AWUS01 KWNH 111239
FFGMPD
SCZ000-111600-

Mesoscale Precipitation Discussion 0905
NWS Weather Prediction Center College Park MD
838 AM EDT Mon Aug 11 2025

Areas affected...Greater Charleston SC Metro

Concerning...Heavy rainfall...Flash flooding possible

Valid 111237Z - 111600Z

Summary...Heavy thunderstorms with hourly rainfall of 2 to 3
inches should continue to lift up the SC coast this morning. At
the current pace, the heavy rates would impact Charleston near
morning high tide which would enhance localized flooding.

Discussion...A band of heavy thunderstorms is currently pushing
inland and up the coast between Hilton Head Island and Charleston.
This is being fed by 25kt Sly flow with PW still around 2.25" with
a high instability gradient with 3000 J/kg just offshore per the
RAP. Max hourly rainfall is estimated from KCLX in Charleston
County south of the Charleston metro.

As onshore flow persists this activity should persist along and
just inland from the coast with a northward trend. This would
place torrential rain over the Charleston metro near the 10a high
tide which would enhanced the localized flooding risk.
Furthermore, the 1hr FFG is generally around 2.5", so localized
flash flooding is possible over the areas impacted by this heavy
band. As of now the offshore component of the activity is somewhat
disorganized and the cloud tops have recently begun a warming
trend. However, given the high instability, redevelopment is
possible which makes for a possible flash flood risk rest of the
morning around the greater Charleston metro.

Jackson

ATTN...WFO...CHS...

ATTN...RFC...ALR...NWC...

LAT...LON   33338015 33027946 32607964 32478033 32798053 
            32988056 

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