143
NOUS45 KCYS 071854
PNSCYS
NEZ002-003-019>021-054-055-095-096-WYZ101>119-080654-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1254 PM MDT FRI AUG 7 2026
LONG TERM – 12Z SUNDAY ONWARD
A SUPPRESSED RIDGE PATTERN WILL CONTINUE THROUGHOUT THE MAJORITY OF THE LONG-TERM FORECAST PERIOD. MONSOONAL RIDGING THROUGHOUT THE WEEKEND WILL GRADUALLY SUBSIDE, WITH THE 500MB JET GENERALLY POSITIONED FROM THE WASHINGTON/OREGON CASCADES AND STRETCHING ACROSS THE NORTHERN ROCKIES INTO THE HIGH PLAINS OF MONTANA AND NORTHERN WYOMING. SOUTH OF THIS FEATURE, GRADUALLY DEEPENING MOISTURE WILL SPREAD ACROSS THE CENTRAL AND SOUTHERN ROCKIES FROM THE FOUR CORNERS EASTWARD THROUGH THE HIGH PLAINS. PWAT VALUES AT SELECTED SITES ACROSS SOUTHEAST WYOMING AND WESTERN NEBRASKA ALL SHOW A STEADY RISE EACH DAY FROM SUNDAY THROUGH THE END OF THE WEEK. THIS WILL LEAD TO INCREASING COVERAGE OF SHOWERS AND THUNDERSTORMS EACH DAY. BY THE WEDNESDAY-FRIDAY TIMEFRAME PWAT NORMALIZED ANOMALIES IN ENSEMBLE GUIDANCE WILL RUN AROUND 2 TO 2.5 STANDARD DEVIATIONS ABOVE THE MEAN. THIS WILL RESULT IN HIGH CONFIDENCE OF AFTERNOON THUNDERSTORMS, SOME OF WHICH MAY CONTAIN HEAVY DRENCHING DOWNPOURS. DESPITE BETTER THUNDERSTORM CHANCES, SEVERE WEATHER REMAINS GENERALLY UNLIKELY IN SOUTHEAST WYOMING WITH MOSTLY LIGHT WESTERLY FLOW IN THE MID AND UPPER-LEVELS PRESENT. FARTHER EAST INTO THE NEBRASKA PANHANDLE, SOME FASTER FLOW ALOFT WILL BEGIN TO IMPINGE ON THE AREA FROM THE NORTH BY WEDNESDAY AS THE AFOREMENTIONED RIDGE OF HIGH PRESSURE CONTINUES TO BECOME MORE SUPPRESSED TO THE SOUTH. LOW-END WIND SHEAR VALUES ON THE ORDER OF 30-40 KNOTS MAY ASSIST WITH MULTICELL STORM MODES THAT COULD PRODUCE ORGANIZED OUTFLOW WIND EVENTS DURING THE AFTERNOON HOURS FROM WEDNESDAY THROUGH FRIDAY. HIGH CONFIDENCE EXISTS IN ABOVE-NORMAL TEMPERATURES CONTINUING THROUGH THE ENTIRE LONG-TERM PERIOD. HOWEVER, INCREASING COVERAGE OF AFTERNOON THUNDERSTORMS FROM MID-WEEK ONWARD WILL LIKELY LIMIT TEMPERATURES SOMEWHAT, GENERALLY RUNNING AROUND 10 DEGREES ABOVE NORMAL INSTEAD OF THE NEAR-RECORD DAILY HEAT WE WILL EXPERIENCE THIS WEEKEND. OVERALL, GENERALLY HIGH CONFIDENCE EXISTS IN THE LONG-TERM PERIOD WITH EXCELLENT AGREEMENT IN ENSEMBLE GUIDANCE WITH REGARD TO SYNOPTIC FORECAST FEATURES.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page