Jump to content
  • Member Statistics

    17,609
    Total Members
    7,904
    Most Online
    NH8550
    Newest Member
    NH8550
    Joined

Hurricane Michael


wxmx

Recommended Posts

12Z Euro has a really intriguing solution for Michael. It has Michael jog westwards, then allows Leslie to capture Michael and drag Michael northeastwards. Literally two days after Leslie scrapes across eastern NS and western NL, Michael makes landfall in eastern NL.

A pretty interesting 1-2 punch to the Atlantic provinces.

I wubz 65-kt nor'easters. So hawt.

Link to comment
Share on other sites

  • Replies 120
  • Created
  • Last Reply

The big problem with that, I think, is we also need MW images to improve over Dvorak and there is an obviously limited data set for those as well.

Yep.

The pressure-wind thing is particularly complex, because wild deviations from the standard curve go very far in both directions-- and adjustments for factors like size and intensity trend can't account for all of it (as you saw in the research we worked on together).

Link to comment
Share on other sites

HURRICANE MICHAEL SPECIAL ADVISORY NUMBER 12

NWS NATIONAL HURRICANE CENTER MIAMI FL AL132012

100 AM AST THU SEP 06 2012

...MICHAEL RAPIDLY INTENSIFIES INTO A CATEGORY 2 HURRICANE...

SUMMARY OF 100 AM AST...0500 UTC...INFORMATION

----------------------------------------------

LOCATION...29.4N 42.0W

ABOUT 1045 MI...1680 KM WSW OF THE AZORES

MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H

PRESENT MOVEMENT...NE OR 50 DEGREES AT 7 MPH...11 KM/H

MINIMUM CENTRAL PRESSURE...974 MB...28.76 INCHES

WATCHES AND WARNINGS

--------------------

THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.

DISCUSSION AND 48-HOUR OUTLOOK

------------------------------

AT 100 AM AST...0500 UTC...THE CENTER OF HURRICANE MICHAEL WAS

LOCATED NEAR LATITUDE 29.4 NORTH...LONGITUDE 42.0 WEST. MICHAEL IS

MOVING TOWARD THE NORTHEAST NEAR 7 MPH...11 KM/H...AND A TURN TO THE

NORTH AND NORTH-NORTHWEST WITH A DECREASE IN FORWARD SPEED IS

EXPECTED DURING THE NEXT 48 HOURS.

SATELLITE IMAGERY INDICATES THAT MAXIMUM SUSTAINED WINDS HAVE

INCREASED TO NEAR 105 MPH...165 KM/H...WITH HIGHER GUSTS. MICHAEL

IS A CATEGORY TWO HURRICANE ON THE SAFFIR-SIMPSON HURRICANE WIND

SCALE. SOME ADDITIONAL STRENGTHENING IS FORECAST DURING THE NEXT

COUPLE OF DAYS.

HURRICANE FORCE WINDS EXTEND OUTWARD UP TO 15 MILES...30 KM...FROM

THE CENTER...AND TROPICAL STORM FORCE WINDS EXTEND OUTWARD UP TO 70

MILES...110 KM.

THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 974 MB...28.76 INCHES.

Link to comment
Share on other sites

Wow, two special advisories in 12 hr. This has gotta be one of the more difficult-to-predict hurricanes (in terms of intensity) in the past few years.

These tiny storms are incredibly difficult. Kirk and Michael alone are probably enough to completely botch the NHC's intensity forecast for the year. If the NHC has a bias, it seems that they tend to over intensify larger TCs (Isaac, Leslie, Debby) while under intensifying small TCs (Gordon, Kirk, Michael). But this fits along with the global dynamical model bias, so this is not that surprising (think Dean vs. Felix 2007).

I also want Michael to be the storm to dispels the rumor that subtropical like TCG can't ever result in a powerful hurricanes. In fact both Wilma and Rita from 2005 were spawned by non-tropical origins. For TCs it doesn't matter how they develop, it matters what environment they are engrossed in which dictates the structure.

The long dearth of major hurricanes this year is clearly about to come to an end later tonight...and given the location of Michael, it would be among the farthest northeast recorded majors aside from Kate 2003.

Kate 2003 is actually not a poor analog to the track expected for this storm, although perhaps the turn will be more subtle.

Link to comment
Share on other sites

These tiny storms are incredibly difficult. These Kirk and Michael alone are probably enough to completely botch the NHC's intensity forecast for the year. If the NHC has a bias, it seems that they tend to over intensify larger TCs (Isaac, Leslie, Debby) while under intensifying small TCs (Gordon, Kirk, Michael).

You have made a very astute observation. I think part of the challenge lies in the fact that large storms have their own eccentricities as well; for instance, factors in the boundary layer such as upwelling due to fetch play a much larger role in inner-core dynamics in large systems like Earl 2010 or Ophelia 2005. In those cases, large-scale synoptic as well as mesoscale factors would come equally into play, while in smaller systems the latter might have an even greater influence on intensity trends. The formation of outer eye walls might be easier to predicate in smaller than in larger systems due to complex, large-scale interactions with the surrounding air mass in large tropical cyclones. The dry-air entrainment in both Isaac and Leslie, each a large TC, is a prime example. (Leslie also faces widespread upwelling due to its large fetch, while a smaller TC would have a pronounced upwelling over only a limited area.)

I also want Michael to be the storm to dispels the rumor that subtropical like TCG can't ever result in a powerful hurricanes. In fact both Wilma and Rita from 2005 were spawned by non-tropical origins. For TCs it doesn't matter how they develop, it matters what environment they are engrossed in which dictates the structure.

Kate 2003 is actually not a poor analog to the track expected for this storm, although perhaps the turn will be more subtle.

Agreed it is. In the case of Michael, the TC appears to be positioned in a sink zone that, combined with the ascent provided by the weak upper low to the west, is aiding intensification and, through divergence, is offsetting the potential shear produced by the upper anticyclone over Leslie to the southwest. The warmer upper-level air mass near the upper low, combined with the sink, is also helping Michael establish its own anticyclone, thereby facilitating pressure drops and the formation of a well-defined, small eye.

In my opinion, Gordon had higher than the 110mph winds the NHC said he had. So theres major #1. ACE is taking a hit this year by truly puzzling NHC advisory intensities. I still don't know how they said Michael was 75mph 3 hours ago and got away with it. Guess since he wasn't forecast to be that strong they have to compensate by lowballing the initial intensity to help out with the end of season forecast error. Shame.

Right. And the NHC deliberately fabricated the threat of Isaac to the Tampa area in order to influence political donations.

I will see you later in the Twilight Zone.

Link to comment
Share on other sites

And we have the first major of the year

BULLETIN

HURRICANE MICHAEL ADVISORY NUMBER 13

NWS NATIONAL HURRICANE CENTER MIAMI FL AL132012

500 AM AST THU SEP 06 2012

...MICHAEL BECOMES THE FIRST CATEGORY THREE HURRICANE OF THE YEAR...

SUMMARY OF 500 AM AST...0900 UTC...INFORMATION

----------------------------------------------

LOCATION...29.6N 41.7W

ABOUT 1020 MI...1645 KM WSW OF THE AZORES

MAXIMUM SUSTAINED WINDS...115 MPH...185 KM/H

PRESENT MOVEMENT...NE OR 45 DEGREES AT 7 MPH...11 KM/H

MINIMUM CENTRAL PRESSURE...965 MB...28.50 INCHES

Link to comment
Share on other sites

Michael being so strong should pull Leslie east of Bermuda missing the isanf for the most part, wouldn't it?

Interaction between lows (Fujiwhara interaction) is more a function of distance and size, and less so of intensity. Distance is big, so no interaction really, and if there was any, Leslie's size would cancel any intensity difference and make Michael it's b**ch.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.

×
×
  • Create New...