Sunday, August 19, 2018
The Steamboat Springs area is currently experiencing a delightfully cool Sunday with a noon temperature around 60 F, courtesy of cool northwest flow behind a departing storm. The storm brought beneficial rains to the Yampa Valley this weekend, with between one and two tenths of an inch associated with a 6 pm thunderstorm Friday and another three to four tenths mostly occurring during steadier rainfall Saturday morning.
Energy still rotating around the backside of the storm will drag a reinforcing shot of cool and dry air over our area this evening leading to a chilly start to Monday morning, and another day of pleasant temperatures below or close to average.
Meanwhile, a Pacific storm that is currently stalled over Oregon will interact with both some cool air dropping southward from western Canada and monsoonal moisture moving northward along the western periphery of the rebuilding southwestern U.S. ridge. Most of the Canadian cool air will move eastward through the northern Rockies and bring a cool front through Wyoming Monday night, with precipitation initially looking to stay north of Colorado border. However, by Tuesday afternoon and especially overnight, monsoonal moisture and energy will then move over our area, bringing a good chance of accumulating rainfall.
By Wednesday, the bulk of the Oregon storm is forecast to begin moving eastward across the northern Rockies, and we should see a continued chance of more intermittent but possibly strong storms from Wednesday through Thursday evening.
Drier air moves in behind the departing storm for Friday and the first part of the weekend, though another quick moving Pacific storm is forecast to cross the Pacific Northwest coast around then. Early indications are that this will nudge the southwestern ridge of high pressure back to the east, and that will re-open the door to more monsoonal moisture moving northward along the western periphery of the ridge. Some of this moisture may move over our area by late in the weekend for an increasing chance of showers as early as Sunday.
Thursday, August 16, 2018
The Steamboat Springs area will see continued hot temperatures for this Thursday and Friday before an incoming Pacific storm knocks afternoon temperatures back toward or even below our 81 F average high for this time of year in time for the weekend.
Currently, some moisture has been drawn northward underneath the ridge of high pressure over the western U.S. that is responsible for our hot temperatures, though the moisture is forecast to stay largely south of our area today. By Friday, we will see some of that moisture move near or over north central Colorado, and that will lead to a better chance of some clouds and a slight chance of some weak and gusty afternoon storms that may produce brief, locally heavy rainfall.
Meanwhile, the incoming Pacific storm is forecast to cross the West Coast on Friday and bring a cool front through our area sometime around Saturday morning. As currently predicted by weather forecast models, we should see our best chance of showers early in the day as the cool front passes, with a break early in the afternoon as drier air infiltrates behind the front.
But several reinforcing surges of cool air in northwest flow on the backside of the storm may get showers going again later Saturday and again Sunday afternoon before skies clear overnight, leading to relatively cool Sunday and Monday mornings.
After a pleasantly cool Monday with temperatures slightly below average, a final surge of cool air will keep cool temperatures around early Tuesday before they soar to above average by Tuesday afternoon as the western ridge of high pressure rebuilds behind the departing storm.
Another Pacific storm will be deflected northward by this ridge early in the work week, though not before moving it eastward enough so we may see some increasing monsoonal moisture by midweek. This would lead to an increasing chance of showers for around Wednesday and Thursday before the atmosphere dries again during the end of the work week. After that, weather forecast models disagree on the strength and southern extent of another cool front timed for around the following weekend.
Sunday, August 12, 2018
Shower chances increase starting around Monday night as the Steamboat Springs area will see weather associated with both a storm currently spinning to our southeast and incoming Pacific energy.
The meteorologically interesting storm to our southeast has kept light northeasterly flow over northern Colorado this weekend, and as this storm moves to the northeast starting Monday, the flow aloft will turn to the northwest as a weak cool front associated with a Pacific storm traveling along the Canadian border is dragged across our area late Monday night or early Tuesday morning. Until then expect continued hot temperatures with only the slightest chance of a weak late-day storm for the rest of this Sunday and Monday.
We should see temperatures tick down a bit for Tuesday and Wednesday behind the weak front, but more significantly, we will see some increasing moisture and the possibility of some showers starting overnight Monday, with some of them producing brief, locally heavy rainfall for those areas lucky enough to be under the stronger thunderstorm cells.
The heat will return for the end of the work week as a ridge of high pressure temporarily builds behind the departing storm to our north, though there will be some moisture that may produce some afternoon clouds and the small chance of some showers.
The weekend is looking interesting, though more uncertain, as some left over energy off the West Coast from the early week storm looks to eventually mix with some cool western Canadian air. And yes, this could produce our first fall-like cool front with temperatures below average by the end of next weekend or the beginning of the next work week, but there is weather forecast model disagreement as to the extent and timing of the cool air surge.
Right now, the American GFS has shower chances increasing for northern Colorado early in the weekend as the weak Pacific storm approaches. A relatively strong surge of cool air from the north is forecast to then reinforce the storm as it moves over our area late in the weekend, and this should bring increasing shower chances and below average temperatures by the start of the following work week.
Thursday, August 9, 2018
A ridge of high pressure currently over the western U.S. will bring hot days and cool nights to the Steamboat Springs area through this weekend before shower chances increase around Tuesday ahead of a large, but weakening, eastward moving Gulf of Alaska storm.
The storm is forecast to make landfall in the Pacific Northwest early this weekend, and it will flatten and push the ridge of high pressure eastward as the storm moves along the southern Canadian border. But this is a battle of the air masses that summer will win as the jet stream will stay north of our area for the foreseeable future.
Meteorologically interesting, but unlikely to have much effect on our weather except for possibly some slight cooling on Monday and Tuesday, some energy peeling away from southward moving air that was originally spinning around a large storm in Hudson Bay will form an eddy that will meander around the Texas panhandle and southeastern Colorado through part of next week. Normally, we would expect to see some monsoonal moisture drawn northward along the west side of the flattened ridge of high pressure to our east, but instead light northerly flow on the west side of the eddy will keep moisture and showers at bay through Monday when the forecast finally has the eddy moving eastward.
At that time, southerly flow around the ridge of high pressure to our east will penetrate into northern Colorado, bringing our best chance of showers on Tuesday and Wednesday. The flattened ridge of high pressure is forecast to move westward through the work week and then rebuild over the West Coast around the following weekend. We should see a much reduced chance of showers for Thursday and Friday as remaining moisture under the ridge is heated by the strong summertime sun.
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Sunday, August 5, 2018
After a welcome second morning of rain showers in three days, the Steamboat Springs area will be returning to hot and dry weather this upcoming week. The ridge of high pressure that was flattened and pushed eastward by a grazing Pacific storm to our north this past weekend will rebuild over the West Coast as southerly flow ahead of a strong fall-like in the Gulf of Alaska storm draws hot air northward.
Currently, even though dry air is moving in behind the grazing storm, lingering moisture and energy will continue the threat of afternoon storms this Sunday, with perhaps some breezy conditions. This looks to be the end of our precipitation chances until next weekend, or after, as the building West Coast ridge keeps dry air firmly entrenched over western Colorado.
Monday will be the coolest day of the week with temperatures approaching our 82 F average as some cooler air is left behind the departing storm to our north, but hot temperatures will return by Tuesday and last into the weekend. Luckily, the dry air will allow overnight low temperatures to drop toward or even below our 46 F average, which means we will see daily swings between lows and highs approaching 40 F or more!
The fall-like Gulf of Alaska storm will be reinforced by some cool air traveling southward across Alaska near the end of the work week, and weather forecast models disagree on the evolution of the storm through next weekend. This affects our weather since the eastward moving storm will be responsible for again flattening the ridge of high pressure over the West Coast and moving it eastward, and it is not clear if that will happen by the end of next weekend or during the next work week. When the ridge eventually moves eastward, we will likely see moisture increase again in the southerly flow along the western periphery of the ridge which would bring the possibility of showers back to our area.
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