Alert archive / Arizona / Snow Squall Warnings in 2020

Snow Squall Warning 2, NWS Flagstaff, AZ

March 13, 2020Coconino County, Navajo County, Arizona

NWS Flagstaff, AZ issued this snow squall warning at Mar 13, 2020, 4:57 PM MST for Coconino County, Navajo County, Arizona. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 13, 2020, 4:57 PM MST (23:57 UTC)
Expired
Mar 13, 2020, 5:45 PM MST
In force
48 min
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon

Counties Coconino County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 117 km from the middle of the area, began a volume at 23:57 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 12.0 hours before the alert went out and 81 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.

Skew-T log-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2020-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2020-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
-202 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 12, 11:43 PM MSTSpecial Weather StatementFGZ17 min
Mar 13, 3:17 AM MSTAreal Flood AdvisoryFGZCoconino, Gila, Navajo3 hr
Mar 13, 3:23 AM MSTSpecial Weather StatementFGZApache82 min
Mar 13, 7:00 AM MSTAreal Flood WarningFGZYavapai9 hr
Mar 13, 8:21 AM MSTRiver Flood WarningFGZYavapai3 hr
Mar 13, 12:18 PM MSTAreal Flood WarningFGZGila, Yavapai9 hr
Mar 13, 4:11 PM MSTSnow Squall WarningFGZCoconino34 min

Nearby

Snow Squall Warnings in Arizona, 2020Every snow squall warning in 2020

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.