Alert archive / Montana / Winter Storm Warnings in 2024
Winter Storm Warning 9, NWS Missoula, MT
NWS Missoula, MT issued this winter storm warning at May 22, 2024, 8:25 AM MDT for 6 counties in Montana. It took effect at May 22, 2024, 6:00 PM MDT. It was in force for 18 hr. 28 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 22, 2024, 8:25 AM MDT (14:25 UTC)
- In effect from
- May 22, 2024, 6:00 PM MDT
- Expired
- May 23, 2024, 12:00 PM MDT
- In force
- 18 hr
- Issued by
- NWS Missoula, MT
Counties Deer Lodge County, MT, Granite County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 87 km from the middle of the area, began a volume at 14:24 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 23, 12:00 AM MDT | SNOW 3 | 14 Wnw Seeley Lake, MT | North Fork Jocko SNOTEL at 6330 feet. No additional snow depth increase after midnight. |
| May 23, 5:00 AM MDT | SNOW 3.5 | 3 Nne Stevensville, MT | Power was out since 140am. |
| May 23, 5:31 AM MDT | SNOW 6 | 3 E Florence, MT | Large branches broken off. Power off and on. Power is out as of 730am MDT. |
| May 23, 6:00 AM MDT | SNOW 9 | 6 Ssw Georgetown, MT | Peterson Meadows SNOTEL at 7200 feet. This is a snow depth increase measurement. The snow water equivalent is around 0.60 inches. |
| May 23, 6:11 AM MDT | SNOW 8.5 | 4 Wnw West Valley, MT | 0.55 snow water equivalent, 0.25 inches rain before it turned to snow. 0.80 total water. |
| May 23, 7:00 AM MDT | SNOW 3 | 6 Sw Skalkaho Pass, MT | Snow depth increase at Daly Creek SNOTEL at 5780 ft. Snow water equivalent was 0.50. The high yesterday was 48 degrees. Current 31 F. |
| May 23, 7:00 AM MDT | SNOW 8 | 8 S Janney, MT | Basin Creek SNOTEL at 7180 feet. It has been reporting 2 inch snow depth increase per hour since 5 am. It reported 0.30 of snow water equivalent from 6 to 7 am! 1.00 of total snow water equivalent so far. It continues to snow. |
| May 23, 7:00 AM MDT | SNOW 8 | 9 Nw Philipsburg, MT | Black Pine SNOTEL at 7210 feet snow depth increase. Snow water equivalent is 0.80 inches. |
| May 23, 7:03 AM MDT | SNOW 11 | 6 Sw West Valley, MT | Barker Lakes SNOTEL at 8250 feet. 0.60 inches of snow water equivalent. |
| May 23, 8:00 AM MDT | SNOW 2 | 22 Sw Conner, MT | Nez Perce Camp SNOTEL at 5650 feet. Only 0.20 inches of snow water equivalent. This location did not get under the main heavy deformation band. |
| May 23, 8:00 AM MDT | SNOW 10 | 3 Wnw Georgetown, MT | Social media report, approximately 8 miles south of Philipsburg. |
| May 23, 8:00 AM MDT | SNOW 11 | 8 S Janney, MT | Basin Creek SNOTEL at 7180 ft. Snow depth increase was around 10 inches, but the 1.30 inches of snow water equivalent would suggest more fell. |
| May 23, 8:00 AM MDT | SNOW 12 | 16 W Charlos Heights, MT | Twin Lakes SNOTEL at 6400 feet. 1.00 inch of snow water equivalent. |
| May 23, 8:00 AM MDT | SNOW 14 | 2 S Porters Corner, MT | |
| May 23, 8:13 AM MDT | SNOW 3 | 1 S Clinton, MT | Broken branches. |
| May 23, 9:00 AM MDT | SNOW 6 | 2 Sw Newcomb, MT | 530 to 900am MDT is when they observed the snowfall. 0.58 of total precipitation. The low was 28 and the high was 57 degrees. |
| May 23, 9:00 AM MDT | SNOW 6 | 4 E Corvallis, MT | 1.01 of snow water equivalent. 0.33 of rain fell before it changed to snow. 1.34 inches total precip. |
| May 23, 9:30 AM MDT | SNOW 20 | 2 S Porters Corner, MT | Estimated amount. |
| May 23, 10:00 AM MDT | SNOW 1 | Drummond, MT | |
| May 23, 10:00 AM MDT | SNOW 3.5 | 1 Sse Walkerville, MT | |
| May 23, 10:00 AM MDT | SNOW 5 | 2 Ese Butte, MT | A few telephone lines were down, some branches broken. |
| May 23, 10:00 AM MDT | SNOW 5 | Avon, MT | |
| May 23, 10:00 AM MDT | SNOW 6 | Melrose, MT | Snowed from 630 am until 10 am. Power fluctuated. 1.12 inches of water equivalent which includes rain and snow. 2.05 inches of water for the month of May so far. |
| May 23, 10:00 AM MDT | SNOW 6.5 | 2 Ene Janney, MT | Estimated 6 to 7 inches. |
| May 23, 10:00 AM MDT | SNOW 12 | 1 Ene Elliston, MT | |
| May 23, 10:00 AM MDT | SNOW 14 | 9 E Skalkaho Pass, MT | 300 feet above the Gem Mtn store. |
| May 23, 10:00 AM MDT | SNOW 18 | 5 Sw Porters Corner, MT | |
| May 23, 11:00 AM MDT | SNOW 12 | 9 E Skalkaho Pass, MT | Gem Mountain Mine. Snow started around 4 pm on the 22nd. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 12:00Z, 2.4 hours before the alert went out and 241 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1135 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
286 WWUS45 KMSO 221425 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 825 AM MDT Wed May 22 2024 MTZ006-231430- /O.UPG.KMSO.WS.A.0008.240523T0000Z-240523T1800Z/ /O.NEW.KMSO.WS.W.0009.240523T0000Z-240523T1800Z/ Bitterroot/Sapphire Mountains- 825 AM MDT Wed May 22 2024 ...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON MDT THURSDAY BITTERROOT/SAPPHIRE MOUNTAINS ABOVE 5000 FEET... * WHAT...Heavy snow expected Bitterroot/Sapphire Mountains above 5000 feet. Total snow accumulations between 4 and 19 inches. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Lolo Pass and Highway 93 Sula to Lost Trail Pass. * WHEN...From 6 PM this evening to noon MDT Thursday. The heaviest snow rates are expected midnight to seven am MDT. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-231430- /O.UPG.KMSO.WS.A.0008.240523T0000Z-240523T1800Z/ /O.NEW.KMSO.WS.W.0009.240523T0000Z-240523T1800Z/ Butte/Blackfoot Region- 825 AM MDT Wed May 22 2024 ...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON MDT THURSDAY BUTTE/BLACKFOOT REGION ABOVE 5000 FEET... * WHAT...Heavy snow expected Butte/Blackfoot Region above 5000 feet. Total snow accumulations between 1 and 26 inches. Mountain passes and easily accessible areas should get less than a foot whereas higher elevations and more remote areas will receive the higher amounts. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...MacDonald Pass, Butte, Homestake Pass, and Georgetown Lake. * WHEN...From 6 PM this evening to noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-231430- /O.UPG.KMSO.WS.A.0008.240523T0000Z-240523T1800Z/ /O.NEW.KMSO.WW.Y.0040.240523T0000Z-240523T1800Z/ Western Lemhi County-Eastern Lemhi County- 825 AM MDT Wed May 22 2024 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO NOON MDT THURSDAY LEMHI COUNTY ABOVE 4500 FEET... * WHAT...Snow expected Lemhi County above 4500 feet. Total snow accumulations between 2 and 11 inches. Accumulations above 6 inches are only expected in isolated, very remote locations. * WHERE...Bannock Pass, Highway 28 Tendoy to Lone Pine, Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, and Williams Creek Summit. * WHEN...From 6 PM this evening to noon MDT Thursday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
5 follow-up statements
130 WWUS45 KMSO 222155 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 355 PM MDT Wed May 22 2024 MTZ006-231800- /O.CON.KMSO.WS.W.0009.240523T0000Z-240523T1800Z/ Bitterroot/Sapphire Mountains- 355 PM MDT Wed May 22 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT THURSDAY BITTERROOT/SAPPHIRE MOUNTAINS ABOVE 5000 FEET... * WHAT...Heavy snow expected Bitterroot/Sapphire Mountains above 5000 feet. Total snow accumulations between 4 and 19 inches. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Highway 93 Sula to Lost Trail Pass and Lolo Pass. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-231800- /O.CON.KMSO.WS.W.0009.240523T0000Z-240523T1800Z/ Butte/Blackfoot Region- 355 PM MDT Wed May 22 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT THURSDAY BUTTE/BLACKFOOT REGION ABOVE 5000 FEET... * WHAT...Heavy snow expected Butte/Blackfoot Region above 5000 feet. Total snow accumulations between 1 and 26 inches. Lower elevations, including Butte 2 to 6 inches. Mountain passes and easily accessible areas should get less than a foot whereas higher elevations and more remote areas will receive the higher amounts. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Butte, Homestake Pass, Georgetown Lake, and MacDonald Pass. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-222300- /O.NEW.KMSO.WW.Y.0041.240522T2155Z-240522T2200Z/ Southern Clearwater Mountains- 255 PM PDT Wed May 22 2024 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 3 PM PDT THIS AFTERNOON ABOVE 4000 FEET... * WHAT...Snow Above 4000 feet. Total snow accumulations 1 to 4 inches from 4000 to 5000 feet. 3 to 7 inches above 5000 feet and higher amounts of 7 to 12 inches in the highest terrain. * WHERE...Dixie and Elk City. * WHEN...Until 3 PM PDT this afternoon. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-231800- /O.CON.KMSO.WW.Y.0040.240523T0000Z-240523T1800Z/ Western Lemhi County-Eastern Lemhi County- 355 PM MDT Wed May 22 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT THURSDAY LEMHI COUNTY ABOVE 4500 FEET... * WHAT...Snow expected Lemhi County above 4500 feet. Total snow accumulations between 2 and 11 inches. Accumulations above 6 inches are only expected in isolated, very remote locations. * WHERE...Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, Bannock Pass, Highway 28 Tendoy to Lone Pine, and Williams Creek Summit. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ JK
733 WWUS45 KMSO 222212 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 412 PM MDT Wed May 22 2024 IDZ006-231800- /O.EXP.KMSO.WW.Y.0041.000000T0000Z-240522T2200Z/ /O.EXB.KMSO.WW.Y.0040.240522T2212Z-240523T1800Z/ Southern Clearwater Mountains- 312 PM PDT Wed May 22 2024 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 11 AM PDT THURSDAY ABOVE 4000 FEET... * WHAT...Snow Above 4000 feet. Total snow accumulations 1 to 4 inches from 4000 to 5000 feet. 3 to 7 inches above 5000 feet and higher amounts of 7 to 12 inches in the highest terrain. * WHERE...Dixie and Elk City. * WHEN...Until 11 AM PDT Thursday. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ006-231800- /O.CON.KMSO.WS.W.0009.240523T0000Z-240523T1800Z/ Bitterroot/Sapphire Mountains- 412 PM MDT Wed May 22 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT THURSDAY BITTERROOT/SAPPHIRE MOUNTAINS ABOVE 5000 FEET... * WHAT...Heavy snow expected Bitterroot/Sapphire Mountains above 5000 feet. Total snow accumulations between 4 and 19 inches. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Highway 93 Sula to Lost Trail Pass and Lolo Pass. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-231800- /O.CON.KMSO.WS.W.0009.240523T0000Z-240523T1800Z/ Butte/Blackfoot Region- 412 PM MDT Wed May 22 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT THURSDAY BUTTE/BLACKFOOT REGION ABOVE 5000 FEET... * WHAT...Heavy snow expected Butte/Blackfoot Region above 5000 feet. Total snow accumulations between 1 and 26 inches. Lower elevations, including Butte 2 to 6 inches. Mountain passes and easily accessible areas should get less than a foot whereas higher elevations and more remote areas will receive the higher amounts. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Butte, Homestake Pass, Georgetown Lake, and MacDonald Pass. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-231800- /O.CON.KMSO.WW.Y.0040.240523T0000Z-240523T1800Z/ Western Lemhi County-Eastern Lemhi County- 412 PM MDT Wed May 22 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT THURSDAY LEMHI COUNTY ABOVE 4500 FEET... * WHAT...Snow expected Lemhi County above 4500 feet. Total snow accumulations between 2 and 11 inches. Accumulations above 6 inches are only expected in isolated, very remote locations. * WHERE...Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, Bannock Pass, Highway 28 Tendoy to Lone Pine, and Williams Creek Summit. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ JK
038 WWUS45 KMSO 230324 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 924 PM MDT Wed May 22 2024 MTZ006-231800- /O.CON.KMSO.WS.W.0009.000000T0000Z-240523T1800Z/ Bitterroot/Sapphire Mountains- 924 PM MDT Wed May 22 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT THURSDAY BITTERROOT/SAPPHIRE MOUNTAINS ABOVE 5000 FEET... * WHAT...Heavy snow expected Bitterroot/Sapphire Mountains above 5000 feet. Total snow accumulations between 4 and 19 inches. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Highway 93 Sula to Lost Trail Pass and Lolo Pass. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-231800- /O.CON.KMSO.WS.W.0009.000000T0000Z-240523T1800Z/ Butte/Blackfoot Region- 924 PM MDT Wed May 22 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT THURSDAY BUTTE/BLACKFOOT REGION ABOVE 5000 FEET... * WHAT...Heavy snow expected Butte/Blackfoot Region above 5000 feet. Total snow accumulations between 1 and 26 inches. Lower elevations, including Butte 2 to 6 inches. Mountain passes and easily accessible areas should get less than a foot whereas higher elevations and more remote areas will receive the higher amounts. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Butte, Homestake Pass, Georgetown Lake, and MacDonald Pass. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ005-231600- /O.EXB.KMSO.WW.Y.0040.000000T0000Z-240523T1600Z/ Missoula/Bitterroot Valleys- 924 PM MDT Wed May 22 2024 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 AM MDT THURSDAY... * WHAT...Wet snow. Total snow accumulations of a trace to 3 inches. Locations just above the valley floor may see higher snow amounts. Snow will favor the Bitterroot Valley. * WHERE...Missoula and Bitterroot Valleys. * WHEN...Until 10 AM MDT Thursday. * IMPACTS...Travel could be affected. Heavy, wet snow accumulating on trees could weigh down branches and cause tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-231800- /O.CON.KMSO.WW.Y.0040.000000T0000Z-240523T1800Z/ Southern Clearwater Mountains- 824 PM PDT Wed May 22 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT THURSDAY ABOVE 4000 FEET |... * WHAT...Snow Above 4000 feet. Total snow accumulations 1 to 4 inches from 4000 to 5000 feet. 3 to 7 inches above 5000 feet and higher amounts of 7 to 12 inches in the highest terrain. * WHERE...Dixie and Elk City. * WHEN...Until 11 AM PDT Thursday. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-231800- /O.CON.KMSO.WW.Y.0040.000000T0000Z-240523T1800Z/ Western Lemhi County-Eastern Lemhi County- 924 PM MDT Wed May 22 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT THURSDAY LEMHI COUNTY ABOVE 4500 FEET... * WHAT...Snow expected Lemhi County above 4500 feet. Total snow accumulations between 2 and 11 inches. Accumulations above 6 inches are only expected in isolated, very remote locations. * WHERE...Highway 93 Lost Trail Pass to Gibbonsville, Lemhi Pass, Bannock Pass, Highway 28 Tendoy to Lone Pine, and Williams Creek Summit. * WHEN...Until noon MDT Thursday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ JK
441 WWUS45 KMSO 230749 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 149 AM MDT Thu May 23 2024 MTZ005-231600- /O.UPG.KMSO.WW.Y.0040.000000T0000Z-240523T1600Z/ /O.EXB.KMSO.WS.W.0009.000000T0000Z-240523T1600Z/ Missoula/Bitterroot Valleys- 149 AM MDT Thu May 23 2024 ...WINTER STORM WARNING IN EFFECT UNTIL 10 AM MDT THIS MORNING... * WHAT...Heavy wet snow. Additional snow accumulations up to three inches. Accumulating snow on trees branches will be capable of breaking branches and creating power outages. * WHERE...Missoula and Bitterroot Valley. * WHEN...Until 10 AM MDT this morning. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday morning commute. Snow on trees could cause breaking branches and power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ006-231800- /O.CON.KMSO.WS.W.0009.000000T0000Z-240523T1800Z/ Bitterroot/Sapphire Mountains- 149 AM MDT Thu May 23 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY BITTERROOT/SAPPHIRE MOUNTAINS ABOVE 5000 FEET... * WHAT...Heavy snow expected Bitterroot/Sapphire Mountains above 5000 feet. Total snow accumulations between 4 and 19 inches. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Highway 93 Sula to Lost Trail Pass and Lolo Pass. * WHEN...Until noon MDT today. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-231800- /O.CON.KMSO.WS.W.0009.000000T0000Z-240523T1800Z/ Butte/Blackfoot Region- 149 AM MDT Thu May 23 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY BUTTE/BLACKFOOT REGION ABOVE 5000 FEET... * WHAT...Heavy snow expected Butte/Blackfoot Region above 5000 feet. Total snow accumulations between 1 and 26 inches depending on elevation. Lower elevations, including Butte, expect 2 to 6 inches. Mountain passes and easily accessible areas should get less than a foot whereas higher elevations and more remote areas will receive the higher amounts. Snow rates will exceed 1 inch per hour at times. Snow amounts will vary considerably with changes in elevation. * WHERE...Butte, Georgetown Lake, Homestake Pass, and MacDonald Pass. * WHEN...Until noon MDT today. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ006-231800- /O.CON.KMSO.WW.Y.0040.000000T0000Z-240523T1800Z/ Southern Clearwater Mountains- 1249 AM PDT Thu May 23 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING ABOVE 4000 FEET |... * WHAT...Snow Above 4000 feet. Total snow accumulations 1 to 4 inches from 4000 to 5000 feet. 3 to 7 inches above 5000 feet and higher amounts of 7 to 12 inches in the highest terrain. * WHERE...Elk City and Dixie. * WHEN...Until 11 AM PDT this morning. * IMPACTS...Travel could be affected. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-231800- /O.CON.KMSO.WW.Y.0040.000000T0000Z-240523T1800Z/ Western Lemhi County-Eastern Lemhi County- 149 AM MDT Thu May 23 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY LEMHI COUNTY ABOVE 4500 FEET... * WHAT...Snow expected Lemhi County above 4500 feet. Total snow accumulations between 2 and 11 inches. Accumulations above 6 inches are only expected in isolated, very remote locations. * WHERE...Highway 93 Lost Trail Pass to Gibbonsville, Bannock Pass, Williams Creek Summit, Lemhi Pass, and Highway 28 Tendoy to Lone Pine. * WHEN...Until noon MDT today. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
875 WWUS45 KMSO 231507 WSWMSO URGENT - WINTER WEATHER MESSAGE National Weather Service Missoula MT 907 AM MDT Thu May 23 2024 MTZ005-231615- /O.CAN.KMSO.WS.W.0009.000000T0000Z-240523T1600Z/ Missoula/Bitterroot Valleys- 907 AM MDT Thu May 23 2024 ...WINTER STORM WARNING IS CANCELLED... The heavy snow threat is ending. Watch out for downed trees and tree branches from the earlier snowfall. $$ IDZ006-231615- /O.CAN.KMSO.WW.Y.0040.000000T0000Z-240523T1800Z/ Southern Clearwater Mountains- 807 AM PDT Thu May 23 2024 ...WINTER WEATHER ADVISORY IS CANCELLED... The snow threat is ending. $$ MTZ006-231800- /O.CON.KMSO.WS.W.0009.000000T0000Z-240523T1800Z/ Bitterroot/Sapphire Mountains- 907 AM MDT Thu May 23 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY BITTERROOT/SAPPHIRE MOUNTAINS ABOVE 5000 FEET... * WHAT...Heavy snow Bitterroot/Sapphire Mountains above 5000 feet. Additional snow accumulations of 1-2 inches. * WHERE...Lolo Pass and Highway 93 Sula to Lost Trail Pass. * WHEN...Until noon MDT today. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MTZ007-231800- /O.CON.KMSO.WS.W.0009.000000T0000Z-240523T1800Z/ Butte/Blackfoot Region- 907 AM MDT Thu May 23 2024 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL NOON MDT TODAY BUTTE/BLACKFOOT REGION ABOVE 5000 FEET... * WHAT...Heavy snow Butte/Blackfoot Region above 5000 feet. Additional snow accumulations up to two inches. * WHERE...MacDonald Pass, Homestake Pass, Georgetown Lake, and Butte. * WHEN...Until noon MDT today. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ IDZ009-010-231800- /O.CON.KMSO.WW.Y.0040.000000T0000Z-240523T1800Z/ Western Lemhi County-Eastern Lemhi County- 907 AM MDT Thu May 23 2024 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL NOON MDT TODAY LEMHI COUNTY ABOVE 4500 FEET... * WHAT...Snow Lemhi County above 4500 feet. Additional snow accumulations up to two inches. * WHERE...Highway 93 Lost Trail Pass to Gibbonsville, Highway 28 Tendoy to Lone Pine, Lemhi Pass, Bannock Pass, and Williams Creek Summit. * WHEN...Until noon MDT today. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning commute. Heavy, wet snow accumulating on trees with their leaves out could weigh them down and cause significant tree damages and possibly power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
What forecasters said that day
The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this winter storm warning went out at May 22, 4:06 AM MDT, 4 hours 19 minutes earlier.
Area forecast discussion, May 22, 4:06 AM MDT, 4 hours 19 minutes before
Area Forecast Discussion
National Weather Service Missoula MT
406 AM MDT Wed May 22 2024
...Heavy Snow in the Higher Terrain Across Lemhi County into
Southwest Montana by Thursday Morning...
.DISCUSSION...The strong low pressure system is currently moving
into Washington this morning. The low is still anticipated to
slide towards southern Idaho by tonight then lift towards the
northeast on Thursday over Yellowstone National Park. The path of
this low will bring widespread precipitation to the Northern
Rockies with most locations experiencing rainfall totals in excess
of a half of an inch over the next 48hrs. Snow levels will drop
tonight to around 4500-5500 feet. The bulk of the precipitation
will be across Lemhi county into southwest Montana by Thursday
morning during the lowest snow levels causing significant
snowfall. The Bitterroot, Sapphires and mountains of southwest
Montana are expected to receive over a foot of new snow by
Thursday morning. Lost Trail and Homestake along with portions of
Highway 1 have a 60-80% chance of receiving over 6 inches of new
snow tonight into Thursday morning. The uncertain of this system
is how low will the snow levels become by Thursday morning and
which communities will be impacted by heavy snow. Areas that are
being closely monitored is Philipsburg to Georgetown Lake, Deer
Lodge to Butte and Tendoy to Gilmore Summit.
A second low pressure system is still expected to move through the
region on Saturday causing more widespread precipitation. The
latest guidance is indicating more of a broad system keeping the
snow levels higher, but impacts to mountain passes could be an
issue by Sunday morning.
A ridge of high pressure is still anticipated to for the first
half of next week causing a warming and drying trend.
&&
.AVIATION...The low pressure system is being to make its way into
Washington this morning then track into southern Idaho tonight.
Rain showers are already being experienced in northwest Montana
tonight, even impacting KGPI. The precipitation will be increasing
in coverage and intensity throughout the day along with lowering
ceilings. All terminals will be impacted by this system over the
next 24 hours. Snow levels will be lowering causing the
precipitation to change over to snow tonight for KBTM.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Winter Storm Watch from this evening through Thursday morning
for Bitterroot/Sapphire Mountains...Butte/Blackfoot Region.
ID...Winter Storm Watch from this evening through Thursday morning
for Eastern Lemhi County...Western Lemhi County.
&&The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 8:25 AM MDT | Winter Weather Advisory | MSO | Missoula, Ravalli | 28 hr |
Nearby
Winter Storm Warnings in Montana, 2024Every winter storm warning in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.