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Severe Thunderstorm Warning


Severe Weather Statement
National Weather Service Rapid City SD
921 PM MDT THU JUL 20 2017

WYC011-045-210345-
/O.CON.KUNR.SV.W.0105.000000T0000Z-170721T0345Z/
Weston WY-Crook WY-
921 PM MDT THU JUL 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM MDT
FOR CENTRAL WESTON AND SOUTHEASTERN CROOK COUNTIES...

At 921 PM MDT, severe thunderstorms were located along a line
extending from near Inyan Kara Mountain to near Osage to 8 miles
south of Clareton, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Upton, Osage, Clareton, Moskee and Inyan Kara Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4429 10411 4400 10418 4351 10450 4350 10487
      4424 10474
TIME...MOT...LOC 0321Z 267DEG 34KT 4421 10442 4393 10446 4357 10469

HAIL...<.75IN
WIND...60MPH

$$

JC


Severe Weather Statement


Severe Weather Statement
National Weather Service Rapid City SD
921 PM MDT THU JUL 20 2017

WYC011-045-210345-
/O.CON.KUNR.SV.W.0105.000000T0000Z-170721T0345Z/
Weston WY-Crook WY-
921 PM MDT THU JUL 20 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM MDT
FOR CENTRAL WESTON AND SOUTHEASTERN CROOK COUNTIES...

At 921 PM MDT, severe thunderstorms were located along a line
extending from near Inyan Kara Mountain to near Osage to 8 miles
south of Clareton, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Upton, Osage, Clareton, Moskee and Inyan Kara Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4429 10411 4400 10418 4351 10450 4350 10487
      4424 10474
TIME...MOT...LOC 0321Z 267DEG 34KT 4421 10442 4393 10446 4357 10469

HAIL...<.75IN
WIND...60MPH

$$

JC


Heat Advisory


URGENT - WEATHER MESSAGE...UPDATED
National Weather Service North Platte NE
816 PM CDT Thu Jul 20 2017

...Hot Weather Returns Friday...

.Hot and humid weather will return Friday with temperatures of
100 degrees or higher. Dewpoints in the 60s to lower 70s will
produce heat indices as high as 105.

NEZ005>010-022-024>029-035>038-056>059-069-210930-
/O.CON.KLBF.HT.Y.0005.170721T1700Z-170722T0100Z/
Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-Hooker-
Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-Logan-Custer-
Deuel-Keith-Perkins-Lincoln-Chase-
Including the cities of Valentine, Springview, Spencer, Butte,
Lynch, Ainsworth, Bassett, Rose, Oneill, Atkinson, Oshkosh,
Lewellen, Mullen, Thedford, Halsey, Dunning, Purdum, Brewster,
Taylor, Burwell, Bartlett, Ericson, Arthur, Tryon, Ringgold,
Stapleton, Broken Bow, Chappell, Big Springs, Ogallala, Paxton,
Grant, North Platte, Champion, Enders, Imperial, and Wauneta
816 PM CDT Thu Jul 20 2017 /716 PM MDT Thu Jul 20 2017/

...HEAT ADVISORY REMAINS IN EFFECT FROM NOON CDT /11 AM MDT/ TO
8 PM CDT /7 PM MDT/ FRIDAY...

* Temperatures will rise into the mid 90s to lower 100s with
  high humidity and heat indices of 100 to 105.

* Prolonged exposure to heat and humidity may lead to heat-
  related illness if precautions are not taken.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Heat Advisory means that a period of hot temperatures is
expected. The combination of hot temperatures and high humidity
will combine to create a situation in which heat illnesses are
possible. Drink plenty of fluids, stay in an air-conditioned
room, stay out of the sun, and check up on relatives and
neighbors.

  Take extra precautions, if you work or spend time outside.
When possible, reschedule strenuous activities to early morning
or evening. Know the signs and symptoms of heat exhaustion and
heat stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

  To reduce risk during outdoor work, the occupational safety
and health administration recommends scheduling frequent rest
breaks in shaded or air conditioned environments. Anyone overcome
by heat should be moved to a cool and shaded location.   Heat
stroke is an emergency, call 9 1 1.

&&

$$


Hazardous Weather Outlook


Hazardous Weather Outlook...UPDATED
National Weather Service North Platte NE
907 PM CDT Thu Jul 20 2017

NEZ004>010-022>029-035>038-056>059-069>071-094-220215-
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-
907 PM CDT Thu Jul 20 2017 /807 PM MDT Thu Jul 20 2017/

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

.DAY ONE...TONIGHT.

Thunderstorms are possible late tonight, mainly across northern
Nebraska. The risk of strong or severe thunderstorms is low.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

Heat index values are likely to reach between 100 to 110 degrees
Friday across much of western and north central Nebraska. A heat
advisory is in effect for Friday.

Isolated strong to briefly severe thunderstorms are possible
late Friday afternoon and evening. The area of concern is
generally south of a line from Ainsworth to Ogallala. Damaging
winds, large hail and locally heavy rainfall are the hazards.

Isolated strong thunderstorms will be possible along and south
of the Interstate 80 corridor Saturday afternoon and evening.
Strong wind gusts and small hail are possible.

The risk of strong to severe thunderstorms is low at this time
beyond Saturday night.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed through tonight.

&&

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

$$

Hazardous Weather Outlook
National Weather Service Rapid City SD
1059 AM MDT Thu Jul 20 2017

SDZ013-014-024>031-041-072>074-WYZ054>058-071-211300-
Northern Meade Co Plains-Ziebach-Northern Black Hills-
Northern Foot Hills-Rapid City-Southern Foot Hills-
Central Black Hills-Southern Black Hills-Custer Co Plains-
Pennington Co Plains-Fall River-Sturgis/Piedmont Foot Hills-
Southern Meade Co Plains-Hermosa Foot Hills-Northern Campbell-
Southern Campbell-Western Crook-Wyoming Black Hills-Weston-
Northeastern Crook-
1059 AM MDT Thu Jul 20 2017

This Hazardous weather outlook is for portions of the Black Hills
of South Dakota...western South Dakota...northeast Wyoming...and
the Black Hills of Wyoming.

.DAY ONE...Today and Tonight

Isolated to scattered showers and thunderstorms will develop late
this afternoon into this evening. Some of these storms will be
strong to severe with large hail and damaging winds possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

After a quiet weekend, an active weather pattern will return
early next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

$$

Hazardous Weather Outlook
National Weather Service Rapid City SD
1059 AM MDT Thu Jul 20 2017

SDZ032-042>044-046-047-049-211300-
Haakon-Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp-
1059 AM MDT Thu Jul 20 2017 /1159 AM CDT Thu Jul 20 2017/

This Hazardous weather outlook is for portions of south central
South Dakota...and western South Dakota.

.DAY ONE...Today and Tonight

Isolated to scattered showers and thunderstorms will move across
the South Dakota plains this evening and overnight. A few storms
will be strong to severe with large hail and damaging winds
possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

After a quiet weekend, an active weather pattern will return
early next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

$$

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1055 AM MDT Thu Jul 20 2017

COZ030>051-211700-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1055 AM MDT Thu Jul 20 2017

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Scattered thunderstorms will form over the higher terrain and spread
eastward across the Urban Corridor and eastern plains this afternoon
and evening. Most thunderstorms will produce heavy rain and gusty
outflow winds. A few storms could become severe with wind gusts to
60 mph and one inch diameter hail.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

The chance for showers and thunderstorms will remain elevated on
Friday and Saturday, with locally heavy rainfall possible Friday
afternoon through Saturday morning. Slower moving storms Friday
afternoon and evening will have the potential to produce a quick
inch of rain in a very short time, which could lead to localized
flooding. Storms will gradually diminish through the day
Saturday. Thunderstorm chances should drop off even further for
Sunday, Monday and Tuesday with high pressure building in from the
west. By Wednesday, thunderstorms return to the forecast with
temperatures increasing back into the 90s.


.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected to be needed today or tonight.

$$

Hazardous Weather Outlook
National Weather Service Cheyenne WY
502 AM MDT Thu Jul 20 2017

NEZ002-003-019>021-054-055-095-096-211115-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-
502 AM MDT Thu Jul 20 2017

This hazardous weather outlook is for portions of western
Nebraska.

.DAY ONE...TODAY AND TONIGHT

Scattered showers and thunderstorms will develop across the
western Nebraska Panhandle this afternoon lingering into the early
evening hours. A few storms north of a line from Harrisburg to
Alliance could become severe with hail to the size of quarters and
wind gusts to near 60 mph. Where stronger slow moving storms
persist, heavy rainfall could result in some flooding of small
creeks. The storms this afternoon will move from the southwest to
the northeast.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Showers and thunderstorms will be less numerous over the weekend,
with coverages of afternoon thunderstorms expected to increase
next week.

.Spotter information statement...
timely reports from storm spotters today regarding any observed
severe weather activity would be appreciated.

$$

Hazardous Weather Outlook
National Weather Service Cheyenne WY
502 AM MDT Thu Jul 20 2017

WYZ101>119-211115-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
502 AM MDT Thu Jul 20 2017

This hazardous weather outlook is for portions of east central
Wyoming...south central Wyoming and southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Scattered showers and thunderstorms will develop across the
southeastern Wyoming this afternoon lingering into the early
evening hours. A few storms along and east of Interstate 25 north
of Chugwater could become severe with hail to the size of
quarters and wind gusts to near 60 mph. Where slow moving storms
persist today, flooding of small creeks will be possible.  The
storms this afternoon will move from the southwest to the
northeast.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Showers and thunderstorms will be less numerous over the weekend,
with coverages of afternoon thunderstorms expected to increase
next week.

.Spotter information statement...
timely reports from storm spotters today regarding any observed
severe weather activity would be appreciated.



$$

Hazardous Weather Outlook
National Weather Service GRAND JUNCTION CO
416 AM MDT Thu Jul 20 2017

COZ001-002-004-005-010-012>014-018-019-023-UTZ023-024-211030-
Lower Yampa River Basin-Central Yampa River Basin-
Elkhead and Park Mountains-Upper Yampa River Basin-
Gore and Elk Mountains/Central Mountain Valleys-
West Elk and Sawatch Mountains-Flat Tops-
Upper Gunnison River Valley-Northwest San Juan Mountains-
Southwest San Juan Mountains-San Juan River Basin-
Eastern Uinta Mountains-Eastern Uinta Basin-
416 AM MDT Thu Jul 20 2017

This hazardous weather outlook is for portions of northwest
Colorado...southwest Colorado...west central Colorado and
northeast Utah.

.DAY ONE...Today and Tonight

Monsoonal moisture remains in place and will bring an increase in
thunderstorm coverage by the afternoon. Localized flooding due to
heavy rainfall rates will become more likely, especially over
areas that are already saturated from recent rainfall. Some
storms will also be capable of producing gusty outflow winds but
every storm will have the potential to create dangerous cloud to
ground lightning.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Moisture shifts eastward with potential for heavy rainfall
lasting through Friday. Some drier air works in from the
northwest on Saturday for a downturn in storm activity this
weekend into early next week. Another surge of moisture moves in
by the middle of next week, increasing the thunderstorm coverage.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

$$

Hazardous Weather Outlook
National Weather Service Riverton WY
221 AM MDT Thu Jul 20 2017

WYZ001>020-022>030-211100-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
221 AM MDT Thu Jul 20 2017

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Isolated to widely scattered afternoon and evening thunderstorms.
Heavy rain, hail and strong gusty wind are possible with any
storm. The best chance of strong storms will be in Natrona and
Johnson Counties.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Friday...Isolated thunderstorms across the south.

Monday through Wednesday...Isolated to scattered afternoon and
evening thunderstorms.

.SPOTTER INFORMATION STATEMENT...

Spotters are urged to report wind gusts over 45 mph, hail and any
flooding. Thank you.

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
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