Mad River near Arcata
8.9 mi- Level
- 5.7 ft
- Flow
- 55 cfs
Forecast peak 5.7 ft Tue 2 AM
Reading from Sat 5:45 AM · NWS gauge page
Appearance
Ends in 1 h 27 min
Issued for this forecast zone · National Weather Service Eureka CA
What
Temperatures as low as 35 will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender plants from the cold.
Areas: Coastal Del Norte; Northern Coastal Humboldt
See it on weather.gov (opens in a new tab)Observed 7:00 AM PDT at KACV
Clear and 37°3°.
Today: low 37°3° (likely 37°3° to 43°6°), high 61°16° (likely 58°14° to 64°18°).
Now 37°3°
Clear
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 7a | Clear | 36°2° (likely 36°2° to 46°8°) | 32°0° | 0% | 5 mph8 km/h from ENE, gusts 5 mph7 km/h | 75% | 4% | 0 |
| Sat 8a | Sunny | 36°2° (likely 36°2° to 47°8°) | 32°0° | 0% | 2 mph3 km/h from NE, gusts 4 mph7 km/h | 76% | 8% | 0 |
| Sat 9a | Mostly sunny | 40°4° (likely 40°4° to 48°9°) | 38°3° | 0% | 2 mph3 km/h from NE, gusts 4 mph7 km/h | 72% | 12% | 0 |
| Sat 10a | Sunny | 48°9° (likely 48°9° to 55°13°) | 47°8° | 0% | 2 mph3 km/h from NE, gusts 5 mph8 km/h | 68% | 9% | 1 |
| Sat 11a | Sunny | 51°11° (likely 51°11° to 60°16°) | 51°11° | 0% | 2 mph3 km/h from WSW, gusts 5 mph8 km/h | 65% | 7% | 2 |
| Sat 12p | Mostly sunny | 54°12° (likely 54°12° to 62°17°) | 54°12° | 0% | 2 mph3 km/h from WSW, gusts 5 mph8 km/h | 62% | 11% | 3 |
| Sat 1p | Sunny | 57°14° (likely 57°14° to 62°17°) | 57°14° | 0% | 2 mph3 km/h from WSW, gusts 7 mph11 km/h | 59% | 42% | 3 |
| Sat 2p | Sunny | 59°15° (likely 57°14° to 64°18°) | 59°15° | 0% | 3 mph5 km/h from N, gusts 8 mph13 km/h | 58% | 42% | 3 |
| Sat 3p | Sunny | 60°16° (likely 56°13° to 63°17°) | 60°16° | 0% | 3 mph5 km/h from N, gusts 9 mph14 km/h | 58% | 41% | 3 |
| Sat 4p | Sunny | 60°16° (likely 55°13° to 61°16°) | 60°16° | 0% | 3 mph5 km/h from N, gusts 9 mph14 km/h | 59% | 41% | 1 |
| Sat 5p | Sunny | 58°14° (likely 54°12° to 58°14°) | 58°14° | 0% | 3 mph5 km/h from NNE, gusts 8 mph13 km/h | 64% | 40% | 1 |
| Sat 6p | Clear | 55°13° (likely 52°11° to 55°13°) | 55°13° | 0% | 3 mph5 km/h from NNE, gusts 7 mph11 km/h | 75% | 40% | 1 |
| Sat 7p | Clear | 52°11° (likely 49°9° to 52°11°) | 52°11° | 0% | 3 mph5 km/h from NNE, gusts 5 mph8 km/h | 81% | 40% | 0 |
| Sat 8p | Clear | 48°9° (likely 47°8° to 50°10°) | 48°9° | 0% | 3 mph5 km/h from NE, gusts 4 mph7 km/h | 87% | 40% | 0 |
| Sat 9p | Mostly cloudy | 47°8° (likely 46°8° to 49°9°) | 47°8° | 0% | 3 mph5 km/h from NE, gusts 4 mph6 km/h | 88% | 50% | 0 |
| Sat 10p | Cloudy | 45°7° (likely 45°7° to 48°9°) | 45°7° | 0% | 3 mph5 km/h from NE, gusts 4 mph7 km/h | 90% | 66% | 0 |
| Sat 11p | Mostly cloudy | 44°7° (likely 44°7° to 47°8°) | 44°7° | 0% | 6 mph10 km/h from E, gusts 5 mph8 km/h | 91% | 73% | 0 |
| Sun 12a | Cloudy | 43°6° (likely 43°6° to 47°8°) | 43°6° | 0% | 6 mph10 km/h from E, gusts 5 mph9 km/h | 90% | 77% | 0 |
| Sun 1a | Cloudy | 42°6° (likely 42°6° to 47°8°) | 42°6° | 0% | 6 mph10 km/h from E, gusts 6 mph9 km/h | 91% | 77% | 0 |
| Sun 2a | Cloudy | 42°6° (likely 42°6° to 46°8°) | 42°6° | 0% | 1 mph2 km/h from ENE, gusts 6 mph10 km/h | 91% | 79% | 0 |
| Sun 3a | Cloudy | 40°4° (likely 40°4° to 46°8°) | 40°4° | 0% | 1 mph2 km/h from ENE, gusts 7 mph11 km/h | 89% | 78% | 0 |
| Sun 4a | Mostly cloudy | 40°4° (likely 40°4° to 46°8°) | 40°4° | 0% | 1 mph2 km/h from ENE, gusts 8 mph13 km/h | 90% | 69% | 0 |
| Sun 5a | Mostly cloudy | 39°4° (likely 39°4° to 46°8°) | 39°4° | 0% | 1 mph2 km/h from E, gusts 8 mph14 km/h | 91% | 63% | 0 |
| Sun 6a | Mostly cloudy | 38°3° (likely 38°3° to 45°7°) | 38°3° | 0% | 1 mph2 km/h from E, gusts 8 mph13 km/h | 89% | 58% | 0 |
| Sun 7a | Mostly cloudy | 37°3° (likely 37°3° to 45°7°) | 37°3° | 0% | 1 mph2 km/h from E, gusts 7 mph11 km/h | 90% | 69% | 0 |
| Sun 8a | Cloudy | 38°3° (likely 38°3° to 46°8°) | 38°3° | 0% | 2 mph3 km/h from E, gusts 6 mph10 km/h | 92% | 67% | 0 |
| Sun 9a | Cloudy | 41°5° (likely 41°5° to 48°9°) | 41°5° | 0% | 2 mph3 km/h from E, gusts 6 mph9 km/h | 89% | 84% | 0 |
| Sun 10a | Cloudy | 46°8° (likely 46°8° to 52°11°) | 46°8° | 0% | 2 mph3 km/h from E, gusts 4 mph7 km/h | 85% | 87% | 1 |
| Sun 11a | Cloudy | 50°10° (likely 50°10° to 56°13°) | 50°10° | 5% | 0 mph0 km/h, gusts 5 mph8 km/h | 80% | 90% | 2 |
| Sun 12p | Cloudy | 53°12° (likely 52°11° to 57°14°) | 53°12° | 5% | 0 mph0 km/h, gusts 5 mph8 km/h | 76% | 89% | 3 |
| Sun 1p | Cloudy | 55°13° (likely 52°11° to 58°14°) | 55°13° | 5% | 0 mph0 km/h, gusts 5 mph8 km/h | 73% | 98% | 3 |
| Sun 2p | Cloudy | 56°13° (likely 53°12° to 58°14°) | 56°13° | 5% | 2 mph3 km/h from WSW, gusts 5 mph7 km/h | 71% | 98% | 3 |
| Sun 3p | Partly sunny | 57°14° (likely 54°12° to 58°14°) | 57°14° | 5% | 2 mph3 km/h from WSW, gusts 4 mph7 km/h | 71% | 83% | 3 |
| Sun 4p | Mostly cloudy | 57°14° (likely 54°12° to 57°14°) | 57°14° | 5% | 2 mph3 km/h from WSW, gusts 5 mph8 km/h | 72% | 39% | 2 |
| Sun 5p | Sunny | 56°13° (likely 54°12° to 56°13°) | 56°13° | 40%, 0.01 in0.3 mm | 1 mph2 km/h from SW, gusts 7 mph11 km/h | 75% | 6% | 1 |
| Sun 6p | Clear | 54°12° (likely 52°11° to 54°12°) | 54°12° | 40%, 0.01 in0.3 mm | 1 mph2 km/h from SW, gusts 7 mph11 km/h | 80% | 42% | 0 |
| Sun 7p | Rain | 51°11° (likely 50°10° to 52°11°) | 51°11° | 40%, 0.01 in0.3 mm | 1 mph2 km/h from SW, gusts 8 mph13 km/h | 87% | 52% | 0 |
| Sun 8p | Rain | 49°9° (likely 48°9° to 52°11°) | 49°9° | 40%, 0.01 in0.3 mm | 1 mph2 km/h from SSE, gusts 11 mph17 km/h | 92% | 45% | 0 |
| Sun 9p | Cloudy | 48°9° (likely 48°9° to 52°11°) | 48°9° | 40%, 0.01 in0.3 mm | 1 mph2 km/h from SSE, gusts 12 mph20 km/h | 94% | 67% | 0 |
| Sun 10p | Cloudy | 47°8° (likely 47°8° to 52°11°) | 47°8° | 40%, 0.01 in0.3 mm | 1 mph2 km/h from SSE, gusts 13 mph21 km/h | 95% | 76% | 0 |
| Sun 11p | Rain | 47°8° (likely 47°8° to 52°11°) | 46°8° | 70%, 0.1 in2.5 mm | 3 mph5 km/h from SSE, gusts 13 mph21 km/h | 95% | 98% | 0 |
| Mon 12a | Drizzle | 46°8° (likely 46°8° to 52°11°) | 45°7° | 70%, 0.1 in2.5 mm | 3 mph5 km/h from SSE, gusts 11 mph17 km/h | 95% | 98% | 0 |
| Mon 1a | Rain | 46°8° (likely 46°8° to 51°11°) | 44°7° | 70%, 0.1 in2.5 mm | 3 mph5 km/h from SSE, gusts 10 mph15 km/h | 95% | 92% | 0 |
| Mon 2a | Rain | 45°7° (likely 45°7° to 50°10°) | 44°7° | 70%, 0.1 in2.5 mm | 3 mph5 km/h from SSE, gusts 7 mph12 km/h | 95% | 87% | 0 |
| Mon 3a | Rain | 44°7° (likely 44°7° to 50°10°) | 43°6° | 70%, 0.1 in2.5 mm | 3 mph5 km/h from SSE, gusts 7 mph11 km/h | 96% | 81% | 0 |
| Mon 4a | Rain | 44°7° (likely 44°7° to 50°10°) | 42°6° | 70%, 0.1 in2.5 mm | 3 mph5 km/h from SSE, gusts 6 mph10 km/h | 98% | 84% | 0 |
| Mon 5a | Cloudy | 43°6° (likely 43°6° to 49°9°) | 42°6° | 60%, 0.04 in1 mm | 3 mph5 km/h from SSE, gusts 8 mph13 km/h | 99% | 88% | 0 |
| Mon 6a | Drizzle | 43°6° (likely 43°6° to 49°9°) | 41°5° | 60%, 0.04 in1 mm | 3 mph5 km/h from SSE, gusts 8 mph13 km/h | 100% | 90% | 0 |
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Today: Areas of frost before 11am. Mostly sunny, with a high near 61. North northeast wind around 5 mph.
Tonight: Patchy frost after 5am. Mostly cloudy, with a low around 37. East northeast wind 1 to 6 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
40% chance · 0.01 in0.3 mm
Evening
6 PM–midnight
70% chance · 0.15 in3.8 mm
Overnight
midnight–6 AM
70% chance · 0.54 in14 mm
Official NWS forecast
Day: Patchy frost before 8am, then a chance of rain. Partly sunny, with a high near 58. South wind around 2 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Night: A chance of rain before 8pm, then rain likely and patchy fog. Mostly cloudy, with a low around 41. South southeast wind around 3 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
70% chance · 0.11 in2.7 mm
Afternoon
noon–6 PM
60% chance · 0.04 in1.1 mm
Evening
6 PM–midnight
20% chance
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely before 11am, then showers and thunderstorms likely. Partly sunny, with a high near 55. South wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
Night: A chance of showers and thunderstorms before 11pm, then a chance of rain between 11pm and 5am. Mostly cloudy, with a low around 40. East southeast wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 11am and 2pm. Mostly sunny, with a high near 57.
Night: Mostly cloudy, with a low around 39.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 58.
Night: Patchy fog between 8pm and 11pm. Partly cloudy, with a low around 40.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
20% chance
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Patchy fog between 8am and 11am. Mostly sunny, with a high near 58.
Night: Patchy fog between 8pm and 11pm, then a slight chance of rain. Mostly cloudy, with a low around 41.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
20% chance · 0.1 in2.6 mm
Evening
6 PM–midnight
30% chance · 0.1 in2.4 mm
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain before 8am, then a chance of rain and patchy fog. Partly sunny, with a high near 58.
Night: A chance of rain before 8pm. Partly cloudy, with a low around 41.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
20% chance · 0.03 in0.8 mm
Afternoon
noon–6 PM
30% chance · 0.15 in3.8 mm
Evening
6 PM–midnight
30% chance · 0.1 in2.5 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Dry, high 61°, low 37°.
36% chance of rain, high 58°, low 41°, cooling off.
62% chance of rain, high 55°, low 40°, cooling off.
Mostly dry, highs 55–59°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (EKA) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 5.7 ft Tue 2 AM
Reading from Sat 5:45 AM · NWS gauge page
Forecast peak 10.4 ft Tue 10 AM
Reading from Sat 5:15 AM · NWS gauge page
Forecast peak 11.0 ft Sat 7 AM
Reading from Sat 6 AM · NWS gauge page
Reading from Sat 5:30 AM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
About 60% less heating than a typical week.
Heating degree days, base 65°F
47, 17 and 5°F are the test points heat pumps are rated at. About 9 hours are near freezing and damp, when outdoor units defrost more often.
Dry air outside (dew point 37°F).
Today, 3:00 PM–4:00 PM
Good stretch to open the windows.
Today’s expected high is 2°1° colder than typical.
On average 2°1° colder than normal (daily mean temperature).
Westhaven-Moonstone weather by month: normals, records, snow and freeze dates
Sunrise 7:38 AM, sunset 6:22 PM.
Clouds most of the night (about 63% cover).
Waxing gibbous
97% lit · growing