714 FXUS64 KEPZ 051809 AFDEPZArea Forecast Discussion National Weather Service El Paso TX/Santa Teresa NM 1209 PM MDT Fri Sep 5 2025
...New DISCUSSION, AVIATION, FIRE WEATHER...
.KEY MESSAGES... Updated at 1118 AM MDT Fri Sep 5 2025
- The risk of heavy rainfall and flash flooding is quite diminished for today and tonight with lighter rain showers prevailing. For Saturday, better heavy rain and flooding potential, although localized, due to higher potential for thunderstorms with heavier rainfall rates.
- Persistent cloud cover and light rain showers will be the main affect from Lorena today and overnight, with somewhat steadier rainfall and slightly higher rain totals in the New Mexico Bootheel.
- There`s now a better chance for more typical, but slow-moving thunderstorms over the Gila and Sacramento Mountains on Saturday as more instability develops. This will be the best window for localized flooding. Showers and thunderstorms will drift south, out of the Gila/Black Range region, towards the lowlands Saturday night.
- Cooler temperatures continue again Saturday with the lingering showers and cloud cover. Warming quickly Sunday and Monday.
- Drier conditions look to prevail Monday into the middle part of next week.
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.DISCUSSION... Issued at 1118 AM MDT Fri Sep 5 2025
The Borderland got it`s first wave of precipitation from the tropical moisture off hurricane Lorena last evening, overnight, and early this morning, with the precip being light and widespread, as expected. 12hr precip totals averaged 0.03-0.08" across all of S NM and Far W TX. At noon Friday, we were between shields of rain, with more light showers tracking toward the Borderland from the SW. CAM models suggest the bulk of the precipitation will stay S of the international Border, and track W to E across N Chihuahua. This would mean we would see our better rainfall across the southern lowlands, and especially the lower Valley of El Paso, and across Hudspeth counties later today and tonight. To the north, we are watching cloudy vs clearing areas over the Gila region, and the maybe (not likely) the Sacs. Any good heating in those areas will likely spawn thunderstorms due to the deep tropical moisture in place. If those do develop, they will have to be watched for heavy rainfall and flash flood potential.
Generally light and sporadic rain shower activity remains possible through the overnight tonight, but we are looking at only a few additional hundreths of an inch of precip with these over the next 12 or so hours. So, that means our potential for heavy rain, and flash flooding is very low, and unlikely.
Things begin to change for Saturday. We top out with the depth of our tropical moisture today, and begins to drop down a bit for Saturday. However, we will remain more moist than average for September. We should see far fewer clouds to the north over the area mountains tomorrow, meaning more surface heating, and thus more mid-day instability. Tomorrow looks a lot less showery, and a lot more stormy, as far as rainfall processes go. With storms, the rainfall rates will be higher than with the stratiform showers last night and this morning. Thus, heavy rain and flash flooding potential will actually rise for local events across the region. Currently, the high-res convection models suggest storms developing over the Gila and the Sacs, and then pushing S across the lowlands, with storms possible over Las Cruces and El Paso, in the evening hours, during the NMSU and UTEP football games.
Sunday we begin to flush out the deep moisture in earnest, as we see a high pressure build to our west. NW flow aloft will pull in dry air, and shove the moist air out to the east. We will see a dramatic drop in shower and storm activity across the entire region, but especially from the Rio Grande westward. We do expect some residual moisture to keep isolated storms in play over area east of the Rio Grande. Sunday will be our first day with temperatures warming back to near normal.
Monday onward, we will watch that ridge to our west form into a high, and shift east across the region. We should see a two-day period, Monday and Tuesday, with few to no storms, and temperatures warming back to seasonal. Mid-week, and beyond, a trough to our west, along with the ridge to our east, may begin to focus a channel of moisture over our western zones for a reintroduction of isolated afternoon storms over the Bootheel and Gila regions of SW NM.
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.AVIATION... (18Z TAFS) Issued at 1118 AM MDT Fri Sep 5 2025
Abundant clouds, and scattered areas of light rain showers will be the theme for the region for the rest of today and overnight tonight. Generally VFR conditions, but with areas of low clouds, and some lowering CIGS w/ -SHRA to bring categories down to MVFR temporarily. VSBYs could be reduced, but not significantly, due to the lighter nature of the precipitation. Expect P6SM to prevail, with some isol area of 4-6 SM. Of note, could be mountain obscurations due low clouds forming on slopes and along ridges, as very moist air upglides and condenses across the region. Winds will favor light to moderate speeds in the 3-8kt range, with some gusts 12-15kts...all from the SW or variable in direction.
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.FIRE WEATHER... Issued at 1118 AM MDT Fri Sep 5 2025
Thanks to a fetch of deep tropical moisture continuing to stream in from former Hurricane Lorena, off the Baja coast, our region is quite juiced, with very low fire weather concerns. The cloudy and cooler nature of the airmass, means low instability, and lesser chances for high-rain rate thunderstorms, favoring instead a lighter rain type from stratiform rainshowers. With the more moist air, and much below seasonal average temperatures, RHs are quite elevated. Winds will be generally light to moderate. The Gila, and possibly the N SACs will break out of the cloud shield, and get some daytime heating, and thus maybe some mid/late afternoon storms. Any storms could produce heavy rain/flash flooding. We expect to see some lingering showers progress W to E across the area overnight, but with a focus across the border lowlands, with diminishing chances away from the border to the north.
For Saturday, it is expected that we will lose a lot of the high- level moisture, and thus see more sunshine, giving rise to more heating and atmospheric instability. This should mean at least scattered shower and thunderstorm development over the Gila region and Sac mountains. This is the setup, still with above ave moisture, where we could see heavy rainfall producing storms, with local flash flooding. It will still be cooler than normal, with elevated RH, and lightish winds.
Sunday begins a better drying, as we see W and NW aloft drive in drier air from the Four Corners area, and push the tropical moisture to our E and S. Thus, we begin to see a rapid reduction in rain/storm chances, a noticeable warming (but still at or below normal), and a slow erosion of good RH values. As we get into Monday and Tuesday, we see the warning and drying trends continue, with most of the region seeing no storms, and temperatures a few degrees above seasonal normals. Afternoon RH may drop into the upper teens by TUE, but nothing elevated or critical to come.
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.PRELIMINARY POINT TEMPS/POPS... El Paso 67 84 68 90 / 30 40 30 10 Sierra Blanca 59 78 60 84 / 40 50 30 30 Las Cruces 61 81 61 87 / 20 40 40 10 Alamogordo 59 82 61 88 / 20 50 40 10 Cloudcroft 43 60 45 66 / 20 70 40 40 Truth or Consequences 61 81 61 87 / 20 60 30 10 Silver City 56 76 56 82 / 30 70 40 10 Deming 62 84 62 90 / 20 50 30 0 Lordsburg 61 82 62 88 / 30 60 30 10 West El Paso Metro 66 81 67 88 / 20 40 30 10 Dell City 61 81 62 88 / 20 40 30 10 Fort Hancock 65 84 67 90 / 50 50 30 20 Loma Linda 59 75 60 82 / 20 50 30 10 Fabens 65 81 65 88 / 30 40 30 10 Santa Teresa 63 80 64 86 / 20 30 30 10 White Sands HQ 62 82 64 88 / 20 50 40 10 Jornada Range 60 81 62 87 / 10 50 50 10 Hatch 62 84 62 90 / 20 50 40 10 Columbus 62 82 64 88 / 30 40 30 0 Orogrande 59 79 60 86 / 20 50 40 10 Mayhill 49 71 51 76 / 10 60 40 40 Mescalero 48 72 49 77 / 20 70 50 30 Timberon 46 68 49 74 / 20 60 40 30 Winston 51 74 50 81 / 30 70 30 10 Hillsboro 57 81 58 87 / 20 60 40 10 Spaceport 59 81 60 88 / 20 60 40 10 Lake Roberts 52 77 52 84 / 40 80 40 20 Hurley 57 78 57 84 / 30 60 30 10 Cliff 59 84 60 89 / 40 70 30 10 Mule Creek 57 80 57 85 / 40 60 20 10 Faywood 57 78 58 84 / 30 60 40 10 Animas 62 82 62 88 / 30 60 30 10 Hachita 60 81 60 86 / 40 50 30 10 Antelope Wells 60 78 60 85 / 50 60 30 10 Cloverdale 59 75 59 81 / 50 70 30 10
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.EPZ WATCHES/WARNINGS/ADVISORIES... TX...None. NM...None. &&
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FORECASTER...14-Bird
NWS EPZ Office Area Forecast Discussion