Showing posts with label tropical storm. Show all posts
Showing posts with label tropical storm. Show all posts

Tuesday, September 13, 2016

Active Tropics: Ian and Julia in the Atlantic, Orlene in the Eastern Pacific, Meranti near Taiwan

Two tropical storms in the Atlantic, a hurricane in the eastern Pacific, and a super typhoon and tropical storm in the western Pacific - pretty much describes September in the tropics. Let's start in the western Pacific with Meranti.

SUPER TYPHOON MERANTI



This is Super Typhoon Meranti. It has just passed by (as of 9 PM CDT/02Z) the southern tip of Taiwan. It is starting to weaken as the eye of Meranti is starting to become covered in clouds and is cooling (brighter colors). Generally, for a healthy tropical cyclone, you want cold-topped thunderstorms with a warmer eye. The greater the contrast between the thunderstorms near the center and the eye, the stronger the tropical cyclone is. Also, interesting fact: earlier today, Meranti became tied for 2nd for the strongest winds estimated for a typhoon in the western Pacific with winds of 190 mph. The strongest winds estimated for a typhoon were 195 mph from Super Typhoon Haiyan in 2013. Satellite estimation is most common with systems that are over open waters and away from any observation sites. The most common satellite estimation techinique is the Dvorak method. You can read more about it here. The strongest winds ever recorded for a tropical cyclone, period, was Hurricane Patricia with sustained winds of 215 mph! Here is the latest (7 PM CDT/00Z) advisory information from the Joint Typhoon Warning Center:


Meranti was located at 21.6 N, 120.7 E, moving NW at 15 mph. The maximum sustained winds (estimated by satellite) were 180 mph, making Meranti a Super Typhoon and equivalent to a Category 5 Hurricane on the Saffir-Simpson Hurricane Wind Scale. Meranti is forecast to continue moving northwestward toward mainland China, possibly landfalling as a typhoon. Heavy rain will lead to flooding across portions of southeast China over the coming days.

TROPICAL STORM MALAKAS



This is Tropical Storm Malakas in the western Pacific east of the Philippines. Malakas is not expected to directly impact the Philippines, but could pose a threat to Japan over the coming days. Here is the latest (7 PM CDT/00Z) advisory information for Malakas from the Joint Typhoon Warning Center:


Malakas is currently located at 15.5 N, 133.0 E, and is moving WNW at 18 mph. Maximum sustained winds (estimated) are near 70 mph. Malakas is expected to intensify and gain typhoon status shortly and continue strengthening as it moves primarily to the north of Taiwan, though it is not currently forecast to become a super typhoon. However, Malakas is currently forecast to impact southern Japan as a typhoon in the coming days.

HURRICANE ORLENE



This is Hurricane Orlene in the eastern Pacific. Orlene is just drifting around right now, but is expected to make a turn toward the west soon. Here is the latest (10 PM CDT/03Z) information for Orlene from the National Hurricane Center:

SUMMARY OF 800 PM PDT...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...20.4N 118.6W
ABOUT 585 MI...940 KM WSW OF THE SOUTHERN TIP OF BAJA CALIFORNIA
MAXIMUM SUSTAINED WINDS...85 MPH...140 KM/H
PRESENT MOVEMENT...N OR 360 DEGREES AT 1 MPH...2 KM/H
MINIMUM CENTRAL PRESSURE...980 MB...28.94 INCHES
Yes, you read that correctly. Orlene is moving north at 1 mph. That's probably the slowest setting you have on your treadmill. Orlene is expected to weaken as it makes its westward turn, and could weaken back to tropical depression status this weekend.

TROPICAL STORM IAN



Ian is still rather disorganized. If you look closely, you can see that the center is south of the main area of convection as Ian continues to deal with strong southerly shear. This has helped to inhibit any major strengthening thus far. Here is the latest (10 PM CDT/03Z) information from Ian from the National Hurricane Center:


SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...27.6N 52.8W
ABOUT 785 MI...1265 KM ESE OF BERMUDA
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...NNW OR 345 DEGREES AT 13 MPH...20 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
Ian is expected to remain away from any land areas and affect no one. That's what we like to see. Ian may strengthen a bit more, and some guidance brings it close to hurricane status. The official forecast calls for a maximum intensity of 65 mph.

TROPICAL STORM JULIA



Surprise! Well, sort of. This was Invest 93-L. The National Hurricane Center at 7 AM CDT Tuesday morning gave this a "near 0% chance" of formation, because it was rather disorganized. Then, at 1 PM CDT, the National Hurricane Center upped the chances to 40%, noting that organization was increasing and that advisories could be initiated soon. They decided not to initiate advisories at 4 PM CDT, but increased the chances of development to 70% at 7 PM CDT. At 10 PM CDT, the National Hurricane Center officially declared this a tropical storm. But, there's something weird about Julia's formation. Technically, Julia became a tropical storm over land. While it has happened before, it is a very rare occurrence. What may have happened is that as 93L paralleled the coast of northeastern Florida, the friction from the land versus the water helped tighten up the circulation moreso, giving 93L more organization. Tropical storm force winds are possible in some of the rainbands. So, here is the latest (10 PM CDT/03Z) information from the National Hurricane Center:

SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...30.3N 81.6W
ABOUT 5 MI...10 KM W OF JACKSONVILLE FLORIDA
ABOUT 60 MI...100 KM S OF BRUNSWICK GEORGIA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NNW OR 345 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...1009 MB...29.80 INCHES
There are Tropical Storm Warnings in effect for some locations:

  • In Florida: coastal Nassau and coastal Duval counties
  • In Georgia: Glynn and Camden counties
Julia is expected to move further northward into southern Georgia and weaken. The main threat from Julia will be very heavy rainfall across northeast Florida, southeast Georgia, and parts of coastal South Carolina. 3-6 inches of rain is possible with localized amounts near 10 inches. Also, can't rule out an isolated tornado. In fact, there was a confirmed tornado near Barefoot Bay in Brevard County, Florida Tuesday afternoon.

INVEST 95L



Our final stop takes us out to the other side of the Atlantic near the Cabo Verde Islands. This is Invest 95L, It is moving off to the west-northwest, bring heavy rain and gusty winds to the Cabo Verde Islands. Here is the latest (7 PM CDT/00Z) from the National Hurricane Center:

A broad area of low pressure, associated with a tropical wave,
located a couple of hundred miles east-southeast of the Cabo Verde
Islands is producing a large area of disorganized cloudiness and
showers.  Slow development of this disturbance is possible during
the next several days while it moves west-northwestward at 10 to 15
mph over the tropical Atlantic.  Regardless of development, locally
heavy rains and gusty winds are likely over portions of the Cabo
Verde Islands through Wednesday.
* Formation chance through 48 hours...medium...40 percent
* Formation chance through 5 days...medium...60 percent
Some development from 95L is possible over the coming days. Here are the latest model runs for 95L:


Once 95L clears the Cabo Verde Islands, it will continue on a west or west-northwest track over the open tropical Atlantic, not affecting any land in the forseeable future. But, if 95L does become a named storm, the next name on the list is Karl.

Wednesday, August 31, 2016

Tropical Threats to Hawaii and Florida

There are not one, not two, but THREE tropical cyclones that are threatening the United States, namely Hawaii and Florida. First, here is a quick update on the other systems.

HURRICANE GASTON



Gaston is a Category 2 hurricane tracking east-northeastward across the northern Atlantic. Gaston could affect the Azores into this weekend as a weakening tropical storm. Here is the latest track and information from the National Hurricane Center:


SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...36.0N 45.4W
ABOUT 935 MI...1500 KM W OF FAIAL ISLAND IN THE CENTRAL AZORES
ABOUT 1020 MI...1640 KM W OF LAJES AIR BASE IN THE AZORES
MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H
PRESENT MOVEMENT...NE OR 55 DEGREES AT 20 MPH...31 KM/H
MINIMUM CENTRAL PRESSURE...970 MB...28.65 INCHES
A Tropical Storm Watch has been issued for a part of the Azores. A TROPICAL STORM WATCH means that tropical storm conditions (winds of 39-74 mph) are possible within the next 48 hours.

TROPICAL DEPRESSION EIGHT



Tropical Depression Eight is moving away from the North Carolina Outer Banks. Minimal impacts expected. Just some higher waves and dangerous rip currents expected. TD 8 is expected to merge with a front as it accelerates northeastward. Here is the latest from the National Hurricane Center:

SUMMARY OF 1100 PM EDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...36.7N 70.1W
ABOUT 320 MI...515 KM ENE OF CAPE HATTERAS NORTH CAROLINA
ABOUT 1110 MI...1790 KM WSW OF CAPE RACE NEWFOUNDLAND
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...ENE OR 65 DEGREES AT 18 MPH...30 KM/H
MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES
Now, lets start talking about the threats to Hawaii.

TROPICAL STORM MADELINE



Madeline has weakened from a major hurricane yesterday back to a tropical storm now. However, Hawai'i as a whole is not accustomed to hurricanes or strong tropical storms. So this is a serious threat. Here is the latest information and track for Hurricane Madeline from the Central Pacific Hurricane Center:


SUMMARY OF 500 PM HST...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...18.0N 155.1W
ABOUT 115 MI...190 KM S OF HILO HAWAII
ABOUT 290 MI...470 KM SE OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...WSW OR 250 DEGREES AT 12 MPH...19 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
There is a TROPICAL STORM WARNING for the islands of Hawai'i, Maui, Molokai, Lanai, and Kahoolawe. 
  • TROPICAL STORM WARNING - tropical storm conditions (winds of 39-74 mph) are expected within the next 36 hours
Strong winds, heavy rain, and dangerous surf are expected along the southern islands of Hawai'i. The worst effects will be felt along the Big Island.

MAJOR HURRICANE LESTER



Lester is a Category 3 hurricane moving off toward the west across the central Pacific. The hurricane is expected to weaken as it approaches Hawai'i this weekend. Here is the latest information for Hurricane Lester from the National Hurricane Center:


SUMMARY OF 500 PM HST...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...18.2N 141.2W
ABOUT 915 MI...1470 KM E OF HILO HAWAII
ABOUT 1105 MI...1780 KM E OF HONOLULU HAWAII
MAXIMUM SUSTAINED WINDS...120 MPH...195 KM/H
PRESENT MOVEMENT...W OR 280 DEGREES AT 14 MPH...22 KM/H
MINIMUM CENTRAL PRESSURE...959 MB...28.32 INCHES
Much of the state of Hawai'i is in the projected path. But, again, main threats look to be increased surf, high winds, and heavy rainfall. Tropical Storm Watches or Hurricane Watches may be required as we head into the day Thursday.


TROPICAL STORM HERMINE



Tropical Depressoon Nine strengthened into Tropical Storm Hermine at 1 PM CDT after the Hurricane Hunters found sustained tropical-storm force winds. It is getting better organized, and Hermine is expected to strengthen until landfall. Here is the latest track and information from the National Hurricane Center:


SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...25.8N 87.0W
ABOUT 295 MI...475 KM SSW OF APALACHICOLA FLORIDA
ABOUT 315 MI...510 KM WSW OF TAMPA FLORIDA
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...NNE OR 25 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
Now, there are a lot of watches and warnings in effect. The map above only shows the coastal watches and warnings. I will provide the counties under the Tropical Storm/Hurricane Watches/Warnings (as of 10 PM CDT):
  • HURRICANE WARNING: [in Florida]: Gulf, Gadsden, Liberty, Franklin, Leon, Wakulla, Jefferson, Madison, Taylor, coastal Dixie
  • TROPICAL STORM WARNING: [in Florida]: Levy, Citrus, Hernando, Pasco, Walton, Holmes, Washington, Bay, Jackson, Calhoun, inland Dixie, [in Georgia]: Seminole, Decatur, Grady, Thomas, Brooks, Lowndes, Early, Miller, Baker, Mitchell, Colquitt, Cook, Lanier, Clay, Calhoun, Dougherty, Berrien, Worth, Tift, Turner, Irwin, Ben Hill, Quitman, Terrell, Randolph, Lee, [in Alabama]: Geneva, Houston, Henry
  • HURRICANE WATCH: [in Florida]: south Walton, Bay, Calhoun, Gulf, Gadsden, Liberty, Franklin, Leon, Wakulla, Jefferson, Madison, Taylor, coastal Dixie, coastal Levy, coastal Citrus, coastal Hernando, coastal Pasco
  • TROPICAL STORM WATCH: [in Florida]: Hamilton, Suwannee, Columbia, Baker, Nassau, Duval, Union, Bradford, Clay, St. Johns, Gilchrist, Alachua, Putnam, Marion, [in Georgia]: Coffee, Jeff Davis, Bacon, Appling, Wayne, Atkinson, Ware, Pierce, Brantley, Glynn, Echols, Clinch, Charlton, Camden, Washington, Glascock, Jefferson, Twiggs, Wilkinson, Johnson, Emanuel, Schley, Macon, Peach, Houston, Bleckley, Laurens, Treatment, Sumter, Dooly, Crisp, Pulaski, Wilcox, Dodge, Telfair, Wheeler, Montgomery, Toombs, Screven, Jenkins, Effingham, Bulloch, Candler, Tattnall, Evans, Long, Liberty, Bryan, Chatham, McIntosh, [in South Carolina]: Allendale, Hampton, Jaspee, Colleton, Beaufort, Dorchester, Charleston, Berkeley

Now, the National Hurricane Center has also released an experimental product (which will become operational next year. There is a STORM SURGE WARNING for areas from near Indian Pass to near Spring Hill. A Storm Surge Warning mean that life-threatening storm surge and inundation is expected within the warning area.


Now, this is the reasonable worst-case storm surge flooding, most areas along the Big Bend and northern west coast will see at least 1 foot of storm surge flooding. Within the Big Bend, it's not out of the question to see 3 to 6 feet of storm surge flooding. And this does not include waves on top of that surge. It is highly recommended that if you live in these areas that you seek higher ground.

Even outside of these areas, coastal flooding can still occur, especially near high tide. There is a high risk of rip currents and also high surf. Heavy rainfall is occurring along the west coast of Florida and is expected to continue. Most of the effects will be on the east side of the system, so it is important not to focus on just the cone. If you are under a Tropical Storm Warning, you need to have your emergency preparedness kit ready to go. Heed all evacuation orders. If you are under a Tropical Storm Watch, you need to be stocking your emergency preparedness kit and be ready to use it if necessary. Monitor local officials, and official sources such as NOAA, NWS, NHC, etc. For everyone, be prepared for power outages under a Tropical Storm Watch or Warning. Tornadoes are possible across much of north central Florida into southeastern Georgia.

Stay safe, be prepared, and monitor local sources.

Useful links:
National Hurricane Center: website, Facebook, @NWSNHC, @NHC_Atlantic, @NHC_Pacific
Central Pacific Hurricane Center: website
NWS Honolulu: website, Facebook, Twitter
NWS Tallahassee: website, Facebook, Twitter
NWS Tampa Bay: website, Facebook, Twitter
NWS Jacksonville: website, Facebook, Twitter
NWS Peachtree City: website, Facbook, Twitter
NWS Charleston: website, Facebook, Twitter