Alert archive / Arizona / Winter Storm Watches in 2021
Winter Storm Watch 2, NWS Tucson, AZ
NWS Tucson, AZ issued this winter storm watch at Dec 29, 2021, 2:27 PM MST for 6 counties in Arizona. It took effect at Dec 30, 2021, 11:00 PM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 29, 2021, 2:27 PM MST (21:27 UTC)
- In effect from
- Dec 30, 2021, 11:00 PM MST
- Expired
- Dec 30, 2021, 2:25 PM MST
- In force
- Issued by
- NWS Tucson, AZ
Counties Cochise County, AZ, Graham County, AZ, Greenlee County, AZ, Pima County, AZ, Pinal County, AZ, Santa Cruz County, AZ
The radar
The Tucson radar (KEMX), 61 km from the middle of the area, began a volume at 21:29 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.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 9.5 hours before the alert went out and 49 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
- 29 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 705 m above ground
- 0-6 km bulk shear
- 80 kt
- 0-1 km storm-relative helicity
- 271 m²/s²
- 0-3 km storm-relative helicity
- 278 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
286 WWUS45 KTWC 292127 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 227 PM MST Wed Dec 29 2021 AZZ511>514-301200- /O.NEW.KTWC.WS.A.0002.211231T0000Z-220101T1800Z/ Galiuro and Pinaleno Mountains-Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Catalina and Rincon Mountains- Including the cities of Mount Graham, Chiricahua NM, Bisbee, Canelo Hills, Mount Lemmon, and Summerhaven 227 PM MST Wed Dec 29 2021 ...WINTER STORM WATCH IN EFFECT ABOVE 7000 FT FROM LATE THURSDAY AFTERNOON THROUGH SATURDAY MORNING... * WHAT...Heavy wet snow possible. Total snow accumulations of 12 to 24 inches are possible above 7000 ft. Winds could gust as high as 40 mph Friday and Friday night. * WHERE...Galiuro and Pinaleno Mountains, Chiricahua Mountains, Huachuca and Santa Rita Mountains and Catalina and Rincon Mountains above 7000 ft. * WHEN...From Late Thursday afternoon through Saturday morning. * IMPACTS...Plan on slippery road conditions and significantly reduced visibility in any blowing snow. Bursts of heavy snow may make travel very difficult at best. * ADDITIONAL DETAILS...At this time the focus of the heaviest precipitation should be late Thursday night into Friday evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow accumulations that may seriously impact travel. Gusty winds and blowing snow is also possible. Those planning travel into the watch area should prepare for difficult winter driving conditions. && $$ AZZ510-301200- /O.NEW.KTWC.WS.A.0002.211231T0600Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Including the city of Hannagan Meadow 227 PM MST Wed Dec 29 2021 ...WINTER STORM WATCH IN EFFECT ABOVE 7000 FT FROM LATE THURSDAY EVENING THROUGH SATURDAY MORNING... * WHAT...Heavy wet snow possible. Total snow accumulations of 12 to 24 inches are possible above 7000 ft. Winds could gust as high as 40 mph Friday and Friday night. * WHERE...White Mountains of Graham and Greenlee Counties. * WHEN...From late Thursday evening through Saturday morning. * IMPACTS...Plan on slippery road conditions and significantly reduced visibility in any blowing snow. Bursts of heavy snow may make travel very difficult at best. * ADDITIONAL DETAILS...At this time the focus of the heaviest precipitation should be late Thursday night into Friday evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow accumulations that may seriously impact travel. Gusty winds and blowing snow is also possible. Those planning travel into the watch area should prepare for difficult winter driving conditions. && $$ Cerniglia Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
2 follow-up statements
406 WWUS45 KTWC 300919 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 219 AM MST Thu Dec 30 2021 AZZ511>514-302300- /O.EXT.KTWC.WS.A.0002.211231T0600Z-220101T1800Z/ Galiuro and Pinaleno Mountains-Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Catalina and Rincon Mountains- Including the cities of Mount Graham, Chiricahua NM, Bisbee, Canelo Hills, Mount Lemmon, and Summerhaven 219 AM MST Thu Dec 30 2021 ...WINTER STORM WATCH NOW IN EFFECT FROM LATER TONIGHT THROUGH SATURDAY MORNING... * WHAT...Heavy wet snow possible. Total snow accumulations of 12 to 24 inches are possible above 7000 ft. Winds could gust as high as 40 mph Friday and Friday night. * WHERE...Galiuro and Pinaleno Mountains, Chiricahua Mountains, Huachuca and Santa Rita Mountains and Catalina and Rincon Mountains above 7000 ft. * WHEN...From late tonight through Saturday morning. * IMPACTS...Plan on slippery road conditions and significantly reduced visibility in any blowing snow. Bursts of heavy snow may make travel very difficult at best. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow accumulations that may seriously impact travel. Gusty winds and blowing snow is also possible. Those planning travel into the watch area should prepare for difficult winter driving conditions. && $$ AZZ510-302300- /O.EXT.KTWC.WS.A.0002.211231T1200Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Including the city of Hannagan Meadow 219 AM MST Thu Dec 30 2021 ...WINTER STORM WATCH NOW IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY MORNING... * WHAT...Heavy wet snow possible. Total snow accumulations of 12 to 24 inches are possible above 7000 ft. Winds could gust as high as 40 mph Friday and Friday night. * WHERE...White Mountains of Graham and Greenlee Counties. * WHEN...From early Friday morning through Saturday morning. * IMPACTS...Plan on slippery road conditions and significantly reduced visibility in any blowing snow. Bursts of heavy snow may make travel very difficult at best. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow accumulations that may seriously impact travel. Gusty winds and blowing snow is also possible. Those planning travel into the watch area should prepare for difficult winter driving conditions. && $$ Meyer Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
599 WWUS45 KTWC 302125 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 225 PM MST Thu Dec 30 2021 AZZ511-311200- /O.UPG.KTWC.WS.A.0002.211231T0600Z-220101T1800Z/ /O.NEW.KTWC.WS.W.0002.211231T1200Z-220101T1800Z/ Galiuro and Pinaleno Mountains- Including the city of Mount Graham 225 PM MST Thu Dec 30 2021 ...WINTER STORM WARNING IN EFFECT ABOVE 6500 FEET FROM 5 AM FRIDAY TO 11 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 24 inches above 8000 feet and 6 to 18 inches between 6500 feet and 8000 feet. Winds gusting as high as 45 mph. * WHERE...Pinaleno Mountains. * WHEN...From 5 AM Friday to 11 AM MST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means heavy snow accumulations are expected. Gusty winds and blowing snow are also possible. This will make travel very difficult or impossible...especially in the mountains. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ AZZ510-311200- /O.UPG.KTWC.WS.A.0002.211231T1200Z-220101T1800Z/ /O.NEW.KTWC.WS.W.0002.211231T1200Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Including the city of Hannagan Meadow 225 PM MST Thu Dec 30 2021 ...WINTER STORM WARNING IN EFFECT ABOVE 6500 FEET FROM 5 AM FRIDAY TO 11 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches above 8000 feet and 6 to 18 inches between 6500 feet and 8000 feet. Winds gusting as high as 45 mph. * WHERE...White Mountains of Graham and Greenlee Counties. * WHEN...From 5 AM Friday to 11 AM MST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means heavy snow accumulations are expected. Gusty winds and blowing snow are also possible. This will make travel very difficult or impossible...especially in the mountains. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ AZZ514-311200- /O.UPG.KTWC.WS.A.0002.211231T0600Z-220101T1800Z/ /O.NEW.KTWC.WS.W.0002.211231T1800Z-220101T1800Z/ Catalina and Rincon Mountains- Including the cities of Mount Lemmon and Summerhaven 225 PM MST Thu Dec 30 2021 ...WINTER STORM WARNING IN EFFECT ABOVE 7000 FEET FROM 11 AM FRIDAY TO 11 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches above 8000 feet and 6 to 18 inches between 6500 feet and 8000 feet. Winds gusting as high as 45 mph. * WHERE...Catalina and Rincon Mountains. * WHEN...From 11 AM Friday to 11 AM MST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means heavy snow accumulations are expected. Gusty winds and blowing snow are also possible. This will make travel very difficult or impossible...especially in the mountains. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ AZZ512-513-311200- /O.UPG.KTWC.WS.A.0002.211231T0600Z-220101T1800Z/ /O.NEW.KTWC.WW.Y.0006.211231T1800Z-220101T1800Z/ Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including the cities of Chiricahua NM and Canelo Hills 225 PM MST Thu Dec 30 2021 ...WINTER WEATHER ADVISORY IN EFFECT ABOVE 7000 FEET FROM 11 AM FRIDAY TO 11 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations 6 to 12 inches above 7000 feet, locally higher on the mountain peaks. Winds gusting as high as 45 mph. * WHERE...Chiricahua Mountains and Huachuca and Santa Rita Mountains. * WHEN...From 11 AM Friday to 11 AM MST Saturday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning or evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
Nearby
Winter Storm Watches in Arizona, 2021Every winter storm watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.