210
FXUS65 KRIW 250921
AFDRIW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
321 AM MDT WED MAR 25 2026
KEY MESSAGES
- RECORD BREAKING WARMTH, GUSTY WINDS, AND DRY CONDITIONS ARE
EXPECTED TO OCCUR TODAY. THIS WILL LEAD TO WIDESPREAD
CRITICAL FIRE WEATHER CONDITIONS DURING THE AFTERNOON AND
EVENING.
- AN ISOLATED VIRGA SHOWER AND POSSIBLY A THUNDERSTORM, CANNOT
BE RULED OUT THIS EVENING ACROSS SOUTHERN WY.
- A FRONTAL PASSAGE WILL BRING COOLER TEMPERATURES FOR THURSDAY
ALONG WITH PRECIPITATION CHANCES TO SOME HIGHER AND LOWER
ELEVATIONS OF NORTHERN WY.
- DRY AND WARM CONDITIONS RETURN FOR THE END OF THE WEEK INTO
THE UPCOMING WEEKEND.
DISCUSSION
ISSUED AT 306 AM MDT WED MAR 25 2026
ANOTHER ROUND OF HIGH TEMPERATURE RECORDS WERE BROKEN ACROSS THE
COWBOY STATE TUESDAY. IN TOTAL, 7 CLIMATE LOCATIONS SAW NEW OR
TIED RECORD HIGH TEMPERATURES, AS VALUES GOT INTO THE LOW TO
MID 70S EAST OF THE DIVIDE AND MID TO UPPER 60S WEST OF THE
DIVIDE. MORE OF THE SAME IS LIKELY TO OCCUR TODAY, AS
TEMPERATURES ONCE AGAIN CLIMB TO WELL ABOVE NORMAL VALUES.
AS MENTIONED EARLIER, ANOTHER DAY OF RECORD BREAKING
TEMPERATURES IS EXPECTED TO OCCUR TODAY. 700 MB TEMPERATURES
INCREASE AS A RESULT OF THE POTENT HIGH TO THE SOUTH PUSHING
FARTHER NORTH. COMPARED TO YESTERDAY THESE TEMPERATURES HAVE
ADJUSTED SLIGHTLY. THE VALUES ACROSS NORTHWESTERN WY HAVE
COOLED TO VALUES AROUND 2-3 C. THIS IS LIKELY THE RESULT OF THE
HIGH NOT EXTENDING AS FAR TO THE NORTH AS ORIGINALLY THOUGHT.
TEMPERATURES WILL STILL WARM THE FARTHER SOUTH AND EAST YOU GO,
WITH CENTRAL WY SEEING VALUES AROUND 7 C TO 10 C. SOUTHERN WY,
MAINLY SWEETWATER COUNTY STILL LOOKS TO SEE 700 MB TEMPERATURES
AROUND 10 C TO 12 C. THESE VALUES WILL STILL LIKELY TRANSLATE
TO NEAR OR EVEN RECORD BREAKING TEMPERATURES FOR THE LOWER
ELEVATIONS OF SOUTHERN WY AND EAST OF THE DIVIDE. THE CURRENT
FORECAST HAS HIGHS REACHING THE UPPER 70S AND LOW 80S EAST OF
THE DIVIDE. SOUTHERN WY SEES VALUES REACH THE MID TO UPPER 70S,
WHILE WESTERN VALLEYS LOOK TO GET INTO THE LOW 70S.
PROBABILISTIC GUIDANCE HAS CHANGED SLIGHTLY, SHOWING CENTRAL
AND NORTHERN BASINS HAVING A 60-80% OF SEEING HIGHS REACH OR
EXCEED 80F. SOUTHERN WY HAS REMAINED MOSTLY UNCHANGED WITH A
50-80% CHANCE OF SEEING HIGHS EXCEED 75F. DAILY HIGH TEMPERATURE
RECORDS AND EVEN ALL-TIME MARCH HIGH TEMPERATURE RECORDS MAY
ONCE AGAIN BE IN JEOPARDY. OTHER LOCATIONS ACROSS CENTRAL AND
NORTHERN WY HAVE A LOWER CONFIDENCE IN SEEING NEW MONTHLY
RECORDS BUT DAILY RECORDS WILL CERTAINLY BE ON THE TABLE.
ASIDE FROM RECORD BREAKING TEMPERATURES, THE MAIN FOCUS TODAY WILL
BE ON WIDESPREAD CRITICAL FIRE WEATHER CONDITIONS. WINDS WILL BEGIN
TO STRENGTHEN LATE THIS MORNING INTO THE EARLY AFTERNOON. THIS
IS THE RESULT OF A NEARING DISTURBANCE FURTHER TIGHTENING THE
PRESSURE GRADIENT. 700 MB WINDS ARE NOT TOO CONCERNING IN
REGARDS TO HIGH WIND HAZARDS BUT WITH VALUES OF 30 TO 50 KNOTS
THE FIRE WEATHER CONCERNS WILL ONLY BE EXACERBATED. WIND GUSTS
OF 30 TO 40 MPH ARE EXPECTED TO BE WIDESPREAD ACROSS LOWER
ELEVATIONS WEDNESDAY. PERIODIC GUSTS OF 50 MPH OR MORE WILL BE
POSSIBLE ACROSS CENTRAL BASINS AND ALONG THE CODY FOOTHILLS WITH
CHANCES RANGING FROM 40 TO 70%. MIN RH VALUES ARE FORECAST TO
DECREASE FURTHER, RANGING FROM 10 TO 15% ACROSS NEARLY ALL LOWER
ELEVATIONS. THE COMBINATION OF RECORD BREAKING TEMPERATURES,
GUSTY WINDS, AND LOW MIN RH VALUES WILL CREATE WIDESPREAD
CRITICAL FIRE WEATHER CONDITIONS WEDNESDAY AFTERNOON AND
EVENING. DUE TO THIS, RED FLAG WARNINGS HAVE BEEN ISSUED AND
WILL GO INTO EFFECT THIS AFTERNOON ACROSS NEARLY ALL LOWER
ELEVATIONS BESIDES WESTERN VALLEYS. SOME ADDITIONAL HIGHER
ELEVATION AREAS HAVE BEEN ADDED TO THE RED FLAG WARNING DUE TO
THE CURING OF FUELS. THESE LOCATIONS INCLUDE CASPER MTN ALONG
WITH THE SOUTHERN BIGHORNS AND BRIDGER MTNS.
A COLD FRONT BEGINS TO MOVE ACROSS THE STATE THURSDAY MORNING
BRINGING WITH IT COOLER TEMPERATURES AND PRECIPITATION CHANCES TO
THE PARTS OF THE STATE. HI-RES MODELS HAVE SHOWN SOME NEW LOCATIONS
THAT MAY HAVE CHANCES TO SEE SHOWERS. THE FIRST LOCATION LOOKS TO BE
ACROSS SOUTHERN WY FROM ROCK SPRINGS TO CASPER DURING THE EVENING ON
WEDNESDAY. SOME VERY WEAK SPLOTCHES OF INSTABILITY MAY BE CAPABLE OF
FUELING THE DEVELOPMENT OF AN ISOLATED SHOWER OR EVEN A WEAK
THUNDERSTORM. HOWEVER, DUE TO THE OVERALL DRYNESS OF THE LOWER
ATMOSPHERE, LITTLE TO NO PRECIPITATION WOULD REACH THE SURFACE.
CHANCES FOR THIS OCCURRING CURRENTLY SIT AROUND 10-30%. THE OTHER
LOCATION IS ALONG THE EASTERN BIGHORN BASIN AND PORTIONS OF JOHNSON
COUNTY AS THE FRONT MOVES THROUGH THURSDAY MORNING. THESE LOCATIONS
WOULD HAVE A BETTER CHANCE OF SEEING MOISTURE REACH THE SURFACE DUE
TO A MOISTENING OF THE ATMOSPHERE AS THE FRONT MOVES THROUGH.
TEMPERATURES ARE EXPECTED TO REMAIN WARM ENOUGH FOR ANY PRECIPITATION
TO FALL AS RAIN. THE LAST LOCATION IS THE NORTHERN BIGHORNS, WHERE A
QUICK INCH OR TWO MAY FALL OVER THE HIGHEST PEAKS OF THE NORTHERN
RANGE THURSDAY.
AS THE FRONT MOVES SOUTH THURSDAY, IT LOOKS TO STALL OVER
CENTRAL WY. THIS WILL LEAD TO WARMER AND DRIER CONDITIONS
LINGERING ACROSS SOUTHERN WY DURING THE DAY. WINDS LOOK TO
REMAIN GUSTY ACROSS MUCH OF THE STATE THURSDAY WITH WIDESPREAD
GUSTS OF 20 TO 30 MPH. STRONGER GUSTS OF 30 TO 40 MPH ARE
POSSIBLE ACROSS SOUTHERN WY AHEAD OF THE FRONT. OTHERWISE,
THURSDAY WILL SEE COOLER TEMPERATURES RANGING FROM THE 50S TO
MID 60S WITH THE WARMEST TEMPERATURES BEING OVER SOUTHERN WY. AS
A RESULT OF THE FRONT STALLING AND NOT MAKING ITS WAY THROUGH
SOUTHERN WY, CRITICAL FIRE WEATHER CONDITIONS LOOK LIKELY. SO
THE RED FLAG WARNINGS FOR SOUTHERN WY HAS BEEN EXTENDED INTO
THURSDAY EVENING.
THE REMAINDER OF THE WEEK INTO THE WEEKEND WILL SEE HIGH PRESSURE
ATTEMPT TO RE-ESTABLISH ITSELF POST FRONTAL PASSAGE. THIS LOOKS TO
TAKE A LITTLE TIME SO WARMING WILL BE GRADUAL WITH TEMPERATURES
GETTING BACK INTO THE 70S BY SATURDAY AND PERSISTING INTO EARLY NEXT
WEEK. AS FOR THE NEXT CHANCES FOR WIDESPREAD PRECIPITATION ACROSS
LOWER ELEVATIONS. THERE REMAINS SOME INDICATIONS OF AN UNSETTLED
PATTERN DEVELOPING FOR THE START OF APRIL. HOWEVER, AT THIS TIME
CONFIDENCE REMAINS LOW AND WITH THIS FALLING AROUND APRIL 1ST IT
WOULD NOT COME AS A SURPRISE IF THIS WAS JUST A CRUEL APRIL
FOOLS JOKE.
AVIATION /06Z TAFS THROUGH 06Z THURSDAY/
ISSUED AT 1050 PM MDT TUE MAR 24 2026
VFR CONDITIONS WILL PREVAIL THROUGH THE PERIOD AS RIDGING DOMINATES
ACROSS THE REGION. WIND WILL BE THE PRIMARY AVIATION CONCERN,
INCREASING AT MOST TERMINALS BETWEEN 15Z AND 18Z. GUSTS OF 25 TO 35
KNOTS WILL BE WIDESPREAD THROUGH WEDNESDAY AFTERNOON, WITH THE
STRONGEST GUSTS AT KCPR, KRIW, AND KRKS. WIND WILL QUICKLY DECREASE
AROUND SUNSET. CLOUD DECKS WILL REMAIN HIGH, SCATTERED TO BROKEN.
PLEASE SEE THE AVIATION WEATHER CENTER AND/OR CWSU ZDV AND ZLC FOR
THE LATEST INFORMATION ON ICING AND TURBULENCE FORECASTS.
FIRE WEATHER
ISSUED AT 306 AM MDT WED MAR 25 2026
WIDESPREAD CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED TODAY.
RECORD BREAKING WARMTH, DRY CONDITIONS AND GUSTY WINDS WILL BE
KEY CONTRIBUTERS TO THIS. WINDS STRENGTHEN LATE IN THE MORNING
WITH GUSTS OF 30 TO 50 MPH POSSIBLE AT TIMES. MIN RH VALUES WILL
DROP TO 10-15 PERCENT ACROSS NEARLY ALL LOWER ELEVATIONS. A FEW
VIRGA SHOWERS MAY BE POSSIBLE OVER SOUTHERN WY THIS EVENING
WITH A DRY LIGHTNING STRIKE OR TWO NOT OUT OF THE QUESTION. A
COLD FRONT MOVES THROUGH THURSDAY MORNING IMPROVING CONDITIONS
OVER CENTRAL AND NORTHERN WY. HOWEVER, DUE TO IT STALLING,
CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED TO PERSIST ACROSS
SOUTHERN WY FOR THURSDAY AFTERNOON AND EVENING.
RIW WATCHES/WARNINGS/ADVISORIES
RED FLAG WARNING FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR
WYZ275-276-280>283-285-289-300.
RED FLAG WARNING FROM NOON TODAY TO 9 PM MDT THURSDAY FOR
WYZ277>279.
DISCUSSION...DZIEWALTOWSKI
AVIATION...MYERS
FIRE WEATHER...DZIEWALTOWSKI
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