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: May 05 2026 at 7:46 AM PDTNext Issuance: May 06 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:  05/05/2026 at 07:46 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/30/2026 at 07:00 AM PDT
# Maximum Observed Stage:                       10.78 Feet
# Maximum Observed Flow:                        3017 cfs
#
# Earliest Date & Time of Maximum Forecast:     05/05/2026 at 08:00 AM PDT
# Maximum Forecast Stage:                       9.38 Feet
# Maximum Forecast Flow:                        1908 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/30/2026 07 AM PDT           10.78           3017                        Normal
  04/30/2026 08 AM PDT           10.77           3008         -              Normal
  04/30/2026 09 AM PDT           10.76           2999         -              Normal
  04/30/2026 10 AM PDT           10.75           2991         -              Normal
  04/30/2026 11 AM PDT           10.75           2991         0              Normal
  04/30/2026 12 PM PDT           10.74           2982         -              Normal
  04/30/2026 01 PM PDT           10.72           2965         -              Normal
  04/30/2026 02 PM PDT           10.71           2956         -              Normal
  04/30/2026 03 PM PDT           10.68           2930         -              Normal
  04/30/2026 04 PM PDT           10.64           2896         -              Normal
  04/30/2026 05 PM PDT           10.62           2879         -              Normal
  04/30/2026 06 PM PDT           10.60           2862         -              Normal
  04/30/2026 07 PM PDT           10.60           2862         0              Normal
  04/30/2026 08 PM PDT           10.61           2871         +              Normal
  04/30/2026 09 PM PDT           10.59           2854         -              Normal
  04/30/2026 10 PM PDT           10.58           2845         -              Normal
  04/30/2026 11 PM PDT           10.56           2828         -              Normal
  05/01/2026 12 AM PDT           10.56           2828         0              Normal
  05/01/2026 01 AM PDT           10.55           2820         -              Normal
  05/01/2026 02 AM PDT           10.54           2811         -              Normal
  05/01/2026 03 AM PDT           10.53           2803         -              Normal
  05/01/2026 04 AM PDT           10.52           2795         -              Normal
  05/01/2026 05 AM PDT           10.51           2786         -              Normal
  05/01/2026 06 AM PDT           10.50           2778         -              Normal
  05/01/2026 07 AM PDT           10.49           2769         -              Normal
  05/01/2026 08 AM PDT           10.48           2761         -              Normal
  05/01/2026 09 AM PDT           10.47           2753         -              Normal
  05/01/2026 10 AM PDT           10.45           2736         -              Normal
  05/01/2026 11 AM PDT           10.43           2719         -              Normal
  05/01/2026 12 PM PDT           10.41           2703         -              Normal
  05/01/2026 01 PM PDT           10.40           2695         -              Normal
  05/01/2026 02 PM PDT           10.37           2670         -              Normal
  05/01/2026 03 PM PDT           10.34           2645         -              Normal
  05/01/2026 04 PM PDT           10.32           2629         -              Normal
  05/01/2026 05 PM PDT           10.29           2604         -              Normal
  05/01/2026 06 PM PDT           10.27           2588         -              Normal
  05/01/2026 07 PM PDT           10.25           2572         -              Normal
  05/01/2026 08 PM PDT           10.26           2580         +              Normal
  05/01/2026 09 PM PDT           10.22           2547         -              Normal
  05/01/2026 10 PM PDT           10.22           2547         0              Normal
  05/01/2026 11 PM PDT           10.21           2539         -              Normal
  05/02/2026 12 AM PDT           10.21           2539         0              Normal
  05/02/2026 01 AM PDT           10.20           2531         -              Normal
  05/02/2026 02 AM PDT           10.19           2523         -              Normal
  05/02/2026 03 AM PDT           10.18           2515         -              Normal
  05/02/2026 04 AM PDT           10.18           2515         0              Normal
  05/02/2026 05 AM PDT           10.17           2507         -              Normal
  05/02/2026 06 AM PDT           10.15           2491         -              Normal
  05/02/2026 07 AM PDT           10.15           2491         0              Normal
  05/02/2026 08 AM PDT           10.13           2475         -              Normal
  05/02/2026 09 AM PDT           10.13           2475         0              Normal
  05/02/2026 10 AM PDT           10.11           2459         -              Normal
  05/02/2026 11 AM PDT           10.10           2451         -              Normal
  05/02/2026 12 PM PDT           10.08           2436         -              Normal
  05/02/2026 01 PM PDT           10.06           2420         -              Normal
  05/02/2026 02 PM PDT           10.05           2412         -              Normal
  05/02/2026 03 PM PDT           10.03           2396         -              Normal
  05/02/2026 04 PM PDT           10.01           2380         -              Normal
  05/02/2026 05 PM PDT            9.99           2365         -              Normal
  05/02/2026 06 PM PDT            9.98           2357         -              Normal
  05/02/2026 07 PM PDT            9.95           2333         -              Normal
  05/02/2026 08 PM PDT            9.95           2333         0              Normal
  05/02/2026 09 PM PDT            9.93           2318         -              Normal
  05/02/2026 10 PM PDT            9.91           2302         -              Normal
  05/02/2026 11 PM PDT            9.91           2302         0              Normal
  05/03/2026 12 AM PDT            9.91           2302         0              Normal
  05/03/2026 01 AM PDT            9.91           2302         0              Normal
  05/03/2026 02 AM PDT            9.91           2302         0              Normal
  05/03/2026 03 AM PDT            9.92           2310         +              Normal
  05/03/2026 04 AM PDT            9.92           2310         0              Normal
  05/03/2026 05 AM PDT            9.91           2302         -              Normal
  05/03/2026 06 AM PDT            9.91           2302         0              Normal
  05/03/2026 07 AM PDT            9.90           2295         -              Normal
  05/03/2026 08 AM PDT            9.89           2287         -              Normal
  05/03/2026 09 AM PDT            9.88           2279         -              Normal
  05/03/2026 10 AM PDT            9.87           2272         -              Normal
  05/03/2026 11 AM PDT            9.88           2279         +              Normal
  05/03/2026 12 PM PDT            9.88           2279         0              Normal
  05/03/2026 01 PM PDT            9.88           2279         0              Normal
  05/03/2026 02 PM PDT            9.85           2256         -              Normal
  05/03/2026 03 PM PDT            9.84           2249         -              Normal
  05/03/2026 04 PM PDT            9.84           2249         0              Normal
  05/03/2026 05 PM PDT            9.83           2241         -              Normal
  05/03/2026 06 PM PDT            9.80           2218         -              Normal
  05/03/2026 07 PM PDT            9.80           2218         0              Normal
  05/03/2026 08 PM PDT            9.80           2218         0              Normal
  05/03/2026 09 PM PDT            9.80           2218         0              Normal
  05/03/2026 10 PM PDT            9.78           2203         -              Normal
  05/03/2026 11 PM PDT            9.80           2218         +              Normal
  05/04/2026 12 AM PDT            9.78           2203         -              Normal
  05/04/2026 01 AM PDT            9.78           2203         0              Normal
  05/04/2026 02 AM PDT            9.77           2195         -              Normal
  05/04/2026 03 AM PDT            9.79           2210         +              Normal
  05/04/2026 04 AM PDT            9.79           2210         0              Normal
  05/04/2026 05 AM PDT            9.78           2203         -              Normal
  05/04/2026 06 AM PDT            9.78           2203         0              Normal
  05/04/2026 07 AM PDT            9.77           2195         -              Normal
  05/04/2026 08 AM PDT            9.77           2195         0              Normal
  05/04/2026 09 AM PDT            9.75           2180         -              Normal
  05/04/2026 10 AM PDT            9.72           2158         -              Normal
  05/04/2026 11 AM PDT            9.69           2135         -              Normal
  05/04/2026 12 PM PDT            9.66           2113         -              Normal
  05/04/2026 01 PM PDT            9.63           2090         -              Normal
  05/04/2026 02 PM PDT            9.61           2076         -              Normal
  05/04/2026 03 PM PDT            9.58           2053         -              Normal
  05/04/2026 04 PM PDT            9.55           2031         -              Normal
  05/04/2026 05 PM PDT            9.53           2017         -              Normal
  05/04/2026 06 PM PDT            9.52           2009         -              Normal
  05/04/2026 07 PM PDT            9.50           1995         -              Normal
  05/04/2026 08 PM PDT            9.49           1988         -              Normal
  05/04/2026 09 PM PDT            9.46           1966         -              Normal
  05/04/2026 10 PM PDT            9.44           1951         -              Normal
  05/04/2026 11 PM PDT            9.45           1959         +              Normal
  05/05/2026 12 AM PDT            9.43           1944         -              Normal
  05/05/2026 01 AM PDT            9.42           1937         -              Normal
  05/05/2026 02 AM PDT            9.43           1944         +              Normal
  05/05/2026 03 AM PDT            9.42           1937         -              Normal
  05/05/2026 04 AM PDT            9.41           1930         -              Normal
  05/05/2026 05 AM PDT            9.40           1923         -              Normal
  05/05/2026 06 AM PDT            9.39           1916         -              Normal
  05/05/2026 07 AM PDT            9.39           1916         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  05/05/2026 08 AM PDT            9.38           1908                        Normal
  05/05/2026 09 AM PDT            9.37           1901         -              Normal
  05/05/2026 10 AM PDT            9.36           1894         -              Normal
  05/05/2026 11 AM PDT            9.36           1894         0              Normal
  05/05/2026 12 PM PDT            9.35           1887         -              Normal
  05/05/2026 01 PM PDT            9.34           1880         -              Normal
  05/05/2026 02 PM PDT            9.33           1873         -              Normal
  05/05/2026 03 PM PDT            9.32           1866         -              Normal
  05/05/2026 04 PM PDT            9.31           1859         -              Normal
  05/05/2026 05 PM PDT            9.31           1859         0              Normal
  05/05/2026 06 PM PDT            9.30           1852         -              Normal
  05/05/2026 07 PM PDT            9.29           1845         -              Normal
  05/05/2026 08 PM PDT            9.28           1838         -              Normal
  05/05/2026 09 PM PDT            9.28           1838         0              Normal
  05/05/2026 10 PM PDT            9.27           1831         -              Normal
  05/05/2026 11 PM PDT            9.26           1824         -              Normal
  05/06/2026 12 AM PDT            9.26           1824         0              Normal
  05/06/2026 01 AM PDT            9.25           1817         -              Normal
  05/06/2026 02 AM PDT            9.24           1810         -              Normal
  05/06/2026 03 AM PDT            9.23           1803         -              Normal
  05/06/2026 04 AM PDT            9.22           1796         -              Normal
  05/06/2026 05 AM PDT            9.21           1789         -              Normal
  05/06/2026 06 AM PDT            9.20           1782         -              Normal
  05/06/2026 07 AM PDT            9.19           1775         -              Normal
  05/06/2026 08 AM PDT            9.18           1768         -              Normal
  05/06/2026 09 AM PDT            9.17           1761         -              Normal
  05/06/2026 10 AM PDT            9.16           1754         -              Normal
  05/06/2026 11 AM PDT            9.14           1740         -              Normal
  05/06/2026 12 PM PDT            9.13           1734         -              Normal
  05/06/2026 01 PM PDT            9.12           1727         -              Normal
  05/06/2026 02 PM PDT            9.11           1720         -              Normal
  05/06/2026 03 PM PDT            9.10           1713         -              Normal
  05/06/2026 04 PM PDT            9.09           1706         -              Normal
  05/06/2026 05 PM PDT            9.08           1700         -              Normal
  05/06/2026 06 PM PDT            9.06           1686         -              Normal
  05/06/2026 07 PM PDT            9.05           1679         -              Normal
  05/06/2026 08 PM PDT            9.04           1672         -              Normal
  05/06/2026 09 PM PDT            9.03           1666         -              Normal
  05/06/2026 10 PM PDT            9.02           1659         -              Normal
  05/06/2026 11 PM PDT            9.01           1652         -              Normal
  05/07/2026 12 AM PDT            9.00           1646         -              Normal
  05/07/2026 01 AM PDT            8.99           1639         -              Normal
  05/07/2026 02 AM PDT            8.98           1632         -              Normal
  05/07/2026 03 AM PDT            8.98           1632         0              Normal
  05/07/2026 04 AM PDT            8.97           1626         -              Normal
  05/07/2026 05 AM PDT            8.96           1619         -              Normal
  05/07/2026 06 AM PDT            8.95           1612         -              Normal
  05/07/2026 07 AM PDT            8.94           1606         -              Normal
  05/07/2026 08 AM PDT            8.93           1599         -              Normal
  05/07/2026 09 AM PDT            8.93           1599         0              Normal
  05/07/2026 10 AM PDT            8.92           1592         -              Normal
  05/07/2026 11 AM PDT            8.91           1586         -              Normal
  05/07/2026 12 PM PDT            8.90           1579         -              Normal
  05/07/2026 01 PM PDT            8.90           1579         0              Normal
  05/07/2026 02 PM PDT            8.89           1573         -              Normal
  05/07/2026 03 PM PDT            8.88           1566         -              Normal
  05/07/2026 04 PM PDT            8.88           1566         0              Normal
  05/07/2026 05 PM PDT            8.87           1560         -              Normal
  05/07/2026 06 PM PDT            8.87           1560         0              Normal
  05/07/2026 07 PM PDT            8.86           1553         -              Normal
  05/07/2026 08 PM PDT            8.86           1553         0              Normal
  05/07/2026 09 PM PDT            8.85           1546         -              Normal
  05/07/2026 10 PM PDT            8.85           1546         0              Normal
  05/07/2026 11 PM PDT            8.84           1540         -              Normal
  05/08/2026 12 AM PDT            8.84           1540         0              Normal
  05/08/2026 01 AM PDT            8.84           1540         0              Normal
  05/08/2026 02 AM PDT            8.83           1533         -              Normal
  05/08/2026 03 AM PDT            8.83           1533         0              Normal
  05/08/2026 04 AM PDT            8.82           1527         -              Normal
  05/08/2026 05 AM PDT            8.82           1527         0              Normal
  05/08/2026 06 AM PDT            8.81           1520         -              Normal
  05/08/2026 07 AM PDT            8.81           1520         0              Normal
  05/08/2026 08 AM PDT            8.81           1520         0              Normal
  05/08/2026 09 AM PDT            8.80           1514         -              Normal
  05/08/2026 10 AM PDT            8.80           1514         0              Normal
  05/08/2026 11 AM PDT            8.80           1514         0              Normal
  05/08/2026 12 PM PDT            8.79           1508         -              Normal
  05/08/2026 01 PM PDT            8.79           1508         0              Normal
  05/08/2026 02 PM PDT            8.79           1508         0              Normal
  05/08/2026 03 PM PDT            8.79           1508         0              Normal
  05/08/2026 04 PM PDT            8.78           1501         -              Normal
  05/08/2026 05 PM PDT            8.78           1501         0              Normal
  05/08/2026 06 PM PDT            8.78           1501         0              Normal
  05/08/2026 07 PM PDT            8.78           1501         0              Normal
  05/08/2026 08 PM PDT            8.77           1495         -              Normal
  05/08/2026 09 PM PDT            8.77           1495         0              Normal
  05/08/2026 10 PM PDT            8.77           1495         0              Normal
  05/08/2026 11 PM PDT            8.77           1495         0              Normal
  05/09/2026 12 AM PDT            8.77           1495         0              Normal
  05/09/2026 01 AM PDT            8.76           1488         -              Normal
  05/09/2026 02 AM PDT            8.76           1488         0              Normal
  05/09/2026 03 AM PDT            8.76           1488         0              Normal
  05/09/2026 04 AM PDT            8.76           1488         0              Normal
  05/09/2026 05 AM PDT            8.75           1482         -              Normal
  05/09/2026 06 AM PDT            8.75           1482         0              Normal
  05/09/2026 07 AM PDT            8.75           1482         0              Normal
  05/09/2026 08 AM PDT            8.75           1482         0              Normal
  05/09/2026 09 AM PDT            8.74           1475         -              Normal
  05/09/2026 10 AM PDT            8.74           1475         0              Normal
  05/09/2026 11 AM PDT            8.74           1475         0              Normal
  05/09/2026 12 PM PDT            8.74           1475         0              Normal
  05/09/2026 01 PM PDT            8.73           1469         -              Normal
  05/09/2026 02 PM PDT            8.73           1469         0              Normal
  05/09/2026 03 PM PDT            8.73           1469         0              Normal
  05/09/2026 04 PM PDT            8.73           1469         0              Normal
  05/09/2026 05 PM PDT            8.73           1469         0              Normal
  05/09/2026 06 PM PDT            8.73           1469         0              Normal
  05/09/2026 07 PM PDT            8.72           1463         -              Normal
  05/09/2026 08 PM PDT            8.72           1463         0              Normal
  05/09/2026 09 PM PDT            8.72           1463         0              Normal
  05/09/2026 10 PM PDT            8.72           1463         0              Normal
  05/09/2026 11 PM PDT            8.72           1463         0              Normal
  05/10/2026 12 AM PDT            8.72           1463         0              Normal
  05/10/2026 01 AM PDT            8.72           1463         0              Normal
  05/10/2026 02 AM PDT            8.71           1456         -              Normal
  05/10/2026 03 AM PDT            8.71           1456         0              Normal
  05/10/2026 04 AM PDT            8.71           1456         0              Normal
  05/10/2026 05 AM PDT            8.71           1456         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.