NWS Jackson, KY wrote its last area forecast discussion before the first event at Mar 30, 1:45 PM EST, 45 minutes earlier.
Area forecast discussion, Mar 30, 1:45 PM EST, 45 minutes before
AREA FORECAST DISCUSSION...UPDATED
National Weather Service Jackson KY
245 PM EDT Sat Mar 30 2019
.UPDATE...
Issued at 245 PM EDT SAT MAR 30 2019
Updated the grids mainly to fine tune temperatures and dewpoints
through the rest of the afternoon - higher temps and lower dews
are leading to lower RH values, as well. Also tweaked the PoPs
and thunder chances through evening per the latest guidance from
the CAMs and SPC-HRRR. Winds were increased with deeper mixing
leading to higher gusts over our western counties currently. On
account of this, have also updated the Fire Wx forecast and the
wildfire spots that are active this afternoon. The updated grids
have been sent to the NDFD and web servers.
UPDATE Issued at 1115 AM EDT SAT MAR 30 2019
14z sfc analysis shows strong WAA underway over eastern Kentucky in
the warm sector of a developing sfc low to the north and ahead of
an approaching cold front to the northwest. This is supporting
winds out of the south to southwest at 10 to 20 mph with gusts up
to 30 mph possible - mainly west - through the afternoon. On
radar, a few showers are tracking through our northwest counties
with others poised to affect western parts early this afternoon,
while the east will be mainly dry per the latest CAMs.
Temperatures have rebounded to well into the mid and upper 60s
across eastern Kentucky under partly to mostly cloudy skies.
Dewpoints, meanwhile, range from the low 50s west to the mid 40s
east. For this afternoon and into the evening have kept the Wx
grids mostly clean with showers and any storms mostly expected to
stay west through sunset. Did beef up the thunder wording for the
HWO given the upgrade for our western counties to marginal risk
for severe storms from SPC - owing to a good wind field and
potential for a bit more instability around this afternoon.
However, for our area we will likely have to wait for the front
to get closer to sustain storms so the threat drops off quickly to
the east with time this evening. Did update the grids with the
above thoughts reflected and also to add in the latest obs and
trends to the T/Td ones - noting that dewpoints are slow to
increase so far this morning. The grids have bee sent to the NDFD
and web servers along with an updated set of zones and HWO.
UPDATE Issued at 805 AM EDT SAT MAR 30 2019
Radar mosaic continues to show very light echos across the area
this morning. A quick look at surface obs indicates little if any
of this activity is reaching the ground. However, radar trends
indicate that some returns may become strong enough across the
north to warrant an extention of PoPs for a few more hours before
a lull in activity sets in. HRRR has suggested activity should
weaken as it pushes eastward but this goes against trends. Will be
making the necessary adjustments and bring grids in line with
current conditions.
&&
.SHORT TERM...(Today through Sunday)
Issued at 519 AM EDT SAT MAR 30 2019
Surface analysis shows a frontal zone to our north across the
Midwest and Great Lakes region. High pressure to our east and low
pressure to our west will tighten up the surface pressure gradient
across the Ohio Valley today, producing some gusty southerly
winds across our area today. Some weak isentropic lift is evident
in some of the higher resolution models and isolated to widely
scattered returns on regional radar would support that idea. This
activity will wane through the early morning as support lifts
further north.
Models appear to be in good agreement. Low pressure to our west
will deepen slightly and move northeast into the Great Lakes in
response to a mid/upper level trough dropping out of Canada. Some
southern stream energy will phase with the trough, complicating
the surface pattern just a bit and possibly delaying the cold
fronts advance slightly. The surface cold front is expected to
push across our forecast area tonight, entering our CWA by around
8 this evening. The frontal boundary is quite progressive and
could be to the east of our area by as early Sunday morning.
Ahead of the front we will gradually moisten up. NAM and GFS
steepen up the boundary layer lapse rates considerably by this
afternoon (>7 C/km), suggesting some sunshine and destabilization
through a good part of the day. Mid level lapse rates are not far
behind but are more moderate (~6-6.5 C/km). MUCAPE and shear are
marginal over our area but are higher to our west supporting a
better threat for thunderstorms. The Storm Prediction has issued a
reasonable Marginal threat for severe thunderstorms across central
portions of the Commonwealth as a result. This area reaches just
up to some of our southwestern most counties. We will be
monitoring in the event that area expands futher eastward into
our CWA more proper.
Sensible weather features a spike in afternoon highs today,
solidly into the mid 70s, supported by a little sunshine and some
gusty southwest winds. As inferred, trends in model solutions and
guidance suggests we could see a bit of sun through the first
half of the day. But more robust cloud cover will overspread the
area by this afternoon as the threat of showers and isolated to
scattered thunderstorms increases. We are not expecting anything
severe at this time, but with the marginal threat just to our west
we probably could not rule out an isolated strong storm to the
west of I-75. The threat does not appear to be high enough to
mention in other products for now but will monitor for changes.
Much colder and drier air will invade eastern Kentucky behind
the cold front tonight. Temperature will drop into the 30s
tonight and only climb into the mid 40s Sunday. But the weather
will be fair with plenty of sunshine by Sunday afternoon, after
morning clouds scour out from the exiting storm system.
.LONG TERM...(Sunday night through Friday)
Issued at 519 AM EDT SAT MAR 30 2019
An area of surface high pressure will progress east and crest
across eastern Kentucky Sunday night into Monday morning. This
will lead to a hard freeze and the potential for widespread frost,
with low temperatures in the low to mid 20s in the valleys and mid
to upper 20s on the ridges. Given some areas already have crops
susceptible to freezing temperatures have hoisted a Freeze Watch
for area generally south of I-64 from 3z to 14z Monday. This
surface high pressure will remain in place Monday and will lead to
a clear and calm day. There is some uncertainty for frost or
colder temperatures for Monday night, as the surface high
progresses east and a upper level wave ejects east out of the
Southern Plains. Given this didn’t include frost Monday night
due to the potential for some high clouds from this upper level
feature and high shifting east allowing for a bit more mixing. The
soundings indicate some lower clouds are also possible by Tuesday
night leading to a lower chance for frost in the far east, so will
keep better chances in in the western parts of the CWA.
After this period of colder overnight low temperatures, the
temperatures warm Wednesday into Thursday under the influence of
upper level ridging and surface high pressure. The next feature of
interest will be a developing surface low and upper level trough
axis moving east out of the Plains Thursday night into Friday.
There remain some model inconsistencies on the location of the
surface low and the development of the trough axis and this will
have implications on the sensible weather. There is enough
agreement to keep chance to likely POPs, as surface low and cold
front track across the Ohio Valley. Given some instability and
decent mid-level lapse rates did add slight thunder for Friday
afternoon, but given the cloud cover couldn’t go much more than
slight at this time.
&&
.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
ISSUED AT 220 PM EDT SAT MAR 30 2019
Generally looking at VFR conditions through the first part of the
aviation forecast. Flight conditions will deteriorate into MVFR
territory after sunset as a cold front pushes through the region,
producing widespread showers. Included a mention of thunder at
our southern and western most terminals where instability will be
best early this evening. Otherwise, strong gradient south to
southwest winds can be anticipated ahead of the approaching cold
front, to between 10 and 15 kts with gusts to between 25 and 35
kts. These winds will switch to the northwest with the passing of
the front and fairly quickly diminish to between 10 and 20 kts
late this evening. The post frontal, lower cigs will break up
Sunday morning from west to east while wind will be northwest at
around 10 kts.
&&
.JKL WATCHES/WARNINGS/ADVISORIES...
Freeze Watch from Sunday evening through Monday morning for
KYZ058>060-068-069-079-080-083>088-104-106>120.
&&
UPDATE...GREIF
SHORT TERM...RAY
LONG TERM...DJ
AVIATION...RAY/GREIF
Hazardous weather outlook, Mar 30, 2:10 PM EST, 20 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Jackson KY
310 PM EDT Sat Mar 30 2019
KYZ058>060-068-069-079-080-083>088-104-106>120-312215-
Estill-Powell-Menifee-Rockcastle-Jackson-Pulaski-Laurel-Wayne-
McCreary-Whitley-Knox-Bell-Harlan-Elliott-Morgan-Johnson-Wolfe-
Magoffin-Floyd-Lee-Breathitt-Knott-Owsley-Perry-Clay-Leslie-
Letcher-Martin-Pike-
Including the cities of Irvine, Ravenna, Clay City, Stanton,
Frenchburg, Brodhead, Mount Vernon, McKee, Annville, Burnside,
Somerset, London, Monticello, Stearns, Whitley City, Corbin,
Williamsburg, Barbourville, Middlesboro, Pineville, Cumberland,
Harlan, Sandy Hook, West Liberty, Paintsville, Campton,
Salyersville, Prestonsburg, Wheelwright, Beattyville, Jackson,
Hindman, Pippa Passes, Booneville, Hazard, Manchester, Hyden,
Jenkins, Whitesburg, Inez, Coal Run, Elkhorn City, Pikeville,
and South Williamson
310 PM EDT Sat Mar 30 2019
...FREEZE WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
MORNING...
This hazardous weather outlook is for portions of eastern Kentucky.
.DAY ONE...Tonight.
Through early evening gusty southwest winds will bring winds of
between 30 and 35 mph to the area. Combined with relative
humidities falling into the 30s there will be an enhanced fire
risk through sunset.
Thunderstorms are possible into this evening as a strong cold
front moves through the region. A few of the storms this evening
could be strong with damaging wind gusts the main threat.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
A hard freeze is expected Sunday evening through Monday morning.
Frost will also be possible Tuesday night into Wednesday morning.
Thunderstorms are possible on Friday afternoon.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not anticipated.
KYZ044-050>052-312215-
Fleming-Montgomery-Bath-Rowan-
Including the cities of Flemingsburg, Camargo, Jeffersonville,
Mount Sterling, Owingsville, and Morehead
310 PM EDT Sat Mar 30 2019
This hazardous weather outlook is for portions of eastern Kentucky.
.DAY ONE...Tonight.
Through early evening gusty southwest winds will bring winds of
between 30 and 35 mph to the area. Combined with relative
humidities falling into the 30s there will be an enhanced fire
risk through sunset.
Thunderstorms are possible into this evening as a strong cold
front moves through the region. A few of the storms this evening
could be strong with damaging wind gusts the main threat.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Frost and freezing temperatures are expected Sunday night. Frost
will also be possible Tuesday night into Wednesday morning.
Thunderstorms are possible Friday afternoon.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not anticipated.
RAY/GREIF