821  
FXUS65 KBOU 290133  
AFDBOU  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE DENVER/BOULDER CO  
733 PM MDT THU AUG 28 2025  
   
KEY MESSAGES
 
 
 
- SCATTERED TO NUMEROUS STORMS THROUGH SATURDAY WITH LOCALLY HEAVY  
RAINFALL IN A FEW AREAS. AN ISOLATED SEVERE STORM POSSIBLE AS  
WELL.  
 
- WARMER AND DRIER SUNDAY THROUGH TUESDAY.  
 

 
   
DISCUSSION /THROUGH THURSDAY/
 
 
ISSUED AT 224 PM MDT THU AUG 28 2025  
 
MLCAPE THIS AFTN WAS UP TO 1500 J/KG OVER THE PLAINS WITH MID LEVEL  
FLOW IN THE 20-25 KT RANGE. OVERALL LOW LEVEL FLOW WAS VERY WEAK  
ACROSS THE PLAINS. WITH FAVORABLE INSTABILITY, WILL SEE SCT MAINLY  
OUTFLOWED DOMINANT STORMS FROM THE HIGHER TERRAIN ACROSS THE PLAINS.  
THERE IS A LOW THREAT FOR A MARGINAL SVR STORM OVER THE PLAINS THRU  
THE EVENING HOURS. MEANWHILE, STORMS WILL BE MOVING SO THREAT OF  
FLASH FLOODING WILL BE LOW IN MOST AREAS. OVERNIGHT, AS LOW LEVEL  
FLOW BEGINS TO INCREASE MAY SEE AN INCREASE IN TSTM ACTIVITY OVER  
THE EAST CENTRAL PLAINS, ESPECIALLY OVER LINCOLN COUNTY.  
 
ON FRI, WILL SEE ANOTHER ROUND OF SCT SHOWERS AND TSTMS. MLCAPE  
WILL RANGE FROM 1000-1500 J/KG MAINLY OVER THE FAR ERN PLAINS. ONCE  
AGAIN THERE COULD BE AN ISOLD MARGINAL SVR STORM WHERE THE BEST  
INSTABILITY EXISTS. HIGHS ON FRI WILL REMAIN SLIGHTLY BELOW  
SEASONAL NORMALS.  
 
BY SAT, THE FLOW ALOFT WILL BECOME MORE NWLY AS A COOL FRONT MOVES  
INTO NERN CO. THERE COULD BE A DISTURBANCE EMBEDDED IN THE FLOW  
ALOFT WHICH MAY INCREASE TSTM CHANCES ACROSS THE AREA. ONCE AGAIN  
MAY SEE LOCALLY HEAVY RAIN WITH SOME OF THE STORMS WITH AN ISOLD SVR  
STORM POSSIBLE. HIGHS ON SAT WILL REMAIN BELOW NORMAL.  
 
FROM SUN THRU TUE A DRIER AND SOMEWHAT WARMER PATTERN WILL DEVELOP  
ACROSS THE AREA AS AN UPPER LEVEL RIDGE BUILDS FROM THE GREAT BASIN  
INTO THE PACIFIC NW.  
 
THE NEXT PATTERN CHANGE MAY OCCUR BY THE MIDDLE OF NEXT WEEK. THE  
ECMWF HAS A STRONG UPPER LEVEL TROUGH OVER THE GREAT LAKES AND UPPER  
MIDWEST WITH NNW FLOW ALOFT OVER THE AREA. THIS ALLOWS FOR MUCH  
COOLER AIR TO MOVE INTO THE AREA FOR WED AND THU. ON THE FLIP SIDE  
THE GFS HAS A LESS AMPLIFIED TROUGH WITH THE COOLER AIR STAYING  
MAINLY TO THE EAST. FOR NOW IT'S HARD TO SAY WHICH MODEL MAY VERIFY  
THIS FAR OUT.  
 

 
   
AVIATION /00Z TAFS THROUGH 00Z SATURDAY/
 
 
ISSUED AT 730 PM MDT THU AUG 28 2025  
 
CONVECTION IS NEARLY OVER AT DIA THIS EVENING. THE EASTWARD  
MOVING CONVECTION KILLED A DECENT BOUNDARY PUSHING TOWARDS THE  
AIRPORT FROM THE NORTHEAST. OUTFLOW WINDS GUSTED CLOSE TO 40 KNOTS  
WITH THE EARLIER CONVECTION AND THERE WAS A BRIEF PERIOD OF HEAVY  
RAIN. MODELS EVENTUALLY SHOW NORMAL DRAINAGE WIND PATTERNS AT DIA  
BY AROUND 06Z. WILL LEAVE A VCFG IN THE TAF FROM 10Z-15Z EARLY  
FRIDAY, HOWEVER NONE OF MODELS ARE NOW SHOWING ANY LOW STRATUS,  
LOW VISIBILITIES OR NORTHWESTERLY WINDS AT THE AIRPORT LATE  
TONIGHT INTO FRIDAY MORNING. THEY ALL KEEP SOME SORT OF WEAK  
DRAINAGE BLOWING WELL PAST SUNRISE. SO NO TEMPO FOG FOR THE 00Z  
DEN TAF.  
 

 
   
HYDROLOGY
 
 
ISSUED AT 224 PM MDT THU AUG 28 2025  
 
SCATTERED SHOWERS AND THUNDERSTORMS WILL OCCUR THROUGH SATURDAY  
WITH LOCALLY HEAVY RAIN IN SOME AREAS, ESPECIALLY ON SATURDAY.  
DRIER AIR WILL MOVE INTO THE AREA ON SUNDAY AND CONTINUE THROUGH  
EARLY NEXT WEEK WITH ONLY ISOLATED THUNDERSTORMS OVER THE HIGHER  
TERRAIN.  
 

 
   
BOU WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  
 

 
 

 
 
DISCUSSION...RPK  
AVIATION.....RJK  
HYDROLOGY....RPK  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab CO Page Main Text Page