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Area Forecast Discussion
Issued by NWS Amarillo, TX
Issued by NWS Amarillo, TX
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288 FXUS64 KAMA 261146 AFDAMA Area Forecast Discussion National Weather Service Amarillo TX 646 AM CDT Wed Jun 26 2024 ...New AVIATION... .SHORT TERM ... (Today through Tonight) Issued at 420 AM CDT Wed Jun 26 2024 The center of the upper level ridge remains fixed in the desert southwest CONUS for today. A northwest flow regime shall continue to allow boundaries to exit off the lee side of the Rocky Mountains and create additional thunderstorm chances for the Panhandles this evening. All the while, high temperatures at the surface prolong in the low to mid 100`s. With regards to today`s heat, short term guidance suggest 850mb temperatures generally exceed 33 degrees Celsius during the peak heating hours of the today. This will allow for temperatures at the surface to easily surpass 100 degrees Fahrenheit and in some areas even 105 degrees. A Heat Advisory is currently in effect for those areas that should see temperatures and heat index values exceed 105 degrees. This is mainly for the Palo Duro Canyon and the southeastern Texas Panhandle. Cloud coverage should not hinder the surface from heating up through the day. Only by the late afternoon hours will clouds have any affect on day time temperatures, as thunderstorms are not expected before then. Sufficient instability and moisture will be present once again to allow thunderstorms to form in the afternoon hours today. Weak forcing from perturbations entering off the high terrain in our northwest zones will allow for scattered thunderstorm development, mainly focused for the western half of our CWA. Depending on how high our CAPE values can become, some storms may become severe with damaging winds as the primary threat. 0-6 km bulk shear between 30-40 kts will create good sustain for any robust storm, the main question is how many, if any, can get there. CAMs and other short range models give a bit of variety when producing maximum suggested MUCAPE values for today, typically ranging from 500-3,000 J/kg. Though most guidance agrees that the highest values will likely be placed in the Oklahoma Panhandle and the northern Texas Panhandle. Overall, destabilization will be adequate at least for general thunderstorms with some becoming strong to severe. Once thunderstorms begin in the afternoon, additional convective activity should extend into the night time hours. Outflow and cold pools from prior thunderstorms will spark new generation and keep the event ongoing perhaps even beyond midnight and into early Thursday morning. Rangel && .LONG TERM... (Thursday through Tuesday) Issued at 420 AM CDT Wed Jun 26 2024 For Thursday and Thursday night, the upper level ridge of high pressure is forecast to temporarily flatten somewhat and be depressed southward. This will result in the upper level flow becoming more semi-zonal or westerly. This would steer any showers and thunderstorms that develop more eastward across the Oklahoma Panhandle and far northern Texas Panhandle if the latest short range models verify. Pops were fashioned in that manner in the grids. Much like the past couple days, a few storms that develop will have the potential to become strong to severe, with damaging winds and large hail the primary hazards. High temperatures or Heat Index values may once again approach or exceed 105 degrees across the Palo Duro Canyon State Park and perhaps the far southeastern counties such as Collingsworth. Another Heat Advisory may be needed for that area for Thursday afternoon into early evening. Otherwise, little change was made to the long term periods Friday through Tuesday. The upper level ridge of high pressure will continue to be the overall dominant feature in our weather pattern through Tuesday and beyond. A weak cold front may move across the region late Friday night into Saturday and could temporarily bring slightly cooler temperatures for this weekend before increasing again early next week. Given the strength of this ridge, high temperatures across many locations will likely approach or exceed 100 degrees on Friday, Monday, and Tuesday. Heat Index values may approach or exceed 105 degrees at times on one or more of the aforementioned days, and additional Heat Advisories may be needed. As has been the case the past several days, precipitation chances from Friday through Sunday evening will strongly depend on the strength of the upper level high pressure, its axis location and resultant steering flow for storms, and how long our forecast area sits beneath it. Nearly all medium range models continue to suggest periodic meandering of the ridge axis from west to east during the extended periods. The latest NBM pops and temperatures reflect the overall synoptic pattern and were accepted with no major adjustments necessary for this package. 02 && .AVIATION... (12Z TAFS) Issued at 640 AM CDT Wed Jun 26 2024 Thunderstorm mentions have been added to GUY alongside DHT for the increased confidence in coverage this evening. Lower chances are in place for AMA through the 12Z TAF period, so mentions have been left out for now. Otherwise, VFR conditions will prevail at all sites outside of the window for thunderstorms. Breezy southeasterly winds will start this afternoon at all sites and last until the evening. Rangel && .PRELIMINARY POINT TEMPS/POPS... Amarillo TX 102 73 99 76 / 10 30 10 10 Beaver OK 99 70 100 76 / 10 20 10 20 Boise City OK 99 67 96 69 / 30 40 30 20 Borger TX 105 75 105 80 / 10 30 10 10 Boys Ranch TX 104 72 100 75 / 20 40 10 10 Canyon TX 101 72 99 75 / 10 30 0 10 Clarendon TX 102 73 100 77 / 10 20 0 0 Dalhart TX 101 68 98 71 / 20 40 10 10 Guymon OK 99 70 99 73 / 20 30 10 20 Hereford TX 102 72 99 74 / 10 30 10 10 Lipscomb TX 102 73 101 79 / 10 20 10 20 Pampa TX 102 72 99 78 / 10 20 0 10 Shamrock TX 106 73 102 78 / 10 20 0 0 Wellington TX 105 74 103 79 / 10 20 0 0 && .AMA WATCHES/WARNINGS/ADVISORIES... TX...Heat Advisory from 1 PM this afternoon to 8 PM CDT this evening for TXZ010-015-020-317. OK...None. && $$ SHORT TERM...55 LONG TERM....02 AVIATION...55