814
FXUS65 KRIW 100849
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
249 AM MDT Wed Jul 10 2024

.KEY MESSAGES...

- Dangerous Heat Wave builds across Wyoming through the
  remainder of the week.

- Heat Advisories are in effect for the Bighorn Basin, the Wind
  River Basin, and Natrona and Johnson Counties Thursday through
  Sunday.

- Record breaking heat expected with temperatures 10 to 20
  degrees above normal both during the day and overnight.

&&

.DISCUSSION...
Issued at 222 AM MDT Wed Jul 10 2024

Massive heat ridge builds into Wyoming today, beginning a streak
of 5 straight days where temperatures will run 10 to 20 degrees
above normal. Today will see temperatures will into the 90s for
all lower elevations. This includes areas like Jackson Hole,
the Upper Green River Basin, and Sweetwater County, which don`t
often see prolonged heat episodes.

Models have not changed in the previous couple days, bringing H7
temperatures of 20 to 23 degrees C across the state Thursday
through Sunday. This still translates to low to mid 90s west of
the Divide, and upper 90s and low 100s east of the Divide.
Temperatures overnight will only be below 70 degrees in these
locations for only a few hours, so each day will have a heat
start at temperatures jumping back into the 90s. With these
factors in place, Heat Advisories have been posted for the
Bighorn Basin, the Wind River Basin, and Johnson and Natrona
Counties. If you have any outdoor plans these days, or are
traveling, it is imperative that you prepare for the heat. Drink
plenty of water and take frequent cooling breaks. Check on
those that may not have adequate cooling available.

Longer term models note that the heat ridge shifts east somewhat
early next week, possibly getting flattened by a passing
shortwave. While this would moderate the heat somewhat, the
summer heat will still be in place, so be prepared for an
extended hot period.

&&

.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/...
Issued at 1036 PM MDT Tue Jul 9 2024

VFR conditions will prevail through the TAF period, however
scattered convective showers/isolated thunderstorms will develop
Wednesday afternoon. Cloud bases will be quite high (above 10k ft)
and it will be very dry, so most of the showers will be virga. The
dry nature of the convection will result in strong
downdrafts/outflows, so gusty/erratic wind will occur near
showers/storms. The prevailing wind will generally stay below 10
knots at terminals over the next 24 hours, but the
downdrafts/outflows will result in stronger wind at times Wednesday
afternoon.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for
the latest information on icing and turbulence forecasts.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from noon Thursday to 10 PM MDT Sunday for
WYZ004>006-010-011-017-018-020.

&&

$$

DISCUSSION...Straub
AVIATION...Rowe