Headwater Guidance
Issued by NWS San Juan, PR

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118
FOUS72 KALR 300042
FFHSJU
HEADWATER GUIDANCE...SAN JUAN CWA
NATIONAL WEATHER SERVICE
SOUTHEAST RIVER FORECAST CENTER...ATLANTA GA
840 PM EDT FRI AUG 29 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 20250830 Z DH00/DC202508300040 /DUE/PPHCF/PPTCF/PPQCF
:
:IDENT    1HR   3HR   6HR
:======= ====  ====  ====

AREP4     1.6/  2.1/  2.8
CAGP4     2.3/  3.3/  4.5
CIAP4     1.7/  2.1/  2.7
COAP4     2.1/  2.5/  3.3
COMP4     1.8/  2.1/  2.7
GURP4     2.1/  2.7/  3.6
HORP4     2.4/  2.9/  3.5
MANP4     1.4/  1.7/  2.3
MOCP4     1.2/  1.6/  2.2
RPOP4     1.4/  1.8/  2.3
SEBP4     1.6/  1.9/  2.5
TOAP4     1.6/  2.0/  2.7
VGBP4     1.6/  2.1/  2.8
:
:  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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