Severe Thunderstorm Warning 19, NWS Houston/Galveston, TX

Area Forecast Discussion
National Weather Service Houston/Galveston TX
635 PM CDT Mon Mar 14 2022

.AVIATION...

SHRA/TSRA are developing ahead of tonight's cold front with CLL and
UTS at most risk early this evening. As the evening progresses, look
for activity to continue to develop along and ahead of the front with
a SHRA/TSRA risk for the remaining TAF sites. Generally expecting MVFR
ceilings to develop this evening with the potential for IFR/LIFR
ceilings/visibilities associated with the stronger SHRA/TSRA. Rapid
clearing can be expected behind the front with strengthening NW winds
developing during the day tomorrow. 42

&&

.PREV DISCUSSION... /ISSUED 405 PM CDT Mon Mar 14 2022/

SHORT TERM [Through Tuesday Night]...

WAA associated with persistent onshore flow and south/southwest
winds aloft have allowed for temperatures today to outperform most
deterministic models, with some locations breaking the 80 degree mark
as of 3 PM this afternoon. Diurnal heating and increased moisture
associated with this flow pattern has also allowed for a widespread
cumulus field to develop ahead of the approach of an approaching
surface cold front, which will move into SE TX this evening.

Environmental conditions ahead of the approaching cold front
continue to support the development of some strong to severe storms
this evening through the early hours of Tuesday morning,
particularly in locations to the north of the Houston metro area
given the favorable positioning of the mid/upper level trough axis
to our west. Latest SPC mesoanalysis/model soundings indicate
widespread 0-6km shear values in excess of 60kts, upstream SBCAPE
values in excess of 1000 J/kg, midlevel lapse rates of around 7
degC, and low-level helicity on the order of 200 m^2/s^2 as
convection initiates over the next few hours. Given the favorable
parameter space for some severe convective development, a Severe
Thunderstorm Watch has been issued through 9 PM for portions of our
northern counties. This watch may be expanded to include additional
portions of SE TX as the event evolves tonight. Primarily, we
anticipate this mainly being a hail threat, though favorable low-
level shear also points to the possibility of isolated tornadoes.
Make sure you stay up to date with the latest forecast information
this evening, and have multiple ways to receive weather related
warnings!

Initial development of discrete cells ahead of an approaching cold
front will begin over the next few hours across the northern zones,
where the hail and tornado threat will be greatest in any stronger
storms that develop. As the front moves into SE TX, convection will
eventually become linear and quickly push through the area. Boundary
timing has sped up by a few hours compared to the previous package
given trends in hires guidance and enhanced diurnal heating thus far
this afternoon, with passage expected in the Brazos Valley around 8-
9 PM, the Houston metro around 10-11 PM, and the coast just after
midnight. Localized heavy downpours will be possible as the boundary
pushes through, though a flooding threat is not anticipated.

Behind the departing front, moderate north winds will develop and
bring a quick surge of drier air to the area. As a result, generally
clear but gusty conditions are expected on Tuesday, though some
locations northeast of the Houston metro may experience some
lingering cloud cover as wraparound moisture associated with the
departing surface low moves into the area. This will produce highs
in the 60s in these locations, where otherwise highs will reach the
low-mid 70s. Overnight lows will dip into the 40s/lower 50s with
mostly clear conditions expected to continue.

Cady

LONG TERM [Wednesday Through Monday]...

A transient high pressure will be sliding across Texas on Wednesday
providing the region with mostly sunny skies, high temperatures in
the mid to upper 70s, and light southeasterly winds. But this high
pressure will not be sticking around long as it will shift to the
central Gulf by Wednesday night increasing moist, southerly flow
into our region. Overnight low temperatures Wednesday night will be
in the low to mid 50s for most of the region while the coast remain
near 60. An upper level low will be moving into the Central Plains
Thursday morning developing a surface low in North Texas/Oklahoma
Thursday. Between the high pressure to the east and this developing
low pressure system to the northwest, the pressure gradient across
SE Texas will tighten helping to funnel very moist, warm air into
the region. PWATs climb from around 0.5" on Wednesday to around 1-
1.2" on Thursday. Expect increasing cloud cover and maybe some
streamer showers on Thursday afternoon as a result. Temperatures
Thursday afternoon climb into the upper 70s for most of the area to
even the low 80s across the B/CS area thanks to more sun getting
able to peak out over there. The cold front associated with the
system to the northwest will pass through our region late Thursday
bringing a line of showers and thunderstorms, however the best
dynamics for strong thunderstorms or heavy rain will remain north
and east of our region. It will usher in drier, cooler air for
Friday with highs in the low to mid 70s.

High pressure will be building over east Texas Friday night
providing dry air and light winds, so great conditions for
radiational cooling. Lows Friday night will dip into the 40s north
of I-10 with low 50s elsewhere. Unlike the high pressure that starts
the long term, this high pressure will not exit quite as quickly
providing us great weather this Saturday with clear skies afternoon
temperatures in low 70s. Conditions begin to change on Sunday as the
high pressure slides eastward and the southerly, moist onshore flow
resumes. High temperatures climb into the upper 70s on Sunday then
near 80 by Monday.

We will be monitoring a strong upper level low that moves down from
the Pacific Northwest on Sunday that moves into the Central Plains
Monday and Tuesday of next week. There is still a lot of the finer
details that need to be worked out with this system, but we could
start to see some precipitation as early as Monday morning as WAA
and PVA increases across the region.

Fowler

MARINE...

Persistent onshore flow has increased the risk of strong rip
currents this evening along Gulf facing beaches, so a Rip Current
Statement has been issued through tomorrow morning. A cold front
will be moving through the waters just after midnight tonight
bringing a line of strong thunderstorms. These thunderstorms will be
capable of producing frequently lightning, large hail, and locally
high wind gusts and seas. Moderate to strong northwesterly flow will
develop behind the front producing seas 4 to 6 feet, so caution
flags or small craft advisories may be necessary Tuesday morning
through Tuesday evening. High pressure on Wednesday will result in
light winds and low seas, then onshore flow returns on Thursday
ahead of the next front. This front will push through the coastal
waters late Thursday night into Friday morning with moderate
offshore flow develop for Friday. Quiet weather returns for the
weekend with the next system midweek next week.

Fowler

&&

.PRELIMINARY POINT TEMPS/POPS...
College Station (CLL)      47  71  46  77  51 /  60   0   0   0   0
Houston (IAH)              53  72  49  76  52 /  90   0   0   0   0
Galveston (GLS)            59  70  55  69  59 /  80   0   0   0   0

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TX...High Rip Current Risk through Tuesday morning for the following
     zones: Bolivar Peninsula...Brazoria Islands...Galveston
     Island...Matagorda Islands.

GM...NONE.
&&

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>