River Flood Advisory 2, NWS Denver/Boulder, CO

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Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1120 AM MDT Thu May 11 2023

COZ030>051-121730-
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-
1120 AM MDT Thu May 11 2023

...A Flood Watch is in effect through late tonight for the
northern Front Range Foothills, I-25 Corridor, and northeast
plains of Colorado...

...Severe threat for the northeast plains...

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

.DAY ONE...Today and Tonight

Rain and thunderstorms will continue across the foothills, I-25
Corridor, and northeast plains, leading to possible flooding of
low lying areas and streams. Rivers will also rise due to the
amount of rain, with another 1-2 inches expected in many
locations. Rain should taper off over the northeast plains
overnight, but continue along the I-25 Corridor.

Severe weather and a couple tornadoes will be possible over the
northeastern plains. The highest risk of tornadoes would be east
of a line from Sterling to Akron this afternoon. Tornadoes may be
short-lived and difficult to see due to heavy rainfall.
Meanwhile, large hail and high winds are not a significant threat
at this time.

Snow will occur above 9,500 feet, with accumulations of 8-16
inches likely for the higher mountains. Snow levels may
occasionally dip to 8,000 feet or so with heavier showers, with
some accumulation above that especially above Conifer and through
South Park.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Rain and mountain snow will decrease and come to an end later
Friday afternoon as the storm system slowly exits the region.
There will be a chance for showers and thunderstorms this weekend
and into early next week. Additional heavy precipitation is not
expected, but rivers and streams are expected to be running high
due to the recent rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required on the eastern plains of
Colorado this afternoon.