Alert archive / Nebraska / Special Weather Statements in 2018

Special Weather Statement, NWS Cheyenne, WY

August 18, 2018Cheyenne County, Nebraska

NWS Cheyenne, WY issued this special weather statement at Aug 18, 2018, 2:15 PM MDT for Cheyenne County, Nebraska. It was in force for 45 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: Aug 18, 2018, 2:15 PM MDT (20:15 UTC)
Expired: Aug 18, 2018, 3:00 PM MDT
In force: 45 min
Issued by: NWS Cheyenne, WY

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 177 km from the middle of the area, began a volume at 20:17 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 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 Cheyenne, WY wrote its last area forecast discussion before this special weather statement went out at Aug 17, 5:33 PM MDT, 20 hours 42 minutes earlier.

Area forecast discussion, Aug 17, 5:33 PM MDT, 20 hours 42 minutes before

Area Forecast Discussion
National Weather Service Cheyenne WY
533 PM MDT Fri Aug 17 2018

.SHORT TERM...(This evening through Sunday Night)
Issued at 107 PM MDT Fri Aug 17 2018

Tonight...Expecting isolated to widely scattered thunderstorms
through early evening mainly along and east of I-25. With CAPES from
1000 to 2000 J/kg and some weak shear, we may see a few strong to
severe thunderstorms develop before storms dissipate by late evening.

Saturday...Rather potent shortwave trough aloft moves over eastern
Wyoming in the afternoon, and with adequate low and mid level
moisture, we expect scattered showers and thunderstorms to form in
the morning and continue in the afternoon. A few strong to severe
storms possible with expected shear and instability. Cooler
temperatures with more cloud cover and precipitation.

Saturday night...Even in the wake of the cold front, we expect
scattered showers and a few thunderstorms as the atmosphere nears
saturation under cyclonic flow aloft.

Sunday...Autumnal like day in the wake of the cold front with
scattered showers and a few thunderstorms in the moist cyclonic flow
aloft. Maximum temperatures only in the mid 60s to near 70 degrees.
Breezy as well based on low and mid level gradients.

.LONG TERM...(Monday through Friday)
Issued at 107 PM MDT Fri Aug 17 2018

Monday...Slow warming trend under northwest flow aloft and the day
looks dry with limited low and mid level moisture.

Tuesday...Flow aloft remains northwest. With adequate moisture,
expect isolated late day thunderstorms over and near the southern
mountains near the Colorado state line.

Wednesday...Although ridging aloft continues, it looks like enough
low and mid level moisture for at least isolated late day
thunderstorms over and near the mountains near the Colorado state
line.

Thursday...Drier westerly flow aloft develops, producing a day with
near zero chance of thunderstorms. Warmer temperatures expected with
less cloud cover and precipitation coverage.

Friday...Heights slowly decrease and flow turns west southwest as a
fast moving shortwave trough aloft moves eastward across Montana.
Mostly dry day except for a few thunderstorms over the mountains.

&&

.AVIATION...(For the 00Z TAFS through Saturday afternoon)
Issued at 530 PM MDT Fri Aug 17 2018

Widely scattered showers and thunderstorms continue to develop near
the Interstate 25 corridor and are slowly moving east late this
afternoon. Kept VCTS for most terminals with the exception of KRWL
through late this evening. Thunderstorms may not impact the Nebraska
terminals until 02z to 04z or so due to relatively slow storm
motion. Gusty winds, heavy rainfall, and frequent lightning will be
the primary concerns before the activity weakens or exits the region
by 06z.

&&

.FIRE WEATHER...
Issued at 107 PM MDT Fri Aug 17 2018

Minimal concerns as winds and humidities remain below critical
thresholds.

&&

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

SHORT TERM...RUBIN
LONG TERM...RUBIN
AVIATION...TJT
FIRE WEATHER...RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 5:28 PM MDT	Special Weather Statement	CYS	Albany	47 min
Aug 17, 6:56 PM MDT	Special Weather Statement	CYS	Banner	49 min
Aug 17, 6:57 PM MDT	Special Weather Statement	CYS	Scotts Bluff	48 min
Aug 17, 7:46 PM MDT	Special Weather Statement	CYS	Banner	44 min
Aug 18, 3:12 PM MDT	Special Weather Statement	CYS	Cheyenne	48 min

Nearby

Special Weather Statements in Nebraska, 2018 Every special weather statement 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; radar from the NEXRAD Level II archive.