JUST IN: Severe thunderstorm risk in Juno Beach, Jupiter this afternoon

UPDATE 1:22 p.m.: There is a marginal risk for severe thunderstorms this afternoon as the east and west coast sea breezes collide over northern Palm Beach County through the Treasure Coast.

The National Weather Service in Miami said the biggest concern is for dangerous lightning, but there is also a low risk of wind gusts up to 60 mph with the most robust storms.

Check The Palm Beach Post’s interactive radar before heading home from work to find out what the conditions are for your commute.

Previous story: Near record heat will descend again onto South Florida today with forecasters warning of temperatures soaring past 90 degrees from Miami through Palm Beach County.

Southwest winds from a high pressure system over the Florida Keys will pump more hot, dry air over the Peninsula, pushing the forecast temperature in West Palm Beach to 94 degrees.

That’s just two degrees below the record high of 96 set in 1945 and 4 degrees above what’s normal for this time of year.

The heat index value today could reach into the triple digits, according to the National Weather Service in Miami.

CHECK The Palm Beach Post’s interactive radar.

The temperature reached 90 degrees Sunday at Palm Beach International Airport, which was 5 degrees below the 2002 record. Miami and Fort Lauderdale both hit 94 degrees on Sunday.

Sunday’s 90-degree day in West Palm Beach was the first since a freak, but brief, heat wave hit South Florida in early April, driving the temperature to 90 degrees at PBIA on April 7.

Forecasters are also warning of afternoon thunderstorms as sea breezes from both coasts move inland.

Florida is unique nationally for its sea breeze-initiated thunderstorms from both coasts.

Land heats faster than water, creating a temperature difference that can be as much as 10 degrees.

RELATED: Why Florida’s summer thunderstorms are so unique, deadly

The warmer, lighter air over land rises and flows toward the sea creating areas of low pressure along the coast. The atmosphere compensates by sending in the cooler, moist sea breeze.

In Palm Beach County, the Atlantic isn’t the only body of water creating a breeze. Lake Okeechobee is big enough to create a temperature difference that forces a lake breeze to kick up.

The lake breeze can crash into the Atlantic sea breeze for an atmospheric combustion only Florida can create.

Although a cool front is expected to wash out north of Lake Okeechobee mid-week, it won’t bring temperatures down much.

Daytime highs in the low 90s are forecast through Wednesday, before dipping to 88 in West Palm Beach on Thursday as rain chances increase to 40 percent.

Typical summer thunderstorm patters are expected to persist through the weekend with rain chances hovering between 20 and 30 percent Saturday and Sunday.

There is no tropical activity in the Atlantic basin expected over the next five days.

Colorado State University’s tropical meteorology project revised its April hurricane forecast last week, calling for a more normal season.

The forecast in April was for a slightly more active season than normal.

Including Alberto, CSU is now calling for 14 named storms, six hurricanes and two major hurricanes.

f you haven’t yet, join Kim on Instagram and Twitter.

Heat records “obliterated” in February

February was the warmest on record at all four of South Florida’s official temperature gauges, with Miami and Naples “obliterating” their previous records.

According to the National Weather Service in Miami, last month’s average temperature for West Palm Beach was 75.3 degrees, beating the previous record of 74.4 in 1959.

Meteorologists noted that in 123 years of records at Miami, the fact that the temperature had never been above 74.9 is “quite significant.”

Today could break another heat record in West Palm Beach.

The official forecast at Palm Beach International Airport is for 89 degrees. If that holds true, that would break the previous high of 88 in 2011.

Forecasters in Miami said the timing of a cold front approaching South Florida will be the deciding factor. If the cold front is delayed, the sea breeze coming from the east kicks in this afternoon, it would mean cooler temperatures today.

The real force of the cold front won’t be felt until late Friday into Saturday.

Overnight heat records broken, why it’s not cooling off

Overnight temperatures have remained in the 80s at Palm Beach International Airport since Friday, breaking a record, tying another and working on a third. 

The normal overnight low for this time of year is 76 degrees, meaning five days of low temperatures that have been six days above normal.

Sunday’s low temperature only dipped to 82 degrees, breaking the 81-degree overnight warm record for that day set in 1963.

Check The Palm Beach Post radar map.

Monday’s low nearly bottomed out at 84 degrees, but a brief overnight shower lowered it to 82, which tied a 1980 record.

And this morning, the low also dipped to just 82 degrees. If that holds through midnight, it will tie a 1928 record.

Warm sunrise in West Palm Beach Tuesday, Aug. 8, 2017 when the overnight low dipped to just 82 degrees.

“We haven’t been lowering much overnight so by the time we get to the early morning, it’s still pretty warm and it just keeps getting warmer,” said Maria Torres, a meteorologist with the National Weather Service in Miami.

European heat wave called Lucifer: What should we call South Florida’s?

Torres said a persistent area of high pressure has meant warm southeast winds blowing in all night long and subsidence – sinking air that warms from compression as it falls.

Download the Palm Beach Post WeatherPlus app here.

Also, a lack of afternoon thunderstorms means no kick start to cooling as evenig approaches. Torres said the storms have missed coastal Palm Beach County as southeast and east breezes push them further inland.

That pattern should switch Thursday and Friday when a weak tropical wave approaches South Florida and rain chances go up to 50 percent.

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.

 

JUST IN: Hottest day of the year with heat index of 107

Today marked the hottest day of 2017 with 94 degrees measured at Palm Beach International Airport and a heat index of 107.

There have been five 93-degree days this year, including three in May.

The mercury only peaked at 94 briefly Friday between 1 p.m. an 2 p.m., with the 107 “feels like” temperature lasting about the same amount of time.

Check The Palm Beach Post radar map.

The 94 degrees is four degrees above what’s normal for this time of year, but doesn’t beat the 1950 record high of 97 degrees.

The weather pattern is expected to shift into the weekend with rain chances increasing to 60 percent Sunday. High temperatures Saturday and Sunday will remain in the low-90s, but slip into the high 80s on Monday.

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.

BREAKING: Heat advisory canceled in Palm Beach County

The National Weather Service canceled the heat advisory for Palm Beach County, noting dew points were not high enough to reach alert level. A heat advisory is issued when the forecast calls for a heat index of 108 degrees for two hours or more.

The heat index, or “feels like” temperature, at Palm Beach International Airport was 105 degrees at 3 p.m.

Previous story: The National Weather Service has issued a heat advisory for Palm Beach County as heat index temperatures soar into the triple digits today.

The advisory is in effect until 6 p.m. tonight.

Related: The last time it hit 100 degrees in West Palm Beach. 

“Today looks to be the hottest day of the year so far,” National Weather Service meteorologists said this morning. “The stage is set for a dangerously hot day.”

Temperatures are expected to reach 94 degrees in West Palm Beach today, with a heat index as high as 110 degrees. Parts of Miami-Dade and Collier counties could see a heat index soar to 113 degrees.

Check The Palm Beach Post radar map.

Today’s heat advisory is the first for Palm Beach County since July 2016, which was the first in seven years.

 

Heat advisories are issued when the heat index, or “feels like” temperature is forecast to be 108 or higher for at least two hours.

Part of the blame for the string of warm days goes to the Bermuda High. Its push of east to southeasterly winds sends cooling afternoon thunderstorms into the interior of the state as opposed to allowing them erupt at the coast.

Download the Palm Beach Post WeatherPlus app here.

The high also means air is sinking. That sinking air warms by compression as it falls, working to evaporate clouds and allow for more sunshine.

“But the falling air doesn’t dry out the surface,” Thomas said. “If you get just a slight sea breeze, you’ll get the moist air, and that’s what will get the heat index up there.”

Today’s heat advisory includes all of South Florida. On Tuesday, there was a heat advisory for Miami-Dade and Collier counties.

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.

Get ready for the heat, advisories possible this week

The National Weather Service in Miami is forecasting peak temperatures in the mid-90s Tuesday with heat indices approaching 108 degrees as the subtropical ridge digs in.

Meteorologists wrote in their morning discussion that heat advisories may be necessary Tuesday in areas with climbing “feels like” temperatures.  The NWS will issue a heat advisory if the index is expected to be 108 or higher for two hours.

Check The Palm Beach Post radar map.

Forecast for Palm Beach International Airport

In West Palm Beach, the high is forecast to reach a scorching 93 degrees. That’s 3 degrees above normal, and ties the hottest temperature recorded so far this year.

The mercury also reached a freak 93 degrees on May 3.

Related: The last time it hit 100 degrees in West Palm Beach.

The record high for July 25 in West Palm Beach is 98 degrees set in 1912.

While it’s unlikely that record will be broken, the overnight temperature of 82 degrees may be challenged. The forecast low is expected to only fall to 80 degrees.

Download the Palm Beach Post WeatherPlus app here.

Here are other Palm Beach County forecasts for today and Tuesday:

Wellington

Jupiter

Boynton Beach

Boca Raton

Palm Beach Gardens

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.

 

It’s steamy out there, decades-old heat records broken across South Florida

It’s not just western states breaking heat records.

As Tropical Storm Cindy buzzes ashore in southwestern Louisiana, warm, juicy air is getting pumped into on southeast winds Florida from a high pressure system sitting over the Carolinas.

That’s made for some sultry overnight low temperatures that broke records in West Palm Beach, Miami and Naples.

Check The Palm Beach Post radar map.

Satellite image Tropical Storm Cindy June 22, 2017

West Palm Beach broke or tied two records. On Tuesday, the low temperature dropped only to 81 degrees, which broke a 1993 record of 79 degrees.

On Wednesday, the low hit only 82 degrees, tying a 2010 record.

Miami’s temperature dropped to 82 degrees on Tuesday, breaking a 1920 record of 81.

Download the Palm Beach Post WeatherPlus app here.

And in Naples, the overnight low Tuesday hit 80 degrees, breaking a 1968 low of 79.

Forecasters at the National Weather Service in Miami expect the heat to continue through the weekend with daytime highs reaching near 90 degrees and a heat index – feels like temperature – closer to 105.

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.

Sunrise Feb. 13, 2017 over Palm Beach

With record highs out west, why doesn’t it reach 100 in South Florida?

A heat wave is cooking the southwest, with the temperature in Phoenix reaching 119 degrees Tuesday, and Las Vegas hitting a blistering 117 degrees.

Needles, Calif., tied its all-time record high Tuesday when it soared to 125 degrees.

But the west doesn’t have a monopoly on triple-digit temperatures.

Although rare, South Florida can reach temperatures of 100-plus degrees.

Check The Palm Beach Post radar map.

David Zierden, Florida’s climatologist, said Miami has only recorded one day where the temperature reached 100-plus degrees.

That was on July 21, 1942 when Miami recorded 100 degrees.

West Palm Beach reached 101 that same day.

But the National Weather Service in Miami said West Palm Beach hit 100 degrees on three previous days:

  • June 20, 1921
  • July 2, 1927
  • July 3, 1927

“In South Florida, hitting 100 degrees is quite rare,” Zierden said. “Due to the surrounding Atlantic Ocean and Gulf of Mexico, and the prevailing easterly trade winds, afternoon high temperatures are moderated in South Florida.”

The Southeast Regional Climate Center has the following cities with their record high temperatures for each month. In West Palm Beach the records only go back to 1940.

The average number of days for West Palm Beach to reach a maximum temperature of 95-plus is 3.73, but in 2011, there were a whopping 28 days of 95 degrees or higher.

Download the Palm Beach Post WeatherPlus app here.

West Palm Beach days with 95-plus temperatures.

Andrew Hagen, a meteorologist with the National Weather Service in Miami, said temperatures in the Everglades reach 100 degrees at least once each summer.

Zierden said it’s more common for North Florida and the Panhandle to hit 100, or higher.

Those areas are more prone to extreme heat, especially when under a high pressure system, which has sinking air warmed by compressional heating and cloudless skies. Prevailing northwesterly winds that flow across the continent also help hike the temperatures as the wind flows over warming land.

Tallahassee averages 19.3 days of 95-plus degree maximums.

Orlando hit the 100-degree mark on June 18, 2015 – the first time the area recorded a triple-digit temperature in 17 years.

National Weather Service meteorologist Arlena Moses, told the Orlando Sentinel at the time, that daily thunderstorms in the summer typically cool things off before temperatures can reach 100 degrees.

On record, Orlando has only been 100 degrees or warmer 30 times, according to the Sentinel article.

Orlando’s all-time high temperature was 103 degrees, set Sept. 8, 1921.

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.

JUST IN: Weekend heat records broken across South Florida

It was a warm weekend, both during the day and even after the sun went down.

On Sunday morning, temperatures broke or tied heat records throughout South Florida as overnight lows really didn’t drop that low.

At Palm Beach International Airport, the temperature dropped only to 79 degrees, tying the previous “record high minimum” temperature set for June 11 in 2012.

That’s a full 5 degrees above normal for West Palm Beach, where the typical overnight temperature this time of year drops to 74 degrees.

In Miami, the low temperature Sunday morning only dipped to a balmy 82 degrees, breaking the previous record of 80 degrees set in 2010.

And in Naples, the low temperature fell to 78 degrees, tying the old record of 78 degrees set in 2010.

This morning, West Palm Beach may be on the way to breaking another overnight heat record. As of 7:30 a.m., the hourly temperature dipped to just 81 degrees, which would tie a 2015 record.

As of 2 p.m., the high in West Palm Beach today was 87 degrees. The normal high temperature is 88 degrees.

Sunrise over Palm Beach Monday, June 12, 2017.

Update: Wednesday will be a scorcher ahead of severe weather threat

The National Weather Service is forecasting temperatures near 90 and afternoon storms in West Palm Beach today, but things heat up even more Wednesday ahead of an unusually late cool front.

Wednesday’s daytime high could be a scorching 94 degrees.

That’s abnormal even for August in South Florida and a full seven degrees above what’s normal for May 24. The record high temperature for the day is 96 degrees set in 1917.

Check The Palm Beach Post radar map.

The late May cool front, which is likely the last of the year, will be switching the winds to the south-southwest on Wednesday, sucking up deep tropical moisture and turning up the heat.

Parts of Palm Beach County from Jupiter southwest to suburban Boca Raton, and including west to Lake Okeechobee, are under a slight threat of severe weather. That means a moderate threat of damaging winds 60 mph or greater, hail up to quarter size and isolated tornadoes.

While the exact timing of the turbulent weather is dependent on how swiftly the front advances, meteorologists were forecasting Wednesday afternoon into Thursday as its likely window of opportunity.

“This is more than the normal Florida thunderstorm,” said Kenneth Clark, an expert meteorologist with AccuWeather. “It’s out of the ordinary kind of stuff because it’s late for something to get this far south.”

Download the Palm Beach Post WeatherPlus app here.

And it has an extra spark — a screaming jet stream running at 150 mph over Florida is forecast to smack into deep tropical moisture flowing in from the south-southwest. That warm, buoyant air rising quickly into cold air aloft can cause combustion in the form of thunderstorms.

It also has the making for hail if thunderstorm updrafts are strong enough to suspend raindrops in the upper atmosphere long enough to freeze.

“It’s probably the last front of the year of this magnitude,” said Tim Sedlock, a meteorologist with the National Weather Service in Melbourne. “It has some upper-air support and that’s somewhat unusual for this time of year. We’ll also have deeper moisture across the area with higher precipitation rates.”

Rain chances Wednesday are 40 percent increasing to 70 percent in the evening.

The Weather Prediction Center has southeast Florida getting between 0.50 inches and 1.25 inches of rain Wednesday into Thursday. But meteorologists don’t believe flooding will be a problem because the ground is so dry.

If you haven’t yet, join Kim on Facebook, Instagram and Twitter.