Alert archive / Arizona / Mesoscale Discussions in 2007

Mesoscale Discussion 1773

August 16, 2007Maricopa County, Pinal County, Arizona

The Storm Prediction Center issued this mesoscale discussion at Aug 16, 2007, 3:42 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Aug 16, 2007, 3:42 PM MST (22:42 UTC)
Expired: Aug 16, 2007, 4:45 PM MST
In force: 63 min
Issued by: the Storm Prediction Center

Counties Maricopa County, AZ, Pinal County, AZ

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 609Aug 16, 3:55 PM MST

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.7 hours before the alert went out and 214 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: 230 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 1747 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 1 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 16, 4:07 PM MST	Severe Thunderstorm Watch	SPC	Maricopa, Pinal	3 hr

Nearby

Mesoscale Discussions in Arizona, 2007 Every mesoscale discussion in 2007

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.