Severe Thunderstorm Warning 206, NWS Denver/Boulder, CO

Area Forecast Discussion
National Weather Service Denver/Boulder CO
1249 PM MDT Thu Aug 6 2020

.SHORT TERM...(This evening through Friday)
Issued at 1231 PM MDT Thu Aug 6 2020

Water vapor satellite imagery showing very dry air over the Great
Basin and Desert southwest. Southwest flow around the upper level
ridge center over the region will transport this drier air into
Colorado. However, ahead of it, there will be one last round of
afternoon and early evening showers and thunderstorms. The airmass
has dried a little already along the Front Range and near by
plains. Because of this, MLCAPE is less the 500 J/kg. These storms
will be capable of brief moderate to heavy rain and gusty outflow
winds to 50 mph. As these storms progress eastward, they will
encounter better moisture that resides east of a surface trough.
Here, MLCAPE is around 1500 J/kg. Weak shear should keep most of
these storms sub- severe, but heavy rain, small hail, and gusty
outflow winds will accompany the stronger storms. Can't rule out a
couple brief severe storms with large hail and wind gusts to 60
mph. The convection continues to progress eastward through the
evening will be east of the state by midnight.

Skies will clear overnight as the drier air spreads across the
state. On Friday, clear to mostly clear skies will prevail through
the day. With precipitable water values less than a half inch,
don't expect any showers and thunderstorms during the afternoon.
At best, expect a few to scattered high based cumulus clouds.
Because of the drier airmass and increased sunshine, expected
warmer temperatures. Highs across northeast Colorado should reach
the mid to upper 90s.

.LONG TERM...(Friday night through Thursday)
Issued at 1231 PM MDT Thu Aug 6 2020

The longer term is going to be characterized with hot and
mainly dry conditions through the early part of next week.
Temperatures will be in the 90s across the plains with only slight
chances of late day storm, mainly mountains and far northeast
plains.

Colorado will return to a drier west and southwest flow aloft with
high pressure ridge aloft covering much of the southern portions of
the United States. Friday evening looks completely dry across the
county warning area with mainly clear skies.

For Saturday, mostly dry, though the NAM showing a weak frontal
boundary which may flirt across the far northeast plains with a
bit higher low level moisture there. Park county may be the other
area which has a shot of a late day storm with a some increase in
moisture from the southwest. If showers do develop over the
mountains expect mainly high based showers with gusty winds the
main threat. Sunday looks very similar to Saturday with only an
ever so slight chance for a late day storm in mountains south of
Interstate 70 corridor.

Not much change into the middle of next week with light westerly
flow with only slight chance of late day storms and continued very
warm to hot conditions. Possibly a bit better moisture available
towards the end of next week with better moisture available with
more favorable flow from the southwest.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1231 PM MDT Thu Aug 6 2020

Scattered showers and thunderstorms will continue form and track
eastward this afternoon. Gusty outflow winds, brief moderate to
heavy rain, and small hail are expected with the strongest storms.
A couple wind shifts due to the gusty outflow winds are expected.
The showers and storms should push east of the Denver area by 00Z
with southeast winds prevailing behind the convection. Winds
eventually become southerly by 06Z. For Friday, mostly clear skies
are expected due to a very dry airmass.

&&

.FIRE WEATHER...
Issued at 1231 PM MDT Thu Aug 6 2020

Very warm and dry conditions will prevail this afternoon and
again Friday afternoon. Relative humidities are expected to bottom
out in the 5 to 12 percent range over the mountains and mountain
valleys. Winds in the 500-700mb layer still less than 20 knots
each day, so expect wind gusts to stay below the 25 mph need for
Red Flag criteria. A few gusts to 30 to 40 mph will be possible
with the showers and thunderstorms this afternoon. For Friday, no
showers or storms are expected due to the very dry airmass.

There will be elevated fire danger over the weekend with dry
conditons over North and Middle Parks but lack of any strong winds
will keep conditions at a manageable level with afternoon breezes
mainly around/under 20 mph.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
None.
&&

SHORT TERM...Meier
LONG TERM...Entrekin
AVIATION...Meier
FIRE WEATHER...Meier

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1051 AM MDT Thu Aug 6 2020

COZ030>051-071700-
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-
1051 AM MDT Thu Aug 6 2020

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

.DAY ONE...Today and Tonight

Isolated to scattered showers and thunderstorms are expected to
develop today over the mountains and foothills by early afternoon.
They will move eastward onto the plains by mid afternoon. The
stronger storms will be found over the eastern plains where heavy
rain, wind gusts to 45 mph, and hail up to three quarters of an
inch in diameter will be possible. A severe thunderstorm or two
can't be ruled out as well.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

Hot and dry weather is expected over the weekend with increasing
fire danger. There may be an isolated severe thunderstorm near
the northeast corner of Colorado late Saturday. Isolated
thunderstorms will return by the middle of next week, but mainly
over the mountains and near the eastern border.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
408 PM MDT THU AUG 6 2020

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

0255 PM     TSTM WND DMG     4 SSE BYERS             39.66N 104.19W
08/06/2020                   ARAPAHOE           CO   TRAINED SPOTTER

            SEVERAL FOUR INCH DIAMETER TREE BRANCHES
            BROKEN, ALONG WITH A FEW DEAD TREES BLOWN
            DOWN. ESTIMATED GUSTS OVER 60MPH.

&&

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