Alert archive / Colorado / Special Weather Statements in 2020

Special Weather Statement, NWS Denver/Boulder, CO

May 19, 2020Lincoln County, Colorado

NWS Denver/Boulder, CO issued this special weather statement at May 19, 2020, 9:25 PM MDT for Lincoln County, Colorado. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 19, 2020, 9:25 PM MDT (03:25 UTC)
Expired
May 19, 2020, 10:00 PM MDT
In force
35 min
Issued by
NWS Denver/Boulder, CO

County Lincoln County, CO

The radar

The Pueblo radar (KPUX), 90 km from the middle of the area, began a volume at 03:25 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 3.4 hours before the alert went out and 118 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2020-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2020-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
14 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
3793 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this special weather statement went out at May 19, 7:43 PM MDT, 1 hour 42 minutes earlier.

Area forecast discussion, May 19, 7:43 PM MDT, 1 hour 42 minutes before
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Hazardous weather outlook, May 19, 11:05 AM MDT, 10 hours 20 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1105 AM MDT Tue May 19 2020

COZ030>051-201715-
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-
1105 AM MDT Tue May 19 2020

...RED FLAG WARNING IN EFFECT TODAY AND TOMORROW FOR SOUTH
PARK...SOUTHERN FOOTHILLS AND PALMER DIVIDE...

...SEVERE STORM THREAT INCREASES INTO WEDNESDAY...

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

.DAY ONE...Today and Tonight

Low humidity and gusty winds will spread over the high country,
southern foothills and Palmer Divide today where drier vegetation
will create high fire danger. Isolated to scattered thunderstorms
will be high based over these areas as well, with a slight chance
of dry lightning. Any outdoor burning is highly discouraged as
fire spread would be rapid.

Thunderstorms across the high terrain will move east this
afternoon into the plains. These showers and storms could produce
wind gusts up to 60 mph and small hail. Large hail up to 1 inch in
diameter will be possible over Larimer and Weld Counties.

South-southeasterly winds across the far eastern plains will be
strong all afternoon and into the evening, with sustained speeds
of 20 to 30 mph and gusts up to 40 mph.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Severe thunderstorms will be possible over portions of northeast
Colorado late Wednesday afternoon through Wednesday evening. A
dryline will become better defined across the northeast plains
Wednesday afternoon. That will most likely set up from
northeastern Weld County/Logan County through the Fort Morgan area
and then down toward Limon. That should be the focus for
thunderstorm development. Sufficient wind shear and instability
will support the threat of large hail, damaging winds, and even a
couple tornadoes.

Further west, fire danger will continue to be an issue with low
humidity and strong gusty winds. Most areas will see wind gusts of
30 to 40 mph, with gusts around 45 mph across the Palmer Divide.

The rest of the week into the weekend will feature a couple
chances of showers and storms, but no severe weather is expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight.

In the hours before

Special weather statement, May 19, 4:54 PM MDT, 4 hours 31 minutes before
Special Weather Statement
National Weather Service Denver CO
454 PM MDT Tue May 19 2020

COZ033-035-192330-
Larimer and Boulder Counties Between 6000 and 9000 Feet CO-
South and East Jackson/Larimer/North and Northeast Grand/Northwest
Boulder Counties Above 9000 Feet CO-
454 PM MDT Tue May 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL LARIMER COUNTY
UNTIL 530 PM MDT...

At 453 PM MDT, Doppler radar was tracking a strong thunderstorm over
Red Feather Lakes, or 31 miles northwest of Fort Collins, moving
northeast at 40 mph.

Wind gusts of 50 to 55 mph will be possible with this storm.

Locations impacted include...
Rustic, Cherokee Park, Virginia Dale and Red Feather Lakes.

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 this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4066 10549 4074 10575 4100 10559 4100 10525
TIME...MOT...LOC 2253Z 205DEG 35KT 4081 10558

RPK
Special weather statement, May 19, 4:59 PM MDT, 4 hours 26 minutes before
Special Weather Statement
National Weather Service Denver CO
459 PM MDT Tue May 19 2020

COZ035-038-192330-
Larimer and Boulder Counties Between 6000 and 9000 Feet CO-
Larimer County Below 6000 Feet/Northwest Weld County CO-
459 PM MDT Tue May 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WELD AND
NORTHEASTERN LARIMER COUNTIES UNTIL 530 PM MDT...

At 459 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles southeast of Crystal Lake Campground to
5 miles southeast of Livermore, or along a line extending from 13
miles west of Cheyenne to 14 miles north of Fort Collins. Movement
was north at 35 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Wellington, Carr, Natural Fort, Poudre Park, Livermore and Teds
Place.

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 4100 10484 4064 10492 4064 10531 4100 10529
TIME...MOT...LOC 2259Z 200DEG 29KT 4110 10505 4076 10513

RPK
Special weather statement, May 19, 5:14 PM MDT, 4 hours 11 minutes before
Special Weather Statement
National Weather Service Denver CO
514 PM MDT Tue May 19 2020

COZ041-044>047-200000-
Elbert/Central and East Douglas Counties Above 6000 Feet CO-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County CO-Morgan County CO-
Southeast Elbert County Below 6000 Feet/South Lincoln County CO-
Central and East Adams and Arapahoe Counties CO-
514 PM MDT Tue May 19 2020

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN ELBERT...EASTERN
ARAPAHOE...SOUTHWESTERN MORGAN...EASTERN ADAMS AND SOUTHWESTERN
LINCOLN COUNTIES UNTIL 600 PM MDT...

At 513 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 3 miles north of Leader to 13 miles south of
Truckton, or along a line extending from 24 miles southwest of Fort
Morgan to 33 miles northeast of Pueblo. Movement was north at 35 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
these storms.

Locations impacted include...
Simla, Deer Trail, Hoyt, Shamrock, Leader, Matheson, Adena, Agate,
Twelve-Mile Corner, Cottonwood Valley and Kutch.

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 3913 10405 3913 10415 4000 10418 4000 10415
      4011 10415 4010 10368 3853 10379 3853 10405
TIME...MOT...LOC 2313Z 186DEG 31KT 3995 10405 3854 10409

RPK
Special weather statement, May 19, 6:29 PM MDT, 2 hours 56 minutes before
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Special weather statement, May 19, 6:45 PM MDT, 2 hours 40 minutes before
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Special weather statement, May 19, 9:25 PM MDT, 0 minutes before
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The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 19, 6:29 PM MDTSpecial Weather StatementBOUWeld31 min
May 19, 6:45 PM MDTSpecial Weather StatementBOUDenver30 min
May 20, 1:02 AM MDTSpecial Weather StatementBOULogan, Morgan, Washington43 min

Nearby

Special Weather Statements in Colorado, 2020Every special weather statement in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.