Alert archive / Arizona / Winter Storm Warnings in 2021
Winter Storm Warning 2, NWS Tucson, AZ
NWS Tucson, AZ issued this winter storm warning at Dec 30, 2021, 2:25 PM MST for 5 counties in Arizona. It took effect at Dec 31, 2021, 5:00 AM MST. It was in force for 30 hr. 4 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
- Dec 30, 2021, 2:25 PM MST (21:25 UTC)
- In effect from
- Dec 31, 2021, 5:00 AM MST
- Expired
- Jan 1, 2022, 11:00 AM MST
- In force
- 30 hr
- Issued by
- NWS Tucson, AZ
Counties Cochise County, AZ, Graham County, AZ, Greenlee County, AZ, Pima County, AZ, Pinal County, AZ
The radar
The Tucson radar (KEMX), 82 km from the middle of the area, began a volume at 21:25 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 |
|---|---|---|---|
| Jan 1, 8:00 AM MST | SNOW 7 | 5 Se Summerhaven, AZ | COOP OBSERVER REPORTED 7 INCHES OF NEW SNOW NEAR WILLOW CANYON IN THE LAST 24 HOURS. |
| Jan 1, 8:00 AM MST | SNOW 10 | Summerhaven, AZ | 10 INCHES OF NEW SNOW WAS MEASURED IN SUMMERHAVEN OVER THE LAST 24 HOURS. |
| Jan 1, 8:00 AM MST | SNOW 11 | Summerhaven, AZ | SOCIAL MEDIA REPORT OF 11 INCHES OF NEW SNOW MEASURED IN SUMMERHAVEN WITHIN LAST 24 HOURS. |
| Jan 1, 10:00 AM MST | SNOW 7 | 1 Nne Summerhaven, AZ | MOUNT LEMMON FIRE DEPARTMENT REPORTED 7 INCH OF NEW SNOW IN THE LAST 24 HOURS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 12:00Z, 9.4 hours before the alert went out and 67 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
- 2 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 267 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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
4 follow-up statements
611 WWUS45 KTWC 311010 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 310 AM MST Fri Dec 31 2021 AZZ510-511-312300- /O.CON.KTWC.WS.W.0002.211231T1200Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Galiuro and Pinaleno Mountains- Including the cities of Hannagan Meadow and Mount Graham 310 AM MST Fri Dec 31 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 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. && $$ AZZ514-312300- /O.CON.KTWC.WS.W.0002.211231T1800Z-220101T1800Z/ Catalina and Rincon Mountains- Including the cities of Mount Lemmon and Summerhaven 310 AM MST Fri Dec 31 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 AM MST SATURDAY... * WHAT...Heavy snow expected. Total snow accumulations 12 to 24 inches above 8000 feet and 6 to 18 inches between 6500 feet and 8000 feet. Winds gusting as high as 45 mph. * WHERE...Catalina and Rincon Mountains. * WHEN...From 11 AM Friday to 11 AM MST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means heavy snow accumulations are expected. Gusty winds and blowing snow are also possible. This will make travel very difficult or impossible...especially in the mountains. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ AZZ512-513-312300- /O.CON.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 310 AM MST Fri Dec 31 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
158 WWUS45 KTWC 312124 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 224 PM MST Fri Dec 31 2021 AZZ510-511-514-011200- /O.CON.KTWC.WS.W.0002.000000T0000Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Galiuro and Pinaleno Mountains-Catalina and Rincon Mountains- Including the cities of Hannagan Meadow, Mount Graham, Mount Lemmon, and Summerhaven 224 PM MST Fri Dec 31 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST SATURDAY... * WHAT...Heavy snow expected into early Saturday. Total snow accumulations 10 to 20 inches above 8000 feet and 4 to 16 inches between 6500 feet and 8000 feet. Winds gusting as high as 45 mph. * WHERE...Catalina and Rincon Mountains. * WHEN...Through 11 AM MST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means heavy snow accumulations are expected. Gusty winds and blowing snow are also possible. This will make travel very difficult or impossible...especially in the mountains. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ AZZ512-513-011200- /O.CON.KTWC.WW.Y.0006.000000T0000Z-220101T1800Z/ Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including the cities of Chiricahua NM and Canelo Hills 224 PM MST Fri Dec 31 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST SATURDAY... * WHAT...Heavy snow expected into early Saturday. Total snow accumulations 4 to 10 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. && $$ Cerniglia Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
202 WWUS45 KTWC 011011 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 311 AM MST Sat Jan 1 2022 AZZ510-511-514-011800- /O.CON.KTWC.WS.W.0002.000000T0000Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Galiuro and Pinaleno Mountains-Catalina and Rincon Mountains- Including the cities of Hannagan Meadow, Mount Graham, Mount Lemmon, and Summerhaven 311 AM MST Sat Jan 1 2022 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING... * WHAT...Heavy snow at time this morning before ending this afternoon. Total snow accumulations 10 to 20 inches above 8000 feet and 4 to 16 inches between 6500 feet and 8000 feet. Winds gusting as high as 45 mph. * WHERE...Catalina and Rincon Mountains. * WHEN...Through 11 AM MST Saturday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning means heavy snow accumulations are expected. Gusty winds and blowing snow are also possible. This will make travel very difficult or impossible...especially in the mountains. Stay tuned to NOAA Weather Radio...commercial television or radio stations...or your cable television service provider for updates on this Winter Storm. && $$ AZZ512-513-011800- /O.CON.KTWC.WW.Y.0006.000000T0000Z-220101T1800Z/ Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including the cities of Chiricahua NM and Canelo Hills 311 AM MST Sat Jan 1 2022 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING... * WHAT...Heavy snow at times this morning before ending this afternoon. Total snow accumulations 4 to 10 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...Through 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. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
606 WWUS45 KTWC 011758 WSWTWC URGENT - WINTER WEATHER MESSAGE National Weather Service Tucson AZ 1058 AM MST Sat Jan 1 2022 AZZ510-511-514-011900- /O.EXP.KTWC.WS.W.0002.000000T0000Z-220101T1800Z/ White Mountains of Graham and Greenlee Counties- Galiuro and Pinaleno Mountains-Catalina and Rincon Mountains- Including the cities of Hannagan Meadow, Mount Graham, Mount Lemmon, and Summerhaven 1058 AM MST Sat Jan 1 2022 ...WINTER STORM WARNING WILL EXPIRE AT 11 AM MST THIS MORNING... $$ AZZ512-513-011900- /O.EXP.KTWC.WW.Y.0006.000000T0000Z-220101T1800Z/ Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including the cities of Chiricahua NM and Canelo Hills 1058 AM MST Sat Jan 1 2022 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 11 AM MST THIS MORNING... $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
The office that day
Everything else NWS Tucson, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 30, 2:25 PM MST | Winter Weather Advisory | TWC | Cochise, Pima, Santa Cruz | 45 hr |
Nearby
Winter Storm Warnings in Arizona, 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.