Special Weather Statement, NWS North Platte, NE

Area Forecast Discussion...UPDATED
National Weather Service North Platte NE
630 PM CDT Tue Aug 15 2017

.UPDATE...
Issued at 505 PM CDT Tue Aug 15 2017

Updated forecast to reflect severe thunderstorm watch and added
heavy rain.

&&

.SHORT TERM...(This evening through Wednesday)
Issued at 305 PM CDT Tue Aug 15 2017

The HRRR, NAM and GFS continue bounce around the prospect of a heavy
rain center developing tonight somewhere between Valentine, Thedford
and Broken Bow. This not uncommon. We probably won't know where it
will develop until the thunderstorms begin coalesce this evening or
later.

It certainly appears conditions are favorable for storms capable of
heavy rainfall as storms began to develop late this morning. All
models indicate precipitable water increasing to 1.5 inches or
higher and remaining high overnight. A strong upper level trof
across UT/NV this afternoon will approach Nebraska overnight lowering
heights aloft, steepening lapse rates and forcing thunderstorm
development. The model consensus shows a sfc cold front drifting
southeast overnight with a large warm sector opening up across Ncntl
Neb.

The rain activity is expected to shift east Wednesday morning with
cooler temperatures and northwest winds.

Severe weather has developed and is expected to continue well into the
evening hours as a series of MCS's move through Swrn and Ncntl Neb.
Ping pong to golf ball size hail was reported beginning around 830 am.
The HRRR is the basis for this forecast. The amazing part of this is
bulk effective shear is less than 25kt, but lapse rates below 500
mb are steep.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 305 PM CDT Tue Aug 15 2017

The upper level trof across UT/NV this afternoon moves into the midwest
Thursday morning. This will set up northwest flow aloft which would
last until Saturday. 500mb winds aloft increase to around 30kt. Return
moisture develops Thursday suggesting a chance of thunderstorms late
Thursday/Thursday night. That rain chance shifts east Friday. More
return moisture develops Saturday through Monday with additional
rain chances mainly late in the day or in the evening. The potential
for strong or severe thunderstorms will remain under review at this
point. All rain chances are 40 percent or lower and generally isolated
in terms of coverage.

A gradual warming trend develops as h700 mb temperatures rise into the
lower teens by this weekend. This would support highs in the upper 80s
to around 90.

The sky forecast for 1 pm CDT Monday: the ECM and GFS would suggest the
potential for some high cloudiness associated with subtropical moisture
streaming across the Rockies.

The GFS indicates scattered midlevel cloudiness. Both the ECM and GFS
show morning stratus associated with a cold front drifting into Neb.
Presumably these clouds would burn off by noon.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 625 PM CDT Tue Aug 15 2017

Two areas of thunderstorms will continue this evening. Storms are
capable of heavy precipitation in both areas with near zero
visibility in the vicinity of thunderstorms. A nocturnal low level
jet will develop though the evening and intensify storms with
storms along and west of a KVTN to KLBF line capable of large hail
and strong damaging winds. Storms are expeceed to congeal after
midnight central and produce torrential rain through the early
morning hours.

&&

.HYDROLOGY...
Issued at 305 PM CDT Tue Aug 15 2017

WPC suggests the eastern portion of the forecast area could experience
some level of flooding over the next 24 hours. The Flash Flood Watch
has been expanded to include a good portion of Ncntl Neb and Swrn Neb.
The RFC 3-hour flash flood guidance shows 1.5 to 2 inches in many areas
and this was the basis for the flash flood watch covering much of the
forecast area.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...
Flash Flood Watch through Wednesday morning for NEZ006>010-022-
026>029-038-056>059-069>071.

&&

UPDATE...Power
SHORT TERM...CDC
LONG TERM...CDC
AVIATION...Power
HYDROLOGY...CDC

Hazardous Weather Outlook...UPDATED
National Weather Service North Platte NE
307 PM CDT Tue Aug 15 2017

NEZ004>010-022>029-035>038-056>059-069>071-094-162015-
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-
307 PM CDT Tue Aug 15 2017 /207 PM MDT Tue Aug 15 2017/

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

.DAY ONE...TONIGHT.

Severe storms are expected to continue this evening across a
large portion of western and north central Nebraska.

The area of concern is generally along and south of a line from
Alliance to Valentine to Spencer. The hazards are large hail and
damaging winds. An isolated tornado may form and this would be
most likely to occur east of highway 83.

The threat of flash flooding will accompany the severe weather.
Areas which received heavy rainfall over the past few days are at
greatest risk for flash flooding. See the Flash Flood Watch
product for details.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

Thunderstorms are possible Wednesday, and Thursday night, as well
as Sunday night across the outlook area. At this time, the threat
for severe storms is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and tonight.

&&

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

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Special Weather Statement
National Weather Service North Platte NE
1025 PM CDT TUE AUG 15 2017

NEZ057>059-069-070-160415-
Chase NE-Hayes NE-Perkins NE-Lincoln NE-Keith NE-
1025 PM CDT TUE AUG 15 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN PERKINS...EASTERN
KEITH...CHASE...WESTERN LINCOLN AND NORTHWESTERN HAYES COUNTIES UNTIL
1115 PM CDT/1015 PM MDT/...

At 1024 PM CDT/924 PM MDT/, Doppler radar was tracking strong
thunderstorms along a line extending from Champion to Paxton.
Movement was east at 25 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
North Platte, Imperial, Sutherland, Hershey, Wauneta, Paxton,
Wallace, Elsie, Dickens, Sarben, Enders, Sutherland Reservoir State
Recreation Area, Enders Reservoir State Recreation Area, Champion,
Crete, Grainton, Center Dam Campground, Coker, O'Fallons and Big Bald
Hill.

This includes the following highways...
 Highway 61 between mile markers 25 and 53.
 Highway 97 between mile markers 3 and 16.
 Interstate 80 in Nebraska between mile markers 143 and 174.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms. Do not
drive your vehicle through flooded roadways.

&&

A severe thunderstorm watch remains in effect until midnight CDT/1100
PM MDT/ for southwestern Nebraska.

LAT...LON 4089 10144 4139 10140 4139 10072 4089 10089
      4035 10142 4035 10197
TIME...MOT...LOC 0324Z 266DEG 22KT 4038 10187 4090 10135 4134 10122

Snively

Special Weather Statement
National Weather Service North Platte NE
1027 PM CDT TUE AUG 15 2017

NEZ024-025-036-037-160415-
Hooker NE-McPherson NE-Thomas NE-Logan NE-
1027 PM CDT TUE AUG 15 2017

...SIGNIFICANT WEATHER ADVISORY FOR HOOKER...WESTERN
LOGAN...MCPHERSON AND WESTERN THOMAS COUNTIES UNTIL 1115 PM CDT/1015
PM MDT/...

At 1026 PM CDT/926 PM MDT/, Doppler radar was tracking strong
thunderstorms along a line extending from near Mullen to Paxton.
Movement was northeast at 25 mph.

Wind gusts up to 50 mph will be possible with these storms.

Locations impacted include...
Mullen, Tryon, Seneca, Ringgold, Flatts, Big Lamunyon Flats, East
Cody Lake, Norway, Diamond Bar Lake, Schnick Lake, Hecla, Kelso and
Shimmons Lake.

This includes the following highways...
 Highway 2 between mile markers 172 and 206.
 Highway 92 between mile markers 183 and 218.
 Highway 97 between mile markers 17 and 70.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms. Do not
drive your vehicle through flooded roadways.

&&

A severe thunderstorm watch remains in effect until midnight CDT/1100
PM MDT/ for southwestern, north central and west central Nebraska.

LAT...LON 4209 10064 4139 10070 4140 10138 4209 10129
TIME...MOT...LOC 0326Z 247DEG 24KT 4208 10113 4139 10120

Snively