Alert archive / Arizona / Snow Squall Warnings in 2021
Snow Squall Warning 2, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this snow squall warning at Mar 13, 2021, 2:53 PM MST for Coconino County, Arizona. It was in force for 22 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, 2:53 PM MST (21:53 UTC)
- Expired
- Mar 13, 2021, 3:15 PM MST
- In force
- 22 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 50 km from the middle of the area, began a volume at 21:57 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, 9.9 hours before the alert went out and 44 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.
305
WWUS55 KFGZ 132154
SQWFGZ
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Flagstaff AZ
253 PM MST Sat Mar 13 2021
AZC005-132215-
/O.NEW.KFGZ.SQ.W.0002.210313T2153Z-210313T2215Z/
Coconino-
253 PM MST Sat Mar 13 2021
The National Weather Service in Flagstaff has issued a
* Snow Squall Warning for...
Coconino County for I-17 near Munds Park in north central
Arizona...
* Until 315 PM MST.
* At 253 PM MST, a dangerous snow squall was located along a line
extending from 8 miles southeast of Walnut Canyon National Monument
to near Happy Jack, moving east at 25 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 17 between mile markers 311 and 333.
State Route 89A near mile marker 378, and between mile markers 385
and 393.
Locations impacted include...
Munds Park, Mountainaire, Cave Springs Campground, Sterling Fish
Hatchery and Pine Flat Campground.
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.
&&
LAT...LON 3480 11155 3480 11172 3508 11175 3509 11157
3477 11154 3477 11155
TIME...MOT...LOC 2153Z 273DEG 21KT 3508 11142 3469 11146
$$
ET1 follow-up statement
658
WWUS55 KFGZ 132210
SQWFGZ
Snow Squall Warning
National Weather Service Flagstaff AZ
310 PM MST Sat Mar 13 2021
AZC005-132220-
/O.EXP.KFGZ.SQ.W.0002.000000T0000Z-210313T2215Z/
Coconino-
310 PM MST Sat Mar 13 2021
...THE SNOW SQUALL WARNING FOR COCONINO COUNTY WILL EXPIRE AT 315 PM
MST...
The snow squall which prompted the warning has exited the area.
Therefore, the snow squall warning will be allowed to expire. Snow
and ice-covered roads will continue to make travel difficult.
LAT...LON 3480 11155 3480 11172 3508 11175 3509 11157
3477 11154 3477 11155
TIME...MOT...LOC 2210Z 273DEG 21KT 3508 11136 3469 11140
$$
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, 3:37 PM MST | Snow Squall Warning | FGZ | Coconino | 23 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.