Special Weather Statement, NWS Riverton, WY

Area Forecast Discussion
National Weather Service Riverton WY
153 PM MDT FRI JUL 29 2016

.SHORT TERM...Tonight Through Monday

Convection looking better attm compared to yesterday with
approaching shortwave and good day of heating with warmer temps and
dew points still up. Will have to watch these into the evening hours.
Monsoonal moisture is lurking as far north as ecntrl nv and wcntrl
ut. As the upper high gets slowly suppressed swd...the models are
trying to bring the first round of mid level moisture into far
wrn/swrn Wyoming during the day Saturday. Not the most favorable
flow pattern through Saturday but all the guidance is trying to
bring it in around the wrn/nwrn edge of the high. Little better
chance Saturday night into Sunday with developing wsw flow in the
mid levels and trough helping as it moving into srn Canada and the
far nwrn part of the PacNW. Just another concern for the fire conds
with dry lightning/gusty wind potential near any isold storms.
Otherwise, very warm to hot with some breezes around. Limited mainly
mid level moisture spread through the entire area Saturday night
into Sunday giving most everyone at least a slight chance of high
based storms. Moisture likely gets suppressed Monday so just hot and
dry with local breezes.

.LONG TERM...Monday Night Through Friday

Weak convection possible Monday evening, but overall it will be
quiet Monday night and Tuesday morning. Medium-range models in
good agreement with upper low tracking along the US/Canada border
near the Idaho Panhandle on Tuesday. Southwest flow aloft ahead
of this feature will boost temperatures well into the 90s across
many of the lower elevations and winds will also increase. Looks
like this could be another critical fire weather day, and
highlights will depend upon fuels status and where the wind blows
most. Tough to discount the possibility of at least isolated
convection with the best chance over the western mountains and
potentially southwest Wyoming. As the low tracks east along the
northern Montana border Tuesday night, cooler air will push south
into Wyoming and affect mainly areas east of the Continental
Divide. Temperatures will be several degrees cooler Wednesday and
more seasonal for this time of year. Drier and more stable
westerly flow will limit any convection to areas near the Utah and
Colorado borders. Overall trend is for drier zonal flow Thursday
with gradual backing of the upper flow to southwest by Friday.
Temperatures will continue around seasonal normals with convection
largely limited to the far southern tier of the forecast area.
Winds will increase on Friday across mainly southwest Wyoming.
Drier flow will lead to low dew points and falling relative
humidities. Many lower elevation locations will see poor overnight
humidity recovery.

&&

.AVIATION.../00Z ISSUANCE/

Expect VFR conditions to prevail through 00Z/Sunday. Convection
this afternoon has developed as expected over the Absaroka and
Bighorn ranges tracking over points downstream. Will go with VCSH
at KCOD and KCPR but axis over northern Natrona may not shift much
to the south as convections tracks southeast of the southern end
of the Bighorn Range. So, confidence is less at KCPR. Convection
will diminish with the setting sun and benign conditions will be
the rule overnight. West-northwest surface wind 12-22kts at KRKS
will continue until around 02Z/Sat. Similar speeds expected to
develop by 21Z/Fri at KBPI and KPNA. Weak boundary will allow for
northeast surface wind at KRIW and KCPR through much of the
evening. Wind speeds at southwest terminals will increase again
Saturday afternoon, likely between 18Z at KRKS and by 20Z at KBPI,
KPNA, and KJAC. Any convection Saturday should be confined to the
southwest mountains and nearby basins. Therefore, have included
VCSH at KBPI and KPNA.

&&

.FIRE WEATHER...

...Fire Weather Watch for Saturday afternoon and evening for fire
zones 283...288...289...414...415 and 416...

Isolated thunderstorms will prevail through the evening with the
potential for gusty wind near any storms. A surge of higher level
subtropical moisture will move into the southwest during the day
Saturday with a little bit spilling over the divide. Isolated to
widely scattered gusty thunderstorms will occur near any of these.
Fire conditions will worsen in the western mountains and as far east
as the Wind River Basin and nearby Green and Rattlesnake Ranges due
to breezes, hot temps, low rh's, 5-6 haines index and isolated to
widely scattered dry lightning.

&&

.RIW Watches/Warnings/Advisories...
Fire Weather Watch from Saturday afternoon through Saturday
evening for WYZ283-288-289-414>416.

&&

SHORT TERM...PS
LONG TERM...CNJ
AVIATION...CNJ
FIRE WEATHER...PS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
1213 PM MDT FRI JUL 29 2016

WYZ001>020-022>030-301300-
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS-
NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN-
SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS-
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY-
TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE-
WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST-
UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-
NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY-
SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS-
UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY-
ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY-
1213 PM MDT FRI JUL 29 2016

...FIRE WEATHER WATCH SATURDAY AFTERNOON AND EVENING FOR THE
WESTERN MOUNTAINS...WIND RIVER BASIN...GREEN AND RATTLESNAKE
RANGES...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

ISOLATED AFTERNOON AND EVENING THUNDERSTORMS...MAINLY EAST OF THE
DIVIDE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SATURDAY...SHOWERS AND THUNDERSTORMS POSSIBLE ACROSS AREAS WEST OF
THE CONTINENTAL DIVIDE. ELEVATED FIRE DANGER POSSIBLE FOR MANY
AREAS...ESPECIALLY WESTERN MOUNTAINS AND CENTRAL PARTS WHERE FIRE
WEATHER WATCHES ARE IN EFFECT.

SUNDAY AND MONDAY...ISOLATED TO SCATTERED THUNDERSTORMS. ELEVATED
FIRE DANGER MONDAY.

TUESDAY...ISOLATED AFTERNOON AND EVENING THUNDERSTORMS. CRITICAL
FIRE CONDITIONS POSSIBLE CENTRAL AND WEST.

WEDNESDAY...ISOLATED AFTERNOON AND EVENING THUNDERSTORMS IN
SOUTHERN WYOMING.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT HAIL SIZES AND ANY WIND GUSTS
GREATER THAN 45 MPH. THANK YOU.

TEAM RIVERTON

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