River Flood Warning 137, NWS Fort Worth, TX

Area Forecast Discussion...UPDATED
National Weather Service Fort Worth TX
1203 AM CDT WED JUN 1 2016

.AVIATION...
/06Z TAFs/

Some rain continues near KACT at this hour but is expected to
dissipate by 07Z. MVFR and IFR cigs are expected to return across
the TAF sites overnight with conditions improving to VFR Wednesday
afternoon. Cool east to east-southeast winds will continue through
the valid TAF period, but wind shifts are possible due to outflow
winds near showers/storms. Overnight, there is good consensus
that isolated to scattered convection will develop again and
affect the DFW area and possibly around KACT. Will keep thunder
mentioned at the DFW TAF sites from 09-15Z but mention VCSH at
KACT from 11-15Z based on the latest guidance. Scattered showers
and storms are expected to return Wednesday afternoon and could
persist through the evening hours and into the overnight hours
with periodic breaks in the convective activity.

JLDunn

&&

.UPDATE...
The first wave of rain and thunderstorms will continue to affect
the eastern counties of the forecast area through late evening but
will move into East Texas overnight. Most of North and Central
Texas should see a break in the precipitation through the
overnight hours. However, the next round of precipitation
associated with the approaching upper low is already organizing
across the South Plains and Permian basin. This activity should
begin to affect the western sections of North Texas just before
sunrise Wednesday. The atmosphere across North Texas is very moist
as observed in the the 00z FWD sounding. Therefore, the threat
for heavy rainfall will continue through Thursday. The eastern
counties of the forecast area may need to be added to the flash
flood watch but will wait for the 00z model data to fully assess
where the most favored areas for heavy rainfall will be.

No major changes are needed to the forecast but will adjust
temps/dewpoints and winds based on surface analysis and current
trends.

79

&&

.PREV DISCUSSION... /ISSUED 356 PM CDT TUE MAY 31 2016/
Numerous showers and thunderstorms are ongoing across North and
Central Texas this afternoon. This is the first of what will
likely be multiple rounds of showers and thunderstorms over the
next 72 hours. At the surface...a remnant outflow boundary slid
southward into the region earlier today and helped focus initial
thunderstorm development beneath an increasingly favorable pattern
aloft. Since these storms have developed...several smaller outflow
boundaries have been produced and lie scattered across North
Texas. The pattern aloft features a slow moving upper trough over
the southwest U.S. in which several smaller disturbances are
rotating around and into the Southern Plains. These smaller
disturbances are providing periods of enhanced large scale forcing
for ascent within an increasingly moist buoyant atmosphere.

In the immediate short term...think showers and thunderstorms will
continue to slowly move east through the evening hours. The air to
the east of I-35 is a little more unstable with some drier air
aloft which may help to enhance downdrafts within the convection.
While this may serve to locally enhance the severe threat with the
strongest storms...it should also help the entire area of
precipitation move eastward through late tonight. That being
said...increasing southerly low level flow will also serve to keep
a steady fetch of rich Gulf of Mexico moisture streaming
northward. High PoPs will continue through tonight...although we
may see a brief decrease in the activity the later we get into
the nighttime hours and early Wednesday morning.

On Wednesday...with persistent deep southerly flow...the
atmosphere across the region will become more tropical-like with
PW values increasing to around 1.8 inches. Soundings across the
area will feature tall-skinny CAPE with generally weak wind
profiles. In addition...flow at 250mb becomes increasingly
diffluent. This should allow for convection with increased
precipitation efficiency and very heavy rainfall rates. Coverage
of showers and thunderstorms tomorrow is expected to be high
although pinning down the locations of heaviest rainfall will be
tough. An expansion and extension of the flash flood watch will
likely need to be considered during this time. The severe weather
threat on Wednesday will generally be low...although the strongest
cells could produce some locally strong winds owing to
precipitation loading.

The nearly vertically stacked upper low will get closer to the
area Wednesday night into Thursday which will keep North and
Central Texas within the persistent region of forcing for ascent.
Continued redevelopment of showers and thunderstorms is expected
during this time. Given the unidirectional wind profile within a
saturated column...bands of training echoes are expected somewhere
across North and Central Texas. These bands will produce very
intense rainfall. High PoPs will continue across the entire area
through Thursday...although it will not rain continuously during
this time.

As the upper low begins to slowly drift to the south on Friday and
Saturday...rain chances will begin to diminish from north to
south. A very quick glance at some longer range guidance suggests
that after this week we may get into a period of drier weather.

Dunn

&&

.PRELIMINARY POINT TEMPS/POPS...
Dallas-Ft. Worth    69  79  67  79  67 /  80  80  60  70  60
Waco                68  79  67  78  65 /  80  80  80  70  60
Paris               67  79  67  80  66 /  70  70  60  70  50
Denton              67  77  65  78  65 /  80  80  60  70  50
McKinney            67  79  66  78  65 /  80  80  60  70  60
Dallas              70  79  67  78  68 /  80  80  70  70  60
Terrell             68  80  67  79  66 /  70  80  70  70  60
Corsicana           69  80  68  78  67 /  60  80  70  70  60
Temple              68  80  67  78  65 /  80  80  80  70  60
Mineral Wells       67  77  65  77  64 /  80  80  60  70  50

&&

.FWD Watches/Warnings/Advisories...
Flash Flood Watch through Thursday morning for TXZ091>093-
100>104-115>120-129>134-141>145-156>160-174.

&&

82/79

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