Alert archive / Arizona / Mesoscale Discussions in 2010

Mesoscale Discussion 1925

October 5, 20105 counties in Arizona

The Storm Prediction Center issued this mesoscale discussion at Oct 5, 2010, 10:44 AM MST for 5 counties in Arizona. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Oct 5, 2010, 10:44 AM MST (17:44 UTC)
Expired: Oct 5, 2010, 1:15 PM MST
In force: 3 hr
Issued by: the Storm Prediction Center

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

The radar

The Phoenix radar (KIWA), 31 km from the middle of the area, began a volume at 17:46 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 watches that followed

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

Severe Thunderstorm Watch 691Oct 5, 11:55 AM MST

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 5.7 hours before the alert went out and 194 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: 118 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 304 m²/s²
0-3 km storm-relative helicity: 349 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

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
Oct 4, 5:33 PM MST	Mesoscale Discussion	SPC	Mohave	57 min
Oct 5, 11:52 AM MST	Severe Thunderstorm Watch	SPC	Gila, Maricopa, Pima, Pinal, Santa Cruz, Yavapai	7 hr
Oct 5, 3:16 PM MST	Mesoscale Discussion	SPC	Gila, Maricopa, Pima, Pinal, Santa Cruz, Yavapai	59 min

Nearby

Mesoscale Discussions in Arizona, 2010 Every mesoscale discussion in 2010

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.