FNUS55 KREV 180958 FWFREV Fire Weather Planning Forecast National Weather Service Reno NV 258 AM PDT Mon May 18 2026 .DISCUSSION... After a cold morning, a warming trend will begin this week with temperatures reaching back to near season averages by Tuesday, then reaching the 80s again by mid-week (70s Sierra valleys). Brisk northeast winds will prevail through Tuesday before our typical afternoon Zephyr west breezes return by Wednesday. Otherwise expect dry conditions through the week with only a low (<10% chance) of isolated showers by next weekend. Note: Thunderstorms imply gusty and erratic winds. Note: Mixing Heights are in feet above ground level of the valley floors. Note: Please see operating plan for detailed zone descriptions https://www.weather.gov/wrh/fire?wfo=rev NVZ420-190030- Northern Sierra Front including Carson City, Douglas, Storey, Southern Washoe, Western Lyon, and Far Southern Lassen Counties- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........58-67. * Mid Slope........53-63. * 24 hr trend......7 degrees warmer. * Min Humidity....... * Valleys..........4-14%. * Mid Slope........9-17%. * 24 hr trend......7% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 9 to 14 mph. Gusts to 20 mph in the morning. * Ridge Top........Northeast winds 10 to 15 mph. Gusts to 40 mph until late afternoon. * Mixing Height......2100-3100 ft agl increasing to 7000-8000 ft agl in the afternoon. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........28-38. * Mid Slope........31-41. * 24 hr trend......4 degrees warmer. * Max Humidity....... * Valleys..........31-41%. * Mid Slope........25-35%. * 24 hr trend......17% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 9 to 14 mph in the evening becoming downslope 2 to 5 mph. * Ridge Top........Light winds. * Mixing Height......4500-5500 ft agl in the evening then 200-500 ft agl. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........64-74. * Mid Slope........60-70. * Min Humidity....... * Valleys..........4-14%. * Mid Slope........8-14%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph becoming east 7 to 12 mph in the late morning and afternoon. * Ridge Top........Light winds. * Mixing Height......2900-3900 ft agl increasing to 7400-8400 ft agl in the afternoon. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Good increasing to excellent in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 35-45. Downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 71-81. Lows 35-45. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 76-86. Lows 40-50. West winds 10 to 15 mph. .SATURDAY THROUGH SUNDAY...Clear. Highs 78-88. Lows 43-53. $$ NVZ421-190030- Southern Sierra Front including Alpine, Northern Mono, Southern Lyon, and Western Mineral Counties- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........53-63. * Mid Slope........47-57. * 24 hr trend......Little change. * Min Humidity....... * Valleys..........10-18%. * Mid Slope........9-19%. * 24 hr trend......13% drier. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph becoming north 9 to 16 mph with gusts to 25 mph in the late morning and afternoon. * Ridge Top........Northeast winds 15 to 25 mph with gusts to 50 mph. * Mixing Height......1800-2800 ft agl increasing to 5600-6600 ft agl in the afternoon. * Transport Winds....Northeast 10 to 20 mph. * Ventilation........Good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........24-34. * Mid Slope........31-41. * 24 hr trend......5 degrees warmer. * Max Humidity....... * Valleys..........39-49%. * Mid Slope........27-37%. * 24 hr trend......20% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 9 to 16 mph with gusts to 25 mph in the evening becoming downslope 2 to 5 mph. * Ridge Top........Northeast winds 10 to 15 mph with gusts to 25 mph shifting to the east in the morning. * Mixing Height......3600-4600 ft agl decreasing to 600 ft agl after midnight. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........61-71. * Mid Slope........55-65. * Min Humidity....... * Valleys..........7-17%. * Mid Slope........7-17%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph becoming northeast 9 to 14 mph in the afternoon. * Ridge Top........Northeast winds 9 to 14 mph. * Mixing Height......2600-3600 ft agl increasing to 7600-8600 ft agl in the afternoon. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Good increasing to excellent in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 29-39. North winds 9 to 15 mph shifting to the northeast 5 to 10 mph in the evening, then becoming downslope 2 to 5 mph after midnight. .WEDNESDAY...Clear. Highs 68-78. Lows 29-39. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 74-84. Lows 34-44. West winds 10 to 15 mph. .SATURDAY THROUGH SUNDAY...Clear. Highs 75-85. Lows 36-46. $$ CAZ272-190030- Greater Lake Tahoe and Truckee Area- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........51-58. * Mid Slope........46-56. * 24 hr trend......Little change. * Min Humidity....... * Valleys..........14-24%. * Mid Slope........13-23%. * 24 hr trend......14% drier. * 20-Foot Winds...... * Valleys/Slope....East winds 9 to 17 mph with gusts to 45 mph decreasing to 7 to 12 mph with gusts to 20 mph late in the afternoon. * Ridge Top........East winds 20 to 35 mph with gusts to 60 mph decreasing to 15 to 20 mph with gusts to 30 mph late in the afternoon. * Mixing Height......1600-2600 ft agl increasing to 5900-6900 ft agl in the afternoon. * Transport Winds....East 15 to 25 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........28-38. * Mid Slope........28-38. * 24 hr trend......Little change. * Max Humidity....... * Valleys..........51-61%. * Mid Slope........31-41%. * 24 hr trend......14% drier. * 20-Foot Winds...... * Valleys/Slope....East winds 7 to 12 mph with gusts to 20 mph in the evening becoming downslope 2 to 5 mph. * Ridge Top........East winds 10 to 15 mph with gusts to 30 mph. * Mixing Height......3900-4900 ft agl decreasing to 600 ft agl after midnight. * Transport Winds....East 10 to 15 mph. * Ventilation........Excellent decreasing to marginal after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........58-68. * Mid Slope........54-64. * Min Humidity....... * Valleys..........13-23%. * Mid Slope........12-22%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph. * Ridge Top........East winds 10 to 15 mph. Gusts to 25 mph in the morning. * Mixing Height......2300-3300 ft agl increasing to 6300-7300 ft agl in the afternoon. * Transport Winds....East 10 to 15 mph. * Ventilation........Good increasing to very good in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 31-41. Downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 64-74. Lows 31-41. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 68-78. Lows 35-45. Slope winds. .SATURDAY THROUGH SUNDAY...Clear. Highs 68-78. Lows 36-46. $$ NVZ423-190030- West Humboldt Basin in Pershing County- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny then becoming partly cloudy. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........61-67. * Mid Slope........55-65. * 24 hr trend......9 degrees warmer. * Min Humidity....... * Valleys..........11-17%. * Mid Slope........11-21%. * 24 hr trend......9% drier. * 20-Foot Winds...... * Valleys/Slope....North winds 9 to 14 mph with gusts to 25 mph. * Ridge Top........North winds 10 to 15 mph. Gusts to 35 mph until late afternoon. * Mixing Height......2200-3200 ft agl increasing to 8200-9200 ft agl in the afternoon. * Transport Winds....North 10 to 20 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Mostly cloudy then becoming clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........31-41. * Mid Slope........33-42. * 24 hr trend......4 degrees warmer. * Max Humidity....... * Valleys..........37-47%. * Mid Slope........25-35%. * 24 hr trend......20% drier. * 20-Foot Winds...... * Valleys/Slope....North winds 9 to 14 mph until early morning becoming downslope 2 to 5 mph. * Ridge Top........Northeast winds 10 to 15 mph. * Mixing Height......4900-5900 ft agl in the evening then 200-500 ft agl. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........69-75. * Mid Slope........62-72. * Min Humidity....... * Valleys..........8-13%. * Mid Slope........9-15%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph. * Ridge Top........Light winds. * Mixing Height......3400-4400 ft agl increasing to 9500-10500 ft agl in the afternoon. * Transport Winds....Light winds. * Ventilation........Good increasing to very good in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 36-46. Downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 75-83. Lows 36-46. Slope winds. .THURSDAY...Clear. Highs 79-87. Lows 42-52. Slope winds. .FRIDAY...Partly cloudy. Highs 82-90. Lows 46-56. West winds 10 to 15 mph. .SATURDAY THROUGH SUNDAY...Clear. Highs 84-92. Lows 47-57. $$ NVZ429-190030- Lahontan Basin including Churchill and Eastern Mineral Counties- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........58-68. * Mid Slope........53-63. * 24 hr trend......7 degrees warmer. * Min Humidity....... * Valleys..........10-16%. * Mid Slope........11-17%. * 24 hr trend......11% drier. * 20-Foot Winds...... * Valleys/Slope....North winds 9 to 15 mph. * Ridge Top........North winds 10 to 20 mph. Gusts to 35 mph until late afternoon. * Mixing Height......2100-3100 ft agl increasing to 7400-8400 ft agl in the afternoon. * Transport Winds....North 10 to 15 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........29-39. * Mid Slope........33-43. * 24 hr trend......5 degrees warmer. * Max Humidity....... * Valleys..........34-44%. * Mid Slope........26-36%. * 24 hr trend......19% drier. * 20-Foot Winds...... * Valleys/Slope....North winds 9 to 15 mph until early morning becoming downslope 2 to 5 mph. * Ridge Top........Northeast winds 10 to 15 mph. Gusts to 25 mph in the evening. * Mixing Height......4800-5800 ft agl in the evening then 200-500 ft agl. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........64-74. * Mid Slope........60-70. * Min Humidity....... * Valleys..........7-12%. * Mid Slope........8-13%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph becoming north 7 to 12 mph in the afternoon. * Ridge Top........Light winds. * Mixing Height......3200-4200 ft agl increasing to 8500-9500 ft agl in the afternoon. * Transport Winds....Light winds. * Ventilation........Good increasing to excellent in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 34-44. North winds 8 to 13 mph in the evening becoming downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 71-81. Lows 34-44. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 78-88. Lows 41-51. West winds 10 to 15 mph. .SATURDAY THROUGH SUNDAY...Clear. Highs 80-90. Lows 46-56. $$ CAZ270-278-NVZ458-190030- Surprise Valley California-Eastern Lassen County- Northern Washoe County- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny then becoming partly cloudy. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........58-68. * Mid Slope........54-62. * 24 hr trend......8 degrees warmer. * Min Humidity....... * Valleys..........7-17%. * Mid Slope........10-18%. * 24 hr trend......7% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 9 to 14 mph with gusts to 25 mph. * Ridge Top........Northeast winds 10 to 15 mph. Gusts to 35 mph. * Mixing Height......2100-3100 ft agl increasing to 8400-9400 ft agl in the afternoon. * Transport Winds....Northeast 10 to 20 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Partly cloudy then becoming clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........29-39. * Mid Slope........31-41. * 24 hr trend......4 degrees warmer. * Max Humidity....... * Valleys..........38-48%. * Mid Slope........28-38%. * 24 hr trend......23% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 8 to 13 mph in the evening becoming downslope 2 to 5 mph. * Ridge Top........Light winds. * Mixing Height......5100-6100 ft agl in the evening then 200-500 ft agl. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........65-75. * Mid Slope........62-70. * Min Humidity....... * Valleys..........6-16%. * Mid Slope........9-17%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph becoming east 7 to 12 mph in the afternoon. * Ridge Top........Light winds. * Mixing Height......3100-4100 ft agl increasing to 9000-10000 ft agl in the afternoon. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Good increasing to excellent in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 34-44. Downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 72-82. Lows 34-44. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 77-87. Lows 39-49. West winds 10 to 15 mph. .SATURDAY THROUGH SUNDAY...Clear. Highs 79-89. Lows 40-50. $$ CAZ271-190030- Western Lassen, Eastern Plumas, and Eastern Sierra Counties- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........57-67. * Mid Slope........54-62. * 24 hr trend......8 degrees warmer. * Min Humidity....... * Valleys..........12-20%. * Mid Slope........12-22%. * 24 hr trend......7% drier. * 20-Foot Winds...... * Valleys/Slope....East winds 8 to 13 mph with gusts to 25 mph. * Ridge Top........East winds 10 to 15 mph. Gusts to 50 mph decreasing to 30 mph in the afternoon. * Mixing Height......2000-3000 ft agl increasing to 7800-8800 ft agl in the afternoon. * Transport Winds....East 15 to 25 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........28-38. * Mid Slope........29-39. * 24 hr trend......Little change. * Max Humidity....... * Valleys..........49-59%. * Mid Slope........31-41%. * 24 hr trend......18% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 5 to 10 mph in the evening becoming downslope 2 to 5 mph. * Ridge Top........Light winds becoming east 10 to 15 mph after midnight. Gusts to 25 mph after midnight. * Mixing Height......5000-6000 ft agl in the evening then 200-500 ft agl. * Transport Winds....East 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........64-74. * Mid Slope........62-70. * Min Humidity....... * Valleys..........11-19%. * Mid Slope........11-21%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph. * Ridge Top........Light winds. Gusts to 20 mph in the morning. * Mixing Height......2800-3800 ft agl increasing to 8600-9600 ft agl in the afternoon. * Transport Winds....Northeast 10 to 15 mph. * Ventilation........Very good increasing to excellent in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 32-42. Downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 70-80. Lows 32-42. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 74-84. Lows 35-45. West winds 10 to 15 mph. .SATURDAY THROUGH SUNDAY...Clear. Highs 74-84. Lows 36-46. $$ CAZ274-190030- Southern Mono County- 258 AM PDT Mon May 18 2026 .TODAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........51-61. * Mid Slope........46-56. * 24 hr trend......6 degrees cooler. * Min Humidity....... * Valleys..........6-16%. * Mid Slope........8-18%. * 24 hr trend......13% drier. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph becoming north 8 to 13 mph in the late morning and afternoon. Gusts to 25 mph. * Ridge Top........North winds 15 to 25 mph with gusts to 45 mph. * Mixing Height......2100-3100 ft agl increasing to 5200-6200 ft agl in the afternoon. * Transport Winds....North 15 to 25 mph. * Ventilation........Very good increasing to excellent in the afternoon. .TONIGHT... * Sky/Weather........Clear. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Min Temperature.... * Valleys..........24-34. * Mid Slope........24-33. * 24 hr trend......5 degrees warmer. * Max Humidity....... * Valleys..........39-49%. * Mid Slope........29-39%. * 24 hr trend......15% drier. * 20-Foot Winds...... * Valleys/Slope....Northeast winds 9 to 15 mph with gusts to 30 mph in the evening becoming downslope 2 to 5 mph. * Ridge Top........North winds 10 to 15 mph with gusts to 25 mph. * Mixing Height......3800-4800 ft agl decreasing to 600 ft agl after midnight. * Transport Winds....North 10 to 15 mph. * Ventilation........Excellent decreasing to poor after midnight. .TUESDAY... * Sky/Weather........Sunny. * Chance of Thunder..0%. * Chc Wetting Rain...0%. * Max Temperature.... * Valleys..........58-68. * Mid Slope........54-64. * Min Humidity....... * Valleys..........9-19%. * Mid Slope........10-20%. * 20-Foot Winds...... * Valleys/Slope....Upslope 4 to 8 mph. * Ridge Top........Light winds. * Mixing Height......2600-3600 ft agl increasing to 7600-8600 ft agl in the afternoon. * Transport Winds....North 10 to 15 mph. * Ventilation........Good increasing to excellent in the afternoon. .Extended... .TUESDAY NIGHT...Clear. Lows 29-39. Northeast winds 7 to 12 mph in the evening becoming downslope 2 to 5 mph. .WEDNESDAY...Clear. Highs 64-74. Lows 29-39. Slope winds. .THURSDAY THROUGH FRIDAY...Clear. Highs 70-80. Lows 33-43. Slope winds. .SATURDAY THROUGH SUNDAY...Clear. Highs 71-81. Lows 37-47. $$ .8 to 14 day outlook for (Mon May 25 through Sun May 31) Above normal temperatures and near normal precipitation. = $$ http://weather.gov/reno