November 5

Record Warmth Central USA – “Eta” Poses Risk to Florida Early Next Week

 

Paddleboarding in November. Not me, no way. I have brave neighbors… (Photo credit: Paul Douglas)

Record 74F in the Twin Cities on Wednesday

“It’s tough to make predictions, especially about the future” New York Yankee Yogi Berra famously uttered.

No kidding. I almost feel bad for the pollsters, with their fancy models and confident projections. Once again they made meteorologists look good, which is hard to do.

Predicting the future is hard, a tenuous mix of art and science. The accuracy of your forecast depends on the quality of data you feed into models, which aren’t perfect, just rough simulations of reality. Weather forecasters deal with this every day. Some models are better than others. We try to adjust for bias – and
acknowledge when confidence levels are low.


Tuesday Records. What’s impressive is that this late-season warm spell is statewide. Tuesday record highs included 70F for International Falls and 69F at Baudette.


75F Wednesday at MSP. It was the third warmest November day on record in the Twin Cities, according to the Minnesota DNR and State Climatology Office.


Old Man Winter Pulling His Punch? Speaking of low-confidence, NOAA’s GFS model forecasts ridging over the eastern half of the USA 2 weeks out, with a potential for significant storms from the Rockies into the Upper Midwest, including Minnesota – maybe a combination of snow and rain? Too early for details.

Briefing: Issued Wednesday, November 4th, 2020:

Tropical Storm Eta

tropical-storm-eta-radar

Eta Inland Over Nicaragua. A very strong Hurricane Eta made landfall yesterday afternoon near Puerto Cabezas, Nicaragua, and has been weakening since. As of 4 AM ET, Eta was a tropical storm with winds of 70 mph located about 90 miles west of Puerto Cabezas. Eta was moving west at 8 mph.


tropical-storm-eta-2-radar


Tracking The Future Of Eta. While Eta will continue to weaken across Central America over the next couple of days – likely a tropical depression by tonight and a post-tropical low tomorrow – life-threatening torrential rains and flooding will continue to occur across portions of Central America, with flash flooding possible as far east as portions of Jamaica and the Cayman Islands. However, even if the surface low fades away, the upper level circulation with the system is expected to survive and could help the system regenerate as it moves back into the northwestern Caribbean Sea Friday. After that point, Eta would begin to strengthen again and could impact portions of Cuba and southern Florida heading into the weekend and early next week with wind and rain. As the second graphic shows, Eta is expected to pass fairly close to southern Florida and the Florida Keys late this weekend or early next week before jaunting westward into the Gulf of Mexico. From there, models have a potential landfall near or along the Florida Panhandle toward the middle or end of next week. Please note there is a sizeable amount of uncertainty in the forecast of this system once we get 3+ days out right now, especially as we’d be dealing with a system that has to regenerate, but facilities across Florida (particularly in southern Florida and the Keys) should continue to monitor the track of this system over the next several days.

D.J. Kayser, Meteorologist.


Category 4 Hurricane Eta Punishes Nicaragua. The New York Times (paywall) has details: “The Category 4 storm threatened much of Central America with winds of up to 140 miles per hour and rainfall that could reach 35 inches in some areas. Forecasters predicted that Hurricane Eta, whose eye began making landfall along the Caribbean coast of Nicaragua midafternoon Tuesday, would rapidly lose power as soon as the center had fully moved onshore. By early Wednesday, it was expected to weaken to a tropical storm as it carved a path through northern Nicaragua, and weaken further to a tropical depression by Wednesday night as it moved into southern Honduras, the National Hurricane Center in Miami said on Tuesday afternoon…”
Tuesday night IR image: AerisWeather.

More Durable Radars Are Needed For an Era of Stronger Hurricanes. Dr. Marshall Shepherd reports for Forbes: “…According to University of Miami hurricane expert Brian Mcnoldy, Hurricane Zeta marked the fifth landfall during the state, three of which were hurricanes. In August, Hurricane Laura (2020) knocked out the National Weather Service radar at its Lake Charles office. Unfortunately, the same region faced threats from Hurricanes Delta (2020) and Zeta (2020), respectively, after Laura. As I sit at my computer tracking an unprecedented Hurricane Eta (yep, Eta), strong and rapidly intensifying storms in recent years raises the following question for me: Do we need more durable weather radar infrastructure for an era of stronger hurricanes?…”

Image credit: “NEXRAD Doppler radar in Puerto Rico after Hurricane Maria.” NOAA Climate.gov.


Moderate to Strong La Nina Event Develops in the Pacific. BBC News has an update: “…There is a 55% chance of the conditions persisting through the first quarter of next year. While a La Niña event normally exerts a cooling influence on the world, this is unlikely to make too much of a difference to 2020. “La Niña typically has a cooling effect on global temperatures, but this is more than offset by the heat trapped in our atmosphere by greenhouse gases,” said Prof Petteri Taalas, from the WMO. “Therefore, 2020 remains on track to be one of the warmest years on record and 2016-2020 is expected to be the warmest five-year period on record,” he said “La Niña years now are warmer even than years with strong El Niño events of the past...”


How the Oklahoma Ice Storm Helped Strengthen Hurricane Zeta Beyond Expectations. Here’s an excerpt of a good explainer from Capital Weather Gang: “…The hurricane managed to capitalize on upper-level winds streaming through Texas and Oklahoma generated by an unusually sharp dip in the jet stream for late October. This dip allowed record cold to crash through the northern Rockies and into the Plains, with temperatures up to 60 degrees colder than average and as low as minus-33 degrees. The upper level winds roaring from south to north along the eastern flank of the jet stream dip facilitated diverging air flow above and out ahead of the hurricane. This encouraged air to rise, cool and condense into clouds and precipitation, and led to an increase in thunderstorm intensity within Hurricane Zeta, which overwhelmed anything that might inhibit it...”

Image credit: “Visible satellite image from Wednesday showing Hurricane Zeta moving ashore in Louisiana, an ongoing ice storm over Texas and Okla., and smoke plumes from fires in Southern California.” (CIRA/RAMMB).


What Happens When You Fly a Science Plane Through Wildfire Smoke. WIRED.com (paywall) has details: “…Wildfire smoke is made up of two components: gases and particulates. The gases include carbon monoxide and dioxide, while particulates are tiny bits of charred vegetation. When a wildfire burns intensely, its heat drives air upward, carrying all this muck high into the atmosphere, where winds sometimes blow the smoke thousands of miles. Among fire researchers, smoke at the source is known as “fresh,” but after a few hours, it’s known as “stale.” It can be up in the atmosphere for days, getting really stale, during which time the gases and particulates are reacting not only with each other, but also with sunlight and gases already present in the atmosphere. By the time the smoke from West Coast wildfires reaches the East Coast, it’s fundamentally transformed...”

Photo credit: “A bevy of instruments collected mountains of data about the smoke.” Photograph: Hannah Hickey/University of Washington.


Hot or Cold: Weather Alone Has No Significant Effect on COVID-10 Spread. ScienceDaily has the report: “…Research led by The University of Texas at Austin is adding some clarity on weather’s role in COVID-19 infection, with a new study finding that temperature and humidity do not play a significant role in coronavirus spread. That means whether it’s hot or cold outside, the transmission of COVID-19 from one person to the next depends almost entirely on human behavior. “The effect of weather is low and other features such as mobility have more impact than weather,” said Dev Niyogi, a professor at UT Austin’s Jackson School of Geosciences and Cockrell School of Engineering who led the research. “In terms of relative importance, weather is one of the last parameters…”

File image: CDC.


Wrong Way to Transport a Snowmobile: Exhibit A. Bring Me The News has the rather unusual story: “Snowmobiling season is right around the corner, but transporting a snowmobile on top of a car is not the way to get the recreational vehicle where you want it to be. One Minnesota motorist driving a Toyota Corolla found that out the hard way. According to the Wisconsin Department of Transportation, someone driving the small red car had a Polaris snowmobile strapped to the top of the car, with the skis of the snowmobile sticking out horizontally over the left side of the car…”

Photo credit: Wisconsin DOT.


 

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