Area Forecast Discussion
Issued by NWS Hastings, NE

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FXUS63 KGID 231057
AFDGID

Area Forecast Discussion
National Weather Service Hastings NE
557 AM CDT MON MAY 23 2016

.SHORT TERM...(Today and tonight)
Issued at 442 AM CDT Mon May 23 2016

Upper level flow remains southwest with a trough in the western
United states lobbing pieces of energy into the Plains. At the
surface, a cold front marches east across the CWA with thunderstorm
outflow helping to propagate the front east. Most numerical models
place the front just east of the tri-cities by afternoon. I expect
the current thunderstorms to pass east and eventually wane, but
refire along the stalling front and leftover outflow boundaries this
afternoon as instability increases. This should mainly be east of
the tri-cities in our eastern/southeastern CWA as another
perturbation makes its way into the western High Plains. These
thunderstorms will be largely diurnally driven with potentially
2000+ J/kg CAPE. Forcing is a little dicey. However, I included most
of the CWA with at least slight POPs to account for the potential of
the front and outflow boundaries being perhaps farther west, and
also the potential for some elevated storms toward evening. This
instability would be enough for potentially large hail and damaging
wind along the stalled boundary. This will be more likely to occur
in our east/southeastern CWA.

Went primarily with the previous forecast with minor tweaks to
temperature, dewpoints, and wind.

.LONG TERM...(Tuesday through Sunday)
Issued at 429 AM CDT Mon May 23 2016

The long term continues to indicate an active pattern with chances
for thunderstorms everyday. Currently, the potential for severe
weather exist for several days this week. However, there is still
some uncertainty due to the fact these events could ultimately
change certain mesoscale features which will in turn result in a
constantly evolving process this week. It will be best to
consistently monitor the forecast daily for changes that will be
inevitable.

Troughing will be noted over the western CONUS through the beginning
of the long term, and southwesterly flow aloft will be noted over
the forecast area during which several low-amplitude shortwaves will
eject out over the Central Plains. The pattern will change Friday as
the trough moves over the Central Plains.

Tuesday: A surface low will be noted over western parts of the
central plains, and the track will really help determine our severe
potential. Nevertheless, a boundary will be draped over the
forecast area Tuesday, and ample CAPE will be in place around 4000
to 5000 J/kg as dewpoints reach the mid to upper 60s. The overall
shear will be strong, and the environment will be conducive to
support supercells. Confidence is high for the chance of large hail
(2+ inches in diameter). There is also a chance for tornadoes to
develop as well. These will primarily be the main threats but one
cannot rule out damaging winds later as these storms progress. There
is still some uncertainty in the placement of the front and the
surface low. Nevertheless, I still think the environment will be
favorable for severe weather across the forecast area beginning
Tuesday afternoon, especially near and long the boundary which
should be draped across the forecast area Tuesday afternoon.

Wednesday and Thursday: Both of these days have the potential for
severe weather across the forecast area. Again, ample CAPE will be
in place both days. The overall environmental shear is stronger
Thursday, but both days could potentially support supercells.

Thunderstorms are possible later in the week as well. Confidence for
severe potential dwindles beyond Thursday. Temperatures will be
above normal throughout he long term.

&&

.AVIATION...(For the 12Z KGRI/KEAR TAFS through 12Z Tuesday morning)
Issued at 552 AM CDT Mon May 23 2016

Ceilings continue to be low confidence. Models have not handled
ceilings well for days. Most thunderstorms will fire east of the
terminals along a stalling front/outflow boundaries this
afternoon, but there is still an outside chance of a stray
thunderstorms, especially at KGRI. Wind direction this morning is
also low confidence as wind direction may be temporarily from the
north due to the recent passage of the outflow, may become
variable or south as the front/outflow boundary stalls.

&&

.GID Watches/Warnings/Advisories...
NE...None.
KS...None.
&&

$$

SHORT TERM...Heinlein
LONG TERM...Guerrero
AVIATION...Heinlein



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