Area Forecast Discussion
Issued by NWS Houston/Galveston, TX

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FXUS64 KHGX 211548

Area Forecast Discussion
National Weather Service Houston/Galveston TX
1048 AM CDT Fri Jul 21 2017

A weak low pressure trough was along the coast at the surface at
mid morning. Isolated to scattered showers were developing to the
south of the boundary. Outflows from these storms were pushing
toward the coast and helping showers to form over the coastline.
Expect these to continue moving inland as the outflows combine
with the seabreeze.



.PREV DISCUSSION... /ISSUED 654 AM CDT Fri Jul 21 2017/

Today`s conditions will likely unfold much like previous days`
early day growing cumulus deck and near calm breezes. Per a more
unsettled maritime environment...possible morning showers/isolated
embedded storm may impact the (near) coastal terminals. As surface
temperatures reach the middle 90s at around 2000 or 2100 Z expect
discrete interior towering cumulus to further development into
thunderheads. Convective (areal) coverage will probably be no more
than 20 or 30 percent but those hubs that do experience a thunderstorm
can expect to have less than a half an hour of intense visby-restricting
rainfall and gusty winds. 31

PREV DISCUSSION... /ISSUED 525 AM CDT Fri Jul 21 2017/

Early morning temperatures (4 AM) range from the mid to upper 70s inland
to the lower 80s at the coast. Look for another warm July day with high
temperatures around 90 at the coast and in the mid/upper 90s inland
with heat index values generally in a 102-107 range. The area remains
on the southern fringes of mid/upper level ridging, and water vapor
satellite images show a westward moving mid/upper level Florida panhandle
low that will bring our area its next best chance of storms. Before
this feature`s influence arrives over the weekend, look for one more
day with isolated to widely scattered showers and thunderstorms - near
the coast in the morning and developing inland as the day progresses.
Rising rain chances can be expected over the weekend as moisture and
instability increases with the arrival of the mid/upper level low.
Slightly lower afternoon high temperatures are anticipated over the
weekend due to the increasing clouds and rain chances. Ridging tries
to build back across the area next week, and this should help to lower
rain chances and raise temperatures similar to what we have seen over
the last couple of days.  42

Weak disturbances...along with the weekend visit of a weak low
currently rotating west out of Florida...will introduce periodic
showers and thunderstorms. Early day light southwesterlies will back
more southerly through the day. A tighter onshore gradient early
next week will strengthen overnight winds to near Caution levels.
Wave heights will pick up from their current 1 to 2 foot heights to
nearshore 2 feet to 4 feet offshore average heights by Monday. 31

Houston/Hobby Airport set a new record high minimum temperature yesterday
when the low only got down to 80 degrees (old record was 79 degrees
set in 1980). Earlier this month, Hobby tied two record high minimum
temperatures (80 degrees on the 13th and 79 degrees on the 14th). 42


College Station (CLL)      97  76  95  77  96 /  10  10  30  20  30
Houston (IAH)              96  78  92  79  93 /  20  20  50  30  50
Galveston (GLS)            91  83  88  83  89 /  20  20  50  30  50




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