Miguel Pierre

Premium Weekly Outlook: Monday downpours, then drier weather returns, but a cooler weekend?

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A shortwave trough and frontal boundary has move slower into region than previous expected. This has lead to drier conditions through the overnight hours Sunday. But more showers and some steadier bands of rainfall are now over much of the region this morning. Stronger forcing underneath of right-entrance of jet streak and low-level convergence along frontal boundary has increased, along with tropical moisture from the remnants of Julia off the Southeast coast, surge northward along the coast.  Some instability with a deep southwesterly flow is also aiding in development of some thunderstorms scattered or embedded within steadier bands of rainfall over region.

With marginal instability and abundant moisture, the main threat continues to be for torrential downpours with localized flash flooding, especially during the morning and early afternoon hours. Much of the area will likely receive near or 1.00” of rainfall. However, some showers and thunderstorms could train along and axis of unidirectional shear, convergence, and precipatable water values near over 2.00”, along or just ahead of the frontal boundary today. Areas at greatest risk for flooding will over poor drainage and low-lying areas. Some ponding on area roadways, especially likely as well. Significant flooding from rivers and streams isn’t anticipated due to drier conditions over the last few weeks.

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Miguel Pierre

Premium Weekly Outlook 5/23 – 5/29: 80+ Degree Temperatures by Wednesday…More T-Storm Chances?

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Some unsettled weather will start off this week with a cut-off low tracking in the region. But much warmer and drier conditions will finally arrive with temperatures soaring well into the 80s away from the shore by Wednesday and Thursday. The main question remains: will this warming trend to continue into the Memorial Day weekend, or is more cooler/ unsettled weather with showers and thunderstorms in store? We discuss more technical details and thoughts with the upcoming weather this weekly period.

So far — Monday began with plenty of sunshine as weak high pressure temporarily built into the region.  Despite a northeast flow, deep mixing will help temperatures today to rise in the middle to upper 70s.  This brings our temperatures to slightly above average for late May. Closer to the south-facing shores,  temperatures will be cooler with sea-breezes developing and pushing inland later this afternoon.

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Miguel Pierre

Premium Weekly Outlook 5/16 – 5/22: Moderation to around average temperatures late week

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After some cooler temperatures today and then some more unsettled weather for Tuesday and Wednesday, moderating temperatures to near normal with pleasant weather returns late this week. But there is a potential fly in the ointment for a warming trend to continue this weekend as a coastal storm may try to develop. For this weekly outlook, we’ll discuss some technical details and thoughts on the weather through this week and this coming weekend.

After a very chilly start with temperatures near record lows across the region, temperatures today should be a little warmer than Sunday’s high temperatures with slightly warmer mid-level temperatures, deep mixing and more sunshine in the afternoon. High temperatures should rise into the lower to middle 60s for much of the region today. A tight pressure gradient and winds around 40kts on top of a deep mixed layer will also cause west-northwest winds to gust between 30mph and 40mph again today. The west-northwest winds will also keep sea-breezes from developing this afternoon for coastal locations.

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Miguel Pierre

Premium: Tropical forcing likely to support warmer late May pattern

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Cooler temperatures are on their way tomorrow and early next week with a large anomalous upper-level low moving over the Northeast. Some waves along a stalled frontal boundary may also affect the weather during the middle of next week. But we are still anticipating warmer temperatures in late May.  We have already discussed a number of reasons why we believe more warmth is on the way. But a major influence in this pattern shift will likely be tropical forcing from an active MJO event occurring over the Indian Ocean now.

First, the ensembles guidance still show the AO/NAO turning positive with more troughiness over Greenland/Davis Strait. This will not support as much troughiness, nor an upper-level low over the Northeast or Southeast Canada. Also a -PNA pattern will be developing with troughiness digging over the Southwest US. This will causes heights to build over much of the Central and Eastern United States.

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