Headwater Guidance
Issued by NWS San Juan, PR

Home |  Current Version |  Previous Version |  Text Only |  Print | Product List |  Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
067
FOUS72 KALR 121840
FFHSJU
HEADWATER GUIDANCE...SAN JUAN CWA
NATIONAL WEATHER SERVICE
SOUTHEAST RIVER FORECAST CENTER...ATLANTA GA
237 PM EDT SAT JUL 12 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 20250712 Z DH18/DC202507121837 /DUE/PPHCF/PPTCF/PPQCF
:
:IDENT    1HR   3HR   6HR
:======= ====  ====  ====

AREP4     2.5/  3.6/  4.7
CAGP4     2.1/  3.2/  4.4
CIAP4     2.7/  3.6/  4.6
COAP4     2.5/  3.1/  4.1
COMP4     2.4/  3.3/  4.2
GURP4     2.1/  2.9/  3.9
HORP4     3.0/  5.0/  6.0
MANP4     1.8/  2.2/  2.9
MOCP4     1.5/  2.1/  3.1
RPOP4     1.4/  1.8/  2.4
SEBP4     1.7/  2.2/  3.0
TOAP4     2.3/  3.1/  4.1
VGBP4     2.6/  3.6/  4.6
:
:  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
$$
S.E.R.F.C. 770-486-0028 or 770-282-2112
Regular Hours 6am-10pm Eastern Time
After Hours Please Follow Callback Instructions