Weather News & Tropical Update with J7409 Tues. 7- 10- 18

824 views · Published 10 July 2018 · 13:39 · Indexed 25 September 2026

Channel: J7409 · 2018 · Science & Technology

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Weather News & Tropical Update with J7409 Tues. 7-10-18
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Chris........
The satellite presentation of Chris has improved overnight with an
increase in convective banding and the recent development of a
banding eye.  An earlier NOAA and an overnight Air Force Reserve
aircraft have noted the presence of a ragged 25 n mi wide eye, which
can also be seen in NWS WSR-88D radar imagery from Morehead City,
North Carolina.  Despite the increase in organization the Air Force
aircraft did not find winds to support hurricane strength.  In
fact, the plane only measured peak 850 mb flight level winds of 66
kt and SFMR winds of around 50 kt.  However, there is likely some
undersampling as the plane only made one pass through each quadrant.
Therefore the initial remains 60 kt, which is compromise between
the most recent satellite estimates and the lower reconnaissance
data.  The aircraft did report that the pressure has fallen to 993
mb.

Recent satellite and aircraft fixes suggest that Chris may be
beginning its much anticipated northeastward motion, albeit very
slow at the moment.  A large mid-latitude trough is forecast to drop
southeastward over eastern Canada and the northeastern United States
which should begin to steer Chris on a faster northeastward heading
over the next day or so.  As the trough deepens, Chris should
accelerate further as it becomes embedded within deep-layer
southwesterly flow ahead of the trough.  Chris is forecast to pass
well southeast of Nova Scotia in a couple of days, then move near
or over southeastern Newfoundland in about 72 hours.  The track
guidance remains in good agreement on this scenario, but some
speed differences remain.  The updated NHC track forecast is
similar to the previous advisory and lies between the slower ECMWF
and the various consensus aids.

As Chris begins to move northeastward, it will be leaving the area
of upwelled cooler waters and traversing warm SSTs during the
next 24 to 36 h.  This should result in strengthening and Chris is
expected to become a hurricane later today.  By 48 h, Chris will be
moving over colder waters north of the Gulf Stream and begin
interacting with a frontal system.  Extratropical transition is
expected to be complete in about 60-72 h, and the extratropical low
is forecast to gradually weaken after passing Newfoundland.  The
new NHC intensity forecast is closest to the Florida State
Superensemble, which is a little higher than the statistical
guidance.
Beryl................
The remnants of Beryl are producing strong gusty winds and areas of
heavy rain over Puerto Rico, portions of Hispaniola, and the
adjacent Atlantic and Caribbean waters.  This system is expected to
move west-northwestward across Hispaniola this morning and over the
southeastern Bahamas later today.  Little development is expected
during the next day or so due to land interaction and unfavorable
upper-level winds.  The disturbance is forecast to turn northward
over the western Atlantic on Wednesday where upper-level winds could
become a little more conducive for the regeneration of a tropical
cyclone later this week.  Regardless of development, locally heavy
rains and gusty winds are likely over portions of Hispaniola and the
Bahamas as the remnants of Beryl move through those areas.

General Weather............
Tropical Storm Chris is currently stalled offshore of the Carolinas and is
anticipated to strengthen to a Hurricane this afternoon and then track to
the northeast. While much of the heaviest rainfall should stay well
offshore, outer rain bands from Chris may clip the Outer Banks of North
Carolina. WPC has a marginal risk for excessive rainfall in effect for
southeast Virginia and northeast North Carolina. Strong winds associated
with Chris will cause dangerous surf and rip-currents up the Mid-Atlantic
coast.   A low pressure system will lift up of the Rockies and move across the
Northern High Plains and into the Upper Mississippi Valley and Great lakes
regions over the next few days. This front will be a focus for strong
convection to develop from Montana to Wisconsin.  Showers and thunderstorms will be on the increase across portions of the
Southwest and Southern Rockies as  monsoonal moisture advects northward.
Heavy rainfall and flash flooding will be possibility, especially for
areas of higher terrain or flood prone regions. WPC has a marginal to
slight risk for much of this region on its excessive rainfall outlooks.
Scattered showers and thunderstorms will persist over the next few days
over the Gulf states and the Southeast as Gulf moisture overrides a
decaying frontal boundary.

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