Pathfinder
Editor, Senior Moderator
Irene becomes a category 3 - Hurricane Warning for Bahamas
Irene becomes a category 3 - Hurricane Warning for Bahamas
Hurricane IRENE Forecast Discussion
000
WTNT44 KNHC 240846
TCDAT4
HURRICANE IRENE DISCUSSION NUMBER 16
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092011
500 AM EDT WED AUG 24 2011
THE LAST PENETRATION OF THE EYE BY THE AIR FORCE HURRICANE HUNTERS
WAS JUST AFTER 0500 UTC...AND THEY FOUND THAT THE CENTRAL PRESSURE
HAD DROPPED TO 966 MB. THEY ALSO MEASURED 700 MB FLIGHT-LEVEL WINDS
OF 92 KT OUTBOUND IN THE SOUTHEAST QUADRANT. IT IS LIKELY THAT
HIGHER WINDS WERE OCCURRING OVER THE NORTHEAST QUADRANT OF THE
HURRICANE. OVER THE PAST FEW HOURS..THE SATELLITE PRESENTATION OF
IRENE HAS BECOME QUITE IMPRESSIVE WITH THE EYE EMBEDDED WITHIN VERY
COLD CLOUD TOPS. DVORAK INTENSITY ESTIMATES FROM BOTH TAFB AND SAB
ARE 100 KT. COMBINING THE ABOVE INFORMATION...THE CURRENT
INTENSITY IS SET CONSERVATIVELY AT 95 KT FOR THIS ADVISORY. ANOTHER
HURRICANE HUNTER MISSION IS SCHEDULED FOR 1200 UTC TO MEASURE THE
INTENSITY OF THE HURRICANE. ALTHOUGH THE NUMERICAL GUIDANCE
INDICATES SOME SOUTH-SOUTHWESTERLY SHEAR OVER THE AREA...THIS SHEAR
IS NOT EXPECTED TO PREVENT FURTHER STRENGTHENING AND IT SEEMS
HIGHLY LIKELY THAT IRENE WILL INTENSIFY TO CATEGORY 3 STATUS LATER
TODAY. SOME FLUCTUATIONS IN STRENGTH COULD OCCUR IN 1 TO 2 DAYS
DUE TO EYEWALL REPLACEMENTS. IN FACT...THE UW-CIMSS OBJECTIVE
TECHNIQUE SHOWS A CONSIDERABLY HIGHER THAN CLIMATOLOGICAL
PROBABILITY OF SECONDARY EYEWALL FORMATION WITHIN 24 TO 48 HOURS.
THE OFFICIAL INTENSITY FORECAST IS CLOSE TO THE NUMERICAL CONSENSUS
AND LIES BETWEEN THE GFDL/HWRF MODELS AND THE LGEM GUIDANCE.
SATELLITE ANIMATION AND CENTER FIXES SHOW THAT THE EYE OF IRENE HAS
BEEN WOBBLING BETWEEN A WEST AND NORTHWEST HEADING OVER THE PAST
SEVERAL HOURS. SMOOTHING THROUGH THESE WOBBLES YIELDS A MORE
REPRESENTATIVE MOTION OF ABOUT 295/8. THERE HAS BEEN LITTLE CHANGE
TO THE TRACK FORECAST REASONING FROM THE PAST FEW ADVISORIES. OVER
THE NEXT COUPLE OF DAYS...THE HURRICANE IS EXPECTED TO GRADUALLY
TURN TOWARD THE NORTHWEST AND NORTH AS IT MOVES THROUGH A
PRONOUNCED WEAKNESS IN THE SUBTROPICAL RIDGE. AROUND 72 HOURS...A
SHORTWAVE TROUGH MOVING THROUGH THE GREAT LAKES SHOULD BEGIN TO
INDUCE AT LEAST A SLIGHT TURN TOWARD THE NORTH-NORTHEAST WITH SOME
ACCELERATION AFTERWARDS. THE DYNAMICAL TRACK MODEL CONSENSUS
HAS...AGAIN...SHIFTED A LITTLE TO THE EAST FROM THE PREVIOUS
PACKAGE. THE OFFICIAL FORECAST IS NOT SUBSTANTIALLY DIFFERENT FROM
THE PREVIOUS ONE AND LIES A LITTLE TO THE LEFT OF THE CONSENSUS.
USERS ARE REMINDED THAT SIGNIFICANT ERRORS ARE POSSIBLE WITH
FORECASTS AT LONGER LEAD TIMES...SO ONE SHOULD NOT FOCUS ON THE
EXACT FORECAST POSITIONS AT 96 AND 120 HOURS.
FORECAST POSITIONS AND MAX WINDS
INIT 24/0900Z 21.6N 72.9W 95 KT 110 MPH
12H 24/1800Z 22.5N 74.1W 105 KT 120 MPH
24H 25/0600Z 24.1N 75.4W 110 KT 125 MPH
36H 25/1800Z 25.8N 76.6W 110 KT 125 MPH
48H 26/0600Z 27.7N 77.0W 110 KT 125 MPH
72H 27/0600Z 32.0N 76.8W 105 KT 120 MPH
96H 28/0600Z 36.5N 75.0W 90 KT 105 MPH
120H 29/0600Z 42.0N 71.5W 70 KT 80 MPH...INLAND
$$
FORECASTER PASCH/KIMBERLAIN
http://www.nhc.noaa.gov/text/refresh/MIATCDAT4+shtml/240846.shtml?
--------------------------------------------------------------
Hurricane IRENE Public Advisory
000
WTNT34 KNHC 241157
TCPAT4
BULLETIN
HURRICANE IRENE INTERMEDIATE ADVISORY NUMBER 16A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092011
800 AM EDT WED AUG 24 2011
...IRENE BECOMES A CATEGORY THREE HURRICANE....EYE HEADED FOR THE
CROOKED AND ACKLINS ISLANDS...
SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...21.9N 73.3W
ABOUT 55 MI...85 KM SE OF ACKLINS ISLAND BAHAMAS
ABOUT 335 MI...540 KM SE OF NASSAU
MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...957 MB...28.26 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
THE GOVERNMENT OF THE BAHAMAS HAS CHANGED THE HURRICANE WARNING FOR
THE TURKS AND CAICOS ISLANDS TO A TROPICAL STORM WARNING.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
A HURRICANE WARNING IS IN EFFECT FOR...
* THE SOUTHEASTERN...CENTRAL...AND NORTHWESTERN BAHAMAS
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* TURKS AND CAICOS ISLANDS
FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR
PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE.
DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 800 AM EDT...1200 UTC...THE EYE OF HURRICANE IRENE WAS LOCATED
NEAR LATITUDE 21.9 NORTH...LONGITUDE 73.3 WEST. IRENE IS MOVING
TOWARD THE WEST-NORTHWEST NEAR 9 MPH...15 KM/H. A GRADUAL TURN
TOWARD THE NORTHWEST IS EXPECTED ON WEDNESDAY. ON THE FORECAST
TRACK...THE CORE OF IRENE WILL MOVE ACROSS THE SOUTHEASTERN AND
CENTRAL BAHAMAS TODAY AND OVER THE NORTHWESTERN BAHAMAS ON
THURSDAY.
DATA FROM AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT INDICATE
THAT THE MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 115
MPH...185 KM/H...WITH HIGHER GUSTS. IRENE IS A CATEGORY THREE
HURRICANE ON THE SAFFIR-SIMPSON HURRICANE WIND SCALE. SOME
ADDITIONAL STRENGTHENING IS FORECAST DURING THE DAY OR SO.
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 40 MILES...65 KM...FROM
THE CENTER...AND TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 205
MILES...335 KM. AN UNOFFICIAL REPORTING STATION AT PINE CAY IN THE
CAICOS ISLANDS RECENTLY REPORTED A WIND GUST TO 65 MPH....105 KM/H.
THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY A HURRICANE HUNTER
AIRCRAFT WAS 957 MB...28.26 INCHES.
HAZARDS AFFECTING LAND
----------------------
WIND...HURRICANE CONDITIONS ARE OCCURRING OVER PORTIONS OF THE
SOUTHEASTERN BAHAMAS. TROPICAL STORM CONDITIONS ARE EXPECTED TO
BEGIN OVER THE CENTRAL BAHAMAS THIS MORNING...WITH HURRICANE
CONDITIONS EXPECTED BY TONIGHT. TROPICAL STORM CONDITIONS ARE
EXPECTED IN THE NORTHWESTERN BAHAMAS BY LATE TONIGHT...WITH
HURRICANE CONDITIONS EXPECTED ON THURSDAY.
STORM SURGE...IN AREAS OF ONSHORE WINDS NEAR THE CENTER OF
IRENE...AN EXTREMELY DANGEROUS STORM SURGE WILL RAISE WATER LEVELS
BY AS MUCH AS 7 TO 11 FEET ABOVE NORMAL TIDE LEVELS OVER THE
CENTRAL AND NORTHWESTERN BAHAMAS...AND BY AS MUCH AS 5 TO 8 FEET
ABOVE NORMAL TIDE LEVELS OVER THE SOUTHEASTERN BAHAMAS AND THE
TURKS AND CAICOS ISLANDS. NEAR THE COAST...THE SURGE WILL BE
ACCOMPANIED BY LARGE AND DANGEROUS WAVES.
RAINFALL...IRENE IS EXPECTED TO PRODUCE ADDITIONAL RAINFALL
ACCUMULATIONS OF 1 TO 3 INCHES ACROSS PUERTO RICO AND HISPANIOLA.
ISOLATED MAXIMUM STORM TOTAL AMOUNTS OF 15 INCHES ARE POSSIBLE IN
ASSOCIATION WITH IRENE. THESE RAINS COULD CAUSE LIFE-THREATENING
FLASH FLOODS AND MUD SLIDES IN AREAS OF STEEP TERRAIN. RAINFALL
ACCUMULATIONS OF 6 TO 12 INCHES ARE EXPECTED IN THE BAHAMAS...AND
THE TURKS AND CAICOS ISLANDS.
NEXT ADVISORY
-------------
NEXT COMPLETE ADVISORY...1100 AM EDT.
$$
FORECASTER BROWN/BLAKE
http://www.nhc.noaa.gov/text/refresh/MIATCPAT4+shtml/241157.shtml?
Irene becomes a category 3 - Hurricane Warning for Bahamas
Hurricane IRENE Forecast Discussion
000
WTNT44 KNHC 240846
TCDAT4
HURRICANE IRENE DISCUSSION NUMBER 16
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092011
500 AM EDT WED AUG 24 2011
THE LAST PENETRATION OF THE EYE BY THE AIR FORCE HURRICANE HUNTERS
WAS JUST AFTER 0500 UTC...AND THEY FOUND THAT THE CENTRAL PRESSURE
HAD DROPPED TO 966 MB. THEY ALSO MEASURED 700 MB FLIGHT-LEVEL WINDS
OF 92 KT OUTBOUND IN THE SOUTHEAST QUADRANT. IT IS LIKELY THAT
HIGHER WINDS WERE OCCURRING OVER THE NORTHEAST QUADRANT OF THE
HURRICANE. OVER THE PAST FEW HOURS..THE SATELLITE PRESENTATION OF
IRENE HAS BECOME QUITE IMPRESSIVE WITH THE EYE EMBEDDED WITHIN VERY
COLD CLOUD TOPS. DVORAK INTENSITY ESTIMATES FROM BOTH TAFB AND SAB
ARE 100 KT. COMBINING THE ABOVE INFORMATION...THE CURRENT
INTENSITY IS SET CONSERVATIVELY AT 95 KT FOR THIS ADVISORY. ANOTHER
HURRICANE HUNTER MISSION IS SCHEDULED FOR 1200 UTC TO MEASURE THE
INTENSITY OF THE HURRICANE. ALTHOUGH THE NUMERICAL GUIDANCE
INDICATES SOME SOUTH-SOUTHWESTERLY SHEAR OVER THE AREA...THIS SHEAR
IS NOT EXPECTED TO PREVENT FURTHER STRENGTHENING AND IT SEEMS
HIGHLY LIKELY THAT IRENE WILL INTENSIFY TO CATEGORY 3 STATUS LATER
TODAY. SOME FLUCTUATIONS IN STRENGTH COULD OCCUR IN 1 TO 2 DAYS
DUE TO EYEWALL REPLACEMENTS. IN FACT...THE UW-CIMSS OBJECTIVE
TECHNIQUE SHOWS A CONSIDERABLY HIGHER THAN CLIMATOLOGICAL
PROBABILITY OF SECONDARY EYEWALL FORMATION WITHIN 24 TO 48 HOURS.
THE OFFICIAL INTENSITY FORECAST IS CLOSE TO THE NUMERICAL CONSENSUS
AND LIES BETWEEN THE GFDL/HWRF MODELS AND THE LGEM GUIDANCE.
SATELLITE ANIMATION AND CENTER FIXES SHOW THAT THE EYE OF IRENE HAS
BEEN WOBBLING BETWEEN A WEST AND NORTHWEST HEADING OVER THE PAST
SEVERAL HOURS. SMOOTHING THROUGH THESE WOBBLES YIELDS A MORE
REPRESENTATIVE MOTION OF ABOUT 295/8. THERE HAS BEEN LITTLE CHANGE
TO THE TRACK FORECAST REASONING FROM THE PAST FEW ADVISORIES. OVER
THE NEXT COUPLE OF DAYS...THE HURRICANE IS EXPECTED TO GRADUALLY
TURN TOWARD THE NORTHWEST AND NORTH AS IT MOVES THROUGH A
PRONOUNCED WEAKNESS IN THE SUBTROPICAL RIDGE. AROUND 72 HOURS...A
SHORTWAVE TROUGH MOVING THROUGH THE GREAT LAKES SHOULD BEGIN TO
INDUCE AT LEAST A SLIGHT TURN TOWARD THE NORTH-NORTHEAST WITH SOME
ACCELERATION AFTERWARDS. THE DYNAMICAL TRACK MODEL CONSENSUS
HAS...AGAIN...SHIFTED A LITTLE TO THE EAST FROM THE PREVIOUS
PACKAGE. THE OFFICIAL FORECAST IS NOT SUBSTANTIALLY DIFFERENT FROM
THE PREVIOUS ONE AND LIES A LITTLE TO THE LEFT OF THE CONSENSUS.
USERS ARE REMINDED THAT SIGNIFICANT ERRORS ARE POSSIBLE WITH
FORECASTS AT LONGER LEAD TIMES...SO ONE SHOULD NOT FOCUS ON THE
EXACT FORECAST POSITIONS AT 96 AND 120 HOURS.
FORECAST POSITIONS AND MAX WINDS
INIT 24/0900Z 21.6N 72.9W 95 KT 110 MPH
12H 24/1800Z 22.5N 74.1W 105 KT 120 MPH
24H 25/0600Z 24.1N 75.4W 110 KT 125 MPH
36H 25/1800Z 25.8N 76.6W 110 KT 125 MPH
48H 26/0600Z 27.7N 77.0W 110 KT 125 MPH
72H 27/0600Z 32.0N 76.8W 105 KT 120 MPH
96H 28/0600Z 36.5N 75.0W 90 KT 105 MPH
120H 29/0600Z 42.0N 71.5W 70 KT 80 MPH...INLAND
$$
FORECASTER PASCH/KIMBERLAIN
http://www.nhc.noaa.gov/text/refresh/MIATCDAT4+shtml/240846.shtml?
--------------------------------------------------------------
Hurricane IRENE Public Advisory
000
WTNT34 KNHC 241157
TCPAT4
BULLETIN
HURRICANE IRENE INTERMEDIATE ADVISORY NUMBER 16A
NWS NATIONAL HURRICANE CENTER MIAMI FL AL092011
800 AM EDT WED AUG 24 2011
...IRENE BECOMES A CATEGORY THREE HURRICANE....EYE HEADED FOR THE
CROOKED AND ACKLINS ISLANDS...
SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...21.9N 73.3W
ABOUT 55 MI...85 KM SE OF ACKLINS ISLAND BAHAMAS
ABOUT 335 MI...540 KM SE OF NASSAU
MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...957 MB...28.26 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
THE GOVERNMENT OF THE BAHAMAS HAS CHANGED THE HURRICANE WARNING FOR
THE TURKS AND CAICOS ISLANDS TO A TROPICAL STORM WARNING.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
A HURRICANE WARNING IS IN EFFECT FOR...
* THE SOUTHEASTERN...CENTRAL...AND NORTHWESTERN BAHAMAS
A TROPICAL STORM WARNING IS IN EFFECT FOR...
* TURKS AND CAICOS ISLANDS
FOR STORM INFORMATION SPECIFIC TO YOUR AREA...PLEASE MONITOR
PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE.
DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
AT 800 AM EDT...1200 UTC...THE EYE OF HURRICANE IRENE WAS LOCATED
NEAR LATITUDE 21.9 NORTH...LONGITUDE 73.3 WEST. IRENE IS MOVING
TOWARD THE WEST-NORTHWEST NEAR 9 MPH...15 KM/H. A GRADUAL TURN
TOWARD THE NORTHWEST IS EXPECTED ON WEDNESDAY. ON THE FORECAST
TRACK...THE CORE OF IRENE WILL MOVE ACROSS THE SOUTHEASTERN AND
CENTRAL BAHAMAS TODAY AND OVER THE NORTHWESTERN BAHAMAS ON
THURSDAY.
DATA FROM AN AIR FORCE RESERVE HURRICANE HUNTER AIRCRAFT INDICATE
THAT THE MAXIMUM SUSTAINED WINDS HAVE INCREASED TO NEAR 115
MPH...185 KM/H...WITH HIGHER GUSTS. IRENE IS A CATEGORY THREE
HURRICANE ON THE SAFFIR-SIMPSON HURRICANE WIND SCALE. SOME
ADDITIONAL STRENGTHENING IS FORECAST DURING THE DAY OR SO.
HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 40 MILES...65 KM...FROM
THE CENTER...AND TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 205
MILES...335 KM. AN UNOFFICIAL REPORTING STATION AT PINE CAY IN THE
CAICOS ISLANDS RECENTLY REPORTED A WIND GUST TO 65 MPH....105 KM/H.
THE LATEST MINIMUM CENTRAL PRESSURE REPORTED BY A HURRICANE HUNTER
AIRCRAFT WAS 957 MB...28.26 INCHES.
HAZARDS AFFECTING LAND
----------------------
WIND...HURRICANE CONDITIONS ARE OCCURRING OVER PORTIONS OF THE
SOUTHEASTERN BAHAMAS. TROPICAL STORM CONDITIONS ARE EXPECTED TO
BEGIN OVER THE CENTRAL BAHAMAS THIS MORNING...WITH HURRICANE
CONDITIONS EXPECTED BY TONIGHT. TROPICAL STORM CONDITIONS ARE
EXPECTED IN THE NORTHWESTERN BAHAMAS BY LATE TONIGHT...WITH
HURRICANE CONDITIONS EXPECTED ON THURSDAY.
STORM SURGE...IN AREAS OF ONSHORE WINDS NEAR THE CENTER OF
IRENE...AN EXTREMELY DANGEROUS STORM SURGE WILL RAISE WATER LEVELS
BY AS MUCH AS 7 TO 11 FEET ABOVE NORMAL TIDE LEVELS OVER THE
CENTRAL AND NORTHWESTERN BAHAMAS...AND BY AS MUCH AS 5 TO 8 FEET
ABOVE NORMAL TIDE LEVELS OVER THE SOUTHEASTERN BAHAMAS AND THE
TURKS AND CAICOS ISLANDS. NEAR THE COAST...THE SURGE WILL BE
ACCOMPANIED BY LARGE AND DANGEROUS WAVES.
RAINFALL...IRENE IS EXPECTED TO PRODUCE ADDITIONAL RAINFALL
ACCUMULATIONS OF 1 TO 3 INCHES ACROSS PUERTO RICO AND HISPANIOLA.
ISOLATED MAXIMUM STORM TOTAL AMOUNTS OF 15 INCHES ARE POSSIBLE IN
ASSOCIATION WITH IRENE. THESE RAINS COULD CAUSE LIFE-THREATENING
FLASH FLOODS AND MUD SLIDES IN AREAS OF STEEP TERRAIN. RAINFALL
ACCUMULATIONS OF 6 TO 12 INCHES ARE EXPECTED IN THE BAHAMAS...AND
THE TURKS AND CAICOS ISLANDS.
NEXT ADVISORY
-------------
NEXT COMPLETE ADVISORY...1100 AM EDT.
$$
FORECASTER BROWN/BLAKE
http://www.nhc.noaa.gov/text/refresh/MIATCPAT4+shtml/241157.shtml?