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Next 12 Hours

Forecast data from the National Digital Forecast Database.

5 Day Forecast

• Tuesday
• 
• High: 84 °
• Low: 73 °
• Chance of a Thunderstorm

• Wednesday
• 
• High: 86 °
• Low: 72 °
• Chance of T-Storms

• Thursday
• 
• High: 84 °
• Low: 72 °
• Partly Cloudy

• Friday
• 
• High: 86 °
• Low: 72 °
• Partly Cloudy

• Saturday
• 
• High: 86 °
• Low: 68 °
• Partly Cloudy

Area forecast discussion 
National Weather Service Houston/Galveston Texas 
355 am CDT Tuesday may 21 2013 


Discussion... 
warm and humid early morning across the region the continued 
southerly flow. Upper trough over the Great Plains and extending 
down toward El Paso this morning. Very strong cap in place this 
morning with a few bits of light rain and drizzle showing up on 
radar and out the window...mainly over the southern areas. The 
upper trough will slowly shift east with short wave over Arizona/nm this 
morning tracking east through the afternoon then east-northeast. This feature 
should combine with the strong middle/upper level flow to 
dramatically increase lift after 3 PM and around the cll-dkr areas 
peaking after 7 PM. Model soundings are favorable for strong to 
severe thunderstorms. Frontal boundary pushes east with rain 
cooled air and expecting showers and thunderstorms to expand 
rapidly in coverage building south into Austin area then moving 
eastward. Very unstable 3000-4000 j/kg atmosphere to west of the 
southeast Texas will be the initiation zone but should be reaching the cll 
area around 6 PM with instability decreasing. Expect severe threat 
of mainly hail and damaging winds between around 5 PM through 
midnight for the northern areas with the arrival of short wave and the 
associated cold front. Tornado threat looks low but can't rule out 
short lived spin ups but will probably be confined to areas north 
of Brenham to Groveton line (greatest ehi 2.0+ from Madisonville 
to Crockett but out ahead of cap eroding). Do have some concerns 
with the strong cooling aloft that the severe threat could need 
extending beyond 06z and expanding to the coastal areas. Texas 
tech WRF and some of the high res arw/nmm models indicating 
possibly squall line/Bow developing and moving through Houston and 
to Galveston between midnight and 2 am. Diminishing instability 
and return of cap should limit that outcome. So as for the 
forecast have raised rain chances for areas generally north of 
I-10 this afternoon and overnight. Boundary pushes to near the 
coast and slows and will raise the rain chances for Wednesday in 
the south with the cap eroding in the afternoon and cape of 
1800-2500 returning and slow/erratic storm motions...may have some 
brief heavy downpours given the light steering winds and counter 
to sea breeze flow aloft. 


Upper ridge expands up out of Mexico Thursday through Sunday with 
the 500 ridge centered over southeast Texas Saturday an Sunday. This should 
lead to warmer temperatures returning and have gone above guidance 
for the afternoon Friday-sun timeframe temperatures. Rain chances 
fall off and moist southeast flow resumes. Also of interest looks 
to be a tropical wave moving out of the Caribbean and possibly 
impacting southeast Texas and western Gulf Monday and Tuesday next week. 


On a technical note...surface observation and lightning data 
outage 04-07z appears to be corrected. 


&& 


Marine... 
moderate to occasionally strong onshore winds will persist into this 
evening before beginning to diminish Wednesday and Thursday. Light 
to moderate onshore winds will prevail through next weekend as 
surface high pressure ridges into the northern Gulf Coast. Will 
maintain an scec for today for the Gulf waters. Tide levels will 
remain slightly elevated today and return to normal levels 
Wednesday. 43 


&& 


Preliminary point temps/pops... 
College Station (cll) 91 73 89 72 91 / 30 40 20 10 10 
Houston (iah) 91 73 88 72 90 / 20 50 30 10 20 
Galveston (gls) 80 75 81 75 81 / 10 30 30 10 20 


&& 


Hgx watches/warnings/advisories... 
Texas...none. 
GM...small craft should exercise caution through this afternoon for 
the following zones: waters from Freeport to the Matagorda 
Ship Channel 20 nm to 60 nm...waters from Freeport to the 
Matagorda Ship Channel out 20 nm...waters from High Island 
to Freeport 20 to 60 nm. 


&& 


$$ 


Discussion...45