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Tropical Storm Debby Graphics
5-Day Uncertainty Track last updated Thu, 08 Aug 2024 14:43:58 GMT
Wind Speed Probabilities last updated Thu, 08 Aug 2024 15:22:55 GMT
Categories: Weather
Tropical Storm Debby Forecast Discussion Number 25
Issued at 1100 AM EDT Thu Aug 08 2024
000
WTNT44 KNHC 081442
TCDAT4
Tropical Storm Debby Discussion Number 25
NWS National Hurricane Center Miami FL AL042024
1100 AM EDT Thu Aug 08 2024
Debby continues to move farther inland with the center now located
over northern South Carolina. Surface observations and radar data
indicate that the strongest winds are likely occurring near the
coast and just offshore of southern North Carolina. The highest
sustained winds during the past couple of hours from reliable
surface observation sites are near 30 kt with higher gusts. Based
on the decreasing observed wind speeds, the initial intensity is
lowered to 35 kt for this advisory. By far, the most significant
threat with Debby continues to be flash flooding from heavy
rainfall.
Debby is starting to accelerate toward the north-northwest, with the
current motion estimated at 345/9-kt. A ridge that is currently
strengthening over the western Atlantic will cause Debby to
accelerate northward, moving across central North Carolina this
evening. Then, a deep-layer trough will approach the Great Lakes
region on Friday, which will cause Debby to accelerate northeastward
over the Mid-Atlantic and Northeast U.S. Friday and Friday night and
then over Atlantic Canada on Saturday. There are only minor changes
to the track forecast, hedging toward the latest consensus models.
Debby should continue to weaken as it moves farther inland, and most
of the models indicate that the winds near the coast should decrease
a bit more later today. Debby is expected to weaken to a tropical
depression by this afternoon or evening. Model phase space diagrams
show that Debby should complete transition to an extratropical
cyclone in about 24 to 30 h. The current satellite imagery shows
that Debby is already starting to interact with the jet stream,
which extends toward the east-northeast over the North Atlantic.
Debby is now expected to complete extratropical transition in about
24 h as the cyclone merges with a cold front while over the
mid-Atlantic states. Beyond Friday, models show a post-tropical
Debby becoming extremely elongated along the cold front, which will
eventually lead to dissipation. The new NHC forecast has Debby
dissipating Sunday morning, but that could occur sooner.
Key Messages:
1. Heavy rainfall across portions of the Carolinas is expected to
persist through today along with areas of considerable flooding.
Heavy rainfall will also result in considerable to locally
catastrophic flooding impacts across portions of the Mid-Atlantic
States and Northeast through Saturday morning.
2. Tropical storm conditions will continue for several more hours in
the Tropical Storm Warning area along the coast of northeastern
South Carolina and portions of North Carolina.
3. Coastal flooding due to storm surge is likely to continue along
portions of the North Carolina coastline for several more hours.
FORECAST POSITIONS AND MAX WINDS
INIT 08/1500Z 34.5N 79.9W 35 KT 40 MPH...INLAND
12H 09/0000Z 35.8N 79.9W 30 KT 35 MPH...INLAND
24H 09/1200Z 38.7N 78.8W 30 KT 35 MPH...POST-TROP/EXTRATROP
36H 10/0000Z 42.8N 75.0W 30 KT 35 MPH...POST-TROP/EXTRATROP
48H 10/1200Z 47.0N 69.3W 30 KT 35 MPH...POST-TROP/EXTRATROP
60H 11/0000Z 50.7N 61.9W 30 KT 35 MPH...POST-TROP/EXTRATROP
72H 11/1200Z...DISSIPATED
$$
Forecaster Hagen/Cangialosi
Categories: Weather
Tropical Storm Debby Wind Speed Probabilities Number 25
Issued at 1500 UTC THU AUG 08 2024
000
FONT14 KNHC 081442
PWSAT4
TROPICAL STORM DEBBY WIND SPEED PROBABILITIES NUMBER 25
NWS NATIONAL HURRICANE CENTER MIAMI FL AL042024
1500 UTC THU AUG 08 2024
AT 1500Z THE CENTER OF TROPICAL STORM DEBBY WAS LOCATED NEAR
LATITUDE 34.5 NORTH...LONGITUDE 79.9 WEST WITH MAXIMUM SUSTAINED
WINDS NEAR 35 KTS...40 MPH...65 KM/H.
Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH)
ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME
EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME
CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME
WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS
CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST
...34 KT (39 MPH... 63 KM/H)...
...50 KT (58 MPH... 93 KM/H)...
...64 KT (74 MPH...119 KM/H)...
FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS
PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE
OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING
AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY)
(CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN
12Z THU AND THE FORECAST HOUR (CUMULATIVE PROBABILITY)
PROBABILITIES ARE GIVEN IN PERCENT
X INDICATES PROBABILITIES LESS THAN 1 PERCENT
PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN
THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT.
PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY
64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT.
- - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - -
FROM FROM FROM FROM FROM FROM FROM
TIME 12Z THU 00Z FRI 12Z FRI 00Z SAT 12Z SAT 12Z SUN 12Z MON
PERIODS TO TO TO TO TO TO TO
00Z FRI 12Z FRI 00Z SAT 12Z SAT 12Z SUN 12Z MON 12Z TUE
FORECAST HOUR (12) (24) (36) (48) (72) (96) (120)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
LOCATION KT
ST JOHN NB 34 X X( X) X( X) 4( 4) 1( 5) X( 5) X( 5)
EASTPORT ME 34 X X( X) X( X) 5( 5) 1( 6) X( 6) X( 6)
AUGUSTA ME 34 X X( X) X( X) 4( 4) X( 4) X( 4) X( 4)
PORTLAND ME 34 X X( X) X( X) 4( 4) X( 4) X( 4) X( 4)
CONCORD NH 34 X X( X) 1( 1) 6( 7) X( 7) X( 7) X( 7)
PORTSMOUTH NH 34 X X( X) 1( 1) 2( 3) X( 3) X( 3) X( 3)
WORCESTER MA 34 X X( X) 1( 1) 3( 4) X( 4) X( 4) X( 4)
SPRINGFIELD MA 34 X X( X) 4( 4) 2( 6) X( 6) X( 6) X( 6)
PROVIDENCE RI 34 X X( X) 3( 3) 2( 5) X( 5) X( 5) X( 5)
BRIDGEPORT CT 34 X X( X) 4( 4) X( 4) X( 4) X( 4) X( 4)
NEW HAVEN CT 34 X X( X) 4( 4) X( 4) X( 4) X( 4) X( 4)
HARTFORD CT 34 X X( X) 4( 4) X( 4) X( 4) X( 4) X( 4)
ALBANY NY 34 X X( X) 13(13) 4(17) X(17) X(17) X(17)
POUGHKEEPSIE 34 X X( X) 11(11) 1(12) X(12) X(12) X(12)
MONTAUK POINT 34 X X( X) 4( 4) 1( 5) X( 5) X( 5) X( 5)
ISLIP NY 34 X X( X) 3( 3) X( 3) X( 3) X( 3) X( 3)
NYC JFK AIRPRT 34 X X( X) 10(10) X(10) X(10) X(10) X(10)
NYC CNTRL PARK 34 X X( X) 6( 6) X( 6) X( 6) X( 6) X( 6)
NEWARK NJ 34 X X( X) 7( 7) X( 7) X( 7) X( 7) X( 7)
TRENTON NJ 34 X X( X) 9( 9) X( 9) X( 9) X( 9) X( 9)
NWS EARLE NJ 34 X X( X) 5( 5) X( 5) X( 5) X( 5) X( 5)
ALLENTOWN PA 34 X X( X) 18(18) X(18) X(18) X(18) X(18)
PHILADELPHIA 34 X X( X) 9( 9) X( 9) X( 9) X( 9) X( 9)
ATLANTIC CITY 34 X X( X) 3( 3) X( 3) X( 3) X( 3) X( 3)
BALTIMORE MD 34 X 6( 6) 12(18) X(18) X(18) X(18) X(18)
DOVER DE 34 X 1( 1) 4( 5) X( 5) X( 5) X( 5) X( 5)
ANNAPOLIS MD 34 X 6( 6) 8(14) X(14) X(14) X(14) X(14)
WASHINGTON DC 34 X 11(11) 10(21) X(21) X(21) X(21) X(21)
CAPE HENLOPEN 34 X 2( 2) 5( 7) X( 7) X( 7) X( 7) X( 7)
OCEAN CITY MD 34 X 2( 2) 3( 5) X( 5) X( 5) X( 5) X( 5)
PAX RIVER NAS 34 X 5( 5) 2( 7) X( 7) X( 7) X( 7) X( 7)
WALLOPS CDA 34 X 3( 3) 2( 5) X( 5) X( 5) X( 5) X( 5)
CHARLOTTESVIL 34 X 31(31) X(31) X(31) X(31) X(31) X(31)
RICHMOND VA 34 X 12(12) 1(13) X(13) X(13) X(13) X(13)
DANVILLE VA 34 25 8(33) X(33) X(33) X(33) X(33) X(33)
OCEANA NAS VA 34 1 2( 3) X( 3) X( 3) X( 3) X( 3) X( 3)
GREENSBORO NC 34 22 1(23) X(23) X(23) X(23) X(23) X(23)
RALEIGH NC 34 86 1(87) X(87) X(87) X(87) X(87) X(87)
ROCKY MT NC 34 17 3(20) X(20) X(20) X(20) X(20) X(20)
FAYETTEVILLE 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
SURF CITY NC 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
WILMINGTON NC 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
BALD HEAD ISL 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
FLORENCE SC 34 75 X(75) X(75) X(75) X(75) X(75) X(75)
LITTLE RIVER 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
MYRTLE BEACH 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
GEORGETOWN SC 34 99 X(99) X(99) X(99) X(99) X(99) X(99)
$$
FORECASTER HAGEN/CANGIALOSI
Categories: Weather
Summary for Tropical Storm Debby (AT4/AL042024)
...MAJOR FLOOD THREAT CONTINUES FOR PORTIONS OF THE CAROLINAS AND WESTERN VIRGINIA AS DEBBY MOVES FARTHER INLAND...
As of 11:00 AM EDT Thu Aug 8
the center of Debby was located near 34.5, -79.9
with movement NNW at 10 mph.
The minimum central pressure was 996 mb
with maximum sustained winds of about 40 mph.
Categories: Weather
Tropical Storm Debby Public Advisory Number 25
Issued at 1100 AM EDT Thu Aug 08 2024
000
WTNT34 KNHC 081441
TCPAT4
BULLETIN
Tropical Storm Debby Advisory Number 25
NWS National Hurricane Center Miami FL AL042024
1100 AM EDT Thu Aug 08 2024
...MAJOR FLOOD THREAT CONTINUES FOR PORTIONS OF THE CAROLINAS AND
WESTERN VIRGINIA AS DEBBY MOVES FARTHER INLAND...
SUMMARY OF 1100 AM EDT...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...34.5N 79.9W
ABOUT 80 MI...125 KM SE OF CHARLOTTE NORTH CAROLINA
ABOUT 110 MI...180 KM SW OF RALEIGH NORTH CAROLINA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NNW OR 345 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...996 MB...29.42 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
The Tropical Storm Warning from South Santee River to Murrells
Inlet has been discontinued.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* North of Murrells Inlet, South Carolina to Ocracoke Inlet,
North Carolina
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case during the
next several hours.
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
DISCUSSION AND OUTLOOK
----------------------
At 1100 AM EDT (1500 UTC), the center of Tropical Storm Debby was
located near latitude 34.5 North, longitude 79.9 West. Debby is
moving toward the north-northwest near 10 mph (17 km/h). The storm
is expected to accelerate toward the north across central North
Carolina through tonight. Debby is then expected to move faster
toward the northeast across the U.S. Mid-Atlantic and Northeast on
Friday and Atlantic Canada on Saturday.
Maximum sustained winds have decreased to near 40 mph (65 km/h)
with higher gusts. Continued weakening is forecast, and Debby is
likely to become a tropical depression this afternoon or evening.
Debby should then merge with a front and become extratropical on
Friday.
Tropical-storm-force winds extend outward up to 195 miles (315 km)
from the center.
The estimated minimum central pressure based on surface
observations is 996 mb (29.42 inches).
HAZARDS AFFECTING LAND
----------------------
Key messages for Debby can be found in the Tropical Cyclone
Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC.
WIND: Tropical storm conditions are expected to continue along the
coast of northeastern South Carolina and portions of coastal North
Carolina within the tropical storm warning area during the next
several hours.
STORM SURGE: The combination of storm surge and tide will cause
normally dry areas near the coast to be flooded by rising waters
moving inland from the shoreline. The water could reach the
following heights above ground somewhere in the indicated areas if
the peak surge occurs at the time of high tide...
Cape Fear to Ocracoke Inlet including the Neuse and Pamlico
Rivers...1 to 3 ft
For a complete depiction of areas at risk of storm surge inundation,
please see the National Weather Service Peak Storm Surge Graphic,
available at hurricanes.gov/graphics_at4.shtml?peakSurge.
RAINFALL: Debby is expected to produce an additional 3 to 6 inches
of rainfall with locally higher amounts, across portions of
southeastern North Carolina leading to maximum storm total amounts
as high as 15 inches. Additional rainfall of 1 to 3 inches over
portions of eastern South Carolina will bring maximum storm total
amounts as high as 20 to 25 inches. Considerable flooding is
expected across portions of eastern South Carolina and southeast
North Carolina through Friday.
From central North Carolina northward across portions of Virginia, 3
to 7 inches with local amounts to 10 inches, are expected through
Friday. This rainfall will likely result in areas of considerable to
locally catastrophic flash and urban flooding, especially in the
terrain of western Virginia, with river flooding also possible.
From portions of Maryland north through Upstate New York and
Vermont, 2 to 4 inches, with local amounts to 6 inches, are expected
through Friday night. This will likely result in areas of
considerable flash and urban flooding as well as river flooding.
For the remainder of northern New England, 1 to 3 inches, with
local amounts to 4 inches, are expected into Saturday. Scattered
instances of flash flooding are possible.
For a complete depiction of forecast rainfall and flash flooding
associated with Debby, please see the National Weather Service
Storm Total Rainfall Graphic, available at
hurricanes.gov/graphics_at4.shtml?rainqpf and the Flash Flood Risk
graphic at hurricanes.gov/graphics_at4.shtml?ero. For a list of
rainfall observations (and wind reports) associated with this
storm, see the companion storm summary at WBCSCCNS4 with the WMO
header ACUS44 KWBC or at the following link:
www.wpc.ncep.noaa.gov/discussions/nfdscc4.html.
TORNADOES: A few tornadoes may occur today and tonight from central
and eastern North Carolina into central and southeast Virginia.
SURF: Large swells will continue to affect the Southeast U.S.
coast for another day or two. These conditions are likely to
cause life-threatening surf and rip current conditions. Please
consult products from your local weather office.
NEXT ADVISORY
-------------
Next intermediate advisory at 200 PM EDT.
Next complete advisory at 500 PM EDT.
$$
Forecaster Hagen/Cangialosi
Categories: Weather
Tropical Storm Debby Forecast Advisory Number 25
Issued at 1500 UTC THU AUG 08 2024
000
WTNT24 KNHC 081441
TCMAT4
TROPICAL STORM DEBBY FORECAST/ADVISORY NUMBER 25
NWS NATIONAL HURRICANE CENTER MIAMI FL AL042024
1500 UTC THU AUG 08 2024
TROPICAL STORM CENTER LOCATED NEAR 34.5N 79.9W AT 08/1500Z
POSITION ACCURATE WITHIN 25 NM
PRESENT MOVEMENT TOWARD THE NORTH-NORTHWEST OR 345 DEGREES AT 9 KT
ESTIMATED MINIMUM CENTRAL PRESSURE 996 MB
MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT.
34 KT.......150NE 170SE 0SW 0NW.
12 FT SEAS..300NE 270SE 0SW 0NW.
WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL
MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.
REPEAT...CENTER LOCATED NEAR 34.5N 79.9W AT 08/1500Z
AT 08/1200Z CENTER WAS LOCATED NEAR 34.0N 79.9W
FORECAST VALID 09/0000Z 35.8N 79.9W...INLAND
MAX WIND 30 KT...GUSTS 40 KT.
FORECAST VALID 09/1200Z 38.7N 78.8W...POST-TROP/EXTRATROP
MAX WIND 30 KT...GUSTS 40 KT.
FORECAST VALID 10/0000Z 42.8N 75.0W...POST-TROP/EXTRATROP
MAX WIND 30 KT...GUSTS 40 KT.
FORECAST VALID 10/1200Z 47.0N 69.3W...POST-TROP/EXTRATROP
MAX WIND 30 KT...GUSTS 40 KT.
FORECAST VALID 11/0000Z 50.7N 61.9W...POST-TROP/EXTRATROP
MAX WIND 30 KT...GUSTS 40 KT.
FORECAST VALID 11/1200Z...DISSIPATED
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 34.5N 79.9W
INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 08/1800Z
NEXT ADVISORY AT 08/2100Z
$$
FORECASTER HAGEN/CANGIALOSI
Categories: Weather
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