265
AWUS01 KWNH 272105
FFGMPD
MTZ000-280300-
MESOSCALE PRECIPITATION DISCUSSION 0542
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
504 PM EDT SAT JUN 27 2026
AREAS AFFECTED...EAST CENTRAL MONTANA
CONCERNING...HEAVY RAINFALL...FLASH FLOODING POSSIBLE
VALID 272103Z - 280300Z
SUMMARY...INCREASING COVERAGE OF SLOW MOVING THUNDERSTORMS IS
EXPECTED THROUGH THE LATE AFTERNOON AND INTO THE EVENING HOURS.
BACKBUILDING CELLS MAY PRODUCE RAINFALL RATES IN EXCESS OF AN INCH
PER HOUR THAT COULD RESULT IN SOME FLOODING ISSUES.
DISCUSSION...RECENT DOPPLER RADAR AND GOES-E SATELLITE IMAGERY ARE
INDICATING A STEADY INCREASE IN CONVECTION ACROSS PORTIONS OF
SOUTHEASTERN MONTANA, WITH THE HEAVIEST CELLS IN THE GENERAL
VICINITY OF THE INTERSTATE 90 CORRIDOR NEAR BILLINGS AND POINTS
SOUTH AND EAST ACROSS THE CROW RESERVATION. THERE HAS ALSO BEEN
MORE BACKBUILDING OF THE CONVECTION ACROSS THIS AREA, AND LEADING
TO ENHANCED RAINFALL RATES EXCEEDING AN INCH PER HOUR.
ENVIRONMENTAL PARAMETERS ARE CONDUCIVE FOR HEAVY RAINFALL GIVEN
ANOMALOUS PWS ON THE ORDER OF 1 INCH, COUPLED WITH STRONG LEFT
EXIT REGION DYNAMICS FROM A DEEP UPPER TROUGH TO THE WEST
PROMOTING DEEP LAYER ASCENT. RECENT CAM GUIDANCE DEPICTS PATCHY
AREAS OF 1-2 INCH RAINFALL TOTALS THROUGH 9 PM LOCAL TIME, WITH
MUCH OF THIS FALLING WITHIN A TWO HOUR TIME PERIOD FOR ANY GIVEN
LOCATION. THIS MAY BE ENOUGH TO RESULT IN SOME INSTANCES OF FLASH
FLOODING ACROSS THE OUTLOOK AREA.
HAMRICK
..PLEASE SEE WWW.WPC.NCEP.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...BYZ...GGW...
ATTN...RFC...KRF...NWC...
LAT...LON 48980650 48950510 48810452 47830458 46570531
45460600 45100660 45060796 45170837 45780865
46510843 47630807 48790727
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