908
FXUS65 KRIW 011556
AFDRIW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
956 AM MDT TUE JUL 1 2025
KEY MESSAGES
- WARM TEMPERATURES PREVAIL ACROSS THE STATE WITH ISOLATED
CHANCES FOR MOSTLY VIRGA SHOWERS AND DRY THUNDERSTORMS DURING
THE AFTERNOON AND EVENING. GUSTY 40-60 MPH OUTFLOWS WILL BE
POSSIBLE.
- AN INFLUX OF MOISTURE WILL CREATE INCREASED CHANCES FOR DAILY
AFTERNOON SHOWERS AND THUNDERSTORMS STARTING WEDNESDAY.
- UNSETTLED WEATHER CONTINUES INTO THE SECOND HALF OF THE WEEK
WITH WIDESPREAD CHANCES FOR SHOWERS AND THUNDERSTORMS ON
THURSDAY AND FRIDAY.
DISCUSSION
ISSUED AT 242 AM MDT TUE JUL 1 2025
JUNE HAS CONCLUDED AND TODAY MARKS THE START OF JULY. THE UPCOMING
WEATHER PATTERN FOR THE BEGINNING OF JULY IS LOOKING WARM AND
UNSETTLED ACROSS MUCH OF THE COWBOY STATE. WARM, ABOVE NORMAL
TEMPERATURES ARE FORECAST OVER THE NEXT FEW DAYS. DAILY CHANCES FOR
SHOWERS AND THUNDERSTORMS ARE EXPECTED THROUGH THE REMAINDER OF THE
WEEK. SOUTHWESTERLY FLOW WILL USHER IN WELL ABOVE NORMAL PWAT VALUES
FOR WEDNESDAY THROUGH FRIDAY. CONVECTION CHANCES WILL INCREASE
AROUND THE SAME TIME WITH DAILY COVERAGE BECOMING MORE WIDESPREAD
STARTING WEDNESDAY.
TODAY, THE FIRST DAY OF JULY, AS MENTIONED EARLIER WILL BE WARM WITH
ABOVE NORMAL TEMPERATURES. HIGHS TODAY WILL RANGE FROM THE MID TO
UPPER 80S WEST OF THE DIVIDE AND LOW TO MID 90S EAST OF THE DIVIDE.
AN UPPER LEVEL LOW MOVING INTO THE WESTERN CONUS TODAY WILL BE THE
KEY WEATHER MAKER THROUGH THE WEEK. MULTIPLE SMALL DISTURBANCES WILL
MOVE ACROSS THE AREA OVER THE WEEK BRINGING DAILY CHANCES FOR
SHOWERS AND THUNDERSTORMS. TUESDAY WILL SEE FAIRLY LIMITED
CONVECTION BEING MAINLY ISOLATED TO SCATTERED IN NATURE DURING THE
AFTERNOON AND EVENING. ONE THING TO KEEP IN MIND IS THAT THE
ATMOSPHERE WILL STILL BE RATHER DRY, WHICH WILL LIMIT STORM
DEVELOPMENT AND LIKELY PRODUCE MAINLY VIRGA SHOWERS. THESE SHOWERS
AND THUNDERSTORMS WILL BE CAPABLE OF PRODUCING SOME STRONG OUTFLOW
WINDS DUE TO LARGE DEWPOINT DEPRESSIONS OF 40 TO 60 DEGREES IN SOME
LOCATIONS, ESPECIALLY SOUTHERN WY. SHOWERS AND THUNDERSTORMS WILL
DISSIPATE SHORTLY AFTER SUNSET.
WEDNESDAY WILL SEE MUCH OF THE SAME WITH WARM ABOVE NORMAL
TEMPERATURES AND AFTERNOON SHOWERS AND THUNDERSTORMS. THE ONE
DIFFERENCE WILL BE THE INFLUX OF WELL ABOVE NORMAL MOISTURE. THE
AFOREMENTIONED UPPER LEVEL LOW OVER THE WESTERN CONUS WILL AID IN
FUNNELING MOISTURE INTO THE REGION. MODELS SHOW PWAT VALUES OF 0.60
TO 0.90 INCHES WHICH WOULD BE NEARLY 100 TO 150% ABOVE NORMAL. THIS
MOISTURE WILL AID IN CREATING MORE WIDESPREAD DEVELOPMENT OF SHOWERS
AND THUNDERSTORMS. THE STRENGTH OF ANY STORMS THAT DEVELOP WILL
STILL BE FAIRLY MINIMAL AS CAPE VALUES ONLY LOOK TO BE AROUND 500-
800 J/KG. OTHER FAVORABLE DYNAMICS ARE NOT EXPECTED TO BE IN PLACE
WHICH SHOULD LIMIT ANY STRONG STORM DEVELOPMENT.
THURSDAY WILL SEE THE WARM AND UNSETTLED PATTERN CONTINUE. HOWEVER,
MOISTURE IS EXPECTED TO INCREASE FURTHER WITH PWATS NEARING 1 INCH
TRANSLATING TO ALMOST 200% ABOVE NORMAL VALUES. THIS WILL INCREASE
THE CHANCES FOR PERIODS OF HEAVY DOWNPOURS AS SHOWERS AND
THUNDERSTORMS DEVELOP AND MOVE ACROSS THE STATE DURING THE AFTERNOON
AND EVENING. WHILE STORM MOTION IS NOT EXPECTED TO BE STATIONARY
THERE WILL STILL BE THE POTENTIAL FOR SOME ISOLATED FLASH FLOODING
AS A RESULT OF THIS INCREASED INFLUX OF MOISTURE. THE OTHER CONCERN
THAT DEVELOPS ON THURSDAY WILL BE INCREASED CHANCES FOR STRONG
THUNDERSTORMS. THESE INCREASED CHANCES ARE DUE TO HIGHER CAPE VALUES
ALONG WITH MORE FAVORABLE DYNAMICS AS A RESULT OF A LEESIDE LOW
DEVELOPING OVER THE NORTHERN PLAINS. WHILE STILL A FEW DAYS OUT THE
BEST CHANCES FOR STRONG THUNDERSTORMS WOULD BE ACROSS EASTERN WY
INCLUDING PORTIONS OF NATRONA AND JOHNSON COUNTIES.
LOOKING AHEAD TOWARDS THE 4TH OF JULY, THE UNSETTLED WEATHER
PERSISTS WITH WIDESPREAD CHANCES FOR SHOWERS AND THUNDERSTORMS.
TEMPERATURES WILL COOL SLIGHTLY COMPARED TO EARLIER IN THE WEEK,
RETURNING TO NEAR SEASONABLE VALUES. ABOVE NORMAL PWATS LINGER WHICH
WOULD CREATE ANOTHER DAY WITH CHANCES FOR HEAVY DOWNPOURS AND
ISOLATED FLASH FLOODING. THE BEST CHANCES ARE CURRENTLY LOOKING TO
BE ACROSS CENTRAL AND NORTHERN WY. THESE MAY CREATE SOME
DIFFICULTIES WHEN IT COMES TO INDEPENDENCE DAY CELEBRATIONS. WHILE
THE FORECAST IS NOT SET IN STONE, IT IS STARTING TO LOOK MORE LIKELY
THAT FRIDAY MAY BE QUITE UNSETTLED FOR MUCH OF THE COWBOY STATE.
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
ISSUED AT 500 AM MDT TUE JUL 1 2025
VFR CONDITIONS EXPECTED THROUGHOUT THE PERIOD FOR ALL TAF
SITES. LIGHT WINDS AND MAINLY CLEAR SKIES TO START THE MORNING
WITH INCREASING MID LEVEL CLOUDS THROUGH THE AFTERNOON. WINDS
WILL INCREASE WITH A BREEZE UP TO 18KTS FOR BPI/PNA/RKS/CPR
AFTER 17-20Z WITH DAYTIME HEATING. PROB30 GROUPS FOR STORM
ACTIVITY AND GUSTY WINDS GENERALLY BETWEEN 21-00Z AT ALL BUT
WRL/CPR WITH HIGHLY LOW CONFIDENCE AT THOSE TWO LOCATIONS. AFTER
00Z, EXPECT MID LEVEL CLOUDS TO LINGER INTO THE OVERNIGHT HOURS
AS WINDS DECREASE TO LESS THAN 10KTS AFTER 04Z WITH RADIATIONAL
COOLING AFTER SUNSET. MORE WIDESPREAD STORM ACTIVITY EXPECTED
FOR WEDNESDAY AFTERNOON/EVENING.
PLEASE SEE THE AVIATION WEATHER CENTER AND/OR CWSU ZDV AND ZLC
FOR THE LATEST INFORMATION ON SMOKE, ICING, AND TURBULENCE
FORECASTS.
RIW WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION...DZIEWALTOWSKI
AVIATION...LOWE
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