Alert archive / Arizona / Freeze Warnings in 2021
Freeze Warning 1, NWS Tucson, AZ
NWS Tucson, AZ issued this freeze warning at Feb 28, 2021, 2:46 PM MST for Pima County, Pinal County, Arizona. It took effect at Mar 1, 2021, 2:00 AM MST. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 28, 2021, 2:46 PM MST (21:46 UTC)
- In effect from
- Mar 1, 2021, 2:00 AM MST
- Expired
- Mar 1, 2021, 9:00 AM MST
- In force
- 7 hr
- Issued by
- NWS Tucson, AZ
Counties Pima County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 88 km from the middle of the area, began a volume at 21:47 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, 9.8 hours before the alert went out and 73 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
- 3286 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- -119 m²/s²
- 0-3 km storm-relative helicity
- -29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
977 WWUS75 KTWC 282146 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 246 PM MST Sun Feb 28 2021 AZZ502-504-505-010600- /O.NEW.KTWC.FZ.W.0001.210301T0900Z-210301T1600Z/ Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County- Including the cities of Sells, Tucson, Green Valley, Marana, Vail, and Picacho Peak State Park 246 PM MST Sun Feb 28 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 9 AM MST MONDAY... * WHAT...Sub-freezing temperatures between 28 and 32 degrees are expected with very localized spots as cold as 25 degrees, especially near washes. * WHERE...Tohono O'odham Nation, Tucson Metro Area and South Central Pinal County. * WHEN...From 2 AM to 9 AM MST Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ AZZ503-507>513-010200- /O.CON.KTWC.WI.Y.0001.000000T0000Z-210301T0200Z/ Upper Santa Cruz River Valley/Altar Valley- Upper San Pedro River Valley- Eastern Cochise County below 5000 feet-Upper Gila River Valley- White Mountains of Graham and Greenlee Counties- Galiuro and Pinaleno Mountains-Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including the cities of Sierra Vista, Benson, Willcox, Clifton, Safford, Mount Graham, Chiricahua NM, Bisbee, and Canelo Hills 246 PM MST Sun Feb 28 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 7 PM MST THIS EVENING... * WHAT...West winds 25 to 35 mph with gusts up to 45 mph expected. * WHERE...Upper Santa Cruz River Valley/Altar Valley, Upper San Pedro River Valley, Eastern Cochise County below 5000 feet, Upper Gila River Valley, White Mountains of Graham and Greenlee Counties, Galiuro and Pinaleno Mountains, Chiricahua Mountains and Dragoon and Mule and Huachuca and Santa Rita Mountains. * WHEN...From noon today to 7 PM MST this evening. * IMPACTS...Gusty winds could blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. && $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson
1 follow-up statement
297 WWUS75 KTWC 010157 NPWTWC URGENT - WEATHER MESSAGE National Weather Service Tucson AZ 657 PM MST Sun Feb 28 2021 AZZ503-507>513-010300- /O.EXP.KTWC.WI.Y.0001.000000T0000Z-210301T0200Z/ Upper Santa Cruz River Valley/Altar Valley- Upper San Pedro River Valley- Eastern Cochise County below 5000 feet-Upper Gila River Valley- White Mountains of Graham and Greenlee Counties- Galiuro and Pinaleno Mountains-Chiricahua Mountains- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including the cities of Sierra Vista, Benson, Willcox, Clifton, Safford, Mount Graham, Chiricahua NM, Bisbee, and Canelo Hills 657 PM MST Sun Feb 28 2021 ...WIND ADVISORY WILL EXPIRE AT 7 PM MST THIS EVENING... Winds are now below advisory criteria, therefore the Wind Advisory will be allowed to expire. $$ AZZ502-504-505-011430- /O.CON.KTWC.FZ.W.0001.210301T0900Z-210301T1600Z/ Tohono O'odham Nation-Tucson Metro Area- South Central Pinal County- Including the cities of Sells, Tucson, Green Valley, Marana, Vail, and Picacho Peak State Park 657 PM MST Sun Feb 28 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 9 AM MST MONDAY... * WHAT...Sub-freezing temperatures between 28 and 32 degrees are expected with very localized spots as cold as 25 degrees, especially near washes. * WHERE...Tohono O'odham Nation, Tucson Metro Area and South Central Pinal County. * WHEN...From 2 AM to 9 AM MST Monday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$ 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 |
|---|---|---|---|---|
| Feb 28, 2:54 AM MST | Wind Advisory | TWC | Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz | 16 hr |
Nearby
Freeze Warnings in Arizona, 2021Every freeze 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.