421
FXUS61 KRLX 171610
AFDRLX

AREA FORECAST DISCUSSION
National Weather Service Charleston WV
1210 PM EDT Mon Jun 17 2024

.SYNOPSIS...
A prolonged heat wave builds throughout the week. Isolated
showers or storms will be possible today and Tuesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
As of 1050 AM Monday...

Increased PoPs across the northeast to better reflect current
radar trends.

As of 625 AM Monday...

Showers and a few storms have developed within the northern
half of the CWA this morning. Have freshened up PoPs to reflect
the precipitation coverage seen on radar.

As of 300 AM Monday...

Key Point:
* Heat indices will reach the lower 100s across parts of the
  lowlands this afternoon.
* Heat Advisory begins late this morning.

While high pressure will be present in the upper levels, a surface
front crosses the area early this morning and brings the possibility
of a shower or two as it moves through. Following the departure
of the front, moisture and very warm air are expected to feed
into the area while upper level high pressure remains in place
overhead. Isolated to scattered showers and thunderstorms may
begin to develop as heat and humidity create unstable conditions
this afternoon and evening. While forecast soundings show an
impressive amount of CAPE, shear should be modest. A few storms
could become strong, with heavy rain also a possibility as
precipitable water values rise into the 1.5 to 2 inch range.
Any convective activity will taper off with the loss of daytime
heating, then quieter conditions are expected overnight.

High temperatures are projected to climb into the 90s across much of
the lowlands and mid 70s to 80s along the mountains. The heat
index will be even higher, with low 100s possible for portions
of the lowlands this afternoon. A Heat Advisory begins late
this morning and then continues beyond the near term period as
a heat wave persists for much of the week.

Heat safety will be important this week, so here are a few tips:
* Drink plenty of fluids
* Wear light, loose fitting clothing
* Take breaks in the shade or air conditioned locations
* Never leave children or pets in an unattended vehicle
* Check on elderly or heat sensitive individuals
* Know the signs of heat illness

&&

.SHORT TERM /TUESDAY THROUGH THURSDAY NIGHT/...
As of 300 AM Monday...

Key Point:

* Heat Advisory continues Tuesday through Friday.

An upper-level ridge will shift a bit northward into Virginia
and close to the CWA, which should help suppress shower or storm
activity on Tuesday, though isolated activity can`t be entirely
ruled out for the mountains or up north. Tuesday will feature
fairly high dewpoints, with many locations forecast to be in the
upper 60s to lower 70s. Combined with forecast highs in the
mid-90s, heat index values will likely get into the lower 100s
in many lowland locations, much of the lower elevations are
forecast to hit Heat Advisory criteria.

We are forecasting it to be just about as hot on Wednesday as
on Tuesday, but more dry air is expected to move in aloft. As
some of this mixes down in daytime heating, afternoon surface
dew points likely will get limited to the lower 60s, which will
keep heat index values under 100F. Thus we may not quite hit
Advisory criteria on Wednesday, but it could be close in spots.

&&

.LONG TERM /FRIDAY THROUGH SUNDAY/...
As of 1205 PM Monday...

Ridge of high pressure will continue to remain in control for much
of the week, with above normal temperatures, and occasional showers
and storms during peak heating hours. Although dew points will
generally only be in the 60s during the period, the continuation of
temperatures in the upper 90s to possibly even around 100, may
continue to warrant expansion of the heat advisory in time across
much of the lowland counties this weekend. Ridge finally breaks down
towards the end of the period as low pressure moves east across the
Great Lakes region, sweeping a cold front through the area. Along
with a break in the oppressive heat, showers and storms will become
more numerous during the time.

&&

.AVIATION /16Z MONDAY THROUGH FRIDAY/...
As of 625 AM Monday...

Isolated showers and thunderstorms are possible as a front
lifts to the north this morning. Additional activity is
expected to develop as heat and humidity increase this
afternoon. While VFR should continue for the majority of the
day, brief MVFR/IFR restrictions may occur in showers and
storms. Activity diminishes after sundown, then at least partial
clearing and calm surface flow may allow for patches of valley
fog to form overnight.

Outside of storms, winds remain light with a south to southwest
direction today. Calm to light southerly winds are then expected
tonight.

FORECAST CONFIDENCE AND ALTERNATE SCENARIOS THROUGH 18Z TUESDAY...

FORECAST CONFIDENCE: Medium to high.

ALTERNATE SCENARIOS: Brief sub-VFR could occur in showers or
thunderstorms today and valley fog tonight.


EXPERIMENTAL TABLE OF FLIGHT CATEGORY OBJECTIVELY SHOWS CONSISTENCY
OF WFO FORECAST TO AVAILABLE MODEL INFORMATION:
H = HIGH:   TAF CONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.
M = MEDIUM: TAF HAS VARYING LEVEL OF CONSISTENCY WITH MODELS.
L = LOW:    TAF INCONSISTENT WITH ALL MODELS OR ALL BUT ONE MODEL.

UTC 1HRLY       15   16   17   18   19   20   21   22   23   00   01   02
EDT 1HRLY       11   12   13   14   15   16   17   18   19   20   21   22
CRW CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
HTS CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
BKW CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
EKN CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
PKB CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H
CKB CONSISTENCY  H    H    H    H    H    H    H    H    H    H    H    H

AFTER 18Z TUESDAY...
No widespread IFR conditions are expected at this time.

&&

.RLX WATCHES/WARNINGS/ADVISORIES...
WV...Heat Advisory until 8 PM EDT Friday for WVZ005>011-013>020-
     024>032-039-040.
OH...Heat Advisory until 8 PM EDT Friday for OHZ066-067-075-076-
     083>087.
KY...Heat Advisory until 8 PM EDT Friday for KYZ101>103-105.
VA...None.

&&

$$

SYNOPSIS...JP/SL
NEAR TERM...JP/JLB
SHORT TERM...FK
LONG TERM...SL
AVIATION...JLB