Alert archive / Arizona / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 119, NWS Flagstaff, AZ

October 18, 2015Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Oct 18, 2015, 10:37 PM MST for Coconino County, Arizona. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 18, 2015, 10:37 PM MST (05:37 UTC)
Expired: Oct 18, 2015, 11:00 PM MST
In force: 23 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 05:40 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 00:00Z, 5.6 hours before the alert went out and 68 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: 223 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1028 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 88 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 18, 9:25 PM MST, 1 hour 12 minutes earlier.

Area forecast discussion, Oct 18, 9:25 PM MST, 1 hour 12 minutes before

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Hazardous weather outlook, Oct 18, 9:34 PM MST, 1 hour 3 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 18, 8:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	36 min
Oct 18, 11:34 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	41 min
Oct 19, 12:01 AM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	29 min
Oct 19, 2:59 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	16 min
Oct 19, 3:15 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	30 min
Oct 19, 12:28 PM MST	Special Weather Statement	FGZ		32 min
Oct 19, 12:59 PM MST	Special Weather Statement	FGZ		31 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2015 Every severe thunderstorm warning 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.