Heat Advisory
URGENT - WEATHER MESSAGE
National Weather Service North Platte NE
1236 PM CDT Sat Jul 18 2026
NEZ022>024-035-056-190900-
/O.CON.KLBF.HT.Y.0001.260720T1600Z-260721T0200Z/
Garden-Grant-Hooker-Arthur-Deuel-
Including the cities of Chappell, Hyannis, Arthur, Big Springs,
Oshkosh, Lewellen, and Mullen
1136 AM MDT Sat Jul 18 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM TO 8 PM MDT MONDAY...
* WHAT...Heat index values up to 101 expected.
* WHERE...Portions of panhandle and west central Nebraska.
* WHEN...From 10 AM to 8 PM MDT Monday.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service North Platte NE
1236 PM CDT Sat Jul 18 2026
NEZ025-036>038-057>059-069>071-190900-
/O.CON.KLBF.HT.Y.0001.260720T1600Z-260721T0200Z/
Thomas-McPherson-Logan-Custer-Keith-Perkins-Lincoln-Chase-Hayes-
Frontier-
Including the cities of Ogallala, Champion, Stapleton, Broken
Bow, Maywood, Enders, Hayes Center, Halsey, Thedford, Imperial,
Curtis, Wauneta, Ringgold, Grant, Tryon, North Platte, Paxton,
and Eustis
1236 PM CDT Sat Jul 18 2026 /1136 AM MDT Sat Jul 18 2026/
...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM CDT /10 AM MDT/ TO 9
PM CDT /8 PM MDT/ MONDAY...
* WHAT...Heat index values up to 104 expected.
* WHERE...Portions of central, north central, southwest, and west
central Nebraska.
* WHEN...From 11 AM CDT /10 AM MDT/ to 9 PM CDT /8 PM MDT/ Monday.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
&&
$$
For more information from the National Weather Service, visit
www.weather.gov/lbf.
Kulik
URGENT - WEATHER MESSAGE
National Weather Service Denver CO
446 AM MDT Sat Jul 18 2026
COZ038>040-043-182100-
/O.CON.KBOU.HT.Y.0002.260719T1600Z-260721T0300Z/
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-Central and South Weld County-
Including the cities of Parker, Longmont, Nunn, Littleton, Highlands
Ranch, Lakewood, Loveland, Brighton, Boulder, Golden, Eaton, Fort
Collins, Fort Lupton, Arvada, Greeley, Roggen, City of Denver, Denver
International Airport, Aurora, and Hereford
446 AM MDT Sat Jul 18 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM SUNDAY TO 9 PM MDT
MONDAY...
* WHAT...High temperatures between 98-102 expected on Sunday and
Monday. Low temperatures Sunday night will be between 68-71 in the
Denver metro.
* WHERE...Fort Collins, Boulder, the Denver metro, and Greeley.
* WHEN...From 10 AM Sunday to 9 PM MDT Monday.
* IMPACTS...Hot temperatures may cause heat illnesses.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
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.
&&
$$
For more information from the National Weather Service, visit
https://weather.gov/bou
Hiris
Air Quality Alert
COC005-059-013-031-123-035-014-069-001-192200-
Arapahoe-Jefferson-Boulder-Denver-Weld-Douglas-Broomfield-
Larimer-Adams-
410 PM MDT Sat Jul 18 2026
...OZONE ACTION DAY ALERT FROM 400 PM SATURDAY UNTIL 400 PM
SUNDAY...
The Colorado Department of Public Health and Environment has
issued the following...
WHAT...Ozone Action Day Alert.
WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties
WHEN...400 PM Saturday July 18 to 400 PM Sunday July 19
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Hot and sunny weather will allow ozone to
reach levels that are Unhealthy for Sensitive Groups on Saturday
and Sunday. The highest concentrations are most likely in western
portions of the northern Colorado Front Range region. For
Colorado air quality conditions, forecasts, and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx If
possible, please help us reduce ozone pollution by limiting
driving gas and diesel-powered vehicles until at least 4 p.m.
Sunday, July 19, 2026. Colorado is also addressing ozone pollution
through state policies. For more information about health impacts
and how ozone pollution forms in Colorado, visit:
https://cdphe.colorado.gov/ozone- pollution-and-your-health
HEALTH INFORMATION...Increasing likelihood of respiratory symptoms
in sensitive individuals, aggravation of heart or lung disease and
premature mortality in people with cardiopulmonary disease and
older adults. People with heart or lung disease, older adults, and
children should reduce prolonged or heavy exertion.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service North Platte NE
231 PM CDT Sat Jul 18 2026
NEZ004>010-022>029-035>038-056>059-069>071-094-191945-
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-
231 PM CDT Sat Jul 18 2026 /131 PM MDT Sat Jul 18 2026/
This Hazardous Weather Outlook is for portions of western and north
central Nebraska.
.DAY ONE...Tonight.
Isolated thunderstorms are possible through early evening across the
Sandhills east of US-83. The risk for severe thunderstorms is low
with the main threats being some small hail or stronger winds.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
High temperatures will climb into the upper 90s to low 100s with heat
indices rising into the low 100s across much of western and north
central Nebraska on Sunday and Monday. A heat advisory remains in
effect for portions of north central Nebraska on Sunday and much of
western and north central Nebraska on Monday. Those sensitive to
excessive heat should continue to monitor the forecast for additional
details. Cooler temperatures in the low to mid 90s return on Tuesday.
Thunderstorm chances are expected as early as Monday afternoon, with
a better potential Tuesday night through the end of the week. At
this time, the threat for severe weather is low.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service Goodland KS
1135 AM MDT Sat Jul 18 2026
COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-191745-
Yuma-Kit Carson-Cheyenne CO-Cheyenne KS-Rawlins-Decatur-Norton-
Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-
Dundy-Hitchcock-Red Willow-
1135 AM MDT Sat Jul 18 2026 /1235 PM CDT Sat Jul 18 2026/
This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.
.DAY ONE...TODAY AND TONIGHT...
Hazardous weather is not expected at this time.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...
Air temperatures and heat indices are forecast to reach the lower
100`s over much of the area on Monday, hottest along and east of
Highway 83. Heat related illnesses are possible if extra caution is
not taken. If you must be outdoors, drink plenty of water and take
frequent breaks in the shade or an air conditioned building.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected today or tonight.
$$
Vincent
Hydrologic Outlook
Hydrologic Outlook
COC007-029-033-045-051-053-067-077-081-083-085-091-103-107-111-113-
UTC019-037-200300-
Hydrologic Outlook
National Weather Service Grand Junction CO
1129 AM MDT Sat Jul 18 2026
...RISK OF FLASH FLOODING AND DEBRIS FLOWS INCLUDING RECENT BURN
SCARS...
Anomalous moisture has become established across portions of
eastern Utah and western Colorado. Rainfall rates of 1-2 inches
per hour will be possible with the stronger storms. These rates
could lead to flash flooding and debris flows especially over
recent burn scars.
Storms over the last few days have helped prime lower levels of
the atmosphere and saturate the ground where rain was observed.
Several locations across southwest Colorado have reported 0.5
to 1.0 inches of rain within 30 minutes; which is more than
sufficient to create issues in our steep, rocky terrain that is
already susceptible to flash flooding. This environment also
triggers heightened awareness over recent (or actively burning)
fires, due to the burnt ground`s inability of absorbing moisture
under heavy rainfall. As such, we continue to emphasize the
potential for flash flooding and debris flows in this regime.
As a reminder: Keep an eye on our forecasts through the end of
the week and stay tuned for updated hydrology alerts if
visiting or if you reside below vulnerable terrain to flash
flooding and/or debris flows. Storms across the west develop
quickly, leaving little room for lead time in flashy terrain.
$$
KJS
