Mad River near Arcata
9.1 mi- Level
- 5.8 ft
- Flow
- 57 cfs
Forecast peak 5.7 ft Tue 2 AM
Reading from Fri 11:45 PM · NWS gauge page
Appearance
Ends in 7 h 28 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 1:15 AM PDT at KACV
Clear and 41°5°.
Today: low 37°3° (likely 37°3° to 43°6°), high 61°16° (likely 60°16° to 64°18°).
Now 41°5°
Clear · Feels like 37°3°
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 1a | Clear | 42°6° (likely 42°6° to 45°7°) | 40°4° | 0% | 3 mph5 km/h from S, gusts 6 mph9 km/h | 89% | 11% | 0 |
| Sat 2a | Clear | 41°5° (likely 41°5° to 44°7°) | 39°4° | 0% | 3 mph5 km/h from S, gusts 5 mph8 km/h | 88% | 11% | 0 |
| Sat 3a | Clear | 40°4° (likely 40°4° to 44°7°) | 37°3° | 0% | 3 mph5 km/h from S, gusts 5 mph8 km/h | 88% | 10% | 0 |
| Sat 4a | Clear | 39°4° (likely 39°4° to 44°7°) | 37°3° | 0% | 3 mph5 km/h from S, gusts 5 mph8 km/h | 86% | 9% | 0 |
| Sat 5a | Clear | 38°3° (likely 38°3° to 44°7°) | 38°3° | 0% | 2 mph3 km/h from SSE, gusts 5 mph9 km/h | 84% | 8% | 0 |
| Sat 6a | Clear | 38°3° (likely 38°3° to 44°7°) | 38°3° | 0% | 2 mph3 km/h from SSE, gusts 5 mph8 km/h | 83% | 6% | 0 |
| Sat 7a | Clear | 37°3° (likely 37°3° to 44°7°) | 37°3° | 0% | 2 mph3 km/h from SSE, gusts 5 mph8 km/h | 81% | 3% | 0 |
| Sat 8a | Sunny | 37°3° (likely 37°3° to 45°7°) | 37°3° | 0% | 1 mph2 km/h from SSE, gusts 5 mph8 km/h | 80% | 5% | 0 |
| Sat 9a | Sunny | 42°6° (likely 42°6° to 50°10°) | 42°6° | 0% | 1 mph2 km/h from SSE, gusts 4 mph7 km/h | 77% | 16% | 1 |
| Sat 10a | Sunny | 49°9° (likely 49°9° to 56°13°) | 49°9° | 0% | 1 mph2 km/h from SSE, gusts 3 mph5 km/h | 73% | 34% | 2 |
| Sat 11a | Sunny | 53°12° (likely 53°12° to 61°16°) | 53°12° | 0% | 3 mph5 km/h from NW, gusts 3 mph6 km/h | 64% | 39% | 3 |
| Sat 12p | Sunny | 55°13° (likely 55°13° to 63°17°) | 55°13° | 0% | 3 mph5 km/h from NW, gusts 4 mph6 km/h | 63% | 41% | 4 |
| Sat 1p | Sunny | 58°14° (likely 58°14° to 64°18°) | 58°14° | 0% | 3 mph5 km/h from NW, gusts 5 mph7 km/h | 60% | 41% | 4 |
| Sat 2p | Sunny | 59°15° (likely 59°15° to 64°18°) | 59°15° | 0% | 5 mph8 km/h from NW, gusts 5 mph9 km/h | 58% | 42% | 4 |
| Sat 3p | Sunny | 59°15° (likely 59°15° to 63°17°) | 59°15° | 0% | 5 mph8 km/h from NW, gusts 6 mph10 km/h | 60% | 39% | 4 |
| Sat 4p | Partly sunny | 60°16° (likely 58°14° to 61°16°) | 60°16° | 0% | 5 mph8 km/h from NW, gusts 7 mph11 km/h | 64% | 30% | 3 |
| Sat 5p | Partly sunny | 56°13° (likely 56°13° to 59°15°) | 56°13° | 0% | 3 mph5 km/h from NNW, gusts 7 mph12 km/h | 71% | 32% | 1 |
| Sat 6p | Clear | 54°12° (likely 53°12° to 56°13°) | 54°12° | 0% | 3 mph5 km/h from NNW, gusts 7 mph11 km/h | 78% | 35% | 1 |
| Sat 7p | Clear | 53°12° (likely 49°9° to 53°12°) | 53°12° | 0% | 3 mph5 km/h from NNW, gusts 6 mph10 km/h | 83% | 16% | 0 |
| Sat 8p | Mostly clear | 48°9° (likely 47°8° to 50°10°) | 48°9° | 0% | 1 mph2 km/h from NNE, gusts 5 mph9 km/h | 86% | 22% | 0 |
| Sat 9p | Mostly cloudy | 47°8° (likely 46°8° to 49°9°) | 47°8° | 0% | 1 mph2 km/h from NNE, gusts 4 mph6 km/h | 89% | 52% | 0 |
| Sat 10p | Cloudy | 46°8° (likely 45°7° to 48°9°) | 46°8° | 0% | 1 mph2 km/h from NNE, gusts 4 mph6 km/h | 90% | 68% | 0 |
| Sat 11p | Mostly cloudy | 45°7° (likely 45°7° to 47°8°) | 45°7° | 0% | 1 mph2 km/h from E, gusts 4 mph6 km/h | 91% | 73% | 0 |
| Sun 12a | Cloudy | 44°7° (likely 44°7° to 47°8°) | 44°7° | 0% | 1 mph2 km/h from E, gusts 4 mph6 km/h | 92% | 77% | 0 |
| Sun 1a | Cloudy | 43°6° (likely 43°6° to 47°8°) | 43°6° | 0% | 1 mph2 km/h from E, gusts 3 mph5 km/h | 93% | 78% | 0 |
| Sun 2a | Cloudy | 42°6° (likely 42°6° to 48°9°) | 42°6° | 0% | 1 mph2 km/h from E, gusts 4 mph6 km/h | 95% | 80% | 0 |
| Sun 3a | Cloudy | 41°5° (likely 41°5° to 48°9°) | 41°5° | 0% | 1 mph2 km/h from E, gusts 4 mph7 km/h | 96% | 81% | 0 |
| Sun 4a | Cloudy | 40°4° (likely 40°4° to 47°8°) | 40°4° | 0% | 1 mph2 km/h from E, gusts 4 mph7 km/h | 97% | 80% | 0 |
| Sun 5a | Fog | 39°4° (likely 39°4° to 47°8°) | 39°4° | 0% | 1 mph2 km/h from E, gusts 5 mph7 km/h | 97% | 81% | 0 |
| Sun 6a | Fog | 38°3° (likely 38°3° to 46°8°) | 38°3° | 0% | 1 mph2 km/h from E, gusts 5 mph8 km/h | 97% | 79% | 0 |
| Sun 7a | Fog | 38°3° (likely 38°3° to 46°8°) | 38°3° | 0% | 1 mph2 km/h from E, gusts 5 mph8 km/h | 97% | 75% | 0 |
| Sun 8a | Fog | 39°4° (likely 39°4° to 46°8°) | 39°4° | 0% | 1 mph2 km/h from ESE, gusts 5 mph8 km/h | 95% | 73% | 0 |
| Sun 9a | Fog | 42°6° (likely 42°6° to 49°9°) | 42°6° | 0% | 1 mph2 km/h from ESE, gusts 4 mph7 km/h | 90% | 63% | 0 |
| Sun 10a | Cloudy | 48°9° (likely 48°9° to 54°12°) | 48°9° | 0% | 1 mph2 km/h from ESE, gusts 5 mph8 km/h | 83% | 80% | 1 |
| Sun 11a | Cloudy | 53°12° (likely 53°12° to 57°14°) | 53°12° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 76% | 84% | 2 |
| Sun 12p | Cloudy | 56°13° (likely 55°13° to 59°15°) | 56°13° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 71% | 86% | 3 |
| Sun 1p | Cloudy | 58°14° (likely 57°14° to 61°16°) | 58°14° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 68% | 88% | 3 |
| Sun 2p | Cloudy | 59°15° (likely 57°14° to 61°16°) | 59°15° | 0% | 3 mph5 km/h from W, gusts 6 mph10 km/h | 67% | 92% | 3 |
| Sun 3p | Cloudy | 59°15° (likely 57°14° to 60°16°) | 59°15° | 0% | 3 mph5 km/h from W, gusts 6 mph9 km/h | 69% | 92% | 2 |
| Sun 4p | Mostly cloudy | 58°14° (likely 57°14° to 59°15°) | 58°14° | 0% | 3 mph5 km/h from W, gusts 7 mph11 km/h | 73% | 51% | 2 |
| Sun 5p | Sunny | 57°14° (likely 56°13° to 58°14°) | 57°14° | 30% | 2 mph3 km/h from W, gusts 8 mph13 km/h | 78% | 46% | 1 |
| Sun 6p | Clear | 55°13° (likely 54°12° to 56°13°) | 55°13° | 30% | 2 mph3 km/h from W, gusts 7 mph12 km/h | 82% | 20% | 0 |
| Sun 7p | Rain | 53°12° (likely 52°11° to 53°12°) | 53°12° | 30% | 2 mph3 km/h from W, gusts 10 mph16 km/h | 87% | 46% | 0 |
| Sun 8p | Rain | 51°11° (likely 49°9° to 54°12°) | 51°11° | 30% | 1 mph2 km/h from SSE, gusts 10 mph16 km/h | 90% | 45% | 0 |
| Sun 9p | Mostly clear | 50°10° (likely 49°9° to 51°11°) | 50°10° | 30% | 1 mph2 km/h from SSE, gusts 11 mph17 km/h | 92% | 33% | 0 |
| Sun 10p | Clear | 49°9° (likely 49°9° to 52°11°) | 49°9° | 30% | 1 mph2 km/h from SSE, gusts 11 mph17 km/h | 93% | 34% | 0 |
| Sun 11p | Rain | 48°9° (likely 48°9° to 53°12°) | 47°8° | 60%, 0.07 in1.8 mm | 3 mph5 km/h from SSE, gusts 12 mph20 km/h | 93% | 78% | 0 |
| Mon 12a | Rain | 47°8° (likely 47°8° to 53°12°) | 46°8° | 60%, 0.07 in1.8 mm | 3 mph5 km/h from SSE, gusts 7 mph11 km/h | 94% | 82% | 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: Patchy frost before 11am. Mostly sunny. High near 61, with temperatures falling to around 56 in the afternoon. Northwest wind 1 to 5 mph.
Tonight: Patchy frost after 5am. Mostly clear, with a low around 37. South southeast wind around 3 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
30% chance
Evening
6 PM–midnight
60% chance · 0.07 in1.8 mm
Overnight
midnight–6 AM
70% chance · 0.17 in4.2 mm
Official NWS forecast
Day: Patchy fog before 11am, then a chance of rain. Partly sunny, with a high near 60. South wind 0 to 3 mph. Chance of precipitation is 30%.
Night: Rain likely. Mostly cloudy, with a low around 43. South wind around 3 mph. Chance of precipitation is 60%. 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
70% chance · 0.03 in0.7 mm
Afternoon
noon–6 PM
50% chance · 0.03 in0.8 mm
Evening
6 PM–midnight
30% chance
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely. Mostly cloudy, with a high near 58. South southwest wind 2 to 6 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
Night: A chance of rain before 5am. Mostly cloudy, with a low around 41. 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: Partly sunny, with a high near 57.
Night: Patchy fog after 5am. Mostly 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
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 before 11am. Partly sunny, with a high near 59.
Night: Patchy fog after 8pm. Mostly cloudy, with a low around 42.
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 before 11am, then a slight chance of rain. Partly sunny, with a high near 60.
Night: A slight chance of rain before 8pm, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
30% chance
Overnight
midnight–6 AM
20% chance
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 59.
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
Dry
Afternoon
noon–6 PM
20% chance · 0.04 in1.1 mm
Evening
6 PM–midnight
20% chance · 0.22 in5.6 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°.
Dry, high 60°, low 43°.
57% chance of rain, high 58°, low 41°.
Mostly dry, highs 57–64°.
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 Fri 11:45 PM · NWS gauge page
Forecast peak 0.2 ft Sat 1 AM
Reading from Fri 11:15 PM · NWS gauge page
Forecast peak 8.8 ft Sat 5 AM
Reading from Sat 12:15 AM · NWS gauge page
Forecast peak -0.3 ft Tue 5 AM
Reading from Fri 11:15 PM · 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 15 hours are near freezing and damp, when outdoor units defrost more often.
Dry air outside (dew point 39°F).
No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.
Today’s expected high is about typical for the date.
On average 0° colder than normal (daily mean temperature).
Myrtletown weather by month: normals, records, snow and freeze dates
Sunrise 7:38 AM, sunset 6:22 PM.
Clear 1:32–7:10 AM; moon 96% lit, sets 5:58 AM.
Waxing gibbous
96% lit · growing