National Weather Service California-Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SAN JOAQUIN RIVER - PATTERSON (PATC1)
Latitude: 37.49º NLongitude: 121.08º WElevation: 97 FeetForecast Type: Official Location
Location: Stanislaus County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Oct 24 2026 at 1:17 PM PDTNext Issuance: Oct 25 2026 at 9:00 AM PDT
Action: 48.0 FeetMinor Flood: 54.7 FeetModerate Flood: 57.3 FeetMajor Flood: 58.3 Feet


# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River - Patterson (PATC1)
#
# File Generation Time:  10/24/2026 at 01:17 PM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  10/24/2026 at 08:00 AM PDT
# Maximum Observed Stage:                       31.41 Feet
# Maximum Observed Flow:                        678 cfs
#
# Earliest Date & Time of Maximum Forecast:     10/26/2026 at 07:00 AM PDT
# Maximum Forecast Stage:                       32.70 Feet
# Maximum Forecast Flow:                        1150 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  10/19/2026 01 PM PDT           31.03            567                        Normal
  10/19/2026 02 PM PDT           31.02            564         -              Normal
  10/19/2026 03 PM PDT           31.02            564         0              Normal
  10/19/2026 04 PM PDT           31.03            567         +              Normal
  10/19/2026 05 PM PDT           31.03            567         0              Normal
  10/19/2026 06 PM PDT           31.02            564         -              Normal
  10/19/2026 07 PM PDT           31.02            564         0              Normal
  10/19/2026 08 PM PDT           31.02            564         0              Normal
  10/19/2026 09 PM PDT           31.01            561         -              Normal
  10/19/2026 10 PM PDT           31.01            561         0              Normal
  10/19/2026 11 PM PDT           31.01            561         0              Normal
  10/20/2026 12 AM PDT           31.00            559         -              Normal
  10/20/2026 01 AM PDT           31.00            559         0              Normal
  10/20/2026 02 AM PDT           31.00            559         0              Normal
  10/20/2026 03 AM PDT           30.99            556         -              Normal
  10/20/2026 04 AM PDT           30.99            556         0              Normal
  10/20/2026 05 AM PDT           30.99            556         0              Normal
  10/20/2026 06 AM PDT           30.99            556         0              Normal
  10/20/2026 07 AM PDT           30.98            553         -              Normal
  10/20/2026 08 AM PDT           30.99            556         +              Normal
  10/20/2026 09 AM PDT           30.96            547         -              Normal
  10/20/2026 10 AM PDT           30.96            547         0              Normal
  10/20/2026 11 AM PDT           30.97            550         +              Normal
  10/20/2026 12 PM PDT           30.96            547         -              Normal
  10/20/2026 01 PM PDT           30.95            545         -              Normal
  10/20/2026 02 PM PDT           30.96            547         +              Normal
  10/20/2026 03 PM PDT           30.95            545         -              Normal
  10/20/2026 04 PM PDT           30.95            545         0              Normal
  10/20/2026 05 PM PDT           30.95            545         0              Normal
  10/20/2026 06 PM PDT           30.95            545         0              Normal
  10/20/2026 07 PM PDT           30.95            545         0              Normal
  10/20/2026 08 PM PDT           30.95            545         0              Normal
  10/20/2026 09 PM PDT           30.96            547         +              Normal
  10/20/2026 10 PM PDT           30.97            550         +              Normal
  10/20/2026 11 PM PDT           30.98            553         +              Normal
  10/21/2026 12 AM PDT           30.98            553         0              Normal
  10/21/2026 01 AM PDT           30.99            556         +              Normal
  10/21/2026 02 AM PDT           31.00            559         +              Normal
  10/21/2026 03 AM PDT           31.01            561         +              Normal
  10/21/2026 04 AM PDT           31.00            559         -              Normal
  10/21/2026 05 AM PDT           31.00            559         0              Normal
  10/21/2026 06 AM PDT           31.00            559         0              Normal
  10/21/2026 07 AM PDT           31.00            559         0              Normal
  10/21/2026 08 AM PDT           30.99            556         -              Normal
  10/21/2026 09 AM PDT           30.98            553         -              Normal
  10/21/2026 10 AM PDT           30.98            553         0              Normal
  10/21/2026 11 AM PDT           31.00            559         +              Normal
  10/21/2026 12 PM PDT           30.99            556         -              Normal
  10/21/2026 01 PM PDT           30.99            556         0              Normal
  10/21/2026 02 PM PDT           31.00            559         +              Normal
  10/21/2026 03 PM PDT           31.00            559         0              Normal
  10/21/2026 04 PM PDT           31.01            561         +              Normal
  10/21/2026 05 PM PDT           31.03            567         +              Normal
  10/21/2026 06 PM PDT           31.03            567         0              Normal
  10/21/2026 07 PM PDT           31.05            573         +              Normal
  10/21/2026 08 PM PDT           31.05            573         0              Normal
  10/21/2026 09 PM PDT           31.04            570         -              Normal
  10/21/2026 10 PM PDT           31.05            573         +              Normal
  10/21/2026 11 PM PDT           31.05            573         0              Normal
  10/22/2026 12 AM PDT           31.05            573         0              Normal
  10/22/2026 01 AM PDT           31.05            573         0              Normal
  10/22/2026 02 AM PDT           31.05            573         0              Normal
  10/22/2026 03 AM PDT           31.05            573         0              Normal
  10/22/2026 04 AM PDT           31.09            584         +              Normal
  10/22/2026 05 AM PDT           31.10            587         +              Normal
  10/22/2026 06 AM PDT           31.10            587         0              Normal
  10/22/2026 07 AM PDT           31.12            593         +              Normal
  10/22/2026 08 AM PDT           31.12            593         0              Normal
  10/22/2026 09 AM PDT           31.13            595         +              Normal
  10/22/2026 10 AM PDT           31.14            598         +              Normal
  10/22/2026 11 AM PDT           31.15            601         +              Normal
  10/22/2026 12 PM PDT           31.17            607         +              Normal
  10/22/2026 01 PM PDT           31.18            610         +              Normal
  10/22/2026 02 PM PDT           31.19            613         +              Normal
  10/22/2026 03 PM PDT           31.19            613         0              Normal
  10/22/2026 04 PM PDT           31.20            616         +              Normal
  10/22/2026 05 PM PDT           31.22            622         +              Normal
  10/22/2026 06 PM PDT           31.23            624         +              Normal
  10/22/2026 07 PM PDT           31.24            627         +              Normal
  10/22/2026 08 PM PDT           31.24            627         0              Normal
  10/22/2026 09 PM PDT           31.26            633         +              Normal
  10/22/2026 10 PM PDT           31.26            633         0              Normal
  10/22/2026 11 PM PDT           31.23            624         -              Normal
  10/23/2026 12 AM PDT           31.24            627         +              Normal
  10/23/2026 01 AM PDT           31.24            627         0              Normal
  10/23/2026 02 AM PDT           31.23            624         -              Normal
  10/23/2026 03 AM PDT           31.23            624         0              Normal
  10/23/2026 04 AM PDT           31.23            624         0              Normal
  10/23/2026 05 AM PDT           31.22            622         -              Normal
  10/23/2026 06 AM PDT           31.23            624         +              Normal
  10/23/2026 07 AM PDT           31.24            627         +              Normal
  10/23/2026 08 AM PDT           31.25            630         +              Normal
  10/23/2026 09 AM PDT           31.27            636         +              Normal
  10/23/2026 10 AM PDT           31.30            645         +              Normal
  10/23/2026 11 AM PDT           31.27            636         -              Normal
  10/23/2026 12 PM PDT           31.29            642         +              Normal
  10/23/2026 01 PM PDT           31.31            648         +              Normal
  10/23/2026 02 PM PDT           31.36            663         +              Normal
  10/23/2026 03 PM PDT           31.36            663         0              Normal
  10/23/2026 04 PM PDT           31.35            660         -              Normal
  10/23/2026 05 PM PDT           31.37            666         +              Normal
  10/23/2026 06 PM PDT           31.38            669         +              Normal
  10/23/2026 07 PM PDT           31.37            666         -              Normal
  10/23/2026 08 PM PDT           31.38            669         +              Normal
  10/23/2026 09 PM PDT           31.38            669         0              Normal
  10/23/2026 10 PM PDT           31.38            669         0              Normal
  10/23/2026 11 PM PDT           31.38            669         0              Normal
  10/24/2026 12 AM PDT           31.38            669         0              Normal
  10/24/2026 01 AM PDT           31.38            669         0              Normal
  10/24/2026 02 AM PDT           31.39            672         +              Normal
  10/24/2026 03 AM PDT           31.39            672         0              Normal
  10/24/2026 04 AM PDT           31.40            675         +              Normal
  10/24/2026 05 AM PDT           31.41            678         +              Normal
  10/24/2026 06 AM PDT           31.41            678         0              Normal
  10/24/2026 07 AM PDT           31.41            678         0              Normal
  10/24/2026 08 AM PDT           31.41            678         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  10/24/2026 01 PM PDT           31.45            691                        Normal
  10/24/2026 02 PM PDT           31.47            698         +              Normal
  10/24/2026 03 PM PDT           31.49            705         +              Normal
  10/24/2026 04 PM PDT           31.51            711         +              Normal
  10/24/2026 05 PM PDT           31.53            718         +              Normal
  10/24/2026 06 PM PDT           31.55            725         +              Normal
  10/24/2026 07 PM PDT           31.58            735         +              Normal
  10/24/2026 08 PM PDT           31.61            745         +              Normal
  10/24/2026 09 PM PDT           31.64            755         +              Normal
  10/24/2026 10 PM PDT           31.67            765         +              Normal
  10/24/2026 11 PM PDT           31.70            776         +              Normal
  10/25/2026 12 AM PDT           31.73            786         +              Normal
  10/25/2026 01 AM PDT           31.77            800         +              Normal
  10/25/2026 02 AM PDT           31.81            814         +              Normal
  10/25/2026 03 AM PDT           31.84            825         +              Normal
  10/25/2026 04 AM PDT           31.88            839         +              Normal
  10/25/2026 05 AM PDT           31.92            853         +              Normal
  10/25/2026 06 AM PDT           31.96            868         +              Normal
  10/25/2026 07 AM PDT           31.99            879         +              Normal
  10/25/2026 08 AM PDT           32.03            893         +              Normal
  10/25/2026 09 AM PDT           32.06            905         +              Normal
  10/25/2026 10 AM PDT           32.10            919         +              Normal
  10/25/2026 11 AM PDT           32.14            934         +              Normal
  10/25/2026 12 PM PDT           32.18            949         +              Normal
  10/25/2026 01 PM PDT           32.22            964         +              Normal
  10/25/2026 02 PM PDT           32.26            980         +              Normal
  10/25/2026 03 PM PDT           32.30            995         +              Normal
  10/25/2026 04 PM PDT           32.34           1010         +              Normal
  10/25/2026 05 PM PDT           32.37           1021         +              Normal
  10/25/2026 06 PM PDT           32.41           1037         +              Normal
  10/25/2026 07 PM PDT           32.45           1052         +              Normal
  10/25/2026 08 PM PDT           32.48           1064         +              Normal
  10/25/2026 09 PM PDT           32.52           1079         +              Normal
  10/25/2026 10 PM PDT           32.55           1091         +              Normal
  10/25/2026 11 PM PDT           32.58           1103         +              Normal
  10/26/2026 12 AM PDT           32.60           1110         +              Normal
  10/26/2026 01 AM PDT           32.63           1122         +              Normal
  10/26/2026 02 AM PDT           32.65           1130         +              Normal
  10/26/2026 03 AM PDT           32.66           1134         +              Normal
  10/26/2026 04 AM PDT           32.67           1138         +              Normal
  10/26/2026 05 AM PDT           32.69           1146         +              Normal
  10/26/2026 06 AM PDT           32.69           1146         0              Normal
  10/26/2026 07 AM PDT           32.70           1150         +              Normal
  10/26/2026 08 AM PDT           32.70           1150         0              Normal
  10/26/2026 09 AM PDT           32.70           1150         0              Normal
  10/26/2026 10 AM PDT           32.70           1150         0              Normal
  10/26/2026 11 AM PDT           32.69           1146         -              Normal
  10/26/2026 12 PM PDT           32.69           1146         0              Normal
  10/26/2026 01 PM PDT           32.68           1142         -              Normal
  10/26/2026 02 PM PDT           32.67           1138         -              Normal
  10/26/2026 03 PM PDT           32.66           1134         -              Normal
  10/26/2026 04 PM PDT           32.65           1130         -              Normal
  10/26/2026 05 PM PDT           32.64           1126         -              Normal
  10/26/2026 06 PM PDT           32.63           1122         -              Normal
  10/26/2026 07 PM PDT           32.62           1118         -              Normal
  10/26/2026 08 PM PDT           32.60           1110         -              Normal
  10/26/2026 09 PM PDT           32.59           1106         -              Normal
  10/26/2026 10 PM PDT           32.58           1103         -              Normal
  10/26/2026 11 PM PDT           32.56           1095         -              Normal
  10/27/2026 12 AM PDT           32.55           1091         -              Normal
  10/27/2026 01 AM PDT           32.53           1083         -              Normal
  10/27/2026 02 AM PDT           32.52           1079         -              Normal
  10/27/2026 03 AM PDT           32.51           1075         -              Normal
  10/27/2026 04 AM PDT           32.49           1067         -              Normal
  10/27/2026 05 AM PDT           32.48           1064         -              Normal
  10/27/2026 06 AM PDT           32.46           1056         -              Normal
  10/27/2026 07 AM PDT           32.45           1052         -              Normal
  10/27/2026 08 AM PDT           32.44           1048         -              Normal
  10/27/2026 09 AM PDT           32.43           1044         -              Normal
  10/27/2026 10 AM PDT           32.41           1037         -              Normal
  10/27/2026 11 AM PDT           32.40           1033         -              Normal
  10/27/2026 12 PM PDT           32.39           1029         -              Normal
  10/27/2026 01 PM PDT           32.38           1025         -              Normal
  10/27/2026 02 PM PDT           32.37           1021         -              Normal
  10/27/2026 03 PM PDT           32.36           1018         -              Normal
  10/27/2026 04 PM PDT           32.35           1014         -              Normal
  10/27/2026 05 PM PDT           32.34           1010         -              Normal
  10/27/2026 06 PM PDT           32.34           1010         0              Normal
  10/27/2026 07 PM PDT           32.33           1006         -              Normal
  10/27/2026 08 PM PDT           32.32           1003         -              Normal
  10/27/2026 09 PM PDT           32.31            999         -              Normal
  10/27/2026 10 PM PDT           32.31            999         0              Normal
  10/27/2026 11 PM PDT           32.30            995         -              Normal
  10/28/2026 12 AM PDT           32.29            991         -              Normal
  10/28/2026 01 AM PDT           32.29            991         0              Normal
  10/28/2026 02 AM PDT           32.28            987         -              Normal
  10/28/2026 03 AM PDT           32.28            987         0              Normal
  10/28/2026 04 AM PDT           32.27            983         -              Normal
  10/28/2026 05 AM PDT           32.27            983         0              Normal
  10/28/2026 06 AM PDT           32.26            980         -              Normal
  10/28/2026 07 AM PDT           32.26            980         0              Normal
  10/28/2026 08 AM PDT           32.25            976         -              Normal
  10/28/2026 09 AM PDT           32.25            976         0              Normal
  10/28/2026 10 AM PDT           32.25            976         0              Normal
  10/28/2026 11 AM PDT           32.24            972         -              Normal
  10/28/2026 12 PM PDT           32.24            972         0              Normal
  10/28/2026 01 PM PDT           32.24            972         0              Normal
  10/28/2026 02 PM PDT           32.23            968         -              Normal
  10/28/2026 03 PM PDT           32.23            968         0              Normal
  10/28/2026 04 PM PDT           32.23            968         0              Normal
  10/28/2026 05 PM PDT           32.23            968         0              Normal
  10/28/2026 06 PM PDT           32.22            964         -              Normal
  10/28/2026 07 PM PDT           32.22            964         0              Normal
  10/28/2026 08 PM PDT           32.22            964         0              Normal
  10/28/2026 09 PM PDT           32.22            964         0              Normal
  10/28/2026 10 PM PDT           32.21            961         -              Normal
  10/28/2026 11 PM PDT           32.21            961         0              Normal
  10/29/2026 12 AM PDT           32.21            961         0              Normal
  10/29/2026 01 AM PDT           32.21            961         0              Normal
  10/29/2026 02 AM PDT           32.21            961         0              Normal
  10/29/2026 03 AM PDT           32.20            957         -              Normal
  10/29/2026 04 AM PDT           32.20            957         0              Normal
  10/29/2026 05 AM PDT           32.20            957         0              Normal
#
# NOTE 1: Stages are rounded to the nearest hundredth (.01) of a foot.
# NOTE 2: Flows are rounded to the nearest (1) cfs.
# NOTE 3: Trends are determined using hourly change in unrounded stage and flow.
# NOTE 4: Maximum Values are determined using unrounded stage and flow.