Alert archive / Arizona / Mesoscale Discussions in 2008

Mesoscale Discussion 2184

August 28, 20085 counties in Arizona

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2008, 5:52 PM MST for 5 counties in Arizona. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Aug 28, 2008, 5:52 PM MST (00:52 UTC)
Expired: Aug 28, 2008, 7:45 PM MST
In force: 113 min
Issued by: the Storm Prediction Center

Counties Gila County, AZ, Graham County, AZ, Maricopa County, AZ, Pima County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 27 km from the middle of the area, began a volume at 00:54 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 00:00Z, 0.9 hours before the alert went out and 54 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: 2017 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1808 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.0

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 29, 3:46 PM MST	Mesoscale Discussion	SPC	Gila, La Paz, Maricopa, Pima, Pinal, Yavapai and 1 more	119 min
Aug 29, 4:55 PM MST	Severe Thunderstorm Watch	SPC	Gila, La Paz, Maricopa, Mohave, Pinal, Yavapai and 1 more	9 hr

Nearby

Mesoscale Discussions in Arizona, 2008 Every mesoscale discussion in 2008

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.