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What is the Saffir-Simpson Scale of hurricane categories?

Update-2 2013-05-30: Tropical depression Barbara has become disorganized and is dissipating.

Update 2013-05-30: Hurricane Barbara has collapsed over land and is now a tropical depression. However, the potential exists for it to reform as a cyclone over the Gulf of Mexico as it emerges from the land.

Update 2013-05-29: Tropical Storm Barbara became a Category 1 hurricane today.

AVN false colour image. Click image for current loop Courtesy NOAA.

Visble satellite view. Click image for current loop. Coutesu NOAA

WTPZ32 KNHC 302031
TCPEP2

BULLETIN
REMNANTS OF BARBARA ADVISORY NUMBER 10
NWS NATIONAL HURRICANE CENTER MIAMI FL EP022013
200 PM PDT THU MAY 30 2013

…BARBARA DISSIPATES…
…THIS IS THE LAST ADVISORY…

SUMMARY OF 200 PM PDT…2100 UTC…INFORMATION
———————————————-
LOCATION…18.5N 94.5W
ABOUT 25 MI…40 KM NNW OF COATZACOALCOS MEXICO
MAXIMUM SUSTAINED WINDS…25 MPH…35 KM/H
PRESENT MOVEMENT…NNW OR 340 DEGREES AT 3 MPH…6 KM/H
MINIMUM CENTRAL PRESSURE…1005 MB…29.68 INCHES

WATCHES AND WARNINGS
——————–
THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.

DISCUSSION AND 48-HOUR OUTLOOK
——————————
SATELLITE IMAGES AND SURFACE OBSERVATIONS INDICATE THAT BARBARA NO
LONGER HAS A WELL-DEFINED CENTER OF CIRCULATION…AND IS THEREFORE
NO LONGER A TROPICAL CYCLONE.

AT 200 PM PDT…2100 UTC…THE CENTER OF THE REMNANTS OF BARBARA WAS
LOCATED NEAR LATITUDE 18.5 NORTH…LONGITUDE 94.5 WEST. THE
REMNANTS ARE MOVING TOWARD THE NORTH-NORTHWEST AT 3 MPH…6 KM/H.

MAXIMUM SUSTAINED WINDS ARE NEAR 25 MPH…35 KM/H…WITH HIGHER
GUSTS.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1005 MB…29.68 INCHES.

HAZARDS AFFECTING LAND
———————-
RAINFALL…THE REMNANTS OF BARBARA ARE EXPECTED TO PRODUCE
ADDITIONAL RAINFALL AMOUNTS OF 3 TO 5 INCHES ACROSS PORTIONS OF
SOUTHEASTERN MEXICO…BRINGING STORM TOTALS IN EXCESS OF 25 INCHES.
THESE RAINS COULD CAUSE LIFE-THREATENING FLASH FLOODS AND MUD
SLIDES.

NEXT ADVISORY
————-
THIS IS THE LAST PUBLIC ADVISORY ISSUED BY THE NATIONAL HURRICANE
CENTER ON BARBARA. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE
FOUND IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
SERVICE…UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.

WTPZ42 KNHC 302031
TCDEP2

REMNANTS OF BARBARA DISCUSSION NUMBER 10
NWS NATIONAL HURRICANE CENTER MIAMI FL EP022013
200 PM PDT THU MAY 30 2013

THREE SURFACE OBSERVING SITES NEAR COATZACOALCOS MEXICO HAVE BEEN
PERSISTENTLY REPORTING WINDS FROM THE SOUTH TO SOUTHWEST…YET
HIGH-RESOLUTION VISIBLE SATELLITE IMAGES HAVE BEEN SUGGESTING A
WEAK CIRCULATION CENTERED TO THE EAST OF THESE SITES. APPARENTLY
THE LATTER CIRCULATION IS EITHER NOT AT THE SURFACE OR IS EXTREMELY
WEAK AND ILL DEFINED. SINCE BARBARA DOES NOT HAVE A WELL-DEFINED
CENTER OF SURFACE CIRCULATION AND LACKS SUFFICIENT ORGANIZED DEEP
CONVECTION…IT NO LONGER QUALIFIES AS A TROPICAL CYCLONE…AND
ADVISORIES ARE BEING DISCONTINUED. OUR OPERATIONAL ASSESSMENT IS
THAT BARBARA DID NOT MAKE IT INTO THE GULF OF MEXICO AS A TROPICAL
CYCLONE.

ALTHOUGH THE CYCLONE HAS DISSIPATED…DISTURBED WEATHER ASSOCIATED
WITH THE REMNANTS OF BARBARA IS LIKELY TO PERSIST OVER SOUTHEASTERN
MEXICO AND PORTIONS OF CENTRAL AMERICA FOR THE NEXT SEVERAL
DAYS…AND A HEIGHTENED RISK OF DANGEROUS FLOODING AND MUD SLIDES
WILL CONTINUE OVER THIS REGION.

FORECAST POSITIONS AND MAX WINDS

INIT 30/2100Z 18.5N 94.5W 20 KT 25 MPH…REMNANTS
12H 31/0600Z…DISSIPATED

_______________________________________________
Follow more general hurricane info at Atlantic and Eastern Pacific Hurricane Activity 2013

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While watching storms is exciting, wonderous and exhilarating, living with the reality of their awesome power, is not. Pray for the folks of Moore, Oklahoma, they will need a long time to heal and recover.

2013-05-20: NEXRAD radar trace from KTLX east of Moore, Oklahoma, and just prior to the tornado moving into town The classic tornadic curl of this EF4-5 tornado is clealy evident. The purple core of the tornado is known as a “debris ball” – the amount of debris sucked up into the tornado produces a high reflectivity signal, and is sadly characteristic of a violent on-the-ground tornado. Moore is in the open space to the right(east) of the debris ball. Image courtesy “rrick8”, posted at 3:20PM 2013-05-20 at grlevelX.com.

Update:2013-05-17: Tropical Storm Alvin in the eastern Pacific… and Alvin poops to a trough. Alvin! ALVIN! (with apologies to The Chipmunks…)

Tropical Storm Alvin in the eastern Pacific, east of Central America and well offshore, is this season’s first named storm. With a track to the northwest, little impact is expected. As of this morning windspeeds are approximately 50mph and are expected to strengthen to Category 1 hurricane strength over the next day or so.

For more info about current hurricane activity follow Atlantic and eastern Pacific Hurricane Activity 2013.

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