587
AWUS01 KWNH 172004
FFGMPD
GAZ000-180100-
MESOSCALE PRECIPITATION DISCUSSION 0757
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
403 PM EDT FRI JUL 17 2026
AREAS AFFECTED...GREATER ATLANTA
CONCERNING...HEAVY RAINFALL...FLASH FLOODING LIKELY
VALID 172003Z - 180100Z
SUMMARY...MULTI-CELL THUNDERSTORMS CLUSTER WITH TORRENTIAL
RAINFALL RATES TO 3"/HR WILL CONTINUE TO CAUSE LOCALIZED FLASH
FLOODING OVER THE GREATER ATLANTA METRO AREA INTO CENTRAL GEORGIA
INTO THE EVENING.
DISCUSSION...AS OF 20Z...A MULTI-CELL CLUSTER HAS DEVELOPED OVER
THE NORTH SIDE OF THE ATLANTA METRO ALONG A SURFACE TROUGH AXIS.
THIS ACTIVITY SHOULD CONTINUE TO PROPAGATE SOUTH OVER THE REST OF
THE ATLANTA METRO TO CENTRAL GA REST OF THIS AFTERNOON. AMPLE
INSTABILITY WITH MCLAPE OF 3500 J/KG IS PROMOTING VIGOROUS GROWTH
WHILE LIGHT FLOW IS KEEPING STORM MOTION SLOW WITH OUTFLOW AIDING
FURTHER DEVELOPMENT. ELEVATED MOISTURE IS PRESENT WITH PW OF 2.1
TO 2.2" (ABOUT 1.5 SIGMA ABOVE NORMAL) WITH DEEP WARM CLOUD LAYERS
AND MAX RAIN RATES AROUND 3"/HR EXPECTED TO CONTINUE.
RECENT HRRR RUNS ARE UNDERDOING THIS ACTIVITY WITH THE RRFS
DISPLACED, BUT REASONABLE FOR RAINFALL OF 2-4" IN SCATTERED AREAS.
MUCH OF THE AREA HAS FFG OF 2.5"/HR AND LOCALLY LOWER IN THE
ATLANTA METRO. FLASH FLOODING SHOULD REMAIN LIMITED TO URBANIZED
AREAS, BUT ENOUGH REPEATING ACTIVITY WOULD CAUSE EXCESSIVE
RAINFALL ANYWHERE IN THE OUTLOOK AREA. LOCALIZED FLASH FLOODING
CAN BE EXPECTED TO CONTINUE INTO THIS EVENING.
JACKSON
..PLEASE SEE WWW.WPC.NCEP.NOAA.GOV FOR GRAPHIC PRODUCT
ATTN...WFO...FFC...
ATTN...RFC...ALR...NWC...
LAT...LON 34368381 33348289 32428335 32608425 32878462
33838505 34268490
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page