Alert archive / Arizona / Special Weather Statements in 2015

Special Weather Statement, NWS Flagstaff, AZ

July 31, 2015

NWS Flagstaff, AZ issued this special weather statement at Jul 31, 2015, 12:21 PM MST. It was in force for 24 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: Jul 31, 2015, 12:21 PM MST (19:21 UTC)
Expired: Jul 31, 2015, 12:45 PM MST
In force: 24 min
Issued by: NWS Flagstaff, AZ

The radar

The Flagstaff radar (KFSX), 32 km from the middle of the area, began a volume at 19:23 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 7.4 hours before the alert went out and 95 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: 224 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1347 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 8 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 12:38 PM MST	Areal Flood Advisory	FGZ	Yavapai	112 min
Jul 31, 12:52 PM MST	Areal Flood Advisory	FGZ	Gila	113 min
Jul 31, 1:32 PM MST	Special Weather Statement	FGZ		28 min
Jul 31, 2:07 PM MST	Special Weather Statement	FGZ		23 min
Jul 31, 2:26 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 31, 4:50 PM MST	Areal Flood Advisory	FGZ	Navajo	115 min

Nearby

Special Weather Statements in Arizona, 2015 Every special weather statement in 2015

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.