210  
FXUS65 KCYS 280740  
AFDCYS  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHEYENNE WY  
140 AM MDT THU AUG 28 2025  
   
KEY MESSAGES  
 
- SCATTERED PRECIPITATION CHANCES CONTINUE FOR FRIDAY AND  
SATURDAY, THOUGH DRIER CONDITIONS ARE EXPECTED TO RETURN THIS  
WEEKEND.  
 
- WARMING TREND STARTS SUNDAY ONWARDS, WITH FIRE WEATHER  
CONCERNS SLOWLY CREEPING UP TO START THE WORK WEEK.  
 
 
   
SHORT TERM /THROUGH FRIDAY NIGHT/  
 
ISSUED AT 139 AM MDT THU AUG 28 2025  
 
MOSTLY QUIET TONIGHT AS LOW STRATUS AND FOG DRIFTS ACROSS EASTERN  
PORTIONS OF THE CWA. RADAR HAS SLOWLY CLEARED OVER THE PAST FEW  
HOURS WITH NO SHOWERS CURRENTLY VISIBLE ON RADAR. CLEARING SKIES OUT  
WEST WILL ALLOW TEMPERATURES TO DROP QUICKER WEST OF THE LARAMIE  
RANGE, WHILE EAST OF THE LARAMIE RANGE IS EXPECTED TO REMAIN SOCKED  
IN WITH CLOUDS AND FOG THROUGHOUT THE NIGHT AND INTO THE MORNING  
HOURS. TEMPERATURES ARE MILD EAST OF THE LARAMIE RANGE, IN THE MID-  
50S TO LOW-60S, WHILE TEMPERATURES OUT WEST ARE IN THE LOW- TO MID-  
50S. LIGHT, VARIABLE WINDS ARE ONGOING ACROSS MUCH OF THE AREA AND  
EXPECTED TO CONTINUE INTO THE MORNING HOURS.  
 
UPPER-LEVEL RIDGING CONTINUES FOR THE NEXT SEVERAL DAYS AS THE UPPER-  
LEVEL RIDGE REMAINS FIXED IN PLACE ACROSS SOUTHERN PORTIONS OF THE  
INTERMOUNTAIN WEST. WITH THIS POSITIONING, WESTERLY FLOW WILL  
CONTINUE ALOFT AS THE CWA REMAINS UNDER THE NORTHERN EDGE OF THE  
RIDGE THROUGH SATURDAY MORNING. MULTIPLE 500MB VORTICITY MAXIMA WILL  
PUSH THROUGH THE REGION TODAY AND SATURDAY, LEADING TO CONTINUED  
DAILY PRECIPITATION CHANCES. WITH CONTINUED MONSOONAL MOISTURE  
ADVECTION INTO THE REGION, EXCESSIVE RAINFALL THREATS CONTINUE WITH  
BOTH FRIDAY AND SATURDAY FEATURING A MARGINAL RISK FROM THE WEATHER  
PREDICTION CENTER. 700MB WINDS WILL BE FAIRLY LIGHT, LEADING TO  
MOSTLY LIGHT SURFACE WINDS TODAY AND TOMORROW, THOUGH AN APPROACHING  
TROUGH MAY LEAD TO WIND INCREASES IN WESTERN PORTIONS OF THE REGION  
BY SATURDAY AFTERNOON INTO SUNDAY. A VERY DIFFUSE COLD FRONT PUSHES  
THROUGH TODAY, DROPPING 700MB TEMPERATURES A DEGREE OR TWO, BUT  
MAINLY ACTING AS ADDITIONAL FORCING FOR SHOWERS AND STORMS THIS  
AFTERNOON. SEVERE WEATHER IS NOT EXPECTED AT THIS TIME, THOUGH  
ISOLATED TO SCATTERED SHOWERS WILL BRING DECENT RAINFALL TO IMPACTED  
REGIONS. COVERAGE WILL BE LESS WIDESPREAD TODAY COMPARED TO  
THURSDAY, THOUGH MANY LOCATIONS WILL STILL LIKELY SEE PRECIPITATION.  
A WARMING TREND IS EXPECTED TO START SATURDAY INTO SUNDAY, THOUGH  
TEMPERATURES FRIDAY AND SATURDAY WILL REMAIN IN THE LOW-70S TO LOW-  
80S IN THE WARMEST LOCATIONS.  
 
 
   
LONG TERM /SATURDAY THROUGH WEDNESDAY/  
 
ISSUED AT 234 PM MDT WED AUG 27 2025  
 
FRIDAY...WEAK NORTHWEST FLOW ALOFT PREVAIL, AND WITH SLIGHTLY WARMER  
TEMPERATURES AS 700 MB TEMPERATURES RISE TO NEAR 11 CELSIUS. LOOKS  
LIKE ADEQUATE LOW AND MID LEVEL MOISTURE FOR SCATTERED AFTERNOON AND  
EVENING SHOWERS AND THUNDERSTORMS.  
 
SATURDAY...FOR THE PENULTIMATE DAY OF AUGUST, NORTHWEST FLOW ALOFT  
CONTINUES, AND WITH PLENTY OF LOW AND MID LEVEL MOISTURE AVAILABLE,  
WE EXPECT SCATTERED TO NUMEROUS AFTERNOON AND EVENING SHOWERS AND  
THUNDERSTORMS. COOLER TEMPERATURES DUE TO AN INCREASE IN CLOUD COVER  
AND PRECIPITATION COVERAGE.  
 
SUNDAY...RIDGING ALOFT BUILDS OVER WESTERN WYOMING, AND WITH  
ATMOSPHERIC MOISTURE DECREASING AND TEMPERATURES ALOFT INCREASING,  
THIS DAY LOOKS DRY, WITH WARMER TEMPERATURES COMPARED TO SATURDAY.  
 
MONDAY...THE RIDGE ALOFT CONTINUES AMPLIFIED, WHICH WILL EFFECTIVELY  
KEEP IT DRY. THE WARMING TREND CONTINUES WITH 700 MB TEMPERATURES  
NEAR 14 CELSIUS.  
 
TUESDAY...RIDGING ALOFT BREAKS DOWN SLIGHTLY AS A SHORTWAVE TROUGH  
ALOFT MOVES ACROSS THE REGION, AND WITH A SLIGHT INCREASE IN LOW AND  
MID LEVEL MOISTURE, WE EXPECT ISOLATED TO SCATTERED LATE DAY SHOWERS  
AND THUNDERSTORMS.  
 
WEDNESDAY...COOLER TEMPERATURES EXPECTED AFTER A COLD FRONTAL  
PASSAGE. LOOKS LIKE ADEQUATE LOW AND MID LEVEL MOISTURE TO PRODUCE  
SCATTERED LATE DAY SHOWERS AND THUNDERSTORMS.  
 
 
   
AVIATION /06Z TAFS THROUGH 06Z FRIDAY/  
 
ISSUED AT 1040 PM MDT WED AUG 27 2025  
 
ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS THURSDAY AS A WEAK  
STATIONARY FRONT DEVELOPS NEAR THE LARAMIE RANGE. PRIMARY FORECAST  
CHALLENGE TONIGHT AND EARLY THURSDAY MORNING WILL BE FOG AND LOW  
STRATUS ACROSS THE EASTERN PLAINS.  
 
HAZARDS/WEATHER TRENDS: PERSISTENT RAINFALL IS COMING TO AN END  
TONIGHT FOR MOST TERMINALS. MAY SEE LIGHT RAIN CONTINUING FOR KAIA  
AND KCYS OVER THE NEXT HOUR OR TWO, BUT THIS ACTIVITY SHOULD  
DISSIPATE SHORTLY AFTER 06Z. LOW CONFIDENCE AVIATION FORECAST FOR  
KCYS, KBFF, KSNY, AND KAIA THROUGH 15Z THURSDAY WITH VFR CONDITIONS  
EXPECTED TO CONTINUE FOR KRWL, KLAR, AND KCDR. MIXED SIGNALS FOR FOG  
TONIGHT WITH WEAK UPSLOPE FLOW...AT BEST, MID TO HIGH CLOUD COVER,  
BUT PLENTIFUL RAINFALL FOR FAR SE WYOMING AND THE CENTRAL/SOUTHERN  
NE PANHANDLE. PROBABILITIES FOR FOG HAVE TRENDED LOWER (20% TO 30%)  
COMPARED TO THE LAST FEW HOURS , BUT CAN'T RULE IT OUT BETWEEN 08Z  
AND 14Z THURSDAY...ESPECIALLY FOR KBFF, KAIA, AND KSNY. REGARDLESS,  
STILL EXPECT IFR CIGS AT MOST OF THESE TERMINALS AFTER 08Z.  
 
AFTERNOON THUNDERSTORMS WILL MAINLY IMPACT KLAR AND KCYS THURSDAY  
AFTERNOON, WITH A LOWER CHANCE AT KBFF AND KRWL. ADDED PROB30 GROUPS  
FOR THE MOST LIKELY TIMING.  
 
 
   
CYS WATCHES/WARNINGS/ADVISORIES  
 
WY...NONE.  
NE...NONE.  
 
 
 
 
 
SHORT TERM...AM  
LONG TERM...RUBIN  
AVIATION...TJT  
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