Alert archive / Arizona / Snow Squall Warnings in 2021
Snow Squall Warning 3, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this snow squall warning at Mar 13, 2021, 3:37 PM MST for Coconino County, Arizona. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 2021, 3:37 PM MST (22:37 UTC)
- Expired
- Mar 13, 2021, 4:00 PM MST
- In force
- 23 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 70 km from the middle of the area, began a volume at 22:38 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, 10.6 hours before the alert went out and 22 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
- 1041 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
351
WWUS55 KFGZ 132238
SQWFGZ
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Flagstaff AZ
337 PM MST Sat Mar 13 2021
AZC005-132300-
/O.NEW.KFGZ.SQ.W.0003.210313T2237Z-210313T2300Z/
Coconino-
337 PM MST Sat Mar 13 2021
The National Weather Service in Flagstaff has issued a
* Snow Squall Warning for...
Coconino County for I-17 from Munds Park north to the I-40
interchange in Flagstaff in north central Arizona...
* Until 400 PM MST.
* At 337 PM MST, a dangerous snow squall was located along a line
extending from near Flagstaff to near Sedona, moving southeast at
20 mph.
HAZARD...Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts up to 30 mph.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
*
This includes the following highways...
Interstate 40 between mile markers 195 and 197.
Interstate 17 between mile markers 321 and 339.
State Route 89A near mile marker 398.
Locations impacted include...
Flagstaff, Munds Park, Kachina Village and Mountainaire.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.
&&
LAT...LON 3518 11162 3491 11160 3493 11173 3519 11168
TIME...MOT...LOC 2237Z 301DEG 35KT 3514 11164 3489 11184
$$
ETThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 1:03 PM MST | Wind Advisory | FGZ | Apache, Navajo | 30 hr |
| Mar 13, 2:15 PM MST | Snow Squall Warning | FGZ | Coconino, Yavapai | 45 min |
| Mar 13, 2:53 PM MST | Snow Squall Warning | FGZ | Coconino | 22 min |
| Mar 13, 3:59 PM MST | Snow Squall Warning | FGZ | Coconino, Yavapai | 46 min |
| Mar 13, 4:46 PM MST | Snow Squall Warning | FGZ | Coconino, Yavapai | 29 min |
Nearby
Snow Squall Warnings in Arizona, 2021Every snow squall 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.