Hazardous Weather Outlook
Issued by NWS Denver/Boulder, CO

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FLUS45 KBOU 181029

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
429 AM MDT Fri May 18 2018

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
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
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
429 AM MDT Fri May 18 2018

...Heavy snow possible in the mountains of western Larimer and
western Boulder counties tonight and Saturday...
...Heavy rain and potential flooding late tonight through

This hazardous weather outlook is for northeast and north central

.DAY ONE...Today and Tonight

Scattered to numerous thunderstorms are expected to form in and
near the foothills early to mid afternoon. These storms will
progress eastward across northeast Colorado through the late
afternoon and evening. Some of the storms are expected to become
severe with golf ball size hail and damaging winds. An isolated
tornado can`t be ruled out as well. The best chance for severe
storms will be over the plains east of Denver. However, the threat
for severe storms includes the lower foothills east to the Kansas
and Nebraska borders.

An area of very heavy rain may form late tonight near a
developing upper level low. The location for the very heavy rain
is highly uncertain at this time and may occur anywhere over
northeast Colorado, southeast Wyoming, or southwest Nebraska.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Moderate to heavy rainfall will be possible primarily north of
line from around Denver to Akron on Saturday, with less intense
rainfall south towards the Palmer Divide. Heavy snow potential
will exist particularly in the mountains of western Larimer and
western Boulder counties where the strongest northeasterly upslope
will occur. In the warmer foothills of Larimer and Boulder
counties, the heavy rainfall will elevate the risk of flooding.

Precipitation will gradually decrease Saturday night as a slow
moving storm system starts to shift to the northeast. It will be
drier on Sunday with a chance of showers and thunderstorms mainly
over the higher terrain by the afternoon hours. Temperatures will
be cooler this weekend, then warm up again early next week with a
chance of afternoon and evening thunderstorms each day.


Spotter activation will be needed after 1 PM today.


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