textproduct: Cheyenne

KEY MESSAGES

- Red Flag Warning is in effect from 11 AM Saturday through 9 PM Sunday for all of southeast Wyoming for very low humidities and significant gusty winds.

- Hot temperatures continue through the start of the week before a pattern change begins to occur as precipitation chances start to rise and temperatures fall, dropping to below normal by the later half of the week.

SHORT TERM /THROUGH SUNDAY NIGHT/

Issued at 256 PM MDT Sat Aug 8 2026

The upper level ridge starts to weaken and flatten this weekend. This will allow a few shortwaves to push across the area for potential showers. However, models soundings are the high based inverted V today and sunday. So for today no qpf was added to the forecast since it will be so dry at the surface that if it did "rain", the precip will likely evaporate and produce gusty showers. There is a little more forcing with respect to the available vorticity increasing synoptic ascent with the wave on Sunday. So a whole hundredth of qpf was inserted in the grids for the chance of something making it to the ground but also don't hold your breath for measurable precip this weekend. The pressure/height gradient also gets slightly tightened at the 700mb with each upcoming wave. For today, the "ridge arc" has the apex occur over the western portion of Wyoming/upper Utah/lower Idaho area and arcs downward to put us near a West/northwest flow over our southeast wyoming area. Wind gusts may reach around 35 mph this afternoon and potentially around 55 to 60mph underneath these afternoon/evening showers. The Nebraska Panhandle will see the fairly usual 20 mph winds today but could see those 30 mph winds tomorrow as the ridge really flattens out over our area. Otherwise we will continue our warm temperature trend this weekend as the 700mb temperatures stay between 15 to 18C. So high temperatures will stay in the 90's with some areas in our northern counties exceeding 100 degrees today and get near 100 on Sunday.

LONG TERM /MONDAY THROUGH SATURDAY/

Issued at 256 PM MDT Sat Aug 8 2026

This long-term forecast period will continue a suppressed ridge pattern. The 500mb jet keeps stationed over the PNW and into the Rockies and high plains areas of Montana through northern Wyoming. Precipitation chances increase as the week goes on, with PWAT values increasing daily. Wednesday through Friday looks to be the best chances of precipitation. Severe weather does not appear to be a threat at this time in southeast Wyoming due to mostly light westerly flow in the mid and upper levels. Nebraska on the other hand has better chances of severe weather. As the ridge pushes south and suppresses, faster flow aloft moves in. Wind shear values look to be around 30-40 knots which have the potential to produce multicellular storms. Warm conditions continue through most of this long-term period, but with those precipitation chances mid - end week, temperatures likely will likely be lower than earlier in the week. 700mb temperatures show ranges from the teens to mid-teens, supporting a cooler end of the week. Fire weather will continue to be a concern through Monday with low RHs and some gusty winds. With precipitable water, RHs, RH recoveries, and precipitation chances increasing throughout the week, fire weather concerns fade away.

AVIATION /18Z TAFS THROUGH 18Z SUNDAY/

Issued at 1123 AM MDT Sat Aug 8 2026

The low clouds across the Nebraska panhandle have moved out from all terminals except AIA with a few scattered clouds leftover. Clouds across the region are expected to stay fairly sparse through this TAF period. Strong W to NW winds across the WY terminals are expected through early this evening with gusts around 20-30 knots. Winds shifts are expected over the NE terminals with gusts up to 20 knots. There is a low chance for a high based shower/storm for the WY terminals, but it is too low of a probability to put into the TAFs. VFR expected through this TAF period.

CYS WATCHES/WARNINGS/ADVISORIES

WY...Air Quality Alert until noon MDT Monday for WYZ101>119. Red Flag Warning until 9 PM MDT Sunday for WYZ417>433. NE...None.