Alert archive / Arizona / Dust Storm Warnings in 2021

Dust Storm Warning 8, NWS Tucson, AZ

July 21, 2021Pinal County, Arizona

NWS Tucson, AZ issued this dust storm warning at Jul 21, 2021, 3:01 PM MST for Pinal County, Arizona. It was in force for 32 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: Jul 21, 2021, 3:01 PM MST (22:01 UTC)
Expired: Jul 21, 2021, 3:33 PM MST
In force: 32 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 60 km from the middle of the area, began a volume at 22:04 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

Phoenix, AZ (KPSR), launched 12:00Z, 10.0 hours before the alert went out and 82 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 5 J/kg
Mixed-layer CIN: -244 J/kg
Mixed-layer LCL: 2438 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

161 
WWUS55 KTWC 212201
DSWTWC

BULLETIN - EAS ACTIVATION REQUESTED
Dust Storm Warning
National Weather Service Tucson AZ
301 PM MST Wed Jul 21 2021

AZC021-212245-
/O.NEW.KTWC.DS.W.0008.210721T2201Z-210721T2245Z/
Pinal-
301 PM MST Wed Jul 21 2021

The National Weather Service in Tucson has issued a

* Dust Storm Warning for...
  Southwestern Pinal County in southeastern Arizona...

* Until 345 PM MST.

* At 259 PM MST, strong thunderstorm outflows were pushing 
  areas of blowing dust toward I-10 northwest of Picacho Peak.

  HAZARD...Less than a quarter mile visibility with strong wind in 
           excess of 40 mph.

  SOURCE...Detected by National Weather Service meteorologists.

  IMPACT...Dangerous life-threatening travel.

* This includes the following highways...
   Interstate 10 between mile markers 206 and 218.
   Route 87 between mile markers 116 and 124.

Locations impacted include...
Eloy, Picacho, Chui-Chu, Picacho Peak State Park, Shopishk and East
Chui-Chu.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Dust storms lead to dangerous driving conditions with visibility
reduced to near zero. If driving, avoid dust storms if possible. If
caught in one, pull off the road, turn off your lights and keep your
foot off the brake.

&&

LAT...LON 3268 11132 3257 11174 3279 11183 3279 11178
      3276 11177 3276 11174 3273 11174 3273 11167
      3276 11161 3284 11154 3288 11148
TIME...MOT...LOC 2159Z 254DEG 49KT 3278 11135 

$$

Meyer

1 follow-up statement

495 
WWUS55 KTWC 212233
DSWTWC

Dust Storm Warning
National Weather Service Tucson AZ
333 PM MST Wed Jul 21 2021

AZC021-212242-
/O.CAN.KTWC.DS.W.0008.000000T0000Z-210721T2245Z/
Pinal-
333 PM MST Wed Jul 21 2021

...THE DUST STORM WARNING FOR SOUTHWESTERN PINAL COUNTY IS
CANCELLED...

The dust storm which prompted the warning has weakened and exited the
area. Therefore, the dust storm warning has been cancelled.

LAT...LON 3268 11132 3257 11174 3279 11183 3279 11178
      3276 11177 3276 11174 3273 11174 3273 11167
      3276 11161 3284 11154 3288 11148
TIME...MOT...LOC 2224Z 254DEG 49KT 3291 11082 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 6:00 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 20, 6:44 PM MST	Special Weather Statement	TWC		46 min
Jul 20, 7:17 PM MST	Special Weather Statement	TWC	Santa Cruz	43 min
Jul 20, 8:02 PM MST	Severe Thunderstorm Warning	TWC	Pinal	58 min
Jul 20, 8:14 PM MST	Special Weather Statement	TWC		61 min
Jul 20, 8:17 PM MST	Severe Thunderstorm Warning	TWC	Pima	58 min
Jul 20, 8:40 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 20, 8:46 PM MST	Severe Thunderstorm Warning	TWC	Pima	30 min
Jul 20, 9:13 PM MST	Special Weather Statement	TWC		62 min
Jul 20, 9:24 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	51 min
Jul 20, 9:42 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Jul 20, 9:53 PM MST	Severe Thunderstorm Warning	TWC	Pinal	52 min
Jul 21, 1:50 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	5 days
Jul 21, 8:18 AM MST	Blowing Dust Advisory	TWC	Pima, Pinal	8 hr
Jul 21, 1:00 PM MST	Special Weather Statement	TWC	Pima	45 min
Jul 21, 1:12 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 21, 1:38 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 21, 1:57 PM MST	Special Weather Statement	TWC	Pima	48 min
Jul 21, 2:09 PM MST	Special Weather Statement	TWC	Pima	51 min
Jul 21, 2:16 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 21, 2:21 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	84 min
Jul 21, 2:51 PM MST	Areal Flood Advisory	TWC	Pima	3 hr

Nearby

Dust Storm Warnings in Arizona, 2021 Every dust storm 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.