Alert archive / Idaho / Winter Storm Warnings in 2021
Winter Storm Warning 4, NWS Boise, ID
NWS Boise, ID issued this winter storm warning at Feb 13, 2021, 10:59 AM MST for 7 counties in Idaho. It was in force for 6 hr. 9 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
- Feb 13, 2021, 10:59 AM MST (17:59 UTC)
- Expired
- Feb 13, 2021, 5:00 PM MST
- In force
- 6 hr
- Issued by
- NWS Boise, ID
Counties Ada County, ID, Canyon County, ID, Elmore County, ID, Gem County, ID, Owyhee County, ID, Payette County, ID, Washington County, ID
The radar
The Boise radar (KCBX), 20 km from the middle of the area, began a volume at 17:59 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 |
|---|---|---|---|
| Feb 13, 11:13 AM MST | SNOW 9.5 | 4 Ese Eagle, ID | STORM TOTAL. |
| Feb 13, 11:29 AM MST | SNOW 10 | 3 Sse Meridian, ID | |
| Feb 13, 11:30 AM MST | SNOW 7.8 | 6 Sse Boise, ID | STORM TOTAL. |
| Feb 13, 12:05 PM MST | SNOW 9 | 6 Sw Boise, ID | STORM TOTAL. |
| Feb 13, 12:50 PM MST | SNOW 9 | 4 Se Boise, ID | STORM TOTAL. |
| Feb 13, 2:28 PM MST | SNOW 11 | 3 Sse Meridian, ID | STORM TOTAL. |
| Feb 13, 4:20 PM MST | SNOW 7 | 1 Wnw Trinity Lakes, ID | STORM TOTAL SNOWFALL AT TRINITY MTN SNOTEL. 7770FT. |
| Feb 13, 4:20 PM MST | SNOW 7 | Se Graham Guard Station, ID | STORM TOTAL SNOWFALL AT GRAHAM GUARD STATION SNOTEL. 5690FT. |
| Feb 13, 4:20 PM MST | SNOW 13 | 2 Nne South Mountain, ID | STORM TOTAL SNOWFALL AT SOUTH MOUNTAIN SNOTEL. 6500FT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 6.0 hours before the alert went out and 16 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
- 522 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
900 WWUS45 KBOI 131759 WSWBOI URGENT - WINTER WEATHER MESSAGE National Weather Service Boise ID 1059 AM MST Sat Feb 13 2021 IDZ014-015-029-140000- /O.CAN.KBOI.WS.W.0003.000000T0000Z-210214T0000Z/ /O.NEW.KBOI.WS.W.0004.210213T1800Z-210214T0000Z/ Upper Treasure Valley-Southwest Highlands-Owyhee Mountains- 1059 AM MST Sat Feb 13 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow continuing. Additional accumulation up to two inches. Winds gusting as high as 40 mph in the afternoon. * WHERE...Upper Treasure Valley, Southwest Highlands and Owyhee Mountains zones. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Snow will decrease after passage of a cold front around midday. 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 can be obtained by calling 5 1 1. && $$ IDZ012-140000- /O.CAN.KBOI.WS.W.0003.000000T0000Z-210213T1800Z/ /O.NEW.KBOI.WS.W.0004.210213T1800Z-210214T0000Z/ Lower Treasure Valley ID- 1059 AM MST Sat Feb 13 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow continuing. Additional accumulation up to one inch. Winds gusting as high as 35 mph in the afternoon. * WHERE...Lower Treasure Valley ID zone. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Snow will decrease after passage of a cold front around noon. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions can be obtained by calling 5 1 1. && $$ ORZ063-064-131900- /O.CAN.KBOI.WS.W.0003.000000T0000Z-210213T1800Z/ Malheur County-Oregon Lower Treasure Valley- 1059 AM MST Sat Feb 13 2021 /959 AM PST Sat Feb 13 2021/ ...WINTER STORM WARNING IS CANCELLED... Snow has generally ended. However, west or northwest winds will gust to 35 mph in the afternoon. $$ IDZ011-013-033-ORZ062-140000- /O.CAN.KBOI.WW.Y.0008.000000T0000Z-210214T0000Z/ /O.NEW.KBOI.WW.Y.0009.210213T1800Z-210214T0000Z/ West Central Mountains-Boise Mountains-Upper Weiser River- Baker County- 1059 AM MST Sat Feb 13 2021 /959 AM PST Sat Feb 13 2021/ ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 PM MST /4 PM PST/ THIS AFTERNOON... * WHAT...Snow continuing. Additional accumulations up to 3 inches except. * WHERE...Mountains in Baker County, Oregon, and mountains north of the Snake Basin in Idaho. * WHEN...Until 5 PM MST /4 PM PST/ this afternoon. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ016-030-140300- /O.CAN.KBOI.WW.Y.0008.000000T0000Z-210214T1200Z/ /O.NEW.KBOI.WW.Y.0009.210213T1800Z-210214T0300Z/ Western Magic Valley-Southern Twin Falls County- 1059 AM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 8 PM MST THIS EVENING... * WHAT...Snow continuing. Additional accumulations up to two inches. Winds gusting as high as 40 mph in the afternoon. * WHERE...Western Magic Valley and Southern Twin Falls County zones. * WHEN...Until 8 PM MST this evening. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$
3 follow-up statements
106 WWUS45 KBOI 132026 WSWBOI URGENT - WINTER WEATHER MESSAGE National Weather Service Boise ID 126 PM MST Sat Feb 13 2021 IDZ012-132130- /O.CAN.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ Lower Treasure Valley ID- 126 PM MST Sat Feb 13 2021 ...WINTER STORM WARNING IS CANCELLED... Snow has decreased to flurries or ended. No further accumulation is expected. $$ IDZ014-015-029-140000- /O.CON.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ Upper Treasure Valley-Southwest Highlands-Owyhee Mountains- 126 PM MST Sat Feb 13 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow continuing. Additional accumulation up to two inches. Winds gusting as high as 40 mph in the afternoon. * WHERE...Upper Treasure Valley, Southwest Highlands and Owyhee Mountains zones. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Snow will decrease after passage of a cold front around midday. 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 can be obtained by calling 5 1 1. && $$ IDZ011-013-033-ORZ062-140000- /O.CON.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ West Central Mountains-Boise Mountains-Upper Weiser River- Baker County- 126 PM MST Sat Feb 13 2021 /1226 PM PST Sat Feb 13 2021/ ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST /4 PM PST/ THIS AFTERNOON... * WHAT...Snow continuing. Additional accumulations up to 2 inches. * WHERE...Mountains in Baker County, Oregon, and mountains north of the Snake Basin in Idaho. * WHEN...Until 5 PM MST /4 PM PST/ this afternoon. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ016-030-140300- /O.CON.KBOI.WW.Y.0009.000000T0000Z-210214T0300Z/ Western Magic Valley-Southern Twin Falls County- 126 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING... * WHAT...Snow continuing. Additional accumulations up to two inches. Winds gusting as high as 40 mph in the afternoon. * WHERE...Western Magic Valley and Southern Twin Falls County zones. * WHEN...Until 8 PM MST this evening. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$
895 WWUS45 KBOI 132109 WSWBOI URGENT - WINTER WEATHER MESSAGE National Weather Service Boise ID 209 PM MST Sat Feb 13 2021 IDZ014-141400- /O.CAN.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ /O.NEW.KBOI.WW.Y.0010.210215T0600Z-210215T1800Z/ Upper Treasure Valley- 209 PM MST Sat Feb 13 2021 ...WINTER STORM WARNING IS CANCELLED... ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM SUNDAY TO 11 AM MST MONDAY... * WHAT...Snow expected. Total snow accumulations of 1 to 3 inches, except up to 4 inches over the mountains. * WHERE...Upper Treasure Valley zone. * WHEN...From 11 PM Sunday to 11 AM MST Monday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Snow will change to rain Monday with temperatures rising to 40 degrees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ ORZ062-141400- /O.CAN.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ /O.NEW.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ Baker County- 109 PM PST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... ...WINTER STORM WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... * WHAT...Heavy snow. New snow accumulations of 3 to 5 inches possible, except up to 10 inches over the mountains. * WHERE...Baker County zone. * WHEN...From Sunday evening through Monday evening. * IMPACTS...Travel could be very difficult to impossible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ029-141400- /O.NEW.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ /O.CON.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ Owyhee Mountains- 209 PM MST Sat Feb 13 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER STORM WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... * WHAT...For the Winter Storm Warning, additional snow accumulations around one inch. Winds gusting as high as 45 mph. For the Winter Storm Watch, heavy snow. New snow accumulations of 3 to 6 inches possible, except up to 9 inches over the mountains. Winds could gust as high as 35 mph with Monday's storm. * WHERE...Owyhee Mountains zone. * WHEN...For the Winter Storm Warning, until 5 PM MST this afternoon. For the Winter Storm Watch, from Sunday evening through Monday evening. * IMPACTS...Travel could be very difficult to impossible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Monitor the latest forecasts for updates on this situation. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ015-140000- /O.CON.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ Southwest Highlands- 209 PM MST Sat Feb 13 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow continuing. Additional accumulation up to two inches. Winds gusting as high as 40 mph in the afternoon. * WHERE...Upper Treasure Valley, Southwest Highlands and Owyhee Mountains zones. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Snow will decrease this afternoon after passage of a cold front. 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 can be obtained by calling 5 1 1. && $$ IDZ013-141400- /O.NEW.KBOI.WW.Y.0010.210215T0600Z-210216T0600Z/ /O.CON.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ Boise Mountains- 209 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM SUNDAY TO 11 PM MST MONDAY... * WHAT...For the current Winter Weather Advisory, snow, additional snow accumulations up to one inch. For the second Winter Weather Advisory, snow expected. Total snow accumulations of 4 to 7 inches, except up to 10 inches over the mountains. Winds gusting as high as 35 mph with that storm. * WHERE...Boise Mountains zone. * WHEN...For the current Winter Weather Advisory, until 5 PM MST this afternoon. For the second Winter Weather Advisory, from 11 PM Sunday to 11 PM MST Monday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snow will change to rain below 4000 feet Monday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ012-ORZ064-141400- /O.NEW.KBOI.WW.Y.0010.210215T0600Z-210215T1800Z/ Lower Treasure Valley ID-Oregon Lower Treasure Valley- 209 PM MST Sat Feb 13 2021 /109 PM PST Sat Feb 13 2021/ ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM MST /10 PM PST/ SUNDAY TO 11 AM MST /10 AM PST/ MONDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 3 inches. * WHERE...In Oregon, Oregon Lower Treasure Valley zone. In Idaho, Lower Treasure Valley ID zone. * WHEN...From 11 PM MST /10 PM PST/ Sunday to 11 AM MST /10 AM PST/ Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning commute. * ADDITIONAL DETAILS...Snow will change to rain by noon Monday with temperatures rising to 40 degrees. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ028-141400- /O.NEW.KBOI.WW.Y.0010.210215T0600Z-210216T0600Z/ Camas Prairie- 209 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM SUNDAY TO 11 PM MST MONDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. Winds gusting as high as 35 mph. * WHERE...Camas Prairie zone. * WHEN...From 11 PM Sunday to 11 PM MST Monday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ011-033-141400- /O.NEW.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ /O.CON.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ West Central Mountains-Upper Weiser River- 209 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...WINTER STORM WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... * WHAT...For the Winter Weather Advisory, additional snow accumulations of up to one inch. For the Winter Storm Watch, heavy snow. Total snow accumulations of 4 to 7 inches possible, except up to 10 inches over the mountains possible. * WHERE...West Central Mountains and Upper Weiser River zones. * WHEN...For the Winter Weather Advisory, until 5 PM MST this afternoon. For the Winter Storm Watch, from Sunday evening through Monday evening. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Monitor the latest forecasts for updates on this situation. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ016-030-140300- /O.CON.KBOI.WW.Y.0009.000000T0000Z-210214T0300Z/ Western Magic Valley-Southern Twin Falls County- 209 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING... * WHAT...Snow continuing. Additional accumulations up to two inches. Winds gusting as high as 40 mph in the afternoon. * WHERE...Western Magic Valley and Southern Twin Falls County zones. * WHEN...Until 8 PM MST this evening. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ ORZ063-141400- /O.NEW.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ Malheur County- 209 PM MST Sat Feb 13 2021 /109 PM PST Sat Feb 13 2021/ ...WINTER STORM WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... * WHAT...Heavy snow. Total snow accumulations of up to 5 inches possible. Winds could gust as high as 35 mph. * WHERE...Malheur County zone. * WHEN...From Sunday evening through Monday evening. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Snow will change to rain below 5000 feet Monday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
200 WWUS45 KBOI 132358 WSWBOI URGENT - WINTER WEATHER MESSAGE National Weather Service Boise ID 458 PM MST Sat Feb 13 2021 IDZ029-141300- /O.EXP.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ /O.CON.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ Owyhee Mountains- 458 PM MST Sat Feb 13 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... ...WINTER STORM WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow possible Sunday night and Monday. Total snow accumulations of 3 to 6 inches, with up to 9 inches over the mountains possible. Winds could gust as high as 35 mph. * WHERE...Owyhee Mountains zone. * WHEN...From Sunday evening through Monday evening. * IMPACTS...Travel could be very difficult to impossible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ015-140100- /O.EXP.KBOI.WS.W.0004.000000T0000Z-210214T0000Z/ Southwest Highlands- 458 PM MST Sat Feb 13 2021 ...WINTER STORM WARNING WILL EXPIRE AT 5 PM MST THIS AFTERNOON... The heavy snow has ended. Any additional light snow will bring little additional accumulation. $$ IDZ013-141300- /O.EXP.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ /O.CON.KBOI.WW.Y.0010.210215T0600Z-210216T0600Z/ Boise Mountains- 458 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 PM MST MONDAY... ...WINTER WEATHER ADVISORY WILL EXPIRE AT 5 PM MST THIS AFTERNOON... * WHAT...Snow expected. Total snow accumulations of 4 to 7 inches, with up to 10 inches over the mountains. Winds gusting as high as 35 mph. * WHERE...Boise Mountains zone. * WHEN...From 11 PM Sunday to 11 PM MST Monday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ011-033-141300- /O.EXP.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ /O.CON.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ West Central Mountains-Upper Weiser River- 458 PM MST Sat Feb 13 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... ...WINTER WEATHER ADVISORY WILL EXPIRE AT 5 PM MST THIS AFTERNOON... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 7 inches with up to 10 inches over the mountains possible. * WHERE...Upper Weiser River and West Central Mountains zones. * WHEN...From Sunday evening through Monday evening. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ IDZ016-030-140100- /O.EXT.KBOI.WW.Y.0009.000000T0000Z-210214T0000Z/ Western Magic Valley-Southern Twin Falls County- 458 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow is tapering off with little additional accumulation expected. * WHERE...Southern Twin Falls County and Western Magic Valley zones. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel will remain difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ012-014-ORZ064-141300- /O.CON.KBOI.WW.Y.0010.210215T0600Z-210215T1800Z/ Lower Treasure Valley ID-Upper Treasure Valley- Oregon Lower Treasure Valley- 458 PM MST Sat Feb 13 2021 /358 PM PST Sat Feb 13 2021/ ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 PM MST /10 PM PST/ SUNDAY TO 11 AM MST /10 AM PST/ MONDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 3 inches. * WHERE...In Oregon, Oregon Lower Treasure Valley zone. In Idaho, Upper Treasure Valley and Lower Treasure Valley ID zones. * WHEN...From 11 PM MST /10 PM PST/ Sunday to 11 AM MST /10 AM PST/ Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ IDZ028-141300- /O.CON.KBOI.WW.Y.0010.210215T0600Z-210216T0600Z/ Camas Prairie- 458 PM MST Sat Feb 13 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 PM MST MONDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. Winds gusting as high as 35 mph. * WHERE...Camas Prairie zone. * WHEN...From 11 PM Sunday to 11 PM MST Monday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions can be obtained by calling 5 1 1. && $$ ORZ062-063-141300- /O.CON.KBOI.WS.A.0002.210215T0600Z-210216T0600Z/ Baker County-Malheur County- 458 PM MST Sat Feb 13 2021 /358 PM PST Sat Feb 13 2021/ ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of 2 to 4 inches, except up to 6 inches over the mountains possible. Winds could gust as high as 35 mph. * WHERE...Malheur County and Baker County zones. * WHEN...From Sunday evening through Monday evening. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
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 Boise, ID wrote its last area forecast discussion before this winter storm warning went out at Feb 13, 9:23 AM MST, 1 hour 36 minutes earlier.
Area forecast discussion, Feb 13, 9:23 AM MST, 1 hour 36 minutes before
Area Forecast Discussion
National Weather Service Boise ID
923 AM MST Sat Feb 13 2021
.DISCUSSION...Ongoing winter storm will send a cold front across
western Idaho before noon and south-central Idaho mid afternoon.
The front will bring a period of enhanced snow followed by gusty
west/northwest winds (in the Snake Basin). At 9 AM MST KCBX radar
at Boise showed enhanced returns in western Idaho, likely
indicating the approaching cold front. The frontal band should
pass through the Boise metro between 10 AM and noon MST then
continue east, reaching the western Magic Valley around 2 PM.
Current winter storm warnings and advisories remain on track.
Total storm snowfall forecasts (beginning 5 PM MST Friday) have
been increased 1-2 inches in the Treasure Valley according to
amounts observed so far. Forecast amounts elsewhere seem on track
at this time.
&&
.AVIATION...MVFR to IFR conditions in snow and low clouds will
continue through early evening. Widespread mountain obscuration
as abundant moisture spreads across all TAF sites. Some improving
conditions west of KBNO and KBKE aft 13/18Z with improving
conditions across Southwest Idaho late this afternoon. Surface
winds: West to southwest 5 to 15 kts, except east to southeast
KTWF through KBOI through 13/18z. Wind shifting to northwest 15
to 25 kts and spreading eastward through the afternoon as the
front slides through the TAF sites. Winds aloft at 10kft MSL:
West 30 to 50 kts then 20 to 30 kts after 14/15z.
Sunday Outlook...A lull in activity is anticipated Sunday but
lingering snow showers are possible across the Idaho West Central
Mountains through the day. A return of wintry conditions
(MVFR/IFR conditions) in low clouds and precipitation Sunday night
thru Monday. Periods of mountain obscuration will continue. Snow
levels on the rise Monday.
&&
.PREV DISCUSSION...
SHORT TERM...Today through Monday night...Snowfall continues with
strongest reflectivity noted over the Treasure Valley and areas
south. Winter Weather related hazards remain in place with no
modifications. Snow will continue today and will be heavy at
times this morning. Improvement expected during the afternoon. A
cold front will arrive into eastern Oregon during the mid- morning
hours, and will mostly be through the area by the mid to late
afternoon hours. This front will bring areas of gusty to breezy
wind, which could create some areas of blowing snow for areas
where the moisture content of the snow was on the lower side.
Additionally, guidance continues to show a threat of freezing rain
for portions of the Treasure Valley this morning, mainly between
Ontario and Mountain Home for areas south of the interstate.
Conditions from this round of moisture should weaken this evening,
with drier conditions expected on Sunday. However, another surge
of moisture expected for Monday, with snowfall anticipated to
impact much of the forecast area. Snowfall amounts could again be
significant, with a potential for travel impacts. Numerical
guidance continues to fluctuate a bit on moisture content with
this upcoming system, with updates expected. Lingering snow will
keep temperatures on the cooler side for the next couple of days,
with values 10 to 15 degrees below normal.
LONG TERM...Tuesday through Saturday...Active weather pattern will
continue through the extended period as more system move through the
westerly flow aloft. Snow showers will be possible Tuesday as a weak
shortwave moves across the region. This isn't likely to bring as
much snow to the region as the previous systems. Upper level
ridge will amplify over the region on Wednesday into Thursday
ahead of another Pacific Storm system. A warm front will switch
the flow aloft to westerly allowing warm air aloft to move in
across the region. It's unclear with this will be strong enough
to remove the cold air in the valleys as models haven't been
handling the temperature profiles well. At the moment, have played
the forecast more pessimistic with the valley seeing mostly snow.
Ensembles show another system for the weekend though the details
vary quite a bit, thus confidence remains low. Again, the overall
extended guidance shows high temperatures in the lower 40s into
the weekend. However, this is likely optimistic since none of
these systems removes the entrenched cold air in the valleys.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Winter Storm Warning until 5 PM MST this afternoon
IDZ014-015-029.
Winter Weather Advisory until 5 PM MST this afternoon
IDZ011-013-033.
Winter Storm Warning until 11 AM MST this morning IDZ012.
Winter Weather Advisory until 5 AM MST Sunday IDZ016-030.
OR...Winter Weather Advisory until 4 PM PST this afternoon ORZ062.
Winter Storm Warning until 11 AM MST /10 AM PST/ this morning
ORZ063-064.
&&
www.weather.gov/Boise
www.facebook.com/NWSBoise
www.twitter.com/NWSBoise
DISCUSSION...LC
AVIATION.....CR
PREV SHORT TERM...KB
PREV LONG TERM....JDSIn the hours before
Local storm report, Feb 13, 8:26 AM MST, 2 hours 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
826 AM MST SAT FEB 13 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM SNOW 4 SE MERIDIAN 43.56N 116.36W
02/13/2021 M5.9 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-27 MERIDIAN 3.9 SE.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0600 AM SNOW 6 SE BOISE 43.55N 116.13W
02/13/2021 M5.1 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-21 BOISE CITY 6.1 SE.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0700 AM SNOW CENTERVILLE 43.90N 115.90W
02/13/2021 M5.0 INCH BOISE ID COCORAHS
COCORAHS STATION ID-BS-10 PLACERVILLE 3.6
SE. THE PERIOD OF THE SNOW EVENT WAS 24
HOURS.
0700 AM SNOW 3 WSW GARDEN CITY 43.62N 116.30W
02/13/2021 M5.0 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-5 BOISE 4.4 WNW. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0700 AM SNOW 4 SE BOISE 43.57N 116.14W
02/13/2021 M5.0 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-46 BOISE 4.7 ESE. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0700 AM SNOW 5 SE MERIDIAN 43.57N 116.32W
02/13/2021 M5.0 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-11 BOISE 6.1 SW. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0800 AM SNOW 4 NNE DONNELLY 44.78N 116.05W
02/13/2021 M4.7 INCH VALLEY ID COCORAHS
COCORAHS STATION ID-VL-1 MCCALL 9.3 SSE. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0730 AM SNOW 5 SSE MERIDIAN 43.55N 116.35W
02/13/2021 M4.7 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-45 MERIDIAN 4.8 SSE.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0700 AM SNOW 4 WNW HOMEDALE 43.65N 117.00W
02/13/2021 M4.2 INCH OWYHEE ID COCORAHS
COCORAHS STATION ID-OW-2 HOMEDALE 4.0 WNW.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0700 AM SNOW 11 ENE BOISE 43.65N 115.99W
02/13/2021 M4.0 INCH BOISE ID COCORAHS
COCORAHS STATION ID-BS-8 BOISE CITY 12.3
ENE. THE PERIOD OF THE SNOW EVENT WAS 24
HOURS.
0655 AM SNOW 3 SSE BOISE 43.57N 116.18W
02/13/2021 M4.0 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-30 BOISE 3.4 SE. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0530 AM SNOW 2 SSE KUNA 43.47N 116.40W
02/13/2021 M3.9 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-7 KUNA 1.5 SSE. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0656 AM SNOW 1 W HUSTON 43.61N 116.80W
02/13/2021 M3.0 INCH CANYON ID COCORAHS
COCORAHS STATION ID-CY-26 CALDWELL 7.3 WSW.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
1030 PM SNOW 1 N IDAHO CITY 43.84N 115.83W
02/12/2021 M3.0 INCH BOISE ID COCORAHS
COCORAHS STATION ID-BS-7 IDAHO CITY 1.1 ESE.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0800 AM SNOW 6 WSW HINES 43.53N 119.19W
02/13/2021 M2.0 INCH HARNEY OR COCORAHS
COCORAHS STATION OR-HY-5 HINES 6.2 WSW. THE
PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0738 AM SNOW 3 ESE FILER 42.54N 114.55W
02/13/2021 M2.0 INCH TWIN FALLS ID COCORAHS
COCORAHS STATION ID-TF-1 TWIN FALLS 4.9 WSW.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
0720 AM SNOW GOODING 42.94N 114.71W
02/13/2021 M1.5 INCH GOODING ID COCORAHS
COCORAHS STATION ID-GD-3 GOODING 0.2 NNE.
THE PERIOD OF THE SNOW EVENT WAS 24 HOURS.
&&Local storm report, Feb 13, 9:47 AM MST, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BOISE ID
947 AM MST SAT FEB 13 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0630 AM SNOW 1 N BOISE 43.63N 116.20W
02/13/2021 M4.0 INCH ADA ID COCORAHS
COCORAHS STATION ID-AD-9 BOISE 2.1 NNE.
0700 AM SNOW 1 NNE FILER 42.58N 114.61W
02/13/2021 M1.5 INCH TWIN FALLS ID COCORAHS
COCORAHS STATION ID-TF-7 FILER 0.6 NNE.
0700 AM SNOW 1 NE MURPHY HOT SPRINGS 42.03N 115.35W
02/13/2021 M2.0 INCH OWYHEE ID CO-OP OBSERVER
CO-OP OBSERVER STATION MHSI1 MURPHY HOT
SPRINGS.
0730 AM SNOW 1 ENE MIDDLETON 43.71N 116.61W
02/13/2021 M3.0 INCH CANYON ID COCORAHS
COCORAHS STATION ID-CY-12 MIDDLETON 0.7 ENE.
0800 AM SNOW 2 N GLENNS FERRY 42.98N 115.30W
02/13/2021 M1.0 INCH ELMORE ID COCORAHS
COCORAHS STATION ID-EL-1 GLENNS FERRY 1.6 N.
&&The office that day
Everything else NWS Boise, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 13, 10:59 AM MST | Winter Weather Advisory | BOI | Adams, Boise, Camas, Elmore, Gem, Gooding and 4 more | 6 hr |
| Feb 13, 2:09 PM MST | Winter Storm Watch | BOI | Adams, Gem, Owyhee, Valley, Washington | 12 hr |
| Feb 13, 2:09 PM MST | Winter Weather Advisory | BOI | Ada, Adams, Boise, Camas, Canyon, Elmore and 8 more | 63 hr |
Nearby
Winter Storm Warnings in Idaho, 2021Every winter storm warning in 2021
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.