textproduct: Norman

KEY MESSAGES

Updated at 141 AM CDT Sun Jun 28 2026

- Heat Advisory in effect this afternoon and evening for northwest and north-central Oklahoma

- Low chances of thunderstorms across far western Oklahoma during the evening hours through mid-week

- Near-record warm low temperatures possible for many locations this week

NEAR TERM

(Through Sunday) Issued at 141 AM CDT Sun Jun 28 2026

Morning low temperatures are expected to remain anomalously warm with near record warm low temperatures possible at a few locations, including OKC. Record warm low for June 28th at OKC is 78 deg, which was set in 1986...and this will set the tone for the rest of the day.

The upper air pattern is depicted by a broad trough over the western third of the CONUS and a ridge centered near the lower Mississippi River Valley. This will provide for breezy return flow and dewpoint temperatures will remain in the low 70's (partially aided by evapotranspiration from recent heavy rains). H850 temperatures will be slightly higher today as the LLTR shifts farther east across the panhandles, and result in hotter temperatures than yesterday. The resulting heat index values are forecast to rise above 105 degrees over north-central to northwest Oklahoma by early afternoon and a Heat Advisory has been issued for this area. Fortunately, heat stress will be mitigated to an extent by southerly winds at 20 mph with gusts to 35 mph possible.

The dryline will inch closer to the 100th meridian compared to yesterday and thunderstorm development is possible near this feature by late afternoon and evening. POPs remain very low at less than 10 percent over far western Oklahoma and the marginal risk of severe storms remains west of our FA.

Thompson

SHORT TERM

(Sunday night through Tuesday night) Issued at 141 AM CDT Sun Jun 28 2026

The center of the aforementioned trough lifts northeastward and the LLTR weakens slightly. Air temperatures and heat index values will be a bit lower in the short term compared to today with breezy southerly winds continuing. Thunderstorm chances will rise to 20% percent for western Oklahoma on Monday and Tuesday evenings, with greater chances remaining over the Texas panhandle and west Texas.

Overnight low temperatures will remain in near-record warm low territory in the short term. Record warm low temperatures to beat:

June 29 June 30 July 1

Oklahoma City: 78 (1998) 80 (1980) 76 (1993) Lawton: 79 (2024) 81 (2024) 76 (1999) Wichita Falls: 81 (2011) 81 (1980) 83 (1980)

Thompson

LONG TERM

(Wednesday through Saturday) Issued at 141 AM CDT Sun Jun 28 2026

The heat continues with very low rain chances. High temperatures and heat index values are forecast to gradually increase towards end of next week and into next weekend with heat index values of at least 105 degrees forecast to return to a few locations on Thursday and becoming more widespread by Saturday. The GFS & European models indicate isolated showers and thunderstorms by evening of July 4th for parts of northwest/western Oklahoma, but the ensemble blend keep chances very low for now.

Thompson

AVIATION

(00Z TAFS) Issued at 933 PM CDT Sat Jun 27 2026

VFR conditions to continue.

Few high clouds overnight with gusty south winds. Even with gusty winds a llj will result in llws at most sites through 13-14Z. Gusty south winds continue through the day Sunday with some increasing high clouds. Will also include llws toward the end of the forecast for most sites as llj ramps back up Sunday evening.

PRELIMINARY POINT TEMPS/POPS

Oklahoma City OK 96 78 96 78 / 0 0 0 0 Hobart OK 100 78 100 78 / 0 0 0 10 Wichita Falls TX 100 77 99 76 / 0 0 0 0 Gage OK 101 80 100 79 / 0 10 10 20 Ponca City OK 94 79 94 79 / 0 0 0 0 Durant OK 95 78 96 77 / 0 0 0 0

OUN WATCHES/WARNINGS/ADVISORIES

OK...Heat Advisory from 1 PM this afternoon to 8 PM CDT this evening for OKZ005>008-010>013-017>020.

TX...None.