Alert archive / Nebraska / Special Weather Statements in 2020

Special Weather Statement, NWS North Platte, NE

July 10, 20205 counties in Nebraska

NWS North Platte, NE issued this special weather statement at Jul 10, 2020, 10:21 PM CDT for 5 counties in Nebraska. It was in force for 54 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: Jul 10, 2020, 10:21 PM CDT (03:21 UTC)
Expired: Jul 10, 2020, 11:15 PM CDT
In force: 54 min
Issued by: NWS North Platte, NE

Counties Brown County, NE, Garfield County, NE, Holt County, NE, Rock County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 138 km from the middle of the area, began a volume at 03:25 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 3.4 hours before the alert went out and 186 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.

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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 North Platte, NE wrote its last area forecast discussion before this special weather statement went out at Jul 10, 7:09 PM CDT, 3 hours 12 minutes earlier.

Area forecast discussion, Jul 10, 7:09 PM CDT, 3 hours 12 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, 5 hours 59 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, 9:06 PM CDT, 1 hour 15 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, 1 hour 14 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

Special weather statement, Jul 10, 9:39 PM CDT, 42 minutes before

Special Weather Statement
National Weather Service North Platte NE
939 PM CDT Fri Jul 10 2020

NEZ007-010-110330-
Holt NE-Boyd NE-
939 PM CDT Fri Jul 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN HOLT AND BOYD COUNTIES
UNTIL 1030 PM CDT...

At 938 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Gross to 8 miles southwest of Naper.
Movement was south at 30 mph.

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

Locations impacted include...
Spencer, Atkinson, Stuart, Butte, Lynch, Naper, Gross, Bristow,
Dustin, Anoka, Monowi, Scottville, Opportunity, Spencer Dam, Midway,
Dorsey and Anncar.

This includes the following highways...
 Highway 20 between mile markers 275 and 288.
 Highway 281 between mile markers 192 and 223.
 Highway 12 between mile markers 87 and 144.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4296 9848 4293 9844 4293 9841 4288 9831
      4260 9831 4252 9924 4300 9925 4300 9850
TIME...MOT...LOC 0238Z 338DEG 27KT 4296 9851 4289 9922

CDC

Local storm report, Jul 10, 10:07 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1007 PM CDT FRI JUL 10 2020

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

0949 PM     TSTM WND GST     27 WSW VALENTINE        42.72N 101.04W
07/10/2020  M59 MPH          CHERRY             NE   OTHER FEDERAL

            WAKE WIND

&&

CCOLE

Local storm report, Jul 10, 10:12 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1012 PM CDT FRI JUL 10 2020

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

0950 PM     FLOOD            1 NNE VALENTINE         42.89N 100.54W
07/10/2020                   CHERRY             NE   COCORAHS

            0.82 INCHES OF RAIN IN 30 MINUTES PRODUCED MINOR FLOODING

&&

CCOLE

Special weather statement, Jul 10, 10:21 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service North Platte NE
1021 PM CDT Fri Jul 10 2020

NEZ007>010-027>029-110415-
Brown NE-Wheeler NE-Loup NE-Holt NE-Garfield NE-Rock NE-Boyd NE-
1021 PM CDT Fri Jul 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR ROCK...NORTHEASTERN LOUP...
SOUTHERN BROWN...GARFIELD...HOLT...SOUTHEASTERN BOYD AND NORTHERN
WHEELER COUNTIES UNTIL 1115 PM CDT...

At 1021 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 13 miles southeast of Lynch to 15 miles
northwest of Rose. Movement was southeast at 30 mph.

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

Locations impacted include...
O'neill, Ainsworth, Burwell, Bassett, O'Neill, Atkinson, Stuart,
Ewing, Long Pine, Chambers, Lynch, Page, Bartlett, Newport, Rose,
Amelia, Calamus Reservoir, Inman, Emmet and Monowi.

This includes the following highways...
 Highway 183 between mile markers 127 and 195.
 Highway 20 between mile markers 241 and 328.
 Highway 281 between mile markers 142 and 207.
 Highway 12 between mile markers 134 and 144.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
north central Nebraska.

LAT...LON 4175 9932 4250 10014 4287 9832 4277 9830
      4193 9830
TIME...MOT...LOC 0321Z 319DEG 27KT 4269 9830 4228 9980

CDC

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, 9:14 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha, Rock	61 min
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, 10:24 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

Special Weather Statements in Nebraska, 2020 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.