Alert archive / Arizona / Freeze Warnings in 2021
Freeze Warning 7, NWS Phoenix, AZ
NWS Phoenix, AZ issued this freeze warning at Dec 17, 2021, 1:09 AM MST for Maricopa County, Arizona. It took effect at Dec 18, 2021, 2:00 AM MST. It was in force for 6 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
- Dec 17, 2021, 1:09 AM MST (08:09 UTC)
- In effect from
- Dec 18, 2021, 2:00 AM MST
- Expired
- Dec 18, 2021, 8:00 AM MST
- In force
- 6 hr
- Issued by
- NWS Phoenix, AZ
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 08:08 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 00:00Z, 8.2 hours before the alert went out and 198 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
- 1788 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
530 WWUS75 KPSR 170809 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 109 AM MST Fri Dec 17 2021 AZZ534-172300- /O.NEW.KPSR.FZ.W.0007.211218T0900Z-211218T1500Z/ Aguila Valley- Including the cities of Aguila, Gladden, and Wickenburg 109 AM MST Fri Dec 17 2021 ...FREEZE WARNING IN EFFECT FROM 2 AM TO 8 AM MST SATURDAY... * WHAT...Temperatures in the lower 30s expected. * WHERE...Aguila Valley. * WHEN...From 2 AM to 8 AM MST Saturday. * 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. && $$
3 follow-up statements
426 WWUS75 KPSR 172007 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 107 PM MST Fri Dec 17 2021 AZZ534-181100- /O.CON.KPSR.FZ.W.0007.211218T0900Z-211218T1500Z/ Aguila Valley- Including the cities of Aguila, Gladden, and Wickenburg 107 PM MST Fri Dec 17 2021 ...FREEZE WARNING REMAINS IN EFFECT FROM 2 AM TO 8 AM MST SATURDAY... * WHAT...Temperatures in the lower 30s expected. * WHERE...Aguila Valley. * WHEN...From 2 AM to 8 AM MST Saturday. * IMPACTS...Frost and freeze conditions will kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above- ground pipes to protect them from freezing. && $$
930 WWUS75 KPSR 180805 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 105 AM MST Sat Dec 18 2021 AZZ534-181500- /O.CON.KPSR.FZ.W.0007.211218T0900Z-211218T1500Z/ Aguila Valley- Including the cities of Aguila, Gladden, and Wickenburg 105 AM MST Sat Dec 18 2021 ...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM MST THIS MORNING... * WHAT...Temperatures in the lower 30s expected. * WHERE...Aguila Valley. * WHEN...Until 8 AM MST this morning. * 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. && $$
554 WWUS75 KPSR 181445 NPWPSR URGENT - WEATHER MESSAGE National Weather Service Phoenix AZ 745 AM MST Sat Dec 18 2021 AZZ534-181545- /O.EXP.KPSR.FZ.W.0007.000000T0000Z-211218T1500Z/ Aguila Valley- Including the cities of Aguila, Gladden, and Wickenburg 745 AM MST Sat Dec 18 2021 ...FREEZE WARNING WILL EXPIRE AT 8 AM MST THIS MORNING... The Freeze Warning for Aguila Valley will expire at 8 AM MST. $$
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.