Alert archive / Wyoming / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 147, NWS Cheyenne, WY

July 1, 2019Goshen County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 1, 2019, 5:53 PM MDT for Goshen County, Niobrara County, Wyoming. It was in force for 37 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: Jul 1, 2019, 5:53 PM MDT (23:53 UTC)
Expired: Jul 1, 2019, 6:30 PM MDT
In force: 37 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 2.0 in
Wind: 60.0 mph

Counties Goshen County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 161 km from the middle of the area, began a volume at 23:55 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 12:00Z, 11.9 hours before the alert went out and 316 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1756 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 24 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 Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 5:00 PM MDT, 53 minutes earlier.

Area forecast discussion, Jul 1, 5:00 PM MDT, 53 minutes before

Area Forecast Discussion
National Weather Service Cheyenne WY
500 PM MDT Mon Jul 1 2019

.SHORT TERM...(This evening through Tuesday night)
Issued at 232 PM MDT Mon Jul 1 2019

Convection popping over se Wy currently but not really organizing
much as shear is pretty low and only modest instabilities. Could
see a few stronger storms at times into this evening, likely
brief, with strong wind gusts the main threat. HRRR pretty much
keep activity over se Wy with little over the Panhandle. Tuesday
pretty much more of the same as the CWA remains under a generally
WSW upper flow with weak impulses riding across, with sctd showers
and tstms once again in the aftn and evening, a few potentially
strong.  Activity waning in the evening.

.LONG TERM...(Wednesday through Monday)
Issued at 232 PM MDT Mon Jul 1 2019

Fairly stagnant weather pattern over the region through the period
with upper troughing over the Pacific northwest and upper ridging
over the southern plains keeping a generally swly upper flow over
the area. Weak impulses will pass by from time to time keeping
sctd mainly aftn and evening showers/tstms through the period.
Temperatures remaining around seasonal averages.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 456 PM MDT Mon Jul 1 2019

Thunderstorms early this evening impacting airfields along and
south of a line from Wheatland to Torrington to Scottsbluff. Looks
like storms die off after 03Z or so. Could see low stratus
returning to KCDR and KAIA...given forecast wind directions
though...not quite confident enough to add. Will continue
monitoring for the 06Z TAFs.

&&

.FIRE WEATHER...
Issued at 232 PM MDT Mon Jul 1 2019

Concerns expected to stay low with little change expected in the
weather over the area this week. Temperatures will be seasonal
with scattered showers and thunderstorms pretty much every day,
mostly in the afternoons and evenings.

&&

.HYDROLOGY...
Issued at 219 AM MDT Mon Jul 1 2019

Additional rainfall and snowmelt over the next several days could
bring levels back to action stage, but the heaviest rain looks to
stay to the east of the mountain ranges.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&

SHORT TERM...RE
LONG TERM...RE
AVIATION...GCC
FIRE WEATHER...RE
HYDROLOGY...RUBIN

Hazardous weather outlook, Jul 1, 10:27 AM MDT, 7 hours 26 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
1027 AM MDT Mon Jul 1 2019

NEZ002-003-019>021-054-055-095-096-WYZ101>119-021000-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-North Laramie Range-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
1027 AM MDT Mon Jul 1 2019

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Isolated to scattered afternoon and evening thunderstorms are
expected. A few of the storms may become strong to marginally severe
over southeast Wyoming along and east of Interstate 25, and over the
southern Nebraska Panhandle. Strong wind gusts appear to be the main
threat though some hail is possible as well.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Scattered afternoon and evening thunderstorms will be possible
nearly every day through the weekend.

.Spotter information statement...

Spotter activation is not expected.

In the hours before

Special weather statement, Jul 1, 5:12 PM MDT, 41 minutes before

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Local storm report, Jul 1, 5:20 PM MDT, 33 minutes before

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Special weather statement, Jul 1, 5:35 PM MDT, 18 minutes before

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Local storm report, Jul 1, 5:36 PM MDT, 17 minutes before

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Special weather statement, Jul 1, 5:44 PM MDT, 9 minutes before

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Local storm report, Jul 1, 5:52 PM MDT, 1 minute before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 6:22 PM MDT	Severe Thunderstorm Warning	CYS	Platte	38 min
Jun 30, 6:23 PM MDT	Special Weather Statement	CYS	Niobrara	52 min
Jun 30, 6:33 PM MDT	Special Weather Statement	CYS	Goshen	42 min
Jun 30, 6:35 PM MDT	Special Weather Statement	CYS	Platte	40 min
Jun 30, 6:36 PM MDT	Special Weather Statement	CYS	Laramie	39 min
Jun 30, 6:43 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	32 min
Jun 30, 6:48 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie, Platte	42 min
Jun 30, 6:53 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	52 min
Jun 30, 7:10 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	35 min
Jun 30, 7:13 PM MDT	Special Weather Statement	CYS	Laramie	47 min
Jun 30, 7:22 PM MDT	Special Weather Statement	CYS	Goshen	38 min
Jun 30, 7:26 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Goshen, Niobrara, Platte	34 min
Jun 30, 7:46 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	29 min
Jun 30, 8:07 PM MDT	Special Weather Statement	CYS	Niobrara	53 min
Jul 1, 2:01 PM MDT	Special Weather Statement	CYS		44 min
Jul 1, 2:32 PM MDT	Special Weather Statement	CYS	Laramie	43 min
Jul 1, 2:37 PM MDT	Special Weather Statement	CYS	Converse	53 min
Jul 1, 2:52 PM MDT	Severe Thunderstorm Warning	CYS	Converse	38 min
Jul 1, 3:13 PM MDT	Special Weather Statement	CYS	Laramie	32 min
Jul 1, 3:18 PM MDT	Severe Thunderstorm Warning	CYS	Converse	42 min
Jul 1, 3:22 PM MDT	Special Weather Statement	CYS	Albany	38 min
Jul 1, 3:40 PM MDT	Severe Thunderstorm Warning	CYS	Converse	50 min
Jul 1, 3:44 PM MDT	Special Weather Statement	CYS	Laramie	31 min
Jul 1, 3:49 PM MDT	Special Weather Statement	CYS	Laramie	26 min
Jul 1, 4:09 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	36 min
Jul 1, 4:13 PM MDT	Special Weather Statement	CYS	Laramie	47 min
Jul 1, 4:14 PM MDT	Special Weather Statement	CYS	Laramie	46 min
Jul 1, 4:30 PM MDT	Special Weather Statement	CYS	Platte	45 min
Jul 1, 4:44 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara	46 min
Jul 1, 5:12 PM MDT	Special Weather Statement	CYS	Platte	33 min
Jul 1, 5:15 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	45 min
Jul 1, 5:35 PM MDT	Special Weather Statement	CYS	Laramie	40 min
Jul 1, 5:40 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	35 min
Jul 1, 5:44 PM MDT	Special Weather Statement	CYS	Platte	46 min
Jun 30, 8:09 PM MDT	Special Weather Statement	CYS	Banner	51 min
Jun 30, 8:14 PM MDT	Special Weather Statement	CYS	Scotts Bluff	46 min
Jun 30, 8:23 PM MDT	Special Weather Statement	CYS	Cheyenne	52 min
Jun 30, 8:27 PM MDT	Special Weather Statement	CYS	Kimball	48 min
Jun 30, 9:13 PM MDT	Special Weather Statement	CYS	Banner, Cheyenne, Kimball	47 min
Jun 30, 9:39 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	36 min
Jun 30, 10:06 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Box Butte, Morrill, Scotts Bluff, Sioux	54 min
Jun 30, 11:00 PM MDT	Special Weather Statement	CYS	Box Butte	45 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2019 Every 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.