Area Forecast Discussion
Issued by NWS Jackson, KY

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FXUS63 KJKL 271405
AFDJKL

Area Forecast Discussion
National Weather Service Jackson KY
1005 AM EDT FRI MAY 27 2016

.UPDATE...
Issued at 1005 AM EDT FRI MAY 27 2016

Clouds have clear out this morning and we are left with mostly
sunny skies. Otherwise expecting more in the way of isolated to
scattered afternoon showers and thunderstorms today. Right now
HRRR keeps activity minimal till late afternoon, meanwhile the
ARW/NMM want to develop activity perhaps a bit earlier. Overall
coverage wise the SSEO data would suggest far SE near the VA
border and that seems reasonable given a more orographic lift
scenario. Given little if any steering flow based on forecast
soundings these would be slow movers but would slowly progress
north through the late afternoon and evening.

UPDATE Issued at 803 AM EDT FRI MAY 27 2016

Have blended early morning obs into the forecast, with no
substantive changes.

&&

.SHORT TERM...(Today through Saturday)
Issued at 410 AM EDT FRI MAY 27 2016

We remain in a stagnant pattern which is slow to change. Upper
level ridging was over the southeast ConUS, and a large trough
over the western ConUS. Near the periphery of the ridge, we are
seeing rounds of convection at times. Convection tends to build
once daytime destabilization occurs, but may also occur in a less
intense fashion during the night and morning. Features responsible
for focusing convection are subtle, making detailed forecasting
difficult. That being said, have made a best attempt at it using
a blend of model solutions. Light showers ongoing over the
northern part of the JKL forecast area early this morning
shouldn`t amount to much. Models suggest convection will initiate
with destabilization over the higher terrain of the Appalachians
today, and then propagate northward in weak steering currents
during the late afternoon and evening. This activity dies out
during the night. Next, a plume of deeper moisture rotating around
the large scale trough to our west will makes its way east across
KY tonight and Saturday. This is the feature favored for our next
round of convective development, with the best chance on Saturday
being in our northern and western counties.

.LONG TERM...(Saturday night through Thursday)
Issued at 325 AM EDT FRI MAY 27 2016

At upper levels, a shortwave trough is expected to lift out of
the plains into the Great Lakes region Sunday. Energy from this
shortwave trough should move into the region, bringing the
potential for more widespread showers over the weekend.
Interestingly enough, the first tropical system of the hurricane
season appears to form just off the carolina coast and move
onshore on Sunday as well. Due to a high block in the Atlantic,
this subtropical low will be stagnant over the Carolinas through
the first half of the new work week. Eastern Kentucky will likely
be stuck between active weather over the plains and rain along the
East Coast. However, afternoon showers and thunderstorms will be
possible almost every day with peak heating. Tuesday looks to be
the driest day as high pressure builds over Kentucky.

Another shortwave trough and low pressure system embedded in the
northern stream is progged to traverse the northern CONUS during
the second half of the week with energy potentially extending
southward and moving across our area. This system may be enough to
kick the subtropical system out of the Carolinas, or could ingest
its energy and bring it towards our region. Either way, there is
still too much model to model discontinuity regarding these
features to have much confidence in the forecast. The best
confidence belongs to the weekend period where both GFS and ECMWF
models show more frequent showers as the upper trough passes by to
our northwest.

Temperatures will be more summer-like throughout the extended
period with highs in the lower 80s and lows in the lower 60s. The
normal high temperature for this time of year is in the upper 70s.

&&

.AVIATION...(For the 12Z TAFS through 12Z Saturday morning)
ISSUED AT 803 AM EDT FRI MAY 27 2016

VLIFR conditions due to fog were affecting some valley locations
early this morning, but TAF sites were VFR. Fog will dissipate
shortly, with all locations expected to be VFR by late this
morning. After heating and destabilization today, scattered
showers and thunderstorms are expected to develop in the
afternoon and spread northward, before dissipating in the
evening.

&&

.JKL Watches/Warnings/Advisories...
None.
&&

$$

UPDATE...DJ
SHORT TERM...HAL
LONG TERM...JVM
AVIATION...HAL



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.