds
and continued mostly clear skies, temps should fall to a seasonably
cool upper 50s at night.

.LONG TERM...(Sunday through Friday)
Issued at 417 PM CDT Fri Jul 10 2020

Sunday and beyond... The upper ridge stays parked over the southern
Plains while a low wiggles through the Prairie Provinces, placing
Nebraska in quasi-zonal flow. Temperatures over the next week will
be similar to last week with a couple days of hot weather (highs 90s
Sun, Mon, Thu) and some more moderate with highs in the 80s. After a
primarily dry weekend, precip chances reappear Monday as the next
surface low and associated fronts line up the High Plains. Scattered
storm chances exist nearly every day, but perhaps the best chance of
widespread activity (and possibly severe) comes Tuesday with the
cool front passage.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 708 PM CDT Fri Jul 10 2020

Isolated thunderstorms will continue to impact portions of north
central Nebraska through the evening and overnight hours. Limited
impacts to aviation conditions are expected, however, any
thunderstorm can create erratic and gusty winds as well as
reductions in visibility. Quieter weather returns for Saturday
morning as high pressure begins to build into the region.

&&

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

SHORT TERM...Snively
LONG TERM...Snively
AVIATION...Kulik

Hazardous weather outlook, Jul 10, 4:22 PM CDT, 4 hours 52 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
422 PM CDT Fri Jul 10 2020

NEZ004>010-022>029-035>038-056>059-069>071-094-112130-
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-
422 PM CDT Fri Jul 10 2020 /322 PM MDT Fri Jul 10 2020/

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

.DAY ONE...TONIGHT.

Isolated thunderstorms will continue to affect parts of southwest
and central Nebraska through the evening. Any storm will be
capable of producing large hail, damaging winds, and torrential
rainfall.

Additional storms are expected after sunset, primarily across
north central Nebraska. Damaging winds and very heavy rain are the
primary threats.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

Near daily thunderstorm chances exist Monday through Thursday,
with the best chance of widespread precipitation coming late
Tuesday. Stay tuned to later forecasts regarding severe potential.

.SPOTTER INFORMATION STATEMENT...

Please relay any information about observed severe weather and
rainfall reports to the NWS.

&&

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

In the hours before

Local storm report, Jul 10, 8:35 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
835 PM CDT FRI JUL 10 2020

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

0815 PM     HAIL             5 NNW MERRIMAN          42.99N 101.73W
07/10/2020  E1.75 INCH       CHERRY             NE   TRAINED SPOTTER

&&

CBROWN

Local storm report, Jul 10, 8:39 PM CDT, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
839 PM CDT FRI JUL 10 2020

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

0815 PM     HAIL             5 NNW MERRIMAN          42.99N 101.74W
07/10/2020  E2.00 INCH       CHERRY             NE   TRAINED SPOTTER

&&

CBROWN

Local storm report, Jul 10, 8:43 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
843 PM CDT FRI JUL 10 2020

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

0839 PM     HAIL             3 WSW ELI               42.92N 101.50W
07/10/2020  E2.50 INCH       CHERRY             NE   TRAINED SPOTTER

&&

CBROWN

Local storm report, Jul 10, 8:46 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
846 PM CDT FRI JUL 10 2020

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

0823 PM     HAIL             NE MERRIMAN             42.92N 101.70W
07/10/2020  M2.00 INCH       CHERRY             NE   PUBLIC

            REPORTED VIA TWITTER

&&

RKULIK

Local storm report, Jul 10, 9:06 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
906 PM CDT FRI JUL 10 2020

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

0900 PM     FLASH FLOOD      CODY                    42.94N 101.25W
07/10/2020                   CHERRY             NE   TRAINED SPOTTER

            SPOTTER REPORTS BASEMENT IS FILLING WITH WATER

&&

CCOLE

Local storm report, Jul 10, 9:07 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
907 PM CDT FRI JUL 10 2020

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

0855 PM     HAIL             3 SSW CODY              42.90N 101.26W
07/10/2020  E1.00 INCH       CHERRY             NE   TRAINED SPOTTER

&&

CBROWN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 7:53 PM CDT	Tornado Warning Tornado observed	LBF	Cherry	52 min
Jul 10, 7:56 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	49 min
Jul 10, 8:01 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	27 min
Jul 10, 8:46 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	59 min
Jul 10, 9:10 PM CDT	Flash Flood Warning	LBF	Cherry	3 hr
Jul 10, 9:39 PM CDT	Special Weather Statement	LBF	Boyd	51 min
Jul 10, 9:46 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Grant, Hooker, Thomas	59 min
Jul 10, 10:09 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Thomas	51 min
Jul 10, 10:13 PM CDT	Areal Flood Advisory	LBF	Boyd, Brown, Holt, Keya Paha, Rock	3 hr
Jul 10, 10:21 PM CDT	Special Weather Statement	LBF	Brown, Garfield, Holt, Rock, Wheeler	54 min
Jul 10, 10:24 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	51 min
Jul 10, 10:54 PM CDT	Special Weather Statement	LBF	Cherry	51 min
Jul 10, 11:10 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	65 min
Jul 10, 11:15 PM CDT	Special Weather Statement	LBF	Garfield, Loup, Wheeler	45 min
Jul 10, 11:18 PM CDT	Special Weather Statement	LBF	Logan, Thomas	57 min
Jul 10, 11:44 PM CDT	Special Weather Statement	LBF	Lincoln	46 min
Jul 11, 12:02 AM CDT	Severe Thunderstorm Warning	LBF	Cherry	43 min
Jul 11, 12:19 AM CDT	Areal Flood Advisory	LBF	Brown, Cherry	3 hr
Jul 11, 12:39 AM CDT	Severe Thunderstorm Warning	LBF	Blaine, Brown, Cherry, Thomas	51 min
Jul 11, 1:02 AM CDT	Severe Thunderstorm Warning	LBF	Blaine, Thomas	43 min
Jul 11, 1:30 AM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	45 min
Jul 11, 2:03 AM CDT	Severe Thunderstorm Warning	LBF	Custer	42 min
Jul 11, 2:22 AM CDT	Special Weather Statement	LBF	Custer	38 min
Jul 11, 2:32 AM CDT	Severe Thunderstorm Warning	LBF	Custer	43 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.