Alert archive / Arizona / Mesoscale Discussions in 2017

Mesoscale Discussion 1309

July 13, 2017Santa Cruz County, Arizona

The Storm Prediction Center issued this mesoscale discussion at Jul 13, 2017, 6:39 PM MST for Santa Cruz County, Arizona. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jul 13, 2017, 6:39 PM MST (01:39 UTC)
Expired: Jul 13, 2017, 8:15 PM MST
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

County Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 16 km from the middle of the area, began a volume at 01:38 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

Tuscon, AZ (KDMA), launched 00:00Z, 1.7 hours before the alert went out and 24 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: 757 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 2798 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -55 m²/s²
0-3 km storm-relative helicity: -41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 2:55 PM MST	Mesoscale Discussion	SPC	Cochise, Gila, Graham, Greenlee, Maricopa, Pima and 3 more	65 min
Jul 14, 4:35 PM MST	Severe Thunderstorm Watch	SPC	Maricopa, Pima, Pinal	4 hr

Nearby

Mesoscale Discussions in Arizona, 2017 Every mesoscale discussion in 2017

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.