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 - VERNALIS (VNSC1)
Latitude: 37.68º NLongitude: 121.27º WElevation: 35 FeetForecast Type: Official Location
Location: San Joaquin County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Apr 12 2026 at 8:57 AM PDTNext Issuance: Apr 13 2026 at 9:00 AM PDT
Action/Monitor: 24.5 FeetMinor Flood: 29.0 FeetModerate Flood: 32.0 FeetMajor Flood: 37.3 Feet


# Tabular Observed and Forecast Hydrograph Information
#
# Location: San Joaquin River - Vernalis (VNSC1)
#
# File Generation Time:  04/12/2026 at 08:57 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/12/2026 at 08:00 AM PDT
# Maximum Observed Stage:                       10.42 Feet
# Maximum Observed Flow:                        2711 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/12/2026 at 10:00 PM PDT
# Maximum Forecast Stage:                       10.46 Feet
# Maximum Forecast Flow:                        2744 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/07/2026 08 AM PDT            9.97           2349                        Normal
  04/07/2026 09 AM PDT            9.94           2326         -              Normal
  04/07/2026 10 AM PDT            9.93           2318         -              Normal
  04/07/2026 11 AM PDT            9.92           2310         -              Normal
  04/07/2026 12 PM PDT            9.91           2302         -              Normal
  04/07/2026 01 PM PDT            9.90           2295         -              Normal
  04/07/2026 02 PM PDT            9.90           2295         0              Normal
  04/07/2026 03 PM PDT            9.89           2287         -              Normal
  04/07/2026 04 PM PDT            9.88           2279         -              Normal
  04/07/2026 05 PM PDT            9.87           2272         -              Normal
  04/07/2026 06 PM PDT            9.88           2279         +              Normal
  04/07/2026 07 PM PDT            9.90           2295         +              Normal
  04/07/2026 08 PM PDT            9.91           2302         +              Normal
  04/07/2026 09 PM PDT            9.91           2302         0              Normal
  04/07/2026 10 PM PDT            9.90           2295         -              Normal
  04/07/2026 11 PM PDT            9.90           2295         0              Normal
  04/08/2026 12 AM PDT            9.90           2295         0              Normal
  04/08/2026 01 AM PDT            9.89           2287         -              Normal
  04/08/2026 02 AM PDT            9.89           2287         0              Normal
  04/08/2026 03 AM PDT            9.89           2287         0              Normal
  04/08/2026 04 AM PDT            9.88           2279         -              Normal
  04/08/2026 05 AM PDT            9.88           2279         0              Normal
  04/08/2026 06 AM PDT            9.87           2272         -              Normal
  04/08/2026 07 AM PDT            9.86           2264         -              Normal
  04/08/2026 08 AM PDT            9.86           2264         0              Normal
  04/08/2026 09 AM PDT            9.87           2272         +              Normal
  04/08/2026 10 AM PDT            9.87           2272         0              Normal
  04/08/2026 11 AM PDT            9.84           2249         -              Normal
  04/08/2026 12 PM PDT            9.85           2256         +              Normal
  04/08/2026 01 PM PDT            9.85           2256         0              Normal
  04/08/2026 02 PM PDT            9.85           2256         0              Normal
  04/08/2026 03 PM PDT            9.84           2249         -              Normal
  04/08/2026 04 PM PDT            9.84           2249         0              Normal
  04/08/2026 05 PM PDT            9.83           2241         -              Normal
  04/08/2026 06 PM PDT            9.83           2241         0              Normal
  04/08/2026 07 PM PDT            9.83           2241         0              Normal
  04/08/2026 08 PM PDT            9.83           2241         0              Normal
  04/08/2026 09 PM PDT            9.83           2241         0              Normal
  04/08/2026 10 PM PDT            9.82           2233         -              Normal
  04/08/2026 11 PM PDT            9.82           2233         0              Normal
  04/09/2026 12 AM PDT            9.84           2249         +              Normal
  04/09/2026 01 AM PDT            9.83           2241         -              Normal
  04/09/2026 02 AM PDT            9.82           2233         -              Normal
  04/09/2026 03 AM PDT            9.83           2241         +              Normal
  04/09/2026 04 AM PDT            9.85           2256         +              Normal
  04/09/2026 05 AM PDT            9.85           2256         0              Normal
  04/09/2026 06 AM PDT            9.84           2249         -              Normal
  04/09/2026 07 AM PDT            9.83           2241         -              Normal
  04/09/2026 08 AM PDT            9.84           2249         +              Normal
  04/09/2026 09 AM PDT            9.83           2241         -              Normal
  04/09/2026 10 AM PDT            9.81           2226         -              Normal
  04/09/2026 11 AM PDT            9.83           2241         +              Normal
  04/09/2026 12 PM PDT            9.84           2249         +              Normal
  04/09/2026 01 PM PDT            9.83           2241         -              Normal
  04/09/2026 02 PM PDT            9.85           2256         +              Normal
  04/09/2026 03 PM PDT            9.84           2249         -              Normal
  04/09/2026 04 PM PDT            9.84           2249         0              Normal
  04/09/2026 05 PM PDT            9.83           2241         -              Normal
  04/09/2026 06 PM PDT            9.79           2210         -              Normal
  04/09/2026 07 PM PDT            9.77           2195         -              Normal
  04/09/2026 08 PM PDT            9.76           2188         -              Normal
  04/09/2026 09 PM PDT            9.78           2203         +              Normal
  04/09/2026 10 PM PDT            9.79           2210         +              Normal
  04/09/2026 11 PM PDT            9.79           2210         0              Normal
  04/10/2026 12 AM PDT            9.79           2210         0              Normal
  04/10/2026 01 AM PDT            9.78           2203         -              Normal
  04/10/2026 02 AM PDT            9.81           2226         +              Normal
  04/10/2026 03 AM PDT            9.81           2226         0              Normal
  04/10/2026 04 AM PDT            9.81           2226         0              Normal
  04/10/2026 05 AM PDT            9.82           2233         +              Normal
  04/10/2026 06 AM PDT            9.81           2226         -              Normal
  04/10/2026 07 AM PDT            9.82           2233         +              Normal
  04/10/2026 08 AM PDT            9.82           2233         0              Normal
  04/10/2026 09 AM PDT            9.84           2249         +              Normal
  04/10/2026 10 AM PDT            9.83           2241         -              Normal
  04/10/2026 11 AM PDT            9.85           2256         +              Normal
  04/10/2026 12 PM PDT            9.86           2264         +              Normal
  04/10/2026 01 PM PDT            9.89           2287         +              Normal
  04/10/2026 02 PM PDT            9.91           2302         +              Normal
  04/10/2026 03 PM PDT            9.92           2310         +              Normal
  04/10/2026 04 PM PDT            9.94           2326         +              Normal
  04/10/2026 05 PM PDT            9.94           2326         0              Normal
  04/10/2026 06 PM PDT            9.95           2333         +              Normal
  04/10/2026 07 PM PDT            9.93           2318         -              Normal
  04/10/2026 08 PM PDT            9.99           2365         +              Normal
  04/10/2026 09 PM PDT            9.99           2365         0              Normal
  04/10/2026 10 PM PDT            9.99           2365         0              Normal
  04/10/2026 11 PM PDT           10.00           2373         +              Normal
  04/11/2026 12 AM PDT           10.00           2373         0              Normal
  04/11/2026 01 AM PDT           10.01           2380         +              Normal
  04/11/2026 02 AM PDT           10.01           2380         0              Normal
  04/11/2026 03 AM PDT           10.02           2388         +              Normal
  04/11/2026 04 AM PDT           10.03           2396         +              Normal
  04/11/2026 05 AM PDT           10.04           2404         +              Normal
  04/11/2026 06 AM PDT           10.04           2404         0              Normal
  04/11/2026 07 AM PDT           10.05           2412         +              Normal
  04/11/2026 08 AM PDT           10.07           2428         +              Normal
  04/11/2026 09 AM PDT           10.08           2436         +              Normal
  04/11/2026 10 AM PDT           10.10           2451         +              Normal
  04/11/2026 11 AM PDT           10.10           2451         0              Normal
  04/11/2026 12 PM PDT           10.13           2475         +              Normal
  04/11/2026 01 PM PDT           10.15           2491         +              Normal
  04/11/2026 02 PM PDT           10.17           2507         +              Normal
  04/11/2026 03 PM PDT           10.21           2539         +              Normal
  04/11/2026 04 PM PDT           10.21           2539         0              Normal
  04/11/2026 05 PM PDT           10.25           2572         +              Normal
  04/11/2026 06 PM PDT           10.23           2556         -              Normal
  04/11/2026 07 PM PDT           10.26           2580         +              Normal
  04/11/2026 08 PM PDT           10.29           2604         +              Normal
  04/11/2026 09 PM PDT           10.32           2629         +              Normal
  04/11/2026 10 PM PDT           10.33           2637         +              Normal
  04/11/2026 11 PM PDT           10.34           2645         +              Normal
  04/12/2026 12 AM PDT           10.35           2653         +              Normal
  04/12/2026 01 AM PDT           10.36           2662         +              Normal
  04/12/2026 02 AM PDT           10.36           2662         0              Normal
  04/12/2026 03 AM PDT           10.37           2670         +              Normal
  04/12/2026 04 AM PDT           10.39           2686         +              Normal
  04/12/2026 05 AM PDT           10.39           2686         0              Normal
  04/12/2026 06 AM PDT           10.41           2703         +              Normal
  04/12/2026 07 AM PDT           10.41           2703         0              Normal
  04/12/2026 08 AM PDT           10.42           2711         +              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/12/2026 09 AM PDT           10.42           2711                        Normal
  04/12/2026 10 AM PDT           10.43           2719         +              Normal
  04/12/2026 11 AM PDT           10.43           2719         0              Normal
  04/12/2026 12 PM PDT           10.43           2719         0              Normal
  04/12/2026 01 PM PDT           10.44           2728         +              Normal
  04/12/2026 02 PM PDT           10.44           2728         0              Normal
  04/12/2026 03 PM PDT           10.44           2728         0              Normal
  04/12/2026 04 PM PDT           10.44           2728         0              Normal
  04/12/2026 05 PM PDT           10.45           2736         +              Normal
  04/12/2026 06 PM PDT           10.45           2736         0              Normal
  04/12/2026 07 PM PDT           10.45           2736         0              Normal
  04/12/2026 08 PM PDT           10.45           2736         0              Normal
  04/12/2026 09 PM PDT           10.45           2736         0              Normal
  04/12/2026 10 PM PDT           10.46           2744         +              Normal
  04/12/2026 11 PM PDT           10.46           2744         0              Normal
  04/13/2026 12 AM PDT           10.46           2744         0              Normal
  04/13/2026 01 AM PDT           10.46           2744         0              Normal
  04/13/2026 02 AM PDT           10.46           2744         0              Normal
  04/13/2026 03 AM PDT           10.45           2736         -              Normal
  04/13/2026 04 AM PDT           10.45           2736         0              Normal
  04/13/2026 05 AM PDT           10.45           2736         0              Normal
  04/13/2026 06 AM PDT           10.44           2728         -              Normal
  04/13/2026 07 AM PDT           10.44           2728         0              Normal
  04/13/2026 08 AM PDT           10.43           2719         -              Normal
  04/13/2026 09 AM PDT           10.42           2711         -              Normal
  04/13/2026 10 AM PDT           10.42           2711         0              Normal
  04/13/2026 11 AM PDT           10.41           2703         -              Normal
  04/13/2026 12 PM PDT           10.40           2695         -              Normal
  04/13/2026 01 PM PDT           10.39           2686         -              Normal
  04/13/2026 02 PM PDT           10.38           2678         -              Normal
  04/13/2026 03 PM PDT           10.38           2678         0              Normal
  04/13/2026 04 PM PDT           10.37           2670         -              Normal
  04/13/2026 05 PM PDT           10.36           2662         -              Normal
  04/13/2026 06 PM PDT           10.35           2653         -              Normal
  04/13/2026 07 PM PDT           10.34           2645         -              Normal
  04/13/2026 08 PM PDT           10.34           2645         0              Normal
  04/13/2026 09 PM PDT           10.33           2637         -              Normal
  04/13/2026 10 PM PDT           10.32           2629         -              Normal
  04/13/2026 11 PM PDT           10.31           2621         -              Normal
  04/14/2026 12 AM PDT           10.30           2612         -              Normal
  04/14/2026 01 AM PDT           10.30           2612         0              Normal
  04/14/2026 02 AM PDT           10.29           2604         -              Normal
  04/14/2026 03 AM PDT           10.28           2596         -              Normal
  04/14/2026 04 AM PDT           10.28           2596         0              Normal
  04/14/2026 05 AM PDT           10.27           2588         -              Normal
  04/14/2026 06 AM PDT           10.27           2588         0              Normal
  04/14/2026 07 AM PDT           10.26           2580         -              Normal
  04/14/2026 08 AM PDT           10.25           2572         -              Normal
  04/14/2026 09 AM PDT           10.25           2572         0              Normal
  04/14/2026 10 AM PDT           10.24           2564         -              Normal
  04/14/2026 11 AM PDT           10.24           2564         0              Normal
  04/14/2026 12 PM PDT           10.23           2556         -              Normal
  04/14/2026 01 PM PDT           10.23           2556         0              Normal
  04/14/2026 02 PM PDT           10.23           2556         0              Normal
  04/14/2026 03 PM PDT           10.22           2547         -              Normal
  04/14/2026 04 PM PDT           10.22           2547         0              Normal
  04/14/2026 05 PM PDT           10.21           2539         -              Normal
  04/14/2026 06 PM PDT           10.21           2539         0              Normal
  04/14/2026 07 PM PDT           10.21           2539         0              Normal
  04/14/2026 08 PM PDT           10.20           2531         -              Normal
  04/14/2026 09 PM PDT           10.20           2531         0              Normal
  04/14/2026 10 PM PDT           10.20           2531         0              Normal
  04/14/2026 11 PM PDT           10.20           2531         0              Normal
  04/15/2026 12 AM PDT           10.20           2531         0              Normal
  04/15/2026 01 AM PDT           10.19           2523         -              Normal
  04/15/2026 02 AM PDT           10.19           2523         0              Normal
  04/15/2026 03 AM PDT           10.19           2523         0              Normal
  04/15/2026 04 AM PDT           10.19           2523         0              Normal
  04/15/2026 05 AM PDT           10.19           2523         0              Normal
  04/15/2026 06 AM PDT           10.20           2531         +              Normal
  04/15/2026 07 AM PDT           10.20           2531         0              Normal
  04/15/2026 08 AM PDT           10.20           2531         0              Normal
  04/15/2026 09 AM PDT           10.20           2531         0              Normal
  04/15/2026 10 AM PDT           10.20           2531         0              Normal
  04/15/2026 11 AM PDT           10.20           2531         0              Normal
  04/15/2026 12 PM PDT           10.20           2531         0              Normal
  04/15/2026 01 PM PDT           10.21           2539         +              Normal
  04/15/2026 02 PM PDT           10.21           2539         0              Normal
  04/15/2026 03 PM PDT           10.21           2539         0              Normal
  04/15/2026 04 PM PDT           10.21           2539         0              Normal
  04/15/2026 05 PM PDT           10.21           2539         0              Normal
  04/15/2026 06 PM PDT           10.21           2539         0              Normal
  04/15/2026 07 PM PDT           10.21           2539         0              Normal
  04/15/2026 08 PM PDT           10.22           2547         +              Normal
  04/15/2026 09 PM PDT           10.22           2547         0              Normal
  04/15/2026 10 PM PDT           10.22           2547         0              Normal
  04/15/2026 11 PM PDT           10.22           2547         0              Normal
  04/16/2026 12 AM PDT           10.23           2556         +              Normal
  04/16/2026 01 AM PDT           10.23           2556         0              Normal
  04/16/2026 02 AM PDT           10.23           2556         0              Normal
  04/16/2026 03 AM PDT           10.24           2564         +              Normal
  04/16/2026 04 AM PDT           10.24           2564         0              Normal
  04/16/2026 05 AM PDT           10.25           2572         +              Normal
  04/16/2026 06 AM PDT           10.26           2580         +              Normal
  04/16/2026 07 AM PDT           10.26           2580         0              Normal
  04/16/2026 08 AM PDT           10.27           2588         +              Normal
  04/16/2026 09 AM PDT           10.28           2596         +              Normal
  04/16/2026 10 AM PDT           10.28           2596         0              Normal
  04/16/2026 11 AM PDT           10.29           2604         +              Normal
  04/16/2026 12 PM PDT           10.30           2612         +              Normal
  04/16/2026 01 PM PDT           10.30           2612         0              Normal
  04/16/2026 02 PM PDT           10.31           2621         +              Normal
  04/16/2026 03 PM PDT           10.32           2629         +              Normal
  04/16/2026 04 PM PDT           10.33           2637         +              Normal
  04/16/2026 05 PM PDT           10.33           2637         0              Normal
  04/16/2026 06 PM PDT           10.34           2645         +              Normal
  04/16/2026 07 PM PDT           10.35           2653         +              Normal
  04/16/2026 08 PM PDT           10.35           2653         0              Normal
  04/16/2026 09 PM PDT           10.36           2662         +              Normal
  04/16/2026 10 PM PDT           10.36           2662         0              Normal
  04/16/2026 11 PM PDT           10.36           2662         0              Normal
  04/17/2026 12 AM PDT           10.36           2662         0              Normal
  04/17/2026 01 AM PDT           10.36           2662         0              Normal
  04/17/2026 02 AM PDT           10.36           2662         0              Normal
  04/17/2026 03 AM PDT           10.36           2662         0              Normal
  04/17/2026 04 AM PDT           10.35           2653         -              Normal
  04/17/2026 05 AM PDT           10.35           2653         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.