Alert archive / Colorado / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 54, NWS Denver/Boulder, CO

June 7, 2019Morgan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 7, 2019, 3:02 PM MDT for Morgan County, Colorado. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 7, 2019, 3:02 PM MDT (21:02 UTC)
Expired
Jun 7, 2019, 3:45 PM MDT
In force
43 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

County Morgan County, CO

The radar

The Denver radar (KFTG), 82 km from the middle of the area, began a volume at 21:03 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 (KDEN), launched 12:00Z, 9.0 hours before the alert went out and 66 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 12:00Z on 2019-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 23 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 12:00Z on 2019-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.1939Sfc1 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
23 J/kg
Mixed-layer CIN
-286 J/kg
Mixed-layer LCL
2470 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jun 7, 11:47 AM MDT, 3 hours 15 minutes earlier.

Area forecast discussion, Jun 7, 11:47 AM MDT, 3 hours 15 minutes before
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Hazardous weather outlook, Jun 7, 11:05 AM MDT, 3 hours 57 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1105 AM MDT Fri Jun 7 2019

COZ030>051-081715-
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 Fri Jun 7 2019

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

.DAY ONE...Today and Tonight

Scattered thunderstorms will develop in and near the mountains
during the early afternoon, then move across the plains during the
afternoon and evening. A few of the thunderstorms are expected to
become severe. The main threats are hail up to golf ball size and
wind gusts to 60 mph. This will be most likely east of a line from
Fort Morgan to Colorado Springs between 2 pm and 8 pm. There is
also a small threat of tornadoes in areas east and south of Limon
after 5 pm. Some areas may also receive an inch of rain in less
than an hour, again mainly over the eastern plains.

Weaker storms will end over and near the mountains by mid evening,
while they may linger near the eastern border until around
midnight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A cold front will move across the area Saturday afternoon, which
will bring a slight chance of thunderstorms to the plains. Showers
and a few thunderstorms will become more widespread across the
plains Saturday night as a weather disturbance affects the area.

Sunday through Tuesday will see below normal temperatures with
only a slight chance of afternoon and evening thunderstorms mainly
across the higher terrain.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight.

Gimmestad/Cooper

In the hours before

Special weather statement, Jun 7, 2:43 PM MDT, 19 minutes before
Special Weather Statement
National Weather Service Denver CO
243 PM MDT Fri Jun 7 2019

COZ043>045-072130-
Central and South Weld County CO-Morgan County CO-
Central and East Adams and Arapahoe Counties CO-
243 PM MDT Fri Jun 7 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL WELD...EASTERN
ARAPAHOE...SOUTHWESTERN MORGAN AND EASTERN ADAMS COUNTIES UNTIL 330
PM MDT...

At 242 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Leader, or 32 miles southwest of Fort Morgan, moving
northeast at 25 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Bennett, Wiggins, Hoyt, Shamrock, Leader, Byers, Adena, Twelve-Mile
Corner, Strasburg and Adena School.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4000 10359 4000 10370 3991 10370 3956 10416
      3975 10451 3978 10451 4019 10428 4033 10401
TIME...MOT...LOC 2042Z 232DEG 25KT 3991 10420

ENTREKIN

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 2:43 PM MDTSpecial Weather StatementBOUAdams47 min
Jun 7, 3:25 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld35 min
Jun 7, 4:00 PM MDTSevere Thunderstorm WarningBOULogan, Weld32 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2019Every severe thunderstorm warning in 2019

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.