A thunderstorm produced strong winds in central Laramie County.
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The episode as NWS CYS wrote it up.
A thunderstorm produced strong winds in central Laramie County.
The local office's own words before the first event, 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 the first event at Jul 8, 1:18 PM MST, 1 hour 37 minutes earlier.
Area Forecast Discussion
National Weather Service Cheyenne WY
218 PM MDT FRI JUL 8 2016
.SHORT TERM...(This evening through Sunday night)
Issued at 330 PM MDT Fri Jul 8 2016
Forecast concerns in the short term deal with severe thunderstorms
and fire weather concerns.
Currently...Near stationary boundary being analyzed on surface
analysis from just north of Casper to Scottsbluff to Bridgeport.
Dewpoints out in the Panhandle in the low 60s east of the front.
To the west of the front we are seeing winds gusting in the 20s to
mid 30s out across Carbon County. Dodge Creek RAWS site gusting to
25MPH and this site is pretty close to the western portion of 301.
Still have several hours of wind potential at least through sunset
today and decided to keep the Red Flag Warning going.
As for severe potential...latest SPC mesoanalyst CAPE values are
roughly 3000 J/KG over eastern Cheyenne County...decreasing to
around 1000 J/KG here in Laramie County at 2PM. We are starting to
see convection developing across southern Albany County and even
just south of Cheyenne. Will continue severe thunderstorm wording
in the forecast for this afternoon and early evening.
More widespread winds Saturday as the surface trough moves east
into the Panhandle. Could mix up again to 500mbs and GFS
forecasting 30-35kts at that level. Going to be warmer and drier
over todays conditions. Went ahead and issued a Fire Weather Watch
for Saturday for FWZ 301.
Story continues for Sunday. More widespread and stronger winds.
GFS 700mb winds 30-35kts widespread. Surface trough will be east
of the Panhandle, so we should be seeing widespread wind gusts in
excess of 30MPH for just about everyone. Critical fire weather
conditions pretty much everywhere, even out in the Panhandle
Sunday afternoon.
.LONG TERM...(Monday through Friday)
Issued at 330 PM MDT Fri Jul 8 2016
An abnormally strong upper-level shortwave and associated cold front
will be the main weather story early in the period. Significant mid-
level height falls will occur on Monday, with the GFS and ECMWF both
showing H5 heights under 570 dm by 00z Tuesday. Such values are very
low for this time of year, with NAEFS climo tables showing mean geo-
potential heights more than 3 standard deviations below normal. High
temperatures will be tricky for Monday, and heavily dependent on the
exact track of the surface cold front. 700 millibar temperatures are
still very different in the models at 18z Mon, ranging from +2 deg C
on the NAM to +6 deg C on the ECMWF over western areas. Continued to
trend lower than MOS guidance given the pattern. Monday will be very
windy as well, with winds aloft above the 99th percentile given this
time of year. H85 CAG-CPR gradients of 60 to 70 meters are extremely
impressive, more characteristic of early January than July. CAA will
yield very strong mixing with 35-50 knot flow over the CWA in the 12
Z to 18Z Monday time frame. Wind highlights may be required for some
of our wind corridors if the NAM/GFS have the right idea. The ECM is
still a bit of an outlier with a northern track of the low. Moisture
will be limited with this fropa, so expect precip chances to be very
minimal on Monday. Believe it or not, mountains to the northwest may
experience light snow from this system. Fortunately, not in our area
the way it looks right now.
The remainder of the forecast period should feature dry, quasi-zonal
flow aloft with a gradual warming trend. Fire weather is expected to
be the primary concern with afternoon RH values frequently in the 10
to 20 percent range and periods of gusty winds. A lack of any strong
weather system and decent moisture will most likely preclude chances
for precipitation through Wednesday. The next shortwave/surface cold
front will arrive later in the week, so the earliest chance for more
widespread showers and thunderstorms looks to be Thursday.
&&
.AVIATION...(For the 18Z TAFS through 18Z Saturday afternoon)
Issued at 1135 AM MDT Fri Jul 8 2016
In general, VFR conditions will prevail through the period. Shower
and thunderstorm activity will increase over southeast Wyoming and
the western Nebraska Panhandle after 21z, and continue through 03z
this evening. This will primarily impact the I-80 corridor between
KLAR and KSNY, possibly as far north as KBFF. Storms may be strong
to severe, with heavy rain, hail, and strong winds. A brief period
of MVFR conditions may accompany the strongest storms.
&&
.FIRE WEATHER...
Issued at 330 PM MDT Fri Jul 8 2016
Afternoon humidities across western Converse County are down in the low
teens this afternoon. Getting wind gusts close to 20MPH at the Dodge Creek
RAWS site that is just south of FWZ 301. WIll let the Red Flag Warning ride
this afternoon as we could still mix down some of those stronger winds from
higher elevations as forecast on model soundings. Not many sensors
in western 301 to go by, so am reluctant to cancel the RFW. Expect more
widespread and stronger winds for Saturday and Sunday as a low pressure
system approaches from the west. Very strong winds expected Sunday night into
Monday that could bring widespread elevated to critical fire weather conditions
to southeast Wyoming and Nebraska Panhandle.
&&
.CYS Watches/Warnings/Advisories...
WY...Red Flag Warning until 8 PM MDT this evening for WYZ301.
Fire Weather Watch from Saturday afternoon through Saturday
evening for WYZ301.
NE...None.
&&
SHORT TERM...GCC
LONG TERM...CLH
AVIATION...CLH
FIRE WEATHER...GCCHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 359 AM MDT FRI JUL 8 2016 WYZ101>119-091000- 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- 359 AM MDT FRI JUL 8 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON ACROSS SOUTHEAST WYOMING. A FEW STORMS COULD BECOME SEVERE NEAR THE COLORADO BORDER AND ALONG THE CHEYENNE RIDGE, WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ISOLATED THUNDERSTORMS WILL RETURN TO PORTIONS OF SOUTHEAST WYOMING ALONG AND EAST OF THE LARAMIE RANGE ON SATURDAY AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON, MAINLY FOR LARAMIE COUNTY. NEZ002-003-019>021-054-055-095-096-091000- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 359 AM MDT FRI JUL 8 2016 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF PANHANDLE NEBRASKA. .DAY ONE...TODAY AND TONIGHT WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON, MAINLY ACROSS THE SOUTHERN NEBRASKA PANHANDLE. A FEW STORMS COULD BECOME SEVERE, WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY ISOLATED THUNDERSTORMS WILL RETURN TO PORTIONS OF THE NEBRASKA PANHANDLE ON SATURDAY AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON, MAINLY FOR AREAS SOUTH OF THE NORTH PLATTE RIVER VALLEY.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 246 PM MDT FRI JUL 8 2016 WYZ106-115>117-082130- SOUTH LARAMIE RANGE WY-SOUTH LARAMIE RANGE FOOTHILLS WY- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY- LARAMIE VALLEY WY- 246 PM MDT FRI JUL 8 2016 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN ALBANY COUNTY UNTIL 330 PM MDT... AT 246 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER UNIVERSITY OF WYOMING WAR MEMORIAL STADIUM...OR OVER LARAMIE...MOVING EAST AT 25 MPH. WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... LARAMIE...UNIVERSITY OF WYOMING WAR MEMORIAL STADIUM AND BALDY PEAK. THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 305 AND 320. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE. && LAT...LON 4125 10569 4145 10575 4165 10532 4128 10529 TIME...MOT...LOC 2046Z 261DEG 21KT 4134 10555 HAMMER
The Cheyenne radar (KCYS), 1 km away, was scanning. The volume nearest the first event began at 21:57 UTC.
2 thunderstorm wind. Local standard time, as filed.
The wind sensor at the Cheyenne Airport measured a peak gust of 62 mph.
Estimated 60 mph wind gusts were reported 10 miles east of Cheyenne.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2016Every state in 2016This day in weather historyWarnings in Wyoming, July 2016
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 652181, 652182.