Marine Weather and Tides
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
|Sunrise 7:23AM||Sunset 5:49PM||Thursday January 21, 2021 8:19 PM MST (03:19 UTC)||Moonrise 12:30PM||Moonset 1:08AM||Illumination 63%|
7 Day Forecast for Marine Location Near Rillito, AZHourly EDIT Help
Area Discussion for - Tucson, AZ  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS65 KTWC 212136 AFDTWC
Area Forecast Discussion National Weather Service Tucson AZ 236 PM MST Thu Jan 21 2021
SYNOPSIS. Showers and an isolated thunderstorms or two will be possible this afternoon followed by a dry period Friday. Storm systems this weekend into next week will bring cooler temperatures along with valley rain and mountain snow. Also expect gusty winds at times.
DISCUSSION. Water vapor shows the upper level low centered over western Pima County and northern Sonora moving to the east. Synoptic scale lift ahead of this low along with instability/moisture has led to a group of showers with a few isolated lightning strikes forming to the west and southwest of Tucson. Based on current precip gauges these showers are capable of rainfall amounts between 0.10"-0.50" and will likely impact the Tucson metro this afternoon. RAP analysis shows about 250 J/kg of MLCAPE in the area which should sustain this activity through sundown. Hi-res guidance also shows this scenario with shower activity ramping down this evening. There could be some patchy fog in Cochise County early Friday morning, but cloud cover could prevent this from happening. As the low exits the region tonight mostly zonal flow will take over aloft leading to dry conditions on Friday.
This weekend into next week we jump back into an active pattern. Saturday an upper level low will move down the west coast then move through Arizona Sunday. It will bring a much cooler air mass than this past weather system. Moisture will still be in place leading to precip chances again starting Saturday afternoon into Sunday. Showers will be possible north and west of Tucson starting Saturday afternoon and then become more widespread Saturday night and Sunday. Snow levels will be around 6000 feet by Sunday morning with expected snow totals between 4-8 inches through Sunday evening. For valley locations rain amounts are expected to be between 0.05"-0.35". Temperatures will be a few degrees below normal Saturday dropping 10-14 degrees below normal by Sunday.
After the low moves off to the east another trough will make its way down the west coast and impact southern Arizona Monday and Tuesday. This will lead to another round of valley rain and mountain snow both days along with continued cold temperatures. The main impact with this system looks to be snowfall. Snow levels are expected to be around 5000 feet Monday and could drop down to some valley floors by Tuesday morning. GEFS and EPS 1000-500mb thicknesses support this with values around 532 dam. Snow totals will likely be the highest so far this winter with winter weather headlines possibly needing to be issued as we get closer to the event.
AVIATION. Valid through 23/00Z. SCT-BKN clouds 6k-9k ft MSL through the forecast period with SCT valley -SHRA/-TSRA expected thru 22/00Z before diminishing this evening. SFC winds WLY/SWLY around 10 kts becoming light and variable aft 22/03Z and remaining 12 kts or less Friday. Aviation discussion not updated for TAF amendments.
FIRE WEATHER. Lingering showers and embedded thunderstorms will quickly taper off later this afternoon into early evening with dry conditions returning overnight.
A series of colder weather system will then move across the region this weekend into next week, for a continued chance of valley rain and much lower snow levels late Saturday into Sunday and then again Monday afternoon through Tuesday. Some breezy winds are expected during this entire period.
TWC WATCHES/WARNINGS/ADVISORIES. None.
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Tucson Ryan Field Airport, AZ||14 mi||34 min||E 4||10.00 mi||Fair||54°F||48°F||82%||1017.9 hPa|
|Tucson, Tucson International Airport, AZ||19 mi||26 min||ESE 6||10.00 mi||A Few Clouds||55°F||47°F||74%||1015.9 hPa|
Link to 5 minute data for KRYN
Wind History from RYN (wind in knots)
|1 day ago||E|
|2 days ago||SE||SE||NE||W||Calm||Calm||W||S||Calm||S|
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NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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