Area Forecast Discussion
Issued by NWS Goodland, KS

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FXUS63 KGLD 242337

Area Forecast Discussion
National Weather Service Goodland KS
537 PM MDT Mon Jul 24 2017

.SHORT TERM...(This evening through Tuesday)
Issued at 257 PM MDT Mon Jul 24 2017

Mid-afternoon visible satellite imagery shows a line of scattered
convection forming along a surface wind shift/convergence zone
stretching from Merriman Nebraska to just west of Sidney to Fort
Morgan Colorado. Guidance suggests activity will remain isolated
this evening with most if not all activity remaining northwest of
the forecast area. Only the HRRR is persistent with recent runs
bringing convection into Yuma county before dissipation this
evening. SPC mesoscale analysis still shows capping in the mixed
layer instability field there. That, coupled with a weak steering
flow from the southwest and forecast little movement of the
convergence line suggests convection may ultimately stay just
northwest of the forecast area which is reflected in current

Tuesday looks hot and dry but heat indices will remain below
advisory levels. High temperatures will range from 95 to 100
degrees.  The upper ridge over the central High Plains will weaken
and flatten out a bit Tuesday into Wednesday as a short wave trough
in mid levels moves out of the Rockies and into the Plains. This
feature will initiate convection along a surface lee trough/dryline
in Colorado Tuesday afternoon which will continue Tuesday night.

.LONG TERM...(Tuesday night through Monday)
Issued at 257 PM MDT Mon Jul 24 2017

Tuesday night: Near zonal upper flow will bring through a shortwave
with a decent vorticity lobe across the Central High Plains Tuesday
evening. Combined with leeside troughing and a surface low, this
will help to bring the area chances of storms and showers through
the overnight. While bulk shear values look modest at best, decent
MUCAPE values and high PWATs will give the CWA a chance of seeing
strong to severe storms and very heavy rainfall. Main threats will
be damaging winds and the potential for flash flooding. Main threat
area looks to be Yuma County in CO and our Nebraska counties where
SPC has highlighted a Marginal Risk.

Wednesday-Thursday: Cold front should push through the area
Wednesday/Wednesday night. Will have a chance for showers and
thunderstorms areawide through early Thursday morning as the front
pushes southward. Could possibly see a strong/severe storm mid-
afternoon on Wednesday where GFS is advertising MUCAPE around 2500
J/kg and 0-6km effective shear near 25kt. Thursday afternoon and
overnight looks dry and cooler with highs mainly in the low to mid
80s and lows in the lower 60s areawide.

Friday-Monday: Upper level ridge amplifies over the Rockies placing
us in strong NW flow aloft. Monsoonal moisture plume builds back
into the area, especially at 700mb level. Will have chance of
showers and thunderstorms each afternoon and evening. Temperatures
will be near normal for the period.


.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 531 PM MDT Mon Jul 24 2017

Vfr conditions are expected through the period. For Kgld, south
winds of near 18 knots with gusts to around 25 knots will decrease
to near 12 knots without gusts in a couple of hours. These winds
will stay steady until late tomorrow morning when they will
increase to near 18 knots with gusts to around 26 knots.
Thunderstorms are expected tomorrow but they will affect the site
until after this period.

For Kmck, south winds near 18 knots with gust to around 24 knots
will decrease to around 10 knots in a couple of hours. Those winds
will continue late tomorrow morning. From 07z tonight 13z tomorrow
morning llws will affect the site. Late in the morning the south
winds will once again increase to near 16 knots to around 24
knots. As with kgld, thunderstorms will affect the site after this




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