Area forecast discussion
National Weather Service Charleston WV
935 PM EDT Wednesday may 22 2013
Synopsis...
a cold front crosses late tonight...followed by another late
Thursday. Upper low crosses early Friday...followed by high
pressure...with cooler and drier air...for the weekend.
&&
Near term /through Thursday/...
930 PM discussion...have cancelled the Severe Thunderstorm Watch in
time for evening news...which expires at 10 PM anyway. While line of
convection will be crossing our area overnight...expect with loss of
heating that they should remain below severe limits. Storm Prediction Center does not
anticipate new watch. Otherwise...continue high probability of precipitation from west to
east with this line...although weakening is expected after midnight.
&&
Short term /Thursday night through Saturday/...
unsettled weather slowly diminishes Thursday and Friday...as upper
trough...and associated cold front sweeps across the region. This
will keep a chance for showers and thunderstorms in the forecast for
the start of the short term period. The storms may contain some
stronger wind gusts as there will still be moderate winds aloft. No
severe weather is expected Thursday and Friday at this time.
A drier...and cooler air under northwesterly flow...will take hold
for Friday through Saturday as the upper trough pushes east. Colder
night seems to be Friday night...generally in the lower 40s
lowlands...ranging to the middle 30s higher elevations...particularly
Saturday morning...enhanced by radiational cooling per good
clearing...and light surface winds
High pressure builds from the north Friday into the weekend. Some
fog development possible early Saturday morning.
&&
Long term /Saturday night through Wednesday/...
have generally followed wpc thinking for this portion of the
forecast.
High pressure will be in control of the weather across the area into
Sunday night. However...models suggest a few weak middle-level
shortwave may move southeast. Believe area should remain dry...with
a few more clouds beginning Saturday night
A warm front will then develop and approach the region on Monday. As
a result...there will be a chance of showers and storms Monday and
Tuesday...mainly during the afternoon and evening hours.
Temperatures on Saturday should be near normal with daytime highs in
the 70s across The Lowlands...with 60s across the higher
elevations. As the high pushes east on Sunday...expect temperatures
to warm to slightly above normal values Monday and Tuesday.
&&
Aviation /02z Thursday through Monday/...
02z Thursday through 00z Friday...
will be following a band of convection with an upper disturbance
rolling across the area tonight from west to east. Ahead of this
band will be VFR conditions. With and behind the band will be MVFR
conditions...first with the convection including some thunder...then
cold pool stratus and fog. By 13z becoming VFR ceilings as southwest
winds pick up. Some afternoon redevelopment of scattered convection
expected with another upper disturbance and reinforcing cold front.
Forecast confidence and alternate scenarios through 00z Friday...
Forecast confidence...medium.
Alternate scenarios: timing and degree of flight restrictions due to
convection tonight could vary...as well as timing and extent of
stratus and fog tonight.
Experimental table of flight category objectively shows consistency
of weather forecast office 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.
Date Thursday 05/23/13
UTC 1hrly 02 03 04 05 06 07 08 09 10 11 12 13
EDT 1hrly 22 23 00 01 02 03 04 05 06 07 08 09
crw consistency h h h h M M M M M M h h
heights consistency h h h h h h M M M h h h
bkw consistency h h M M M M M M h h h h
ekn consistency h M M M M M h h h h h h
pkb consistency h h h h h h M M h h h h
ckb consistency h h h M M M M h h h h h
After 00z Friday...
IFR conditions possible in early Saturday morning.
&&
Rlx watches/warnings/advisories...
WV...none.
Ohio...none.
Kentucky...none.
Virginia...none.
&&
$$
Synopsis...arj/30
near term...jmv/30
short term...arj
long term...arj
aviation...jmv
