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 20 2026 at 7:52 AM PDTNext Issuance: Apr 21 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:  04/20/2026 at 07:52 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  04/20/2026 at 07:00 AM PDT
# Maximum Observed Stage:                       10.37 Feet
# Maximum Observed Flow:                        2670 cfs
#
# Earliest Date & Time of Maximum Forecast:     04/23/2026 at 06:00 AM PDT
# Maximum Forecast Stage:                       10.96 Feet
# Maximum Forecast Flow:                        3175 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  04/15/2026 07 AM PDT            9.85           2256                        Normal
  04/15/2026 08 AM PDT            9.85           2256         0              Normal
  04/15/2026 09 AM PDT            9.84           2249         -              Normal
  04/15/2026 10 AM PDT            9.85           2256         +              Normal
  04/15/2026 11 AM PDT            9.84           2249         -              Normal
  04/15/2026 12 PM PDT            9.87           2272         +              Normal
  04/15/2026 01 PM PDT            9.89           2287         +              Normal
  04/15/2026 02 PM PDT            9.89           2287         0              Normal
  04/15/2026 03 PM PDT            9.91           2302         +              Normal
  04/15/2026 04 PM PDT            9.89           2287         -              Normal
  04/15/2026 05 PM PDT            9.91           2302         +              Normal
  04/15/2026 06 PM PDT            9.91           2302         0              Normal
  04/15/2026 07 PM PDT            9.94           2326         +              Normal
  04/15/2026 08 PM PDT            9.96           2341         +              Normal
  04/15/2026 09 PM PDT            9.98           2357         +              Normal
  04/15/2026 10 PM PDT           10.00           2373         +              Normal
  04/15/2026 11 PM PDT           10.00           2373         0              Normal
  04/16/2026 12 AM PDT           10.00           2373         0              Normal
  04/16/2026 01 AM PDT           10.00           2373         0              Normal
  04/16/2026 02 AM PDT           10.01           2380         +              Normal
  04/16/2026 03 AM PDT           10.01           2380         0              Normal
  04/16/2026 04 AM PDT           10.01           2380         0              Normal
  04/16/2026 05 AM PDT            9.99           2365         -              Normal
  04/16/2026 06 AM PDT            9.98           2357         -              Normal
  04/16/2026 07 AM PDT            9.97           2349         -              Normal
  04/16/2026 08 AM PDT            9.95           2333         -              Normal
  04/16/2026 09 AM PDT            9.93           2318         -              Normal
  04/16/2026 10 AM PDT            9.93           2318         0              Normal
  04/16/2026 11 AM PDT            9.92           2310         -              Normal
  04/16/2026 12 PM PDT            9.89           2287         -              Normal
  04/16/2026 01 PM PDT            9.87           2272         -              Normal
  04/16/2026 02 PM PDT            9.85           2256         -              Normal
  04/16/2026 03 PM PDT            9.84           2249         -              Normal
  04/16/2026 04 PM PDT            9.82           2233         -              Normal
  04/16/2026 05 PM PDT            9.79           2210         -              Normal
  04/16/2026 06 PM PDT            9.77           2195         -              Normal
  04/16/2026 07 PM PDT            9.75           2180         -              Normal
  04/16/2026 08 PM PDT            9.75           2180         0              Normal
  04/16/2026 09 PM PDT            9.72           2158         -              Normal
  04/16/2026 10 PM PDT            9.72           2158         0              Normal
  04/16/2026 11 PM PDT            9.71           2150         -              Normal
  04/17/2026 12 AM PDT            9.70           2143         -              Normal
  04/17/2026 01 AM PDT            9.68           2128         -              Normal
  04/17/2026 02 AM PDT            9.68           2128         0              Normal
  04/17/2026 03 AM PDT            9.66           2113         -              Normal
  04/17/2026 04 AM PDT            9.67           2120         +              Normal
  04/17/2026 05 AM PDT            9.66           2113         -              Normal
  04/17/2026 06 AM PDT            9.67           2120         +              Normal
  04/17/2026 07 AM PDT            9.66           2113         -              Normal
  04/17/2026 08 AM PDT            9.65           2105         -              Normal
  04/17/2026 09 AM PDT            9.63           2090         -              Normal
  04/17/2026 10 AM PDT            9.62           2083         -              Normal
  04/17/2026 11 AM PDT            9.61           2076         -              Normal
  04/17/2026 12 PM PDT            9.61           2076         0              Normal
  04/17/2026 01 PM PDT            9.60           2068         -              Normal
  04/17/2026 02 PM PDT            9.58           2053         -              Normal
  04/17/2026 03 PM PDT            9.57           2046         -              Normal
  04/17/2026 04 PM PDT            9.56           2039         -              Normal
  04/17/2026 05 PM PDT            9.56           2039         0              Normal
  04/17/2026 06 PM PDT            9.54           2024         -              Normal
  04/17/2026 07 PM PDT            9.56           2039         +              Normal
  04/17/2026 08 PM PDT            9.56           2039         0              Normal
  04/17/2026 09 PM PDT            9.56           2039         0              Normal
  04/17/2026 10 PM PDT            9.55           2031         -              Normal
  04/17/2026 11 PM PDT            9.55           2031         0              Normal
  04/18/2026 12 AM PDT            9.56           2039         +              Normal
  04/18/2026 01 AM PDT            9.56           2039         0              Normal
  04/18/2026 02 AM PDT            9.56           2039         0              Normal
  04/18/2026 03 AM PDT            9.57           2046         +              Normal
  04/18/2026 04 AM PDT            9.57           2046         0              Normal
  04/18/2026 05 AM PDT            9.58           2053         +              Normal
  04/18/2026 06 AM PDT            9.59           2061         +              Normal
  04/18/2026 07 AM PDT            9.60           2068         +              Normal
  04/18/2026 08 AM PDT            9.60           2068         0              Normal
  04/18/2026 09 AM PDT            9.61           2076         +              Normal
  04/18/2026 10 AM PDT            9.63           2090         +              Normal
  04/18/2026 11 AM PDT            9.66           2113         +              Normal
  04/18/2026 12 PM PDT            9.68           2128         +              Normal
  04/18/2026 01 PM PDT            9.69           2135         +              Normal
  04/18/2026 02 PM PDT            9.72           2158         +              Normal
  04/18/2026 03 PM PDT            9.74           2173         +              Normal
  04/18/2026 04 PM PDT            9.73           2165         -              Normal
  04/18/2026 05 PM PDT            9.78           2203         +              Normal
  04/18/2026 06 PM PDT            9.80           2218         +              Normal
  04/18/2026 07 PM PDT            9.83           2241         +              Normal
  04/18/2026 08 PM PDT            9.85           2256         +              Normal
  04/18/2026 09 PM PDT            9.87           2272         +              Normal
  04/18/2026 10 PM PDT            9.90           2295         +              Normal
  04/18/2026 11 PM PDT            9.92           2310         +              Normal
  04/19/2026 12 AM PDT            9.94           2326         +              Normal
  04/19/2026 01 AM PDT            9.96           2341         +              Normal
  04/19/2026 02 AM PDT            9.98           2357         +              Normal
  04/19/2026 03 AM PDT           10.00           2373         +              Normal
  04/19/2026 04 AM PDT           10.01           2380         +              Normal
  04/19/2026 05 AM PDT           10.03           2396         +              Normal
  04/19/2026 06 AM PDT           10.04           2404         +              Normal
  04/19/2026 07 AM PDT           10.05           2412         +              Normal
  04/19/2026 08 AM PDT           10.07           2428         +              Normal
  04/19/2026 09 AM PDT           10.09           2443         +              Normal
  04/19/2026 10 AM PDT           10.10           2451         +              Normal
  04/19/2026 11 AM PDT           10.12           2467         +              Normal
  04/19/2026 12 PM PDT           10.15           2491         +              Normal
  04/19/2026 01 PM PDT           10.16           2499         +              Normal
  04/19/2026 02 PM PDT           10.19           2523         +              Normal
  04/19/2026 03 PM PDT           10.18           2515         -              Normal
  04/19/2026 04 PM PDT           10.21           2539         +              Normal
  04/19/2026 05 PM PDT           10.23           2556         +              Normal
  04/19/2026 06 PM PDT           10.23           2556         0              Normal
  04/19/2026 07 PM PDT           10.22           2547         -              Normal
  04/19/2026 08 PM PDT           10.26           2580         +              Normal
  04/19/2026 09 PM PDT           10.27           2588         +              Normal
  04/19/2026 10 PM PDT           10.29           2604         +              Normal
  04/19/2026 11 PM PDT           10.31           2621         +              Normal
  04/20/2026 12 AM PDT           10.33           2637         +              Normal
  04/20/2026 01 AM PDT           10.34           2645         +              Normal
  04/20/2026 02 AM PDT           10.35           2653         +              Normal
  04/20/2026 03 AM PDT           10.35           2653         0              Normal
  04/20/2026 04 AM PDT           10.37           2670         +              Normal
  04/20/2026 05 AM PDT           10.37           2670         0              Normal
  04/20/2026 06 AM PDT           10.37           2670         0              Normal
  04/20/2026 07 AM PDT           10.37           2670         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  04/20/2026 08 AM PDT           10.37           2670                        Normal
  04/20/2026 09 AM PDT           10.37           2670         0              Normal
  04/20/2026 10 AM PDT           10.37           2670         0              Normal
  04/20/2026 11 AM PDT           10.37           2670         0              Normal
  04/20/2026 12 PM PDT           10.36           2662         -              Normal
  04/20/2026 01 PM PDT           10.36           2662         0              Normal
  04/20/2026 02 PM PDT           10.36           2662         0              Normal
  04/20/2026 03 PM PDT           10.36           2662         0              Normal
  04/20/2026 04 PM PDT           10.36           2662         0              Normal
  04/20/2026 05 PM PDT           10.36           2662         0              Normal
  04/20/2026 06 PM PDT           10.36           2662         0              Normal
  04/20/2026 07 PM PDT           10.37           2670         +              Normal
  04/20/2026 08 PM PDT           10.37           2670         0              Normal
  04/20/2026 09 PM PDT           10.38           2678         +              Normal
  04/20/2026 10 PM PDT           10.39           2686         +              Normal
  04/20/2026 11 PM PDT           10.40           2695         +              Normal
  04/21/2026 12 AM PDT           10.41           2703         +              Normal
  04/21/2026 01 AM PDT           10.42           2711         +              Normal
  04/21/2026 02 AM PDT           10.44           2728         +              Normal
  04/21/2026 03 AM PDT           10.45           2736         +              Normal
  04/21/2026 04 AM PDT           10.47           2753         +              Normal
  04/21/2026 05 AM PDT           10.48           2761         +              Normal
  04/21/2026 06 AM PDT           10.50           2778         +              Normal
  04/21/2026 07 AM PDT           10.52           2795         +              Normal
  04/21/2026 08 AM PDT           10.53           2803         +              Normal
  04/21/2026 09 AM PDT           10.55           2820         +              Normal
  04/21/2026 10 AM PDT           10.57           2837         +              Normal
  04/21/2026 11 AM PDT           10.58           2845         +              Normal
  04/21/2026 12 PM PDT           10.60           2862         +              Normal
  04/21/2026 01 PM PDT           10.62           2879         +              Normal
  04/21/2026 02 PM PDT           10.63           2888         +              Normal
  04/21/2026 03 PM PDT           10.65           2905         +              Normal
  04/21/2026 04 PM PDT           10.66           2913         +              Normal
  04/21/2026 05 PM PDT           10.68           2930         +              Normal
  04/21/2026 06 PM PDT           10.69           2939         +              Normal
  04/21/2026 07 PM PDT           10.71           2956         +              Normal
  04/21/2026 08 PM PDT           10.72           2965         +              Normal
  04/21/2026 09 PM PDT           10.73           2973         +              Normal
  04/21/2026 10 PM PDT           10.74           2982         +              Normal
  04/21/2026 11 PM PDT           10.75           2991         +              Normal
  04/22/2026 12 AM PDT           10.76           2999         +              Normal
  04/22/2026 01 AM PDT           10.77           3008         +              Normal
  04/22/2026 02 AM PDT           10.78           3017         +              Normal
  04/22/2026 03 AM PDT           10.79           3025         +              Normal
  04/22/2026 04 AM PDT           10.79           3025         0              Normal
  04/22/2026 05 AM PDT           10.80           3034         +              Normal
  04/22/2026 06 AM PDT           10.80           3034         0              Normal
  04/22/2026 07 AM PDT           10.81           3043         +              Normal
  04/22/2026 08 AM PDT           10.81           3043         0              Normal
  04/22/2026 09 AM PDT           10.82           3052         +              Normal
  04/22/2026 10 AM PDT           10.82           3052         0              Normal
  04/22/2026 11 AM PDT           10.83           3060         +              Normal
  04/22/2026 12 PM PDT           10.84           3069         +              Normal
  04/22/2026 01 PM PDT           10.84           3069         0              Normal
  04/22/2026 02 PM PDT           10.85           3078         +              Normal
  04/22/2026 03 PM PDT           10.85           3078         0              Normal
  04/22/2026 04 PM PDT           10.86           3087         +              Normal
  04/22/2026 05 PM PDT           10.87           3095         +              Normal
  04/22/2026 06 PM PDT           10.87           3095         0              Normal
  04/22/2026 07 PM PDT           10.88           3104         +              Normal
  04/22/2026 08 PM PDT           10.88           3104         0              Normal
  04/22/2026 09 PM PDT           10.89           3113         +              Normal
  04/22/2026 10 PM PDT           10.90           3122         +              Normal
  04/22/2026 11 PM PDT           10.91           3131         +              Normal
  04/23/2026 12 AM PDT           10.92           3139         +              Normal
  04/23/2026 01 AM PDT           10.93           3148         +              Normal
  04/23/2026 02 AM PDT           10.94           3157         +              Normal
  04/23/2026 03 AM PDT           10.94           3157         0              Normal
  04/23/2026 04 AM PDT           10.95           3166         +              Normal
  04/23/2026 05 AM PDT           10.95           3166         0              Normal
  04/23/2026 06 AM PDT           10.96           3175         +              Normal
  04/23/2026 07 AM PDT           10.96           3175         0              Normal
  04/23/2026 08 AM PDT           10.96           3175         0              Normal
  04/23/2026 09 AM PDT           10.96           3175         0              Normal
  04/23/2026 10 AM PDT           10.96           3175         0              Normal
  04/23/2026 11 AM PDT           10.95           3166         -              Normal
  04/23/2026 12 PM PDT           10.95           3166         0              Normal
  04/23/2026 01 PM PDT           10.95           3166         0              Normal
  04/23/2026 02 PM PDT           10.94           3157         -              Normal
  04/23/2026 03 PM PDT           10.94           3157         0              Normal
  04/23/2026 04 PM PDT           10.93           3148         -              Normal
  04/23/2026 05 PM PDT           10.92           3139         -              Normal
  04/23/2026 06 PM PDT           10.92           3139         0              Normal
  04/23/2026 07 PM PDT           10.91           3131         -              Normal
  04/23/2026 08 PM PDT           10.90           3122         -              Normal
  04/23/2026 09 PM PDT           10.90           3122         0              Normal
  04/23/2026 10 PM PDT           10.89           3113         -              Normal
  04/23/2026 11 PM PDT           10.89           3113         0              Normal
  04/24/2026 12 AM PDT           10.89           3113         0              Normal
  04/24/2026 01 AM PDT           10.89           3113         0              Normal
  04/24/2026 02 AM PDT           10.89           3113         0              Normal
  04/24/2026 03 AM PDT           10.89           3113         0              Normal
  04/24/2026 04 AM PDT           10.90           3122         +              Normal
  04/24/2026 05 AM PDT           10.90           3122         0              Normal
  04/24/2026 06 AM PDT           10.90           3122         0              Normal
  04/24/2026 07 AM PDT           10.90           3122         0              Normal
  04/24/2026 08 AM PDT           10.89           3113         -              Normal
  04/24/2026 09 AM PDT           10.89           3113         0              Normal
  04/24/2026 10 AM PDT           10.89           3113         0              Normal
  04/24/2026 11 AM PDT           10.88           3104         -              Normal
  04/24/2026 12 PM PDT           10.88           3104         0              Normal
  04/24/2026 01 PM PDT           10.87           3095         -              Normal
  04/24/2026 02 PM PDT           10.86           3087         -              Normal
  04/24/2026 03 PM PDT           10.85           3078         -              Normal
  04/24/2026 04 PM PDT           10.84           3069         -              Normal
  04/24/2026 05 PM PDT           10.84           3069         0              Normal
  04/24/2026 06 PM PDT           10.83           3060         -              Normal
  04/24/2026 07 PM PDT           10.82           3052         -              Normal
  04/24/2026 08 PM PDT           10.81           3043         -              Normal
  04/24/2026 09 PM PDT           10.80           3034         -              Normal
  04/24/2026 10 PM PDT           10.79           3025         -              Normal
  04/24/2026 11 PM PDT           10.79           3025         0              Normal
  04/25/2026 12 AM PDT           10.79           3025         0              Normal
  04/25/2026 01 AM PDT           10.78           3017         -              Normal
  04/25/2026 02 AM PDT           10.78           3017         0              Normal
  04/25/2026 03 AM PDT           10.79           3025         +              Normal
  04/25/2026 04 AM PDT           10.79           3025         0              Normal
  04/25/2026 05 AM PDT           10.79           3025         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.