Severe Thunderstorm Warning 58, NWS Denver/Boulder, CO

Area Forecast Discussion
National Weather Service Denver/Boulder CO
929 PM MDT Mon Jun 8 2020

.UPDATE...
Issued at 841 PM MDT Mon Jun 8 2020

Winds topped 60 mph this evening in few locations as the cold
front moved across the plains. The leading edge of the front is
moving into western Washington, as well as northern portions of
Elbert and Lincoln counties at this time. Some timing adjustments
may be needed regarding thunderstorms and showers around or
after this evening and overnight. Strong northerly winds expected
to continue overnight as the surface pressure gradient continues
to strengthen. Overall however, do not expect to make any
significant changes to the ongoing forecast. Snow showers already
going on the high country, especially in the mountains north of
I-70. Should start to see showers and thunderstorms spreading
south and east into the Denver area and adjacent plains late
evening and overnight.

&&

.SHORT TERM...(This evening through Tuesday)
Issued at 330 PM MDT Mon Jun 8 2020

The stage is setting up for an active evening as surface pressures
over southeast Colorado continue to drop and a frontal boundary
appears to be setting up over north central Colorado and southeast
Wyoming. This cold front is forecast to race down across the
plains this evening as an upper trough ejects over the state later
tonight. When the cold front gets moving, it is going to be driven
by very strong pressure rises, on the order of 15 mb/3 hours
around midnight. Strong northerly winds will follow the front and
a precipitation shield of moderate intensity will develop over
the northeast Colorado plains. Rain on the plains is expected to
continue well into Tuesday as the northerly winds gradually
diminish. A High Wind Warning will be in effect across the plains
tonight and through much of Tuesday.

In the mountains, temperatures will be cold enough for moderate
snow to fall above 9500 feet. Highway pass levels could see 4 to 8
inches of accumulation, with even higher amounts on peaks. Snow
levels could drop down to 7500 feet or so, but with little
accumulation below 9000 feet. A Winter Weather Advisory will be in
effect for the mountain zones.

.LONG TERM...(Tuesday night through Monday)
Issued at 330 PM MDT Mon Jun 8 2020

Extended period quiets down after a bumpy weekend and start to the
week. Departing upper low crosses Kansas Tuesday night, with much of
the forecast area under north to northwest gradient flow. Tail end
of 50+ kt 700 mb jet still clipping the northeast corner of Colorado
Tuesday night, however stabilizing boundary layer should keep those
winds from mixing down to the surface as Tuesday night progresses.
Nevertheless have mixed in some higher wind speeds right at 00z
Wednesday before things calm down.

Wednesday into Thursday a broad flat upper ridge develops over the
western US, with dry conditions and a warming trend. Ridge sharpens
Friday into Saturday as a trough approaches the west coast. Rising
heights aloft and a lee trough develops to create warmer
temperatures and strengthening southerly flow on the plains.
Temperatures continuing to rise to low to mid 90s in eastern
Colorado heading into the weekend. The western US low moves
onshore over the Pacific NW Saturday, shifting ridge east and
opening Colorado up to south to southwesterly flow with more
moisture moving in. Next chances for precip will be late Saturday
when a weak wave moves across the state in southwest flow with
chances for mountain showers and thunderstorms. Chances for
mountain showers/thunderstorm persist Sunday and Monday with
terrain forcing and available moisture.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 841 PM MDT Mon Jun 8 2020

Strong northerly winds expected to continue following the passage
of the cold front. Gusts of 45 to 55 knots will be possible this
evening, but strong wind gusts 35 to 45 kts will continue
overnight. Rain showers and possibly a few embedded thunderstorms
are also expected overnight. ILS restrictions after midnight with
ceiling 045-055 ft AGL. Could see MVFR/IFR ceiling restriction
008-015 ft AGL after midnight once the rain showers develop. Rising
ceilings and an end to precipitation should occur after 9 AM on
Tuesday.

&&

.FIRE WEATHER...
Issued at 841 PM MDT Mon Jun 8 2020

The Red Flag Warning for South Park and southern Lincoln county
has expired.
&&

.BOU WATCHES/WARNINGS/ADVISORIES...
High Wind Warning until 6 PM MDT Tuesday for COZ046>051.

Winter Weather Advisory until noon MDT Tuesday for COZ031-033-
034.

High Wind Warning until 6 AM MDT Tuesday for COZ038>045.

&&

UPDATE...Cooper
SHORT TERM...Dankers
LONG TERM...Hanson
AVIATION...Cooper
FIRE WEATHER...Cooper

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1111 AM MDT Mon Jun 8 2020

COZ030>051-091715-
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-
1111 AM MDT Mon Jun 8 2020

...HIGH FIRE DANGER PARK COUNTY AND SOUTHERN LINCOLN COUNTY...
...HIGH WINDS FOR NORTHEAST COLORADO PLAINS TONIGHT AND
TUESDAY...

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

.DAY ONE...This Afternoon and Tonight

Warm temperatures and gusty winds will increase the fire danger
over Park County and the southern portions of Lincoln County
through this afternoon. Burning is not recommended in these
areas.

This evening, a strong cold front will move over the northeast
Colorado plains bringing high winds and then rainfall overnight.
Northerly winds gusting up to 50 to 60 mph will be possible from
the Wyoming border down to the Palmer Divide through the evening
hours. Areas of blowing dust may be encountered as the cold front
moves through. Power outages and tree damage will be possible. The
rain that develops later in the evening will help to settle the
dust picked up by the wind.

Mountain areas will also get a taste of Winter overnight with
light to moderate snow starting in the evening and continuing
overnight. Snow accumulations of 4 to 9 inches will be possible at
elevations above 9000 feet. Travelers are urged to slow down as
roads could become slushy and slippery.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Strong northwest winds will continue over the eastern plains of
Colorado on Tuesday with gusts up to 60 mph. Showers will end
from west to east by midday Tuesday as the strong weather system
moves out of the state. Much cooler temperatures are expected on
Tuesday with highs only in the 60s over lower elevations.

Dry conditions along with a warming trend are expected Wednesday
and Thursday and then a slight chance of late day showers and
thunderstorms return Friday through the weekend. and Saturday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today and tonight, however
high wind and damage reports will be appreciated.

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PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
1015 PM MDT MON JUN 8 2020

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

1012 PM     HAIL             2 WNW FORT COLLINS      40.56N 105.11W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

1010 PM     HAIL             4 SW TIMNATH            40.48N 105.04W
06/08/2020  M0.88 INCH       LARIMER            CO   TRAINED SPOTTER

1008 PM     HAIL             1 W TIMNATH             40.52N 105.00W
06/08/2020  U0.75 INCH       LARIMER            CO   PUBLIC

0932 PM     NON-TSTM WND GST 2 W KEENESBURG          40.11N 104.57W
06/08/2020  M64 MPH          WELD               CO   MESONET

            MESONET STATION CO038 076E037 KEENESBURG.

0930 PM     NON-TSTM WND GST 1 E LIMON               39.27N 103.67W
06/08/2020  M70 MPH          LINCOLN            CO   ASOS

            ASOS STATION KLIC LIMON.

0910 PM     HAIL             TIMNATH                 40.53N 104.98W
06/08/2020  M1.00 INCH       LARIMER            CO   PUBLIC

0907 PM     HAIL             WINDSOR                 40.48N 104.91W
06/08/2020  M0.88 INCH       WELD               CO   NWS EMPLOYEE

0905 PM     NON-TSTM WND GST 3 WSW STERLING          40.62N 103.27W
06/08/2020  M59 MPH          LOGAN              CO   AWOS

            AWOS STATION KSTK STERLING.

0905 PM     HAIL             3 SW WINDSOR            40.46N 104.95W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

0858 PM     HAIL             2 WSW KELIM             40.39N 104.98W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

0853 PM     NON-TSTM WND GST AKRON                   40.17N 103.22W
06/08/2020  M68 MPH          WASHINGTON         CO   ASOS

            ASOS STATION KAKO AKRON.

0852 PM     HAIL             3 SE LOVELAND           40.40N 105.03W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

0845 PM     NON-TSTM WND GST 2 SE STRASBURG          39.72N 104.28W
06/08/2020  M60 MPH          ARAPAHOE           CO   MESONET

            MESONET STATION DW9756 STRASBURG.

0830 PM     NON-TSTM WND GST 5 N PAWNEE PASS         40.70N 103.48W
06/08/2020  M60 MPH          LOGAN              CO   AWOS

            AWOS STATION K1MW MIKE MADIS.

0815 PM     NON-TSTM WND GST FORT MORGAN AIRPORT     40.33N 103.80W
06/08/2020  M61 MPH          MORGAN             CO   AWOS

            AWOS STATION KFMM FORT MORGAN.

0808 PM     TSTM WND GST     5 N PAWNEE BUTTES       40.88N 104.00W
06/08/2020  M63 MPH          WELD               CO   AWOS

            AWOS STATION K1OW OSCAR MADIS.

0752 PM     NON-TSTM WND GST 2 ENE WIGGINS           40.25N 104.04W
06/08/2020  M58 MPH          MORGAN             CO   MESONET

            MESONET STATION CO039 076W067 WIGGINS BIJOU
            CREEK.

0744 PM     NON-TSTM WND GST 2 SSE CENTENNIAL        39.57N 104.85W
06/08/2020  M59 MPH          ARAPAHOE           CO   ASOS

            ASOS STATION KAPA DENVER ARAPAHOE.

0742 PM     TSTM WND GST     1 NNW BRIGGSDALE        40.64N 104.33W
06/08/2020  M62 MPH          WELD               CO   MESONET

            MESONET STATION CO043 014W176 BRIGGSDALE.

0740 PM     NON-TSTM WND DMG 3 SW AURORA             39.68N 104.86W
06/08/2020                   ARAPAHOE           CO   PUBLIC

            1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN
            OFF.

0643 PM     HAIL             2 SE GRANBY             40.07N 105.91W
06/08/2020  M0.88 INCH       GRAND              CO   PUBLIC

&&

Special Weather Statement
National Weather Service Denver CO
1043 PM MDT Mon Jun 8 2020

COZ042-044-048-049-090545-
Washington County CO-Morgan County CO-Logan County CO-
Northeast Weld County CO-
1043 PM MDT Mon Jun 8 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN WELD...NORTHEASTERN
MORGAN...NORTH CENTRAL WASHINGTON AND LOGAN COUNTIES UNTIL 1145 PM
MDT...

At 1042 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 4 miles southwest of Willard to 6 miles
southwest of Akron, or along a line extending from 20 miles southwest
of Sterling to 31 miles west of Yuma. Movement was north at 30 mph.

Nickel size hail will be possible with these storms. Hail may
accumulate on roadways causing hazardous travel.

Locations impacted include...
Sterling, Akron, Merino, Iliff, Peetz, Prewitt Reservoir, Padroni,
Atwood, North Sterling Reservoir, Willard, Westplains, Burdett, Logan
Corners, Midway and Pawnee Pass.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare for sudden gusty winds. Secure loose objects and move to a
safe shelter inside a building or vehicle.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4034 10294 3999 10336 4051 10360 4100 10387
      4100 10305
TIME...MOT...LOC 0442Z 175DEG 18KT 4050 10355 4011 10332

COOPER

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
1136 PM MDT MON JUN 8 2020

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

0932 PM     NON-TSTM WND GST 2 W KEENESBURG          40.11N 104.57W
06/08/2020  M64 MPH          WELD               CO   MESONET

            MESONET STATION CO038 076E037 KEENESBURG.

0907 PM     HAIL             WINDSOR                 40.48N 104.91W
06/08/2020  M0.88 INCH       WELD               CO   NWS EMPLOYEE

0808 PM     TSTM WND GST     5 N PAWNEE BUTTES       40.88N 104.00W
06/08/2020  M63 MPH          WELD               CO   AWOS

            AWOS STATION K1OW OSCAR MADIS.

0742 PM     TSTM WND GST     1 NNW BRIGGSDALE        40.64N 104.33W
06/08/2020  M62 MPH          WELD               CO   MESONET

            MESONET STATION CO043 014W176 BRIGGSDALE.

0853 PM     NON-TSTM WND GST AKRON                   40.17N 103.22W
06/08/2020  M68 MPH          WASHINGTON         CO   ASOS

            ASOS STATION KAKO AKRON.

0815 PM     NON-TSTM WND GST FORT MORGAN AIRPORT     40.33N 103.80W
06/08/2020  M61 MPH          MORGAN             CO   AWOS

            AWOS STATION KFMM FORT MORGAN.

1050 PM     HAIL             STERLING                40.63N 103.21W
06/08/2020  M1.00 INCH       LOGAN              CO   TRAINED SPOTTER

0905 PM     NON-TSTM WND GST 3 WSW STERLING          40.62N 103.27W
06/08/2020  M59 MPH          LOGAN              CO   AWOS

            AWOS STATION KSTK STERLING.

0830 PM     NON-TSTM WND GST 5 N PAWNEE PASS         40.70N 103.48W
06/08/2020  M60 MPH          LOGAN              CO   AWOS

            AWOS STATION K1MW MIKE MADIS.

0930 PM     NON-TSTM WND GST 1 E LIMON               39.27N 103.67W
06/08/2020  M70 MPH          LINCOLN            CO   ASOS

            ASOS STATION KLIC LIMON.

1012 PM     HAIL             2 WNW FORT COLLINS      40.56N 105.11W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

1010 PM     HAIL             4 SW TIMNATH            40.48N 105.04W
06/08/2020  M0.88 INCH       LARIMER            CO   TRAINED SPOTTER

1008 PM     HAIL             1 W TIMNATH             40.52N 105.00W
06/08/2020  U0.75 INCH       LARIMER            CO   PUBLIC

0910 PM     HAIL             TIMNATH                 40.53N 104.98W
06/08/2020  M1.00 INCH       LARIMER            CO   PUBLIC

0905 PM     HAIL             3 SW WINDSOR            40.46N 104.95W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

0858 PM     HAIL             2 WSW KELIM             40.39N 104.98W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

0852 PM     HAIL             3 SE LOVELAND           40.40N 105.03W
06/08/2020  M0.75 INCH       LARIMER            CO   PUBLIC

0643 PM     HAIL             2 SE GRANBY             40.07N 105.91W
06/08/2020  M0.88 INCH       GRAND              CO   PUBLIC

1037 PM     HAIL             3 S LONGMONT            40.13N 105.11W
06/08/2020  M0.75 INCH       BOULDER            CO   PUBLIC

            REPORT FROM MPING: DIME (0.75 IN.).

0845 PM     NON-TSTM WND GST 2 SE STRASBURG          39.72N 104.28W
06/08/2020  M60 MPH          ARAPAHOE           CO   MESONET

            MESONET STATION DW9756 STRASBURG.

0744 PM     NON-TSTM WND GST 2 SSE CENTENNIAL        39.57N 104.85W
06/08/2020  M59 MPH          ARAPAHOE           CO   ASOS

            ASOS STATION KAPA DENVER ARAPAHOE.

0740 PM     NON-TSTM WND DMG 3 SW AURORA             39.68N 104.86W
06/08/2020                   ARAPAHOE           CO   PUBLIC

            1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN
            OFF.

&&

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