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Post Tropical Storm Andrea


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TROPICAL STORM ANDREA SPECIAL DISCUSSION NUMBER   1
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL012013
600 PM EDT WED JUN 05 2013

THE AIR FORCE RESERVE RECONNAISSANCE AIRCRAFT INVESTIGATING THE
LARGE AREA OF DISTURBED WEATHER OVER THE EASTERN GULF OF MEXICO HAS
FOUND A CIRCULATION CENTER LOCATED NEAR THE WESTERN EDGE OF THE
LARGE MASS OF THUNDERSTORMS.  THIS CENTER APPEARS TO HAVE FORMED
VERY RECENTLY SO THE INITIAL MOTION ESTIMATE IS UNCERTAIN.
THE AIRCRAFT MEASURED AN EXTRAPOLATED SURFACE PRESSURE OF 1002
MB...PEAK 1000 FT FLIGHT-LEVEL WINDS OF 47 KT...AND BELIEVABLE
BIAS-CORRECTED SFMR SURFACE WINDS OF AROUND 35 KT.  THESE DATA
SUPPORT AN INITIAL INTENSITY OF 35 KT.  STRONG SOUTHWESTERLY SHEAR
IS EXPECTED TO CONTINUE DURING THE NEXT COUPLE OF DAYS AND
SIGNIFICANT STRENGTHENING APPEARS UNLIKELY.  THE INTENSITY FORECAST
SHOWS LITTLE OVERALL CHANGE IN STRENGTH...EVEN AFTER THE SYSTEM
BECOMES EXTRATROPICAL IN 2 TO 3 DAYS.

ANDREA IS FORECAST TO MOVE SLOWLY NORTHWARD TONIGHT...THEN
ACCELERATE NORTHEASTWARD ON THURSDAY AHEAD OF A MID- TO UPPER-LEVEL
TROUGH MOVING INTO THE SOUTHEASTERN UNITED STATES.  THE GLOBAL
MODELS ARE IN GOOD AGREEMENT ON THIS GENERAL SCENARIO...ALTHOUGH
THEY ALSO SUGGEST THE POSSIBILITY OF JUMPS OR REFORMATIONS OF THE
CENTER DURING THE NEXT 24 HOURS.  LANDFALL ALONG THE COAST OF THE
FLORIDA BIG BEND ON THURSDAY AFTERNOON OR EVENING IS EXPECTED.
AFTER THAT...THE SYSTEM IS FORECAST TO ACCELERATE NORTHEASTWARD
ALONG THE COAST OF THE SOUTHEAST UNITED STATES.  THERE WILL BE SOME
BAROCLINIC FORCING BY THAT TIME...BUT IT IS UNCLEAR WHEN ANDREA
WILL BECOME POST-TROPICAL.  THE NHC FORECAST SHOWS ANDREA REMAINING
A TROPICAL CYCLONE THROUGH 48 HOURS...BUT THE TRANSITION TO A
POST-TROPICAL CYCLONE COULD OCCUR SOONER.

THE CURRENT FORECAST REQUIRES THE ISSUANCE OF A TROPICAL STORM
WARNING ALONG THE WEST COAST OF THE FLORIDA PENINSULA AND A
TROPICAL STORM WATCH ALONG THE SOUTHEAST UNITED STATES COAST. THE
PRIMARY EFFECTS FROM ANDREA ARE EXPECTED TO BE HEAVY RAINFALL
ACROSS MUCH OF THE FLORIDA PENINSULA...STORM SURGE FLOODING ALONG
PORTIONS OF THE WEST COAST OF FLORIDA...AND ISOLATED TORNADOES LATE
TONIGHT AND THURSDAY ACROSS THE FLORIDA PENINSULA.

THE PRONUNCIATION OF THIS NAME IS ANN- DREE UH.

FORECAST POSITIONS AND MAX WINDS

INIT  05/2200Z 25.3N  86.5W   35 KT  40 MPH
12H  06/0600Z 26.5N  86.4W   35 KT  40 MPH
24H  06/1800Z 28.3N  85.0W   40 KT  45 MPH
36H  07/0600Z 31.0N  82.0W   40 KT  45 MPH...INLAND
48H  07/1800Z 34.5N  78.5W   40 KT  45 MPH...INLAND
72H  08/1800Z 43.0N  67.5W   40 KT  45 MPH...POST-TROP/EXTRATROP
96H  09/1800Z 45.0N  48.0W   40 KT  45 MPH...POST-TROP/EXTRATROP
120H  10/1800Z 47.0N  25.0W   40 KT  45 MPH...POST-TROP/EXTRATROP

$$
FORECASTER BROWN

 

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625 PM EDT WED JUN 5 2013

...TROPICAL STORM ANDREA DEVELOPS IN THE GULF OF MEXICO...

.NEW INFORMATION...
A TROPICAL STORM WATCH HAS NOW BEEN ISSUED.

.AREAS AFFECTED...
THIS LOCAL STATEMENT PROVIDES IMPORTANT INFORMATION AND
RECOMMENDED ACTIONS FOR PEOPLE AND MARINE INTERESTS IN SELECT
LOCATIONS AND COASTAL WATERS OF SOUTHEAST NORTH CAROLINA...
NORTHEAST SOUTH CAROLINA AND ADJACENT COASTAL WATERS.

.WATCHES/WARNINGS...
A TROPICAL STORM WATCH IS IN EFFECT FOR THE FOLLOWING LOCATIONS...
INLAND PENDER...COASTAL PENDER...INLAND NEW HANOVER...COASTAL NEW
HANOVER...INLAND BRUNSWICK...COASTAL BRUNSWICK...INLAND HORRY...
COASTAL HORRY...INLAND GEORGETOWN AND COASTAL GEORGETOWN.

FOR MARINE INTERESTS...A TROPICAL STORM WATCH IS IN EFFECT FOR
PORTIONS OF ATLANTIC COASTAL WATERS.

A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE NEXT 48 HOURS SOMEWHERE WITHIN THE SPECIFIED
AREAS.

ALL PERSONS IN THE WATCH AREAS SHOULD REVIEW THEIR PREPAREDNESS
PLAN AND BE READY TO IMPLEMENT IT SHOULD A WARNING BE ISSUED FOR
THEIR AREA.

IN ORDER TO MAKE THE BEST DECISIONS...BE SURE THAT YOU UNDERSTAND
THE TERMINOLOGY AND DEFINITIONS ASSOCIATED WITH TROPICAL CYCLONE
EVENTS.

.STORM INFORMATION...
AT 6 PM EDT...THE CENTER OF TROPICAL STORM ANDREA WAS LOCATED
NEAR LATITUDE 25.3 NORTH...LONGITUDE 86.5 WEST. THIS WAS ABOUT 810
MILES SOUTHWEST OF WILMINGTON NC...OR ABOUT 740 MILES SOUTHWEST OF
MYRTLE BEACH SC. STORM MOTION WAS NORTH OR 360 DEGREES AT 3 MPH.
STORM INTENSITY WAS 40 MPH.

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THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

 
 
 
* TORNADO WARNING FOR...
 
  MIDDLE KEYS IN MONROE COUNTY IN FLORIDA...
 
  THIS INCLUDES THE COMMUNITIES OF...EAST END OF SEVEN MILE BRIDGE...
 
  MARATHON...
 
 
 
* UNTIL 1145 PM EDT
 
 
 
* AT 1058 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
 
  VIOLENT WATERSPOUT 11 MILES SOUTHEAST OF MARATHON...MOVING NORTH AT
 
  20 MPH.
 
 
 
* THE TORNADO WILL BE NEAR...
 
  MARATHON...BOOT KEY AND EAST END OF SEVEN MILE BRIDGE
 
  KNIGHT KEY
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THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

 
 
 
* TORNADO WARNING FOR...
 
  MIDDLE KEYS IN MONROE COUNTY IN FLORIDA...
 
  THIS INCLUDES THE COMMUNITIES OF...EAST END OF SEVEN MILE BRIDGE...
 
  MARATHON...
 
 
 
* UNTIL 1145 PM EDT
 
 
 
* AT 1058 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
 
  VIOLENT WATERSPOUT 11 MILES SOUTHEAST OF MARATHON...MOVING NORTH AT
 
  20 MPH.
 
 
 
* THE TORNADO WILL BE NEAR...
 
  MARATHON...BOOT KEY AND EAST END OF SEVEN MILE BRIDGE
 
  KNIGHT KEY

 

That feeder band means business, looks like besides the 2 main circulations in the keys the ones to the NW are developing. 

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here's the 4-panel shot off of the Key West Radar at 0320z, focused on the Marathon area. 3-4 tornadic/waterspout cells on it. including a strong cell with maybe small hail headed towards marathon.top left 0.5 reflectivity, top right SRV, KDP 0.5 bottom left, cc 0.5 bottom right.

 

post-2758-0-57042200-1370489372_thumb.pn

 

 

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