Winter Storm Warning 6, NWS Denver/Boulder, CO

250 
WWUS45 KBOU 020349
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
949 PM MDT Tue May 1 2018

...HEAVY SNOW EXPECTED OVER PARTS OF THE NORTHERN COLORADO
MOUNTAINS WEDNESDAY NIGHT...

.A Spring storm system is expected to move over Colorado
Wednesday and Wednesday night, which will bring heavy snow to
the northern Colorado mountains. This storm is forming late in 
the season and will be moving out of the southwestern United 
States. Therefore, snow levels will start out quite high and then 
drop as the storm moves overhead. The storm will also contain high
amounts of moisture which will combine with mild temperatures to 
produce a heavy, wet snow with high water content. The storm 
system will move out of the state Thursday afternoon with mountain
snowfall decreasing through the day.

COZ033-021200-
/O.CON.KBOU.WS.W.0006.180502T1800Z-180503T1800Z/
Rocky Mountain National Park and the Medicine Bow Range-
Including the cities of Cameron Pass, 
Laramie and Medicine Bow Mountains, Rabbit Ears Range, 
Rocky Mountain National Park, and Willow Creek Pass
949 PM MDT Tue May 1 2018

...WINTER STORM WARNING REMAINS IN EFFECT FROM NOON WEDNESDAY TO
NOON MDT THURSDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 6 to 
  10 inches, with localized amounts up to 14 inches, are 
  expected.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range.

* WHEN...From noon Wednesday to noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. 
  Expect significant reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

904 
WWUS45 KBOU 021056
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
456 AM MDT Wed May 2 2018

...HEAVY SNOW EXPECTED OVER PARTS OF THE NORTHERN COLORADO
MOUNTAINS THIS AFTERNOON THROUGH THURSDAY MORNING...

.A Spring storm system is expected to move over Colorado
today and tonight, which will bring heavy snow to the northern 
Colorado mountains. This storm is forming late in the season and 
will be moving out of the southwestern United States. Therefore, 
snow levels will start out quite high and then drop as the storm 
moves overhead. The storm will also contain high amounts of 
moisture which will combine with mild temperatures to produce a 
heavy, wet snow with high water content. The storm system will 
move out of the state Thursday afternoon with mountain snowfall 
decreasing through the day.

COZ033-021900-
/O.CON.KBOU.WS.W.0006.180502T1800Z-180503T1800Z/
Rocky Mountain National Park and the Medicine Bow Range-
Including the cities of Cameron Pass, 
Laramie and Medicine Bow Mountains, Rabbit Ears Range, 
Rocky Mountain National Park, and Willow Creek Pass
456 AM MDT Wed May 2 2018

...WINTER STORM WARNING REMAINS IN EFFECT FROM NOON TODAY TO NOON
MDT THURSDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 8 to 12
  inches, with localized amounts up to 20 inches.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range.

* WHEN...From noon today to noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. 
  Expect significant reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

COZ031-021900-
/O.NEW.KBOU.WW.Y.0025.180502T1800Z-180503T1800Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
456 AM MDT Wed May 2 2018

...WINTER WEATHER ADVISORY IN EFFECT FROM NOON TODAY TO NOON MDT
THURSDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 inches,
  with localized amounts up to 15 inches, are expected.

* WHERE...Rabbit Ears Pass.

* WHEN...From noon today to noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions, 
  including during the evening commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

522 
WWUS45 KBOU 021715
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
1115 AM MDT Wed May 2 2018

...HEAVY SNOW EXPECTED OVER PARTS OF THE NORTHERN COLORADO
MOUNTAINS THIS AFTERNOON THROUGH THURSDAY MORNING...

.A Spring storm system is expected to move over Colorado today
into Thursday. This will bring moderate and heavy snow to the 
northern Colorado mountains. The snow levels will start out quite
high and then drop as the storm moves overhead. The storm will 
also contain high amounts of moisture which will combine with mild
temperatures to produce a heavy, wet snow with high water 
content. The storm system will move out of the state Thursday 
afternoon with mountain snowfall decreasing through the day.

COZ033-030115-
/O.CON.KBOU.WS.W.0006.180502T1800Z-180503T1800Z/
Rocky Mountain National Park and the Medicine Bow Range-
Including the cities of Cameron Pass, 
Laramie and Medicine Bow Mountains, Rabbit Ears Range, 
Rocky Mountain National Park, and Willow Creek Pass
1115 AM MDT Wed May 2 2018

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT
THURSDAY...

* WHAT...Heavy snow expected. Total snow accumulations of 8 to 
  12 inches, with localized amounts up to 20 inches.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range.

* WHEN...From noon today to noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. 
  Expect significant reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

COZ034-030115-
/O.EXA.KBOU.WW.Y.0025.180502T1800Z-180503T1800Z/
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of Berthoud Pass, Breckenridge, 
East Slopes Mosquito Range, East Slopes Southern Gore Range, 
Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, 
Williams Fork Mountains, and Winter Park
1115 AM MDT Wed May 2 2018

...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON MDT THURSDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 9 
  inches, with localized amounts up to 15 inches, are expected.

* WHERE...The Mountains of Summit County, the Mosquito Range, 
  and the Indian Peaks.

* WHEN...From noon today to noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions, 
  including during the evening commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

COZ031-030115-
/O.CON.KBOU.WW.Y.0025.180502T1800Z-180503T1800Z/
Rabbit Ears Pass-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, and Rabbit Ears Pass
1115 AM MDT Wed May 2 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
THURSDAY...

* WHAT...Snow expected. Total snow accumulations of 4 to 8 
  inches, with localized amounts up to 15 inches, are expected.

* WHERE...Rabbit Ears Pass.

* WHEN...From noon today to noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions, 
  including during the evening commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

396 
WWUS45 KBOU 030117
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
717 PM MDT Wed May 2 2018

...HEAVY SNOW EXPECTED OVER PARTS OF THE NORTHERN COLORADO
THROUGH THURSDAY MORNING...

.A Spring storm system will to move over Colorado tonight into 
Thursday. This will bring moderate and heavy snow to the northern 
Colorado mountains and higher foothills. The snow levels will 
start out quite high and then drop to around 7000 feet Thursday
morning as the storm moves overhead. The storm will also contain 
high amounts of moisture which will combine with mild temperatures
to produce a heavy, wet snow with high water content. The storm 
system will move out of the state Thursday afternoon with 
snowfall decreasing through the day.

COZ033-031200-
/O.CON.KBOU.WS.W.0006.000000T0000Z-180503T1800Z/
Rocky Mountain National Park and the Medicine Bow Range-
Including the cities of Cameron Pass, 
Laramie and Medicine Bow Mountains, Rabbit Ears Range, 
Rocky Mountain National Park, and Willow Creek Pass
717 PM MDT Wed May 2 2018

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT
THURSDAY...

* WHAT...Heavy snow. Additional snow accumulations of 8 to 12
  inches, with localized amounts up to 20 inches, are expected.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range.

* WHEN...Until noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. 
  Expect significant reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

COZ035-031200-
/O.EXA.KBOU.WW.Y.0025.000000T0000Z-180503T1800Z/
The Northern Front Range Foothills-
Including the cities of Estes Park, Glendevey, Nederland, 
and Red Feather Lakes
717 PM MDT Wed May 2 2018

...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON MDT THURSDAY...

* WHAT...Snow. Additional snow accumulations 4 to 8 inches, with
  localized amounts up to 10 inches, are expected above 8000 feet.
  Near the base of the foothills, about 6000 feet, rain will
  mainly fall. 

* WHERE...The Northern Front Range Foothills.

* WHEN...Until noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Expect 
  reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

COZ031-034-031200-
/O.CON.KBOU.WW.Y.0025.000000T0000Z-180503T1800Z/
Rabbit Ears Pass-
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, Rabbit Ears Pass, Berthoud Pass, Breckenridge,
East Slopes Mosquito Range, East Slopes Southern Gore Range, 
Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, 
Williams Fork Mountains, and Winter Park
717 PM MDT Wed May 2 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
THURSDAY...

* WHAT...Snow. Additional snow accumulations of 4 to 8 inches, 
  with localized amounts up to 12 inches, are expected.

* WHERE...Rabbit Ears Pass and The Mountains of Summit County, 
  the Mosquito Range, and the Indian Peaks.

* WHEN...Until noon MDT Thursday.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Expect 
  reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

142 
WWUS45 KBOU 030930
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
330 AM MDT Thu May 3 2018


COZ033-031730-
/O.CON.KBOU.WS.W.0006.000000T0000Z-180503T1800Z/
Rocky Mountain National Park and the Medicine Bow Range-
Including the cities of Cameron Pass, 
Laramie and Medicine Bow Mountains, Rabbit Ears Range, 
Rocky Mountain National Park, and Willow Creek Pass
330 AM MDT Thu May 3 2018

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches are expected.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on difficult travel conditions, 
  including during the morning commute. Expect significant 
  reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

COZ031-034-031730-
/O.CON.KBOU.WW.Y.0025.000000T0000Z-180503T1800Z/
Rabbit Ears Pass-
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, Rabbit Ears Pass, Berthoud Pass, Breckenridge,
East Slopes Mosquito Range, East Slopes Southern Gore Range, 
Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, 
Williams Fork Mountains, and Winter Park
330 AM MDT Thu May 3 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* WHAT...Snow. Additional snow accumulations of 3 to 5 inches, 
  with localized amounts up to 7 inches, are expected.

* WHERE...Rabbit Ears Pass and The Mountains of Summit County, 
  the Mosquito Range, and the Indian Peaks.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on slippery road conditions, 
  including during the morning commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

COZ035-031730-
/O.CON.KBOU.WW.Y.0025.000000T0000Z-180503T1800Z/
The Northern Front Range Foothills-
Including the cities of Estes Park, Glendevey, Nederland, 
and Red Feather Lakes
330 AM MDT Thu May 3 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches, 
  with localized amounts up to 6 inches, are expected.

* WHERE...The Northern Front Range Foothills.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on slippery road conditions, 
  including during the morning commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

856 
WWUS45 KBOU 031047
WSWBOU

URGENT - WINTER WEATHER MESSAGE
National Weather Service Denver CO
447 AM MDT Thu May 3 2018


COZ033-031800-
/O.CON.KBOU.WS.W.0006.000000T0000Z-180503T1800Z/
Rocky Mountain National Park and the Medicine Bow Range-
Including the cities of Cameron Pass, 
Laramie and Medicine Bow Mountains, Rabbit Ears Range, 
Rocky Mountain National Park, and Willow Creek Pass
447 AM MDT Thu May 3 2018

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches are expected.

* WHERE...Rocky Mountain National Park and the Medicine Bow 
  Range.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on difficult travel conditions, 
  including during the morning commute. Expect significant 
  reductions in visibility at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

COZ036-031800-
/O.EXB.KBOU.WW.Y.0025.180503T1100Z-180503T1800Z/
The Southern Front Range Foothills-
Including the cities of Bailey, Central City, Evergreen, 
Georgetown, Idaho Springs, and Westcreek
447 AM MDT Thu May 3 2018

...WINTER WEATHER ADVISORY IN EFFECT UNTIL NOON MDT TODAY...

* WHAT...Snow. Total snow accumulations of up to 5 to 10 inches 
  are expected.

* WHERE...The Southern Front Range Foothills.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on slippery road conditions, 
  including during the morning commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for wet snow means periods of wet snow
will cause primarily travel difficulties. Expect snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

COZ031-034-031800-
/O.CON.KBOU.WW.Y.0025.000000T0000Z-180503T1800Z/
Rabbit Ears Pass-
The Mountains of Summit County, the Mosquito Range, and the
Indian Peaks-
Including the cities of East Slopes Park and Northern Gore
Ranges, Gore Pass, Rabbit Ears Pass, Berthoud Pass, Breckenridge,
East Slopes Mosquito Range, East Slopes Southern Gore Range, 
Eisenhower Tunnel, Indian Peaks, Kenosha Mountains, Mount Evans, 
Williams Fork Mountains, and Winter Park
447 AM MDT Thu May 3 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* WHAT...Snow. Additional snow accumulations of 3 to 6 inches,
  with localized amounts up to 8 inches, are expected.

* WHERE...Rabbit Ears Pass and The Mountains of Summit County, 
  the Mosquito Range, and the Indian Peaks.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on slippery road conditions, 
  including during the morning commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

COZ035-031800-
/O.CON.KBOU.WW.Y.0025.000000T0000Z-180503T1800Z/
The Northern Front Range Foothills-
Including the cities of Estes Park, Glendevey, Nederland, 
and Red Feather Lakes
447 AM MDT Thu May 3 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT
TODAY...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches, 
  with localized amounts up to 6 inches, are expected.

* WHERE...The Northern Front Range Foothills.

* WHEN...Until noon MDT today.

* ADDITIONAL DETAILS...Plan on slippery road conditions, 
  including during the morning commute. Expect reduced 
  visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Expect snow covered roads
and limited visibilities, and use caution while driving. The
latest road conditions for the state you are calling from can be
obtained by calling 5 1 1.

&&

$$

Area Forecast Discussion
National Weather Service Denver/Boulder CO
326 PM MDT Tue May 1 2018

.SHORT TERM...(This evening through Wednesday)
Issued at 326 PM MDT Tue May 1 2018

Current radars show moderately strong thunderstorms moving
northeastward across western Adams, Boulder, Larimer and Weld
Counties. The hail reports for the storms were 1/4 up to 3/4s of
an inch in size. The wind gusts with the storms are gusting to
about 35 knots at best. Models keep strong southwesterly flow
aloft for Colorado overnight and Wednesday with a jet streak here
and there for the CWA. There is moderately strong upward vertical
velocity progged on the QG Omega fields tonight and Wednesday. For
the low level winds, there is a surge of northerly flow this
evening with models showing weaker north winds overnight. On
Wednesday, northeasterly winds are progged for the plains. The
moisture is progged for the CWA will be fairly decent tonight,
and there will be more on Wednesday. The best CAPE values are over
the central and southeastern CWA this evening. On Wednesday, the
highest CAPE is over the western and southern CWA. Dew point
values are in the 40S F for the plains on Wednesday. The QPF
fields have minor amounts of measurable precipitation for the
western and northern CWA overnight. Wednesday looks wetter in all
areas. For pops, will keep the highest numbers of the mountains
tonight, with minor to none for the plains. Wednesday looks wet.
Will go with "likely" pops for most areas. For temperatures,
Wednesday's highs will be 3-6 C cooler than today's highs.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 326 PM MDT Tue May 1 2018

An upper level low will continue to move northeastward Wednesday
night and Thursday and will move almost directly over the Denver
Metro. At the surface, a wave of low pressure will develop over
southeast Colorado and will allow for weak upslope flow over
northeast Colorado. In the upper levels, a jet streak will
traverse from central New Mexico through southeast Colorado
leaving northeast Colorado under a left exit region which will
maximize lift during the Wednesday night period. Model QPF fields
differ in location of the maximum precip with either the northern
mountains of Colorado or the Snowy Mountain range in Wyoming
seeing the highest totals. Despite relatively low snow ratios and
likely melting of some of the snow on roads due to the high sun
angle, the amount of snow warrants a Winter Storm Warning to be
issued for zone 33. Snow amounts of 8-16 inches are expected by
midday Thursday.

On Thursday, mid and upper level ridging will move over Colorado
as the trough departs to our east. This will allow for the
precipitation to end and for skies to begin clearing out. This
ridging will continue during the day on Friday as highs reach the
70s at lower elevations.

During the weekend, a large scale ridge will develop over the
western half of North America and will begin to block any major
systems coming off the Pacific through the middle of next week.
Despite no major systems coming into the west coast, small
disturbances will work their way through the southwest US underneath
the ridge. These disturbances, along with additional moisture and
upslope flow behind a cold front that moves through on Sunday,
will lead to chances for thunderstorms Sunday through Tuesday.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 326 PM MDT Tue May 1 2018

The winds at DIA are still being affected by thunderstorm
outflows. Models are still sticking with north to northeast winds
at the airport tonight and much of Wednesday. Cross sections of
moisture show that ceilings of BKN-OVC020 could get into DIA
around 08Z-09Z. Not much rain is expected all night, but Wednesday
looks pretty wet.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Winter Storm Warning from Wednesday afternoon through Thursday
morning for COZ033.

&&

SHORT TERM...RJK
LONG TERM....Dankers/Danielson
AVIATION.....RJK

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1055 AM MDT Tue May 1 2018

COZ030>051-021700-
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 Tue May 1 2018

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

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms will develop this afternoon
over the mountains and plains before diminishing later in the
evening. The best chance for storms will be along and north of a
line from Denver to Akron. The strongest storms may produce one
inch hail wind gusts to 60 mph. Further south over the Palmer
Divide, the airmass will be warmer and drier.

Over the high mountains above 10,500 feet snow showers may result
up to 4 inches of accumulation through tonight. Mountain valleys
will see a mix of rain and snow showers, but little if any
accumulation is expected.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

An upper level disturbance will move across the area Wednesday
into Thursday. This system will bring widespread precipitation
across north-central and northeast Colorado. Heavy, wet snow will
fall in the northern mountains Wednesday afternoon through
Thursday morning with several inches of accumulation possible. The
heaviest snow totals are expected to be across Larimer county and
Rocky Mountain National Park. Other mountain areas and higher
foothills will see lesser snow accumulations Wednesday night and
Thursday morning.

Drier and warmer weather will return on Friday and Saturday. On
Sunday and Monday, increased moisture with upslope flow will allow
for scattered thunderstorms to develop in the afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed after 1 pm over the northeast
plains.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
156 PM MDT TUE MAY 1 2018

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

0130 PM     HAIL             3 SW LONGMONT           40.14N 105.15W
05/01/2018  M0.88 INCH       BOULDER            CO   TRAINED SPOTTER

            HAIL 3/8 TO 1/2 INCH DIAMETER COVERED THE GROUND WITH A
            FEW STONES TO NICKEL SIZE

&&

JKALINA