As expected, we are in for a very wet Saturday. For those keeping track, this will be the 11th Vermont Saturday in a row with at least some rain.
This might well be the wettest of the bunch, though the storms of May 17 might still be the winners of the Saturday rain derby.
The storm coming in is looking wetter, stronger and windier than we indicated in forecasts issued yesterday morning.
The end result is a greater threat of flooding in Vermont than we thought before. Though any flooding later today and this evening would probably be fairly minor. Still it's worth taking seriously.
THE FLOOD RISK
The consensus is the store is going to head up through New Hampshire today. The heaviest precipitation in a nor'easter usually falls just to the west and northwest of the center. That track will tend to focus rain right over Vermont.
Everyone in Vermont should see one to two inches of rain. A few places might get three inches.
Flash Floods
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NOAA's Weather Prediction Center has a slight risk of flash flooding in Vermont today and tonight. That's a level two out of four risk levels. |
As such, NOAA's Weather Prediction Center has increased the risk level for flooding from marginal to slight in Vermont. That means essentially that flooding would still be widely scattered and not widespread, but not as isolated as before.
Most meteorologist don't expect super damaging flash floods. The storms of May 17 dumped torrential downpours over short periods of time, which is the best way to wash out roads and flood homes.
That's why communities like White River Junction, Waitsfield, Warren and Killlington saw so much flood damage that day.
We'll probably get about as much rain today as we did on May 17, but the rain will be spread out through mostly the entire day. It won't come down as hard as it did two Saturdays ago, So it will be more difficult to get these great gushes of water roaring down hillsides.
But, the rain might come down heavily enough at times to mess with culverts, wash out steep driveways and erode the edges of some hilly gravel roads.
River Flooding
Widespread flooding along Vermont's larger rivers isn't expected, but some waterways should come close to flood stage.
As of this morning, none of Vermont's rivers are forecast to actually hit flood stage, though in the end I wouldn't even be surprised if a few did achieve minor flood stage. So nothing devastating there. Places like downtown Montpelier, Johnson, Barre and Cambridge seem safe. But low lying roads could go under water again.
Some examples:
The Otter Creek at Center Rutland is forecast to peak at 7.2 feet, just under minor flood stage by Sunday morning. The Mad River at Moretown, often a flood trouble spot, is forecast to peak at 5.3 feet, well short of the nine foot flood stage. I think that forecast is underdone, though the river will probably still remain below flood stage.
The Winooski River looks safe from flooding at this point, too. The Lamoille and Missisquoi are also scheduled to stay below flood stage. Nevertheless, the National Weather Service is still keeping a close eye on all these rivers, in the off chance there's an unpleasant surprise or two.
This definitely won't be another Great Flood of 2023 or 2024 though, so you can relax about that.
STRONG STORM
Storms, even nor'easters tend to be much weaker in the warm season than in the winter. Nor'easters thrive on sharp temperature contrasts, which makes them those windbags with lots of rain or snow.
There really isn't an enormous temperature contrast feeding the storm but there is more than usual for a May system. Plus there's been a lot of energy in the atmosphere for the storm to work with. As of Friday evening, the storm was forecast to have a central pressure of 984 millibars, for 29.05 or so inches.
That would break low pressure records for a storm at the end of May.
You could tell this storm would be a strange powerhouse before it even formed. The ingredients for the storm were over the Ohio Valley yesterday,. That spun off an unexpected tornado in Kentucky that killed one person and injured about 20.
Tornado warnings blared in parts of the Mid-Atlantic States Friday afternoon and evening, including near Washington DC and Baltimore.
All this energy has not consolidated into the nor'easter that was heading into New England early today.
Though thunderstorms are possible in eastern two thirds of New England today, they are not expected to be severe.
But it will get rather windy here for a late May storm, since the nor'easter will be so strong. Gust could exceed 30 mph, especially on hill and in north/south oriented valleys. That shouldn't be strong enough to cause much in the way of power outages
However, the ground is so wet that the wind might topple shallow rooted trees that would be situated in mud instead of solid ground because of all this rain.
RAINY MAY AND RECORDS
If the rainfall pans out as expected, most stations in Vermont will end up with one of the top 10 wettest Mays on record.
We might also break rainfall record for today's date. Record rainfall for May 31 in Montpelier is 0.99 inches. The forecast total rainfall today in Montpelier is 1.33 inches, so that stands a great chance of being broken.
In Burlington, the record rainfall for May 31 is 1.34 inches in 1998, which means there's an iffier chance of breaking today's rainfall record. The forecast rainfall in Burlington today is 1.17 inches.
As an aside, that May 31, 1998 storm is quite memorable here in Vermont and throughout the Northeast and Midwest.
That May 31, 1998 storm created one of the worst tornado and severe storm outbreaks on record in the Midwest and Northeast. It started with a tornado that killed six people in Spencer, South Dakota.
A severe derecho blasted its way west to east across the entire Great Lakes region. Tornadoes spun up in in Pennsylvania and New York, One of them a strong EF-3, caused extensive damage around Mechanicsville, New York.
That same tornado continued on into Bennington County, Vermont as an EF-2 (very strong for Vermont. The twister traveled east along Route 67 through North Bennington, damaging houses and the campus of Bennington College, before finally dissipating two miles east of South Shaftsbury.
Thankfully, no tornadoes are expected in Vermont and the rest of the Northeast from this odd strong, weirdly out of season nor'easter.
Montpelier, Burlington and other Vermont cities are poised to have one of their top ten Mays on record, but we're unlikely to have THE wettest May on record.
Before the rain started Saturday, Burlington had 4.97 inches of rain so far in May. The wettest May was 8.74 inches in 2013, and we certainly won't have more than three inches of rain in Burlington today. But the 10th wettest May had 5.55 inches, so we should get to at least that.
LOOKING AHEAD
Sunday is also looking a little worse than originally forecast, at least in northern Vermont. A lobe of moisture coming down from Quebec from the departing storm will likely set off numerous, albeit rather light showers Sunday afternoon and night.
Highs Sunday will only be in the 50s, and only near 50 in higher elevation towns in the north, Unlike earlier forecasts, it now seems possible there will be some snowflakes on some mountain peaks, like Mansfield and Jay Peak.
A sharp warmup to summertime levels is still expected in the upcoming week. We'll have to watch for end of the week thunderstorms. With the wet ground, if those storms are slow moving or numerous, that could spell trouble.
It's too soon to say whether that will happen or not, so I wouldn't worry about it for now.