A relatively significant flood is unfolding over the southeast, with the worst of the flooding likely to occur along the Georgia and South Carolina coastlines.
Rainfall amounts may reach over 10 inches over coastal South Carolina, with the heaviest amounts falling near and around the city of Charleston.
Two powerful wintry storms will be affecting the United States from coast to coast this week...
The first system is currently organizing itself over the Rocky Mountains region, and will begin to really get its act together tomorrow as its center moves into Kansas.
5:00 PM Radar (November 2nd 2019)
As this storm marches northeastward, it will drop a wide swath of 6-12 inches of snow stretching from Colorado to Ontario, with localized amounts up to 20 inches possible, especially in northern Wisconsin and the upper-peninsula of Michigan.
Areas in and around the snow swath will receive strong winds with widespread gusts of over 40-50 mph across many of the Great Plains and Midwestern States. Winds may gust over 60 mph directly along the Great Lakes shores.
This system will bring some rain, snow, and wind to the Northeast Wednesday night, before exiting off the coast Thursday. As it strengthens off the coast Nova Scotia will be brushed by nor'easter conditions.
18z High-Resolution NAM 10:1 Snowfall Accumulation [60 hours] (November 2nd 2019)
Our next storm, which has the potential to dump even more snow, will rapidly intensify in the Northeast Pacific tomorrow night, before slamming into extreme southwestern Oregon tomorrow night with a pressure near 970 mb. It is looking increasingly likely that a sting jet will accompany this storm, which could result in significant wind damage in coastal areas near the California/Oregon border.
18z High-Resolution NAM Sustained Wind Speeds in Knots [9 PM Tuesday] (November 2nd 2019)
This system will slow down once it moves over land, and dump feet of snow over the Cascades, Sierra Nevada and Rocky Mountain ranges. As it stalls, it will likely combine with a second piece of energy Thursday night, and may rapidly intensify again over the Great Plains Friday. Widespread snow across the Great Plains and Midwestern regions of the United States is possible again, with even stronger winds possible. Its even looking possible that this storm may transfer its energy off the coast Sunday night, and strengthening into a classic nor'easter.
December is shaping up to be quite wintry and exciting for the continental United States! There isn't any clear end in sight to this very dynamic pattern, with many more storm chances on the horizon...
Its clear that winter is coming as both the American and European models are indicating wintry weather in the coming weeks for the eastern two thirds of the nation.
First, the European. The European has consistently been indicating a shot of cold air hitting the Northeast this upcoming weekend, but during its 12z run, it showed something even more interesting.
12z ECMWF Snowfall (November 2nd 2019)
A swath of 6 to 10 inches of snow stretching from Erie, Pennsylvania to Boston, Massachusetts. If this scenario were to verify, precipitation would begin as rain for most areas Thursday afternoon, and with nightfall should transition to snow with several inches of heavy wet snow, accumulating by Friday morning. This is the first model run to indicate a storm like this happening, so it remains highly unlikely for the time being. However, its definitely something to watch.
The American model does not support a winter storm developing this Thursday, but does indicate a highly powerful winter storm in the long range, with an extremely potent arctic blast behind it.
12z GFS (November 2nd 2019)
Although its very unlikely this verifies as well, it is indicative of the pattern that we could be heading into. November is shaping up to be a rather interesting month weather-wise!
With winter fast approaching, I thought it would be a good time to look at the global sea surface temperature anomalies.
Sea Surface Temperature Anomaly (October 19th 2019)
The first thing that can be seen in the latest Sea Surface Temperature Anomalies just how unusually warm most of the globe is. Of course there are still cool spots, most notably off the west coast of Sumatra, but the majority of the worlds oceans are unusually warm. The most extreme anomalies look to be near the Arctic with the Bering Sea, Northern Pacific, Labrador Sea, and Baffin Bay, all ranging from around 2-5 Celsius above normal. Consequently, the Arctic has not increased its ice cover much at all since it reached its minimum in mid-September. In fact, no other season has had a lower Arctic Sea Ice Extent for this time of year in recorded history.
Arctic Sea Ice Extent Graphics Courtesy of the National Snow and Ice Data Center (October 19th 2019)
Moving over to the equatorial Pacific, ocean temperatures are running only slightly warmer than average. This slight anomaly is not warm enough to classify as El Nino, so this means we are currently in a neutral ENSO state. This neutral ENSO state should continue through winter and into the Spring, but a weak El Nino could develop some time in the next 3-12 months.
International Research Institute for Climate and Society ENSO Model Predictions (September 19th 2019)
A neutral ENSO typically results in a cold winter in the Northeast and Midwest, with warm temperatures in the Southeast and Southwest. Precipitation varies, but a neutral ENSO often results in increased precipitation in the Southeast.
Despite this, NOAA's forecast for December through February indicates above average temperatures for almost the entire continental United States, and increased precipitation not in the Southeast, but in the Midwest.
Three-Month-Outlook for temperature (top), and precipitation (bottom), for the months of December, January, and February courtesy of NOAA (September 19th 2019)
A myriad of factors goes into creating seasonal forecasts, and these NOAA forecasts are by far the best resource one can find. A full list of three month weather outlooks can be found here : https://www.cpc.ncep.noaa.gov/products/predictions/long_range/seasonal.php?lead=2
Have a great night!
Hurricane Dorian was an extraordinary storm and has certainly supplanted itself in the meteorology history books.
Dorian Wind Swath
Dorian reached its peak intensity right as it made landfall on Abaco Island in the Bahamas. Its highest sustained wind speeds were 185 mph which ties Dorian for the second highest wind speeds of any Atlantic tropical cyclone. The only storm on record to have higher sustained winds than Dorian was Hurricane Allen. No storm has been recorded to make landfall with higher sustained winds than Dorian, however, the 1935 Labor Day Hurricane did make landfall with equal sustained winds.
Category 5 Hurricane Dorian (September 1st 2019)
It can get tricky when comparing historical hurricanes by sustained winds because of how difficult and often inaccurate wind speed measurements are. Dorian made landfall with a barometric pressure of around 910 mb, which places Dorian as fifth in lowest pressure at landfall. Personally, I am always more interested in the barometric pressure of a cyclone, as I see it as a a more reliable and all-encompassing number for quantifying cyclone intensity as supposed to peak sustained winds.
Hurricane Dorian's damage to Abaco and Grand Bahama Island is really unprecedented. The people that live on these islands are used to hurricanes, but no storm has ever hit these islands as bad as Dorian did. Some areas on Grand Bahama island were stuck being affected by the eyewall of Dorian for 22 hours. There really isn't a documented case of such a powerful hurricane stalling at such an intensity over a landmass, and the death and destruction this must have caused is really unimaginable. The government of Bahamas is saying that the best way to help out is to find a reputable charity and donate money, not goods, as money will allow for more flexibility during the recovery process.
I'll have a winter forecast weather discussion out saturday.
Dorian really went crazy today, and despite already being a category five hurricane this morning, it rapidly intensified once again and became an even stronger category five hurricane. Dorian made landfall on Abaco Island in the northern Bahamas earlier this evening, with peak sustained winds of 185 miles per hour, and is currently making its second landfall over Grand Bahama Island as a 180 mile per hour storm.
Dorian's 185 mph landfall tied it with the 1935 Labor Day Hurricane for the title of the highest winds of any Atlantic hurricane at landfall. Despite having equal wind speeds, the 1935 hurricane had a pressure of just 892 millibars at landfall, and Dorian's pressure was 910 millibars. Since measuring air pressure is much easier and more accurate than measuring wind speeds, its very possible that many of the older storms like the 1935 Labor Day hurricane could have had much higher winds. Some meteorologists even speculate that the 1935 hurricane could have had winds over 200 mph.
Although wind is ultimately derived from pressure, its unclear whether the true impacts of a storm is most affected by air pressure or wind speeds. An interesting example would be Hurricane Katrina, which made landfall as a category 3 hurricane with an unusually low barometric pressure of 920 millibars, which could've contributed to Katrina's devastation.
I know that when I'm following any kind of cyclone, I'm always more impressed with air pressure than windspeed. Barometric air pressure is so much more reliable, as wind speeds for tropical cyclones are typically a very educated guess.
Major Hurricane Dorian (September 1st 2019)
Dorian is doing catastrophic damage to the northern Bahamas and the footage coming out of Abaco Island is reminiscent of Barbuda when Irma struck in 2017. The damage to Grand Bahama Island could be even worse as Dorian is beginning to stall over the island. Over 20 inches of rain is expected to fall on the island as Dorian stalls over the next 12-24 hours. This would typically cause a disastrous amount of flooding, but since virtually the entire island is under 30 feet of elevation, almost everywhere will be covered in storm surge and any flooding caused by rainfall will be unnoticeable.
WPC 120 hour Rainfall Forecast for Hurricane Dorian (September 1st 2019)
Dorian's approach to Florida continues to be an incredibly close call. Hurricane warnings have been posted which is great, because a lot of Floridians really believed they were in the clear when the weather models trended out to sea two days ago. If there is a Florida landfall, which there very well could be, there is still another 36 hours, so there is some time for final evacuations if need be. By far the most at risk area in Florida looks to be the Cape Canaveral Area of Florida. This is where Dorian should make its closest approach to the Sunshine State.
National Hurricane Center Cone of Uncertainty for Dorian (September 1st 2019)
Wednesday and Thursday Dorian will impact the rest of the southeast and then the northeast and Canadian Maritimes could be affected Friday and into the weekend. Considering how unclear a Florida landfall is at this point, discussion of impacts in other states is pure speculation.
Tropical Storm Dorian has developed, and its intensifying as it nears the Caribbean.
Tropical Storm Dorian (August 26th 2019)
Barbados will be the first to be affected by Dorian, with a direct landfall on the island occuring tonight. A tropical storm warning has been posted for the island. By tomorrow afternoon, Dorian will enter into the Caribbean Sea, but not before a potential landfall on St. Lucia. A hurricane watch has been posted for St. Lucia in addition to a tropical storm warning. Martinique and St. Vincent are under tropical storm warnings and will be affected. However, it is looking likely that Dorian will make its closest approach to Barbados, and St. Lucia.
National Hurricane Center 5-Day Cone for Tropical Storm Dorian (August 26th 2019)
As Dorian moves northwestward through the Caribbean Sea, the National Hurricane Center predicts that it will intensify into a category 1 hurricane. This is interesting, because many of the weather models do not show much intensification in the next 48 hours. Despite this, the National Hurricane Center continues to refer to their own forecast "conservative." It does make sense for Dorian to intensify into a hurricane, and if it does, it will be a testament to just how important people are in the weather forecasting process.
12z Spaghetti Models (August 26th 2019)
Although intensity with Dorian is up in the air, the models are showing an unusual amount of consistency on track. Normally the spaghetti models are not in as good agreement as they are above. Once Dorian moves out of the Caribbean Sea, it will track through the Bahamas, and then likely move towards the southeastern United States. It is very unclear at this time how strong Dorian could become once north of the Carribbean, and it is largely dependent upon how much land interaction Dorian experiences with Hispaniola.
Hispaniola Elevation Map
Hispaniola is a mountainous country, and it is notorious for disintegrating any tropical cyclone that moves over it. However, models are suggesting that Dorian may be able to stay east of Hispaniola, and will either move over Puerto Rico or could escape through the Mona Passage. Additionally, if Dorian were to make landfall in Hispaniola, it would likely make landfall in the eastern part of the Dominican Republic, which is significantly less mountainous then the western and central parts of the island.
Hispaniola will not be the only inhibiting factor for Dorian's intensification. Dorian has been able to insulate itself from dry air so far, but its possible that dry air begins to affect its intensification.
It appears that the Atlantic is finally getting started this hurricane season. With only two weeks until the statistical peak of hurricane season, theres still lots of time for many more storms to come.
Yet another week has passed with zero tropical development in the Atlantic, and the National Hurricane Center is still forecasting no new tropical development in the next five days.
National Hurricane Center 5-Day Outlook (August 15th 2019)
The last named storm in the Atlantic basin was Barry which dissipated on July 14th. If the NHC is correct with their five-day outlook, this would be the first time since the 1982 hurricane season that there was no named storms between July 14th and August 19th. The 1982 hurricane season ended up being well below average, with only two hurricanes, one of them major, and zero hurricane landfalls from any Atlantic basin cyclones. The accumulated cyclone energy of the season was a measly 32.
1982 Hurricane Season
The two hurricanes that did develop during the season were rather interesting storms. Hurricane Alberto which developed in the southeastern Gulf of Mexico did not make a single landfall, which is unusual because once storms move into or form inside the Gulf of Mexico they almost always make a landfall. The other hurricane, Hurricane Debby, reached category 4 status farther north than any other hurricane recorded in the Atlantic.
Despite this unusual quiet period of Atlantic activity, its still possible for the season to become active. 85% of named storms form after August 15th after all. Also, although this season has had a similar amount of activity as 1982, unlike 1982, the ENSO status is La Nina, and is becoming even more La Nina. The National Hurricane Center and Colorado State University both issued midseason outlooks at the start of the month, and both organizations still called for an average to above average season.
However, everyday that passes with no tropical cyclones in sight, the chance of a below average season increases. Additionally, a La Nina weather pattern will not magically make the cyclones develop, and there has been low activity La Nina hurricane seasons, namely 1973 and 1974 which both featured well below normal accumulated cyclone energy and a strong La Nina pattern throughout.
Have a good night and enjoy the quiet weather!
The Atlantic remains stormless, with no new tropical cyclones expected in the forecastable time frame.
National Hurricane Center 5-Day Outlook (August 6th 2019)
The last tropical cyclone in the Atlantic basin was Hurricane Barry which made landfall July 13th and dissipated on July 14th. Barry's most noticeable impact was its rainfall. However, shear and dry air on the north side of Barry, prevented a flooding event of Florence or Harvey magnitude. Nevertheless, a rainfall total of 16.59 inches was recorded near Dierks, Arkansas, which made Barry the wettest tropical cyclone in Arkansas history.
Hurricane Barry at landfall (July 13th 2019)
This "infamous" map has been circulating twitter recently. Five states have broken their tropical cyclone precipiation records in the last three years. Including Texas with Hurricane Harvey, Hawaii with Hurricane Lane , North Carolina with Hurricane Florence, South Carolina with Hurricane Florence, and most recently, Arkansas with Hurricane Barry. Climatologists theorize that this trend of extremely wet tropical cyclones is a result of anthropogenic global warming.
No Atlantic named storm activity has happened between the period of July 15th to August 6th three times in the last twenty years. Those seasons were 1999, 2009 and 2015 and all three of these seasons yielded hurricanes of category 4 strength. The 1999 season was particularly extreme, yielding an impressive accumulated cyclone energy of 177, and four category 4 hurricanes, including the historic Hurricane Floyd. The statistical peak of hurricane season is still over a month away, and theres plenty of time for a pattern change in the Atlantic.
1999 Atlantic Hurricane Storm Tracks + Timing
Tropical activity in the eastern Pacific has been fairly active this year with two category 1 hurricanes and two category 4 hurricanes forming. There is yet to be a single landfalling tropical cyclone in the east or central Pacific. Those two category 4 hurricanes were Hurricane Barbara and Hurricane Erick, Hurricane Barbara being the stronger of the two falling just short of category 5 strength.
Yesterday, August 5th, saw the death of not one, not two, but three cyclones in the pacific, with Hurricane Erick, Hurricane Flossie, and Tropical Storm Gil all degenerating into remnant lows.
The NHC is not anticipating any tropical cyclone activity in this basin in the next five days, however, models are suggesting increased activity next week.
American and European weather models both show increasing tropical activity in the central and eastern pacific during the latter part of next week.
Things are even more exciting in the western Pacific with Typhoon Francisco making landfall early yesterday morning in southern Japan as a category 1 typhoon.
Typhoon Francisco radar and satellite imagery upon landfall (August 5th)
Up to four inches of rain an hour fell in some areas in the Kyushu province of Japan. Overall the damage from the storm is not extreme as this region is fairly used to these typhoons.
Typhoon Francisco weakened to a tropical storm after landfall and made a second landfall as a tropical storm in South Korea this morning. Francisco will transition into an extratropical low over the Sea of Japan, then move over Hokkaido, and then finally move towards the Bering Sea.
Tropical Storm Francisco Cone
Two more tropical cyclones are spinning to the south of Francisco.
Both Typhoon Lekima and Tropical Storm Krosa are expected to intensify over the next 48-72 hours. Lekima will likely develop into a major hurricane and make landfall anywhere from northern Taiwan to southwestern Japan. Right now, it is looking most likely that Lekima makes landfall somewhere in mainland China, possibly near Shanghai, and then heads into Korea likely as a weak tropical storm. There is also a possibility that Lekima makes its first landfall in Korea. Lack of land interaction could mean that Lekima could hold typhoon strength, even if it made landfall as far north as South Korea. Tropical Storm Krosa is less of a threat to land, but there is a slight risk of a Japanese landfall near where Francisco made landfall.
Lekima is definitely a storm to watch with models indicating a rather unusual and potentially dangerous track for East Asia.
18z GFS ensemble tracks for Typhoon Lekima (August 6th)
Its good to be back and blogging :) Don't know if anyone is reading this but I'm just happy to do anything involved with wondrous world of meteorology.
After days of much warmer than average temperatures the cold is coming, and with it snow...
Rain should move into our area between 8 and 10 PM tonight. As the rain moves in temperatures will drop rapidly from 60s to 50s to 40s and down into the 30s. As the rain increases in intensity, it will mix with heavy, very wet snow. The snow won't be able to accumulate, except for possibly a coating in the higher elevations of Sussex, Passaic and Orange counties.
Tomorrow will be COLD, featuring temperatures in the 30s all day with some wet flurries around.
Monday, Tuesday and Wednesday all look cold, but temperatures should get closer to average Thursday. Be sure to follow my twitter @conweather and follow!