Area forecast discussion
National Weather Service Midland/Odessa Texas
642 PM CDT Wednesday may 22 2013
Discussion...
see aviation discussion below.
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Aviation...
low level jet will help to keep winds up overnight at most sites. Low
level moisture will return overnight also but Haven/T seen any indications
of low clouds. Satellite does show high clouds increasing from the
west and bkn200-250 will prevail tonight. The chance of rain showers/thunderstorms and rain will
increase after 18z Thursday. For now have opted leave prob30 groups out
but they will probably begin to appear in tafs in the 06z and 12z
issuances.
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Previous discussion... /issued 237 PM CDT Wednesday may 22 2013/
Discussion...
zonal flow will inhibit convection today...but an amplifying ridge
over the Central Plains will cause flow to back from the southwest
in the Lee of The Rockies allowing showers and thunderstorms to
form Thursday and continue into the weekend. The backing flow will
cause low level moisture to surge westward increasing instability
across the County Warning Area however with no surface boundary to focus
on...thunderstorms will be widely scattered with daytime heating
and weak upper disturbances being the main triggers. The one
factor that is impossible to forecast for will be outflow
boundaries which could provide weak low level convergence. One
such feature may push south tomorrow evening as convection fires
in the Texas Panhandle along a stationary front. As mentioned by
the middle shift...precipitable water values will increase from one
half inch currently to well over an inch tomorrow and Friday
meaning there will be enough moisture present for heavy rain. The
threat for very localized flooding will be present especially in
urban areas where drainage is poor. The overall severe weather
threat however will be low as 0-6km shear values just are not
quite high enough.
The increase in precipitation and clouds will bring high temperatures back down
below climatology and make for a pleasant next few days. Middle level winds
become slightly more westerly by Sunday so decided to end probability of precipitation at
that time though the general West Coast trough/Central Plains
ridge regime will continue so cannot rule out rain chances into
next week. In fact several models do show rain next week but will
not introduce probability of precipitation that far out given how dry we have been
recently.
Hennig
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Maf watches/warnings/advisories...
nm...none.
Texas...none.
&&
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