008
FXUS65 KRIW 050449
AFDRIW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
1049 PM MDT FRI JUL 4 2025
KEY MESSAGES
- SHOWERS AND THUNDERSTORMS CONTINUE THROUGH MIDNIGHT TONIGHT
WITH THE REMAINING POSSIBILITY OF A FEW STRONG TO SEVERE
THUNDERSTORMS.
- CHANCES FOR SHOWERS AND THUNDERSTORMS SATURDAY WITH ANOTHER
CHANCE FOR SEVERE STORMS, ESPECIALLY ACROSS NORTHERN AND
EASTERN WY. HAIL AND STRONG WINDS ARE THE MAIN HAZARDS.
- DRIER AND WARMER WEATHER RETURNS SUNDAY, BRINGING INCREASED
CHANCES FOR FIRE WEATHER CONDITIONS.
UPDATE
ISSUED AT 1227 PM MDT FRI JUL 4 2025
THE OVERALL MESSAGE FOR TODAY REMAINS THE SAME: SCATTERED SHOWERS
AND THUNDERSTORMS THIS AFTERNOON AND EVENING, WITH STRONG WINDS
BEING THE MAIN HAZARD. HI-RES MODELS CONTINUE TO SHOW WIDESPREAD
THUNDERSTORMS MOVING ACROSS THE AREA THIS AFTERNOON, GENERALLY
ENDING BETWEEN 6PM AND 1AM. THERE COULD BE AN ADDITIONAL CLUSTER OF
SHOWERS OVER CENTRAL WYOMING THROUGH ABOUT SUNRISE, THOUGH NOT ALL
MODELS HAVE THIS FEATURE. THE MAIN HAZARD WITH ANY STORMS WILL BE
GUSTY OUTFLOWS, THE STRONGEST OF WHICH COULD BE AROUND 60 MPH.
DISCUSSION
ISSUED AT 227 AM MDT FRI JUL 4 2025
ITS THE UNITED STATES' BIRTHDAY TODAY AND TURNS 249, ALSO KNOWN AS
INDEPENDENCE DAY OR THE 4TH OF JULY. THE WEATHER ACROSS THE
COWBOY STATE IS LOOKING QUITE UNSETTLED WITH CHANCES FOR NATURAL
FIREWORKS OCCURRING IN THE FORM OF LIGHTNING AND THUNDER.
TEMPERATURES TODAY WILL BE ON THE COOLER SIDE BUT STILL AROUND
SEASONABLE VALUES. HIGHS RANGE FROM THE LOW TO MID 70S WEST OF
THE DIVIDE AND LOW 80S EAST OF THE DIVIDE.
TWO SHORTWAVES WILL MOVE ACROSS THE REGION TODAY, BOTH ARE EXPECTED
TO INFLUENCE AND AID IN THE DEVELOPMENT OF SHOWERS AND
THUNDERSTORMS. PWATS WILL REMAIN ABOVE NORMAL ACROSS THE AREA
BUT THE MAIN CONCERN AS A RESULT OF THIS WILL BE BRIEF HEAVY
DOWNPOURS. MOISTURE HAS HAD ISSUES MIXING DOWN TO THE SURFACE
WHICH HAS LIMITED ANY FLOODING CONCERNS. SO WHILE FLASH FLOODING
IS NOT LIKELY IT CANNOT BE ENTIRELY RULED OUT. CAMS CONTINUE TO
SHOW A COUPLE ROUNDS OF SHOWERS AND THUNDERSTORMS TODAY. THE
FIRST MOVES INTO WESTERN WY BY THE MID MORNING THEN GRADUALLY
SPREADS INTO CENTRAL AND NORTHERN WY. THE NEXT ROUND FOLLOWS
SHORTLY BEHIND, DEVELOPING BY THE EARLY AFTERNOON WITH COVERAGE
BEING MORE WIDESPREAD. THERE ARE SOME SIGNS OF A THIRD PUSH
DEVELOPING IN THE LATE AFTERNOON, LINGERING INTO THE EVENING.
ANOTHER CONCERN TODAY WILL BE THE CHANCE FOR A FEW ISOLATED
STRONG TO EVEN SEVERE STORMS DEVELOPING. INSTABILITY IS FAIRLY
LIMITED BUT A BRIEF PERIOD OF CLEARING SHOULD ALLOW FOR CAPE TO
INCREASE, RANGING FROM 700-1200 J/KG. LOW TO MID LEVEL LAPSE
RATES WILL BE FAIRLY STEEP AND FAVORABLE FOR SOME OF THESE
STORMS TO BECOME SEVERE. OTHER COMPONENTS SUCH AS BULK SHEAR
WILL BE PRESENT WITH VALUES AROUND 40 KNOTS OVER PARTS OF THE
AREA. THE MAIN HAZARDS AS A RESULT OF THESE COMPONENTS WILL BE
STRONG GUSTY WINDS MIXING DOWN TO THE SURFACE AS THESE STORMS
MOVE ACROSS THE STATE. CAMS ARE SHOWING POTENTIALLY WIDESPREAD
OUTFLOWS OF 40 TO 50 MPH WITH ISOLATED GUSTS POSSIBLY NEARING 60
MPH. SMALL HAIL WILL BE POSSIBLE IF STORMS ARE ABLE TO ORGANIZE
AND ENOUGH INSTABILITY DEVELOPS. THE BEST CHANCES FOR HAIL
LOOKS TO BE ACROSS WESTERN WY WHERE SOME MODELS SHOW CAPE VALUES
RANGING FROM 1000 TO 1500 J/KG. THE POTENTIAL FOR STRONG TO
SEVERE STORMS IS ALSO REPRESENTED BY THE SPCS OUTLOOKS WHICH HAS
PLACED MUCH OF WY IN A MARGINAL RISK FOR STRONG WIND GUSTS AND
SMALL HAIL. OVERALL, TODAY IS NOT LOOKING TO BE A WASHOUT BUT AS
MENTIONED EARLIER IT WILL BE UNSETTLED WITH CHANCES FOR SHOWERS
AND SOME STRONG TO SEVERE THUNDERSTORM THROUGHOUT THE DAY.
THE WEEKEND IS LOOKING LESS ACTIVE, BUT WILL STILL HAVE SOME CHANCES
FOR SHOWERS AND THUNDERSTORMS. COVERAGE OF THESE SHOWERS AND
THUNDERSTORMS WILL BE LESS WIDESPREAD SATURDAY, WITH THE BEST
CHANCES BEING ACROSS CENTRAL AND NORTHERN WY. THERE IS THE POTENTIAL
FOR SOME SEVERE STORMS TO DEVELOP SATURDAY AS A RESULT OF THE SECOND
SHORTWAVE MOVING ACROSS MONTANA. THE SPCS DAY 2 OUTLOOK HIGHLIGHTS
THIS POTENTIAL WITH PARTS OF THE STATE BEING PLACED IN A SLIGHT
RISK. THE AREAS OF CONCERN LOOK TO BE ACROSS NORTHERN AND EASTERN
WY, SPECIFICALLY THE BIGHORN BASIN ALONG WITH JOHNSON AND NATRONA
COUNTIES. THESE AREAS WILL SEE INSTABILITY DEVELOP DURING THE DAY
AND WILL BE COMBINED WITH FAVORABLE DYNAMICS FROM THE NEARBY
SHORTWAVE. THE MAIN HAZARDS WILL BE LARGE HAIL AND STRONG GUSTY
WINDS ALONG WITH AN ISOLATED TORNADO OR TWO.
THE UNSETTLED WEATHER PATTERN FINALLY LOOKS TO QUIET DOWN FOR
SUNDAY. TEMPERATURES WILL BE SEASONABLE BUT BEGIN TO GRADUALLY WARM
AS RIDGING LOOKS TO START BUILDING IN OVER THE WESTERN CONUS. A
PERIOD OF HOT AND DRY CONDITIONS IS BEGINNING TO LOOK MORE LIKELY
FOR THE UPCOMING WEEK. A BIG FACTOR WILL BE THE STRENGTH OF THE
RIDGING AND HOW LONG IT CAN PREVAIL OVER THE REGION. THERE IS STILL
TIME FOR THINGS TO CHANGE BUT AS OF RIGHT NOW THE JULY HEAT AND
DRYNESS LOOKS TO BE RIGHT AROUND THE CORNER. THIS MAY LEAD TO SOME
ELEVATED FIRE WEATHER CONDITIONS SO IT WILL NEED TO BE MONITORED AS
WE HEAD INTO THE START OF NEXT WEEK.
AVIATION /06Z TAFS THROUGH 06Z SUNDAY/
ISSUED AT 1046 PM MDT FRI JUL 4 2025
SHOWERS AND EMBEDDED THUNDERSTORMS WILL CONTINUE MOVING EAST
THROUGH MIDNIGHT, POSSIBLY BRING WIND GUSTS TO 40 KNOTS IN
VICINITY OF KWRL AND KCPR AS THEY PASS. OTHERWISE, VFR FLIGHT
CONDITIONS ARE ANTICIPATED WITH CLEARING OVERNIGHT SKIES AND
LIGHT WINDS. SOUTH TO SOUTHWESTERLY WINDS INCREASE AT ALL
TERMINALS BETWEEN 17Z-19Z WITH GUSTS GENERALLY BETWEEN 20-25
KTS. SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE (30
PERCENT CHANCE) SATURDAY BETWEEN 20Z-01Z AT MOST TERMINALS;
HOWEVER, CONFIDENCE IN DIRECT IMPACTS IS AROUND 30% SO OPTED FOR
A PROB30 GROUP AT THIS TIME. CONFIDENCE (LESS THAN 20%) IS
LOWER AT KJAC, KLND, AND KRKS SO LEFT ANY MENTION OUT AT THIS
TIME. ANY DIRECT IMPACT OR NEARBY THUNDERSTORM COULD PRODUCE
GUSTY WINDS OVER 35KTS. OUTSIDE OF THUNDERSTORM GUSTS, DAYTIME
GUSTY WINDS ARE EXPECTED TO DIMINISH AROUND SUNSET SATURDAY
EVENING.
RIW WATCHES/WARNINGS/ADVISORIES
NONE.
UPDATE...WITTMANN
DISCUSSION...DZIEWALTOWSKI
AVIATION...GERHARDT/HATTINGS
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