Severe Thunderstorm Warning 104, NWS Denver/Boulder, CO

754 
WWUS55 KBOU 190246
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
846 PM MDT MON JUN 18 2018

COC123-190255-
/O.CAN.KBOU.SV.W.0104.000000T0000Z-180619T0300Z/
Weld CO-
846 PM MDT MON JUN 18 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL WELD COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight MDT for
northeastern Colorado.

LAT...LON 4021 10415 4040 10415 4050 10401 4022 10382
TIME...MOT...LOC 0245Z 257DEG 19KT 4029 10412 

$$

COC087-190300-
/O.CON.KBOU.SV.W.0104.000000T0000Z-180619T0300Z/
Morgan CO-
846 PM MDT MON JUN 18 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MDT
FOR NORTHWESTERN MORGAN COUNTY...

At 845 PM MDT, a severe thunderstorm was located near Orchard, or 17
miles west of Fort Morgan, moving east at 20 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Wiggins, Jackson Reservoir, Orchard, Weldona and Goodrich. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4021 10415 4040 10415 4050 10401 4022 10382
TIME...MOT...LOC 0245Z 257DEG 19KT 4029 10412 

HAIL...1.00IN
WIND...<50MPH
 
$$

SCHLATTER

942 
WWUS55 KBOU 190256
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
856 PM MDT MON JUN 18 2018

COC087-190305-
/O.EXP.KBOU.SV.W.0104.000000T0000Z-180619T0300Z/
Morgan CO-
856 PM MDT MON JUN 18 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MORGAN COUNTY
WILL EXPIRE AT 900 PM MDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire.  However small 
hail up to the size of marbles and frequent lightning will occur 
with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until midnight MDT for
northeastern Colorado.

LAT...LON 4021 10415 4040 10415 4050 10401 4022 10382
TIME...MOT...LOC 0255Z 257DEG 19KT 3994 10490 

$$

SCHLATTER

Area Forecast Discussion
National Weather Service Denver/Boulder CO
823 PM MDT Mon Jun 18 2018

.UPDATE...
Issued at 823 PM MDT Mon Jun 18 2018

Thunderstorms will continue to roll east across northeast
Colorado this evening and even after midnight. Mix layer CAPE from
the RAP are 1000-2500 J/kg north of I-70 through the evening, so
expect the severe threat to continue through most of the evening.
Not easy to pick out on water vapor satellite imagery, but appears
there is a wave helping to produce the thunderstorms. Low clouds
will reform late tonight and Tuesday morning. There will also be
some drizzle and patchy fog with this, mainly 3am-9am.

More thunderstorms are expected Tuesday. Left exit region of the
jet will help provide lift. The latest RAP shows surface based
CAPEs 2000-2500 J/kg with mid 70s temperatures and upper 50s for
dew points. Shear will again be favorable for super cells. This
will lead to a good chance for another round of severe storms
Tuesday afternoon and evening.

&&

.SHORT TERM...(This evening through Tuesday)
Issued at 340 PM MDT Mon Jun 18 2018

This afternoon into the evening, storms are expected to
predominantly form north of a line from the northern fringes for
the Palmer Divide to Akron. With slight QG ascent and the Denver
Cyclone ramping up and providing enough lift for the moist
atmosphere to develop some vigorous storms. CAPE values are
expected to reach 1500- 1700 J/kg which will allow for large hail
and damaging winds. Both low level and bulk shear are forecast to
be sufficient for potential tornado formation. When looking at
guidance for the duration of showers and storms the GFS, NAM, and
European models show precipitation continuing this evening through
Tuesday night with much more areal coverage, while the HRRR and
RAP end things early Tuesday morning with more isolated drizzle on
the plains near the Front Range Foothills. I am leaning toward
the models that end convection earlier and bring in stratus and
drizzle to start the morning as the atmosphere should become more
stable with the stratus moving in. The GFS and NAM show the QG
increasing, so will keep a slight chance in the grids.

Tonight stratus is expected to move back onto the plains and
remain until mid to late morning. This could cause drizzle similar
to what we experienced this morning. Once the could cover burns
off, high temperatures are expected to reach around 70 degrees in
Denver. If clouds dissipate earlier than expected, surface heating
could allow for warmer high temperatures. Tuesday there will
bring a chance for severe storms over the far eastern plains.
Another batch of stronger QG ascent will be present over the
eastern portion of the CWA. The GFS also indicates a 700mb trough
with associated upslope winds, and increasing PWs due to southerly
flow into the area. CAPE values will also increase with lower
700-500mb temperatures Tuesday.

.LONG TERM...(Tuesday night through Monday)
Issued at 340 PM MDT Mon Jun 18 2018

A moderate westerly flow aloft will be over the region on Tuesday
night with a closed upper low over swrn MT/nwrn WY. Good moisture
and instability over the northeast plains of CO with severe
thunderstorm potential carrying over into Tuesday evening. Layer
precipitable water values still around 1.5 inches over the
northeast plains, with heavy rain still an issue with the
developing thunderstorms. Storm motions by Tuesday evening,
west/northwest around 20 mph. Focus for the heaviest rainfall
Tuesday night appears to be east over central KS/NE. Wednesday and
Wednesday night, the upper trough will shift southeast into
central NE on Wednesday, with a building ridge centered over Baja
CA. End result will be a moderate northwesterly flow aloft over
the cwa. A cold front will push into the area from the northeast
on Wednesday morning, with anticyclonic low level low level
upslope developing in the afternoon and evening. Increasing
stability behind the front will diminish the potential for severe
thunderstorms. Fcst soundings generate CAPES around 400 j/kg in
the afternoon, a far cry from those on Tuesday. Best chance for
storms will be along the elevated terrain, in and near the Front
Range Foothills and Palmer Divide. There does appear to be a
passing jet max overhead around 00Z Thu which could help initiate
thunderstorms Wednesday evening. Precipitable water value only
around 0.25 inch west of the Continental Divide, but still range
from 0.50-1.0 inch over the northeast plains. On Thursday,
increasing mid level subsidence associated with building ridge
axis over western CO, and low level stability associated with the
sfc high will nix the CAPES across the northeast plains in the
afternoon and evening. Temperatures will be closer to normal on
Thursday. Friday and Saturday, a return to warmer and drier
weather across the region. The upper level ridge will remain over
the region on Friday with a dry westerly flow aloft. A weak system
will pass to the north and east of CO Friday night, with a
generally dry northwesterly flow aloft. There could be a weak and
shallow cold frontal push into the northeast plains, Saturday
morning but it should not be around for very long. Some qpf
primarily over the higher terrain Saturday. Another upper low
dropping into the western WY/nrn UT could allow for more showers
and thunderstorms into the region late Saturday and Sunday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 823 PM MDT Mon Jun 18 2018

The threat for thunderstorms will continue through about 06Z at
KDEN and end around 04Z at KBJC. At KAPA, threat for thunderstorms
is low. HRRR does show a few storms after 06Z over northern
Colorado, so the chance for storms is not zero but will be low.
Low clouds will reform around 09Z with ceiling falling below 1000
feet. Good chance ceilings fall below 500 feet with visibility
around a mile or less. Low clouds will be slow to burn off again
and are expected to persist until around 18Z. Another round of
thunderstorms will move across the area Tuesday afternoon and
evening.

&&

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

UPDATE...Meier
SHORT TERM...Sullivan
LONG TERM...Cooper
AVIATION...Meier

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1024 AM MDT Mon Jun 18 2018

COZ030>051-191630-
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-
1024 AM MDT Mon Jun 18 2018

...Strong storms possible over Denver Metro Area and areas north
and east this afternoon...

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

.DAY ONE...Today and Tonight

Low clouds and patchy fog and drizzle will continue to diminish
late this morning across the area.

Attention switches to this afternoon when the clouds will burn
off, sufficient heating and moisture will combine with a
developing Denver Cyclone. Scattered thunderstorms will develop
near the convergence zone south of this cyclone as well as over
the Front Range foothills. As of now, this looks to occur by
2 pm before spreading northeast across the rest of the plains. A
few storms may become severe with large hail up to 2 inches in
diameter along with damaging winds and heavy rain. The convergence
zone and shear above this will also allow for a chance of an
isolated tornado or two. The best chance for severe storms will
stretch along and north of a line from south Denver to Akron.
Over the far northeast plains, the airmass will be more stable
with lesser chances of a severe storm, however the synoptic
situation and convective activity pushing east may allow the
storms to last through the evening. Expect another push of low
clouds and patchy fog towards Tuesday morning over the plains.

Further west of the Continental Divide, the airmass will be warm
and dry with no thunderstorms expected.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Scattered showers and thunderstorms are expected on Tuesday, with
some late day storms on the plains capable of large hail, strong
winds and locally heavy rainfall. The heavy rainfall may produce
flooding in low lying areas such as along drainages and dry
washes. Storm chances will decrease on Wednesday, then dry and
warmer Thursday and Friday. Storms may return for the weekend
with the passage of a weak upper level weather disturbance.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed today, after 1pm.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
757 PM MDT MON JUN 18 2018

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

0746 PM     HAIL             1 NNW LOUISVILLE        39.99N 105.15W
06/18/2018  M2.00 INCH       BOULDER            CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
758 PM MDT MON JUN 18 2018

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

0757 PM     HAIL             1 S LAFAYETTE           39.99N 105.10W
06/18/2018  M1.50 INCH       BOULDER            CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
802 PM MDT MON JUN 18 2018

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

0800 PM     HAIL             1 N ERIE                40.04N 105.04W
06/18/2018  M1.00 INCH       WELD               CO   PUBLIC

            REPORT VIA TWITTER.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
810 PM MDT MON JUN 18 2018

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

0752 PM     HAIL             1 N LAFAYETTE           40.01N 105.10W
06/18/2018  M2.50 INCH       BOULDER            CO   TRAINED SPOTTER

&&

TLH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
812 PM MDT MON JUN 18 2018

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

0752 PM     HAIL             1 N LAFAYETTE           40.01N 105.10W
06/18/2018  M2.50 INCH       BOULDER            CO   TRAINED SPOTTER

            SHATTERED VEHICLE WINDSHIELDS.

&&

TLH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
823 PM MDT MON JUN 18 2018

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

0823 PM     HAIL             2 S ROCKY FLATS         39.87N 105.20W
06/18/2018  M1.75 INCH       JEFFERSON          CO   TRAINED SPOTTER

            REPORT VIA TWITTER.

&&