517 FXUS64 KEPZ 240511 AFDEPZArea Forecast Discussion National Weather Service El Paso TX/Santa Teresa NM 1111 PM MDT Tue Sep 23 2025
...New DISCUSSION, AVIATION...
.KEY MESSAGES... Updated at 1039 PM MDT Tue Sep 23 2025
- Thunderstorms will be more isolated on Wednesday, mainly focused over the Gila Region and parts of Sierra County. Storms will have a difficult time drifting into the lowlands.
- More widespread precipitation enters the forecast Thursday through early next week, enhancing the risk for flash flooding.
- The pattern supports a risk for some strong to severe thunderstorms late in the week as well.
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.DISCUSSION... Issued at 1055 PM MDT Tue Sep 23 2025
Quite an active day across northern portions of the CWA, with a series of severe thunderstorms rolling across Sierra and Otero Counties. Tomorrow doesn`t look quite as active, as some drier and slightly warmer air aloft sneaks in, but deep layer shear still supports some organized storms. They`ll start over the Gila again, and drift southeast, following enhanced low level moisture and instability laid out near a stalled out backdoor cold front, but the HREF suggests they`ll sputter and dissipate just before reaching Deming and Las Cruces.
Speaking of the backdoor cold front, that`ll be pushing through El Paso right around dawn, with some gusts around 35-40 mph possible in the west side downslope locations. Temperatures will get whittled back about 10 degrees off Tuesday`s highs along the Rio Grande, and as much as 15 degrees out east in Hudspeth County. The front will stall out and weaken near the Continental Divide, where highs will only be a degree or two cooler than Tuesday.
Upper level ridging over Arizona on Wednesday will shift towards the Rio Grande Thursday. But moisture undercutting the backside of the ridge and a bit of a mid-level thermal trough right under the ridge axis will help promote an uptick in thunderstorms across SW New Mexico.
The uptick in thunderstorm coverage will continue through the weekend. The ridge stalls out but weakens on Friday, with cooler air aloft continuing to filter in from the west as a cutoff low carves out over southern California. The overall pattern favors upper level divergence across southern New Mexico, overlaying a plume of "leftover" monsoon moisture in the mid-levels. The GFS also suggests SW flow in the 850-700 mb layer will pull lower level moisture into the area from Sonora. Increasing deep-layer shear and 500 mb temps dropping to around -10C point to the potential for severe thunderstorms as well, as early as Friday in SW New Mexico.
Things become more uncertain heading into Sunday as some tropical moisture may try to get advected up ahead of the cutoff low. That`s where the devil`s in the details and the forecast confidence drops, as it`s also around the same time the cutoff low will begin to lift northeastward.
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.AVIATION... (06Z TAFS) Issued at 1039 PM MDT Tue Sep 23 2025
A few isolated convective showers will be around the ELP area through about 08-09Z, diminishing towards dawn. A backdoor cold front will arrive around 10-12Z, but with just a slight increase in wind at ELP. Otherwise, expect the usual post-frontal enhanced winds at DMN through early afternoon, with light/variable winds at LRU. Isolated convection over the Gila Region will develop after 21-22Z, and drift SE, but the probability of making it to DMN or LRU looks low.
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.FIRE WEATHER... Issued at 1049 AM MDT Tue Sep 23 2025
Low fire danger this week with below normal ERCs and high soil moisture. Min RH 30-40% with light west winds 10 to 15 mph. Vent rates will be Good today and Tuesday afternoon with transport to the east. Scattered showers and thunderstorms across central New Mexico, best chances for LNF.
Cold front arrives from the northeast Wednesday morning, shifting winds to the NE and cooling temperatures back to seasonal. Storm chances continue for southwest New Mexico, especially for GNF on Thursday.
Uptick in storm chances Friday into next weekend as coverage becomes more scattered area wide. Storms will be capable of new lightning starts over forests, but large fire growth is not expected due to light winds and wetness.
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.PRELIMINARY POINT TEMPS/POPS... El Paso 70 83 66 88 / 20 10 20 10 Sierra Blanca 62 76 56 82 / 20 20 20 20 Las Cruces 64 82 61 84 / 20 10 20 10 Alamogordo 61 79 58 84 / 50 10 10 10 Cloudcroft 42 60 41 63 / 60 10 10 10 Truth or Consequences 59 81 59 82 / 30 20 20 30 Silver City 57 81 55 79 / 10 30 40 50 Deming 65 85 62 87 / 10 10 20 20 Lordsburg 64 87 63 86 / 10 20 20 40 West El Paso Metro 69 82 66 85 / 20 10 20 10 Dell City 63 78 57 85 / 20 10 10 0 Fort Hancock 69 83 63 88 / 20 20 20 20 Loma Linda 60 74 57 79 / 20 10 20 10 Fabens 67 83 63 87 / 20 10 20 10 Santa Teresa 66 82 63 85 / 20 10 20 10 White Sands HQ 65 81 62 85 / 20 10 20 10 Jornada Range 61 83 60 83 / 30 10 20 20 Hatch 62 86 60 86 / 20 20 20 30 Columbus 66 86 63 87 / 20 10 20 20 Orogrande 61 79 58 82 / 20 10 20 10 Mayhill 48 65 45 74 / 50 10 10 10 Mescalero 48 70 45 74 / 50 10 0 10 Timberon 47 69 45 72 / 30 10 10 10 Winston 48 76 48 77 / 20 20 30 40 Hillsboro 57 80 56 83 / 20 40 50 50 Spaceport 58 83 58 82 / 30 10 20 20 Lake Roberts 51 79 50 81 / 10 40 50 60 Hurley 58 82 57 81 / 10 30 40 50 Cliff 59 88 58 87 / 10 20 30 40 Mule Creek 56 86 55 84 / 10 20 20 40 Faywood 60 80 57 80 / 10 30 40 40 Animas 64 88 63 87 / 10 20 30 40 Hachita 64 86 61 85 / 10 20 20 20 Antelope Wells 63 85 60 86 / 10 20 20 30 Cloverdale 62 84 60 82 / 10 20 30 60
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.EPZ WATCHES/WARNINGS/ADVISORIES... TX...None. NM...None. &&
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FORECASTER...25-Hardiman
NWS EPZ Office Area Forecast Discussion