Alert archive / Colorado / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 370, NWS Goodland, KS

August 7, 2018Yuma County, Colorado

NWS Goodland, KS issued this severe thunderstorm warning at Aug 7, 2018, 7:47 PM MDT for Yuma 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: Aug 7, 2018, 7:47 PM MDT (01:47 UTC)
Expired: Aug 7, 2018, 8:30 PM MDT
In force: 43 min
Issued by: NWS Goodland, KS
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Yuma County, CO

The radar

The Goodland radar (KGLD), 94 km from the middle of the area, began a volume at 01:48 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 00:00Z, 1.8 hours before the alert went out and 70 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1316 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1934 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: -27 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -3.3

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 Goodland, KS wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 7, 7:08 PM MDT, 39 minutes earlier.

Area forecast discussion, Aug 7, 7:08 PM MDT, 39 minutes before

Area Forecast Discussion
National Weather Service Goodland KS
708 PM MDT Tue Aug 7 2018

.SHORT TERM...(This evening through Wednesday)
Issued at 319 PM MDT Tue Aug 7 2018

Pops have been increased for the overnight period, as a shortwave
is expected to pass over our eastern CWA from Yuma County,
Colorado to potentially Wichita County, Kansas. Disturbance may
be enough lift to aid in thunderstorm development. Convection is
expected to develop over eastern Colorado and die off over the
plains. Biggest area of favored conditions will be the Palmer
Dive and to the east of it.

West Northwest wind flow aloft will aid in bringing in dryer
area, especially in the mid and upper levels. Model soundings are
showing favorable subsidence tomorrow. Pwat values are still
sitting ~1" in the low levels.

There is currently no well-defined synoptic support for
convection. But short term models like the HRRR and HREF are
pointing to late night convection from 06 to 12Z . MLCAPE values
are ~1000-1500 with about 35-40 knots 0-6 km shear. Expecting
isolated storms with marginally severe hail and winds.

Tonight, lows will sit in the upper 50s to lower 60s across the
Tri-State area. However, depending on convection, this may drop
5 to 10 degrees lower.

Lastly, tomorrow's highs will be in the mid to upper 80s, with
another round of slight chances for convection in the late
afternoon. An isolated severe thunderstorm or two cannot be ruled
out.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 222 PM MDT Tue Aug 7 2018

A shortwave embedded in upper level ridge flow expected over the
northern Plains by Thursday morning. This shortwave moves southeast
over eastern Kansas by Friday night. During the southeastward
progression of this shortwave, thunderstorm chances will exist for
parts of the Tri-State region during the afternoon and overnight
hours. The shortwave will extend into the southern Plains due to
upper level lows settled over Oklahoma and Texas. This trough
becomes split Sunday with the main trough over the Midwest and a
cutoff low remaining over the southern Plains. By Tuesday morning,
the cutoff low over Texas migrates northward towards strong flow
aloft creating a shortwave trough over Kansas. The migration of the
cutoff low over Kansas could potentially bring precipitation to the
Tri-State region Tuesday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 702 PM MDT Tue Aug 7 2018

Thunderstorms will be possible at the GLD terminal between 02-06Z
this evening. Otherwise, VFR conditions will prevail. Except for
gusty/erratic winds invof any thunderstorms, light/variable
winds will prevail.

&&

.GLD WATCHES/WARNINGS/ADVISORIES...
KS...NONE.
CO...NONE.
NE...NONE.
&&

SHORT TERM...EV
LONG TERM...NEWMAN
AVIATION...VINCENT

Hazardous weather outlook, Aug 7, 6:33 PM MDT, 1 hour 14 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Goodland KS
633 PM MDT Tue Aug 7 2018

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-090045-
Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins-
Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-
Greeley-Wichita-Dundy-Hitchcock-Red Willow-
633 PM MDT Tue Aug 7 2018 /733 PM CDT Tue Aug 7 2018/

This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.

.DAY ONE...THROUGH TONIGHT...

Isolated severe thunderstorms capable of producing large hail and
damaging winds will be possible in eastern Colorado and extreme
western Kansas between 6 PM and 11 PM MDT this evening.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY...

An isolated severe thunderstorm cannot be ruled out in eastern
Colorado and extreme southwestern Kansas late Wednesday afternoon and
evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required.

Vincent

In the hours before

Special weather statement, Aug 7, 6:33 PM MDT, 1 hour 14 minutes before

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Local storm report, Aug 7, 7:14 PM MDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
714 PM MDT TUE AUG 7 2018

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

0632 PM     HAIL             13 N FLAGLER            39.48N 103.02W
08/07/2018  E2.00 INCH       KIT CARSON         CO   PUBLIC

            GOLF BALL TO HEN EGG SIZE HAIL COVERING THE
            GROUND TO A DEPTH OF 6 INCHES.

&&

VINCENT

Local storm report, Aug 7, 7:23 PM MDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
723 PM MDT TUE AUG 7 2018

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

0620 PM     HAIL             18 N FLAGLER            39.55N 103.06W
08/07/2018  E2.00 INCH       KIT CARSON         CO   PUBLIC

&&

VINCENT

Local storm report, Aug 7, 7:36 PM MDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
736 PM MDT TUE AUG 7 2018

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

0732 PM     HAIL             6 SE FLAGLER            39.24N 102.97W
08/07/2018  E1.00 INCH       KIT CARSON         CO   PUBLIC

&&

VINCENT

Special weather statement, Aug 7, 7:37 PM MDT, 10 minutes before

Special Weather Statement
National Weather Service Goodland KS
737 PM MDT TUE AUG 7 2018

COZ090-080200-
Yuma County CO-
737 PM MDT TUE AUG 7 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN YUMA COUNTY UNTIL
800 PM MDT...

At 737 PM MDT, Doppler radar was tracking a strong thunderstorm over
Yuma, moving east at 15 mph.

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

Locations impacted include...
Yuma and Eckley.

LAT...LON 4029 10257 4004 10244 3997 10275 4008 10280
      4017 10280 4018 10279
TIME...MOT...LOC 0137Z 248DEG 15KT 4011 10270

024

Local storm report, Aug 7, 7:41 PM MDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
741 PM MDT TUE AUG 7 2018

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

0739 PM     HAIL             4 ESE YUMA              40.09N 102.65W
08/07/2018  E0.88 INCH       YUMA               CO   PUBLIC

&&

VINCENT

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 8:28 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne	47 min
Aug 7, 9:16 PM MDT	Special Weather Statement	GLD	Cheyenne	14 min
Aug 8, 12:01 AM MDT	Special Weather Statement	GLD	Greeley	29 min
Aug 8, 10:49 AM MDT	Special Weather Statement	GLD	Graham	41 min
Aug 8, 10:54 AM MDT	Severe Thunderstorm Warning	GLD	Graham	36 min
Aug 8, 11:35 AM MDT	Severe Thunderstorm Warning	GLD	Graham	8 min
Aug 8, 1:22 PM MDT	Special Weather Statement	GLD	Gove	23 min
Aug 8, 1:28 PM MDT	Severe Thunderstorm Warning	GLD	Gove	32 min
Aug 8, 1:40 PM MDT	Special Weather Statement	GLD	Wichita	35 min
Aug 8, 1:41 PM MDT	Severe Thunderstorm Warning	GLD	Wichita	19 min
Aug 8, 1:55 PM MDT	Severe Thunderstorm Warning	GLD	Gove, Logan	20 min
Aug 8, 2:16 PM MDT	Special Weather Statement	GLD	Logan	14 min
Aug 8, 2:17 PM MDT	Special Weather Statement	GLD	Wichita	13 min
Aug 8, 2:18 PM MDT	Special Weather Statement	GLD	Thomas	27 min
Aug 8, 2:23 PM MDT	Severe Thunderstorm Warning	GLD	Thomas	15 min
Aug 7, 6:28 PM MDT	Severe Thunderstorm Warning	GLD	Kit Carson	47 min
Aug 7, 6:33 PM MDT	Special Weather Statement	GLD	Yuma	27 min
Aug 7, 7:14 PM MDT	Severe Thunderstorm Warning	GLD	Kit Carson	46 min
Aug 7, 7:37 PM MDT	Special Weather Statement	GLD	Yuma	23 min
Aug 7, 7:49 PM MDT	Severe Thunderstorm Warning	GLD	Cheyenne, Kit Carson	41 min
Aug 8, 12:52 AM MDT	Special Weather Statement	GLD	Yuma	53 min
Aug 8, 3:13 AM MDT	Special Weather Statement	GLD	Yuma	47 min
Aug 8, 3:16 AM MDT	Special Weather Statement	GLD	Kit Carson	44 min
Aug 8, 6:42 AM MDT	Special Weather Statement	GLD	Kit Carson	63 min
Aug 8, 8:05 AM MDT	Special Weather Statement	GLD	Yuma	40 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2018 Every severe thunderstorm warning in 2018

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.