Headwater Guidance
Issued by NWS Columbia, SC

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797
FOUS72 KALR 161917
FFHCAE
HEADWATER GUIDANCE...COLUMBIA CWA
NATIONAL WEATHER SERVICE
SOUTHEAST RIVER FORECAST CENTER...ATLANTA GA
316 PM EDT WED JUL 16 2025

INCHES OF RAINFALL FOR SPECIFIED DURATIONS REQUIRED TO PRODUCE
FLASH FLOODING IN HEADWATERS.  LOWER AMOUNTS MAY CAUSE
FLASH FLOODING IN URBAN OR MOUNTAINOUS AREAS.

.B ALR 20250716 Z DH18/DC202507161916 /DUE/PPHCF/PPTCF/PPQCF/PPKCF/PPDCF
:
:IDENT    1HR   3HR   6HR  12HR  24HR
:======= ====  ====  ====  ====  ====

BLRS1     3.0/  4.5/  5.2/  6.6/  8.0
MODS1     3.0/  3.7/  4.1/  4.7/  5.7
ORBS1     2.7/  4.0/  6.0/  7.0/  8.0
:
:  TO USE HEADWATER ADVISORY TABLES TAKE THE THREE HOUR VALUE ABOVE FOR
:  THAT LOCATION AND USE THE FOLLOWING RELATIONS...
:      TABLE 1 /   0 TO 2.4 IN        TABLE 4 / 4.1 TO 4.5 IN
:            2 / 2.5 TO 3.3 IN              5 / 4.6 TO 4.9 IN
:            3 / 3.4 TO 4.0 IN              6 / 5.0 IN
:
.END
$$
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