Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Tucson, AZ

January 25, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jan 25, 2021, 3:24 PM MST for Pima County, Arizona. It was in force for 36 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: Jan 25, 2021, 3:24 PM MST (22:24 UTC)
Expired: Jan 25, 2021, 4:00 PM MST
In force: 36 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 88 km from the middle of the area, began a volume at 22:25 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 12:00Z, 10.4 hours before the alert went out and 57 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 996 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

612 
WUUS55 KTWC 252224
SVRTWC
AZC019-252300-
/O.NEW.KTWC.SV.W.0002.210125T2224Z-210125T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
324 PM MST Mon Jan 25 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  North central Pima County in southeastern Arizona...

* Until 400 PM MST.

* At 322 PM MST, a severe thunderstorm was located 17 miles northeast
  of San Isidro, or 26 miles southwest of Marana, moving northeast 
  at 45 mph. This storm is displaying signs of rotation and is 
  capable of producing a brief weak tornado.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Three Points, Avra Valley, Tucson Estates, Valencia West, Saguaro
  National Park West, Picture Rocks, San Pedro, Queens Well, Santa
  Rosa Ranch, Silver Bell and Ryan AirField.

This includes Route 86 between mile markers 130 and 138, and between
mile markers 156 and 163.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3200 11166 3225 11178 3250 11132 3214 11111
TIME...MOT...LOC 2222Z 242DEG 40KT 3220 11154 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

RH

2 follow-up statements

631 
WWUS55 KTWC 252240
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
340 PM MST Mon Jan 25 2021

AZC019-252300-
/O.CON.KTWC.SV.W.0002.000000T0000Z-210125T2300Z/
Pima-
340 PM MST Mon Jan 25 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM MST
FOR NORTH CENTRAL PIMA COUNTY...

At 339 PM MST, a severe thunderstorm was located 8 miles south of
Avra Valley, or 13 miles southwest of Marana, moving northeast at 45
mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Avra Valley, Tucson Estates, Saguaro National Park West, Picture
Rocks, San Pedro, Queens Well and Silver Bell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3203 11163 3229 11171 3250 11132 3219 11115
TIME...MOT...LOC 2239Z 242DEG 40KT 3229 11134 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

RH

727 
WWUS55 KTWC 252253
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
353 PM MST Mon Jan 25 2021

AZC019-252302-
/O.EXP.KTWC.SV.W.0002.000000T0000Z-210125T2300Z/
Pima-
353 PM MST Mon Jan 25 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 400 PM MST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

LAT...LON 3203 11163 3229 11171 3250 11132 3219 11115
TIME...MOT...LOC 2252Z 242DEG 40KT 3234 11124 

$$

RH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 24, 5:05 PM MST	Special Weather Statement	TWC	Pinal	40 min
Jan 25, 1:47 PM MST	Special Weather Statement	TWC	Pima	43 min
Jan 25, 2:30 PM MST	Special Weather Statement	TWC	Pima, Pinal	45 min
Jan 25, 2:44 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Jan 25, 3:20 PM MST	Special Weather Statement	TWC	Pima	40 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every severe thunderstorm 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.