Isolated thunderstorms will be possible Sunday afternoon through early evening ahead of a cold front. Recently, some data has been hinting toward a potentially severe event. Unlike past events, this is an extremely complex forecast with many driving factors. While potentially widespread, conditions leading up to the event may very well also hinder development. The main question will be whether storms materialize or not.
Timing: The main severe threat appears to be anytime after 12:00 noon through sunset.
Main Threats: All modes of severe weather are possible, including damaging winds, large hail, heavy rainfall, and an isolated tornado.
Midday tomorrow will feature an advancing warm front, which will cause clouds and scattered showers throughout the region. Behind the warm front will be an extremely moist air mass (dew points in the mid-upper 70’s). This will help result in high CAPE (Convective Available Potential Energy) values of up to ~3,000 J/kg, which is extremely favorable for severe weather development. Also, there will be a good deal of shear, which could allow for a few cells to rotate, resulting in an isolated tornado or two. While likely not a widespread tornadic event, it cannot be completely ruled out at any given location. The Storm Prediction Center has placed nearly our entire region in a slight risk (level 2 out of 5) for severe thunderstorms.
Simulated radar for Sunday (Aug 2nd) :
Conflictingly, many model runs show lingering cloud cover after the warm front passes, which will put a cap on any convection. Also, widespread cloud cover will not allow for surface heating, which is essential for updrafts. This appears to be the case on the most recent run of the Nam 3 km, which doesn’t show much convective development due to cloud cover. While a possible solution, it will only take a couple of breaks of sunshine to create a very unstable atmosphere, resulting in severe thunderstorm development. Like always, we will monitor this situation and give updates as we get closer in time.
Have a great evening!
Our weekend weather appears rather quiet. Some standard summer weather to open the first few days of August. Nothing that should have major impacts on your weekend plans.
So as we turn the calendar to August in the Hudson Valley, it’s the tropics that will grab our local attention. On Friday, Hurricane Isaias formed in the Caribbean, and as you can see by the 11pm Friday advisory… it’s got the eastern US within its sights. The ‘cone of uncertainty’ with Isaias is relatively narrow… which means that we have a fairly good idea of what to expect with the track.
You’ll easily notice the upper air pattern provides a path right up the eastern seaboard for Isaias. An approaching upper level trough will push toward the east coast ahead of Isaias. At the same time, a large upper level ridge over the Atlantic will be sliding further east. The area between the two features will be where Isaias makes it’s path. The biggest uncertainty, is exactly where these features shown above are positioned. This will mean the difference of a few hundred miles in the track, and the position of the heaviest rains in the coming days.
As it stands right now, this could be the rainfall scenario for the Hudson Valley between Monday and Wednesday…
A period of rain and thunderstorms could develop out ahead of Isaias on Monday, followed by the remnants of Hurricane Isaias on Tuesday. All told, 2 to 5 inches or rainfall could be possible… with localized amounts over 6″. The key to everything, is the track. Which we just mentioned could shift a couple hundred miles either way as it moves up the east coast. You’ll see in the graphic above, the rainfall swath is now extremely wide… so the amount of projected rainfall is dependent on the path of Isaias. For that reason, you’ll want to keep an eye on the forecast as we are able to focus in on the details a bit better.
Finally, just to bring some piece of mind to some of you. Any time we are talking about a tropical storm, one of the first things some people think of, is wind damage. For the Hudson Valley, Isaias does not present a major concern with regard to wind.
This map shows the maximum wind gusts up and down the east coast from what would be Tropical Storm Isaias. There are a few hurricane force gusts into parts of Virginia and North Carolina… but further north, gusts up to 50 or 60 mph are possible. The black curve represents the track Isaias takes on this solution. This is probably about as far west as Isaias is expected to track (but once again, we need to monitor it closely). Notice how the strongest wind gusts are to the east of the center of circulation. So unless Isaias were to take a track even further inland (which the cone of uncertainty suggests is not likely), the strongest wind gusts over 35mph, would be east of our area… mainly over Connecticut and Long Island. So as you can see, wind damage is not the real concern at this moment… it’s rainfall.
But as always with a situation like this, the details should come into clearer view as we get closer to the event. Be sure to check back for updates as we get closer. Have a great weekend!
Today will be another hot one throughout the Hudson Valley. Southern regions will see highs in the mid-80’s to near 90° with dew points in the low 70’s. As a result, a heat advisory is in effect for Orange, Putnam, Rockland & Westchester Counties, with heat indexes in the mid-90’s this afternoon. Northern areas will likely stay slightly cooler, especially in the Catskills, with highs near 80°.
A few isolated thunderstorms are possible this afternoon ahead of a cold front (30-40%). Timing appears to be anywhere between 1-7 pm. This will not be a widespread event and while most locations will stay dry, any storm that does form could produce gusty winds and heavy downpours. The Storm Prediction Center has placed our region in a marginal risk (level 1 out of 5) for severe thunderstorms today as a storm or two may approach severe thresholds.
Enjoy your Tuesday!
– Montgomery : 86° feels like 91°
Somehow, it’s the last weekend of July. This time of year is statistically the hottest time of the year, with the average high being 85° in the Poughkeepsie area. So when we look at the weather for this coming weekend, it looks like we’ll be a few degrees above average with comfortable humidity levels for the middle of summer. Here are your projected high temperatures for NY state on Saturday, Sunday and Monday
Projected High Temperatures: Saturday, Sunday & Monday
You can see the Hudson Valley in the lower right quadrant of the graphic. Highs in Poughkeepsie projected to be 89° Saturday, 91° on Saturday, and 92° on Monday. The good news, is that with winds out of the west, humidity levels should be reasonably comfortable. That means ‘real feel’ heat index values very close to the actual air temperature. Each day looks to be rather dry, with hardly any rainfall projected by the European model.
So in short… it looks like a great summer weekend on tap for the Hudson Valley! A fair amount of sunshine… slightly above average summer heat… and comfortable humidity levels. If you have weekend plans, you should be very happy with what is in store.
The last few months have been quite dry across the Northeast US. Much of the rainfall has been dependent on summer afternoon T-Storms. That means considerable variance from one area to the next.
You can see that the SW half of the Hudson Valley is not in a drought condition. That’s due to recent rainfall from T-Storms, giving those areas near normal rainfall amounts over the past month or so. However, the northeastern half of the valley has not seen as much of that rainfall, and is anywhere from abnormally dry, to even in a moderate drought condition as you head into NE Dutchess and Columbia counties. With minimal rainfall expected over the next few days… that will only intensify drought conditions where it’s already being felt.
The good news, is that there may be some thunderstorms on Tuesday or Wednesday with a cold front. But we’ll have to continue to monitor that situation as the weekend progresses.
Long Range Discussion
So far in the month of July, temperatures have been quite warm compared to average. Not hot… but definitely 2° to 5° above average, during the statistically hottest time of the year.
Looking at the next 14 days, into early August… it appears that the focal point of the ridge in the jet stream could shift a bit further west. This could shift temperatures closer to average for this time of year.
We’ll have to see how the details iron out… but the clear thing to state appears to be that we don’t expect a major cool down at this point. Summer is here for the Hudson Valley, and while we don’t see any cooler than average weather, we also don’t see any intense heat waves in the next 2 weeks either.
Have a great weekend!!
Similar to yesterday, today will feature uncomfortably high humidity with a chance of afternoon/evening thunderstorms triggered by a cold front approaching from our west. More clouds than sunshine are expected today, but breaks of sunshine are likely to occur periodically throughout the day, which could cause locally high instability throughout portions of the Hudson Valley.
With temperatures in the mid-upper 80s and dew points in the mid-70s, heat indexes are expected to approach the mid-upper 90s in our southern locations while upper 80s-90° in northern locations, especially the Catskills. Along with very muggy conditions, these ingredients combined will result in a severe threat this afternoon.
Current model guidance suggests storms will begin to develop between 1-3 pm. Storms will move east southeast throughout the remainder of the afternoon into the early evening. The primary threats will be strong gusty winds, small hail, and locally heavy rainfall, which may lead to ponding of water in low lying areas. Currently, the Storm Prediction Center has placed our entire region in a slight risk (level 2 out of 5) for severe thunderstorms today.
Below is a simulated radar for this afternoon (noon-11pm):
Today’s Storm Prediction Center Convective Outlook:
Today’s projected 2 pm heat index values:
Another hot day with more humidity than yesterday is expected today across the Hudson Valley. Highs in the upper 80s, approaching 90° along with dew points in the low 70s will result in an uncomfortable air mass. Heat indexes will range anywhere between 90-95° in valley locations. The Catskills will remain slightly cooler with highs in the mid-80s.
Below are projected heat indexes at 4 pm today:
After a few showers late last night into early this morning, breaks of sunshine are expected, which will help further destabilize an already buoyant atmosphere, setting the stage for scattered afternoon thunderstorms. A few storms may be severe with heavy rainfall and strong gusty winds being the main threats. Current model guidance suggests storms will begin to move into western locations between 3-5 pm and will evolve eastward throughout the remainder of the afternoon and evening. The Storm Prediction Center has placed our entire region in a slight risk (level 2 out of 5) for severe thunderstorms. While not everyone will experience severe weather today, always remember to stay weather aware.
Unfortunately, mugginess and unsettled weather will continue on Thursday, with another chance of afternoon/evening storms.
Below is a simulated radar for this afternoon/evening (1-11 pm):
Today’s Storm Prediction Center’s Convective Outlook: