Upper Big Nemaha Reservoir J-15A

Johnson County, NE

MAYBEConfidence · Low
Best bite window
The highlighted window has passed. This read is still based on the latest cached weather; use the 7-Day forecast below for the next window.
Main reason
dry conditions across the window
Main risk
a front passing through

MAYBE on Upper Big Nemaha Reservoir J-15A — light winds and rising pressure after a passing system for this window. Watch a front passing through. Weather-only read (no on-water history calibrating this yet).

Next forecast window
MAYBE

Fri · Jul 24, 4 AM → 8 AM (America/Chicago)

Full read

The latest cached fishing-weather read for Upper Big Nemaha Reservoir J-15A in Johnson County, NE is MAYBE. Its highlighted window has passed, so use the 7-day forecast below for the next available window. The main factor in its favor was dry conditions across the window, while the main watch-out was a front passing through. Its cached forecast evidence included wind near 6 mph out of the southeast, gusting to 15 mph; surface pressure near 974 hPa on a rising trend; 0.02 inches of rain; and air temperature near 68 °F with light drizzle dominant. Confidence in this cached read is low; it was generated July 23, 2026, 11:14 AM UTC, and reads refresh on a daily cadence. This is a weather-only read built from forecast weather; it does not yet use on-water reports, and confidence is capped until local water data or feedback exists.

UPDATED July 23, 2026, 11:14 AM UTCBUCKET 2026-07-23ENGINE 0.7.0

Conditions at a glance

Wind
6mph

SE · gust 15

Rain / Weather
0.02in

Light drizzle

Temp
68°F

20°C · hum 85%

Pressure
28.76inHg

Rising

7-Day Fishing Forecast

One read per day — the bite call, the window, the weather behind it

  1. Thu · Jul 23
    Window passed
    MAYBE
    A front passing through
    77° / 64°F
    6 mph · SEgust 15
    0.03 in
    ↓ -2.9 hPa
  2. Fri · Jul 24
    4 AM → 8 AM
    MAYBE
    A front passing through
    82° / 66°F
    7 mph · Egust 23
    0.14 in
    ↓ -3.1 hPa
  3. Sat · Jul 25
    7 AM → 11 AM
    MAYBE
    A front passing through
    108° / 72°F
    10 mph · SWgust 32
    0.00 in
    ↓ -3.1 hPa
  4. Sun · Jul 26
    10 AM → 2 PM
    MAYBE
    A front passing through
    111° / 77°F
    14 mph · SWgust 36
    0.00 in
    ↓ -4.2 hPa
  5. Mon · Jul 27
    9 AM → 1 PM
    MAYBE
    A front passing through
    115° / 82°F
    11 mph · NWgust 44
    0.02 in
    ↓ -2.9 hPa
  6. Tue · Jul 28
    4 AM → 8 AM
    MAYBE
    A front passing through
    93° / 75°F
    8 mph · Egust 21
    0.00 in
    ↑ +6.6 hPa
  7. Wed · Jul 29
    4 AM → 8 AM
    MAYBE
    A front passing through
    102° / 72°F
    4 mph · SEgust 29
    0.02 in
    ↓ -0.7 hPa

Last 3 days

Recent context — what just happened

Pressure
Rising
+8.3 hPa over 72h
Rain
Dry stretch
0.03 in totallast 72h
Wind
Calm wind
7 mph · gust 23 · N
Temperature
Cooler
-15.1°F over 72h97–64°F range

Weather-only read. Confidence is capped until local water data or feedback exists.

Nearby waters

Weather data by Open-Meteo — CC BY 4.0. Fishing Weather derives the fishing read.

Upper Big Nemaha Reservoir J-15A Fishing Forecast - NE