Alert archive / Arizona / Special Weather Statements in 2015

Special Weather Statement, NWS Phoenix, AZ

October 20, 2015

NWS Phoenix, AZ issued this special weather statement at Oct 20, 2015, 12:41 AM MST. It was in force for 49 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: Oct 20, 2015, 12:41 AM MST (07:41 UTC)
Expired: Oct 20, 2015, 1:30 AM MST
In force: 49 min
Issued by: NWS Phoenix, AZ

The radar

The Phoenix radar (KIWA), 73 km from the middle of the area, began a volume at 07:41 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, 7.7 hours before the alert went out and 149 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: 6 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1311 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

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

NWS Phoenix, AZ wrote its last area forecast discussion before this special weather statement went out at Oct 19, 9:55 PM MST, 2 hours 46 minutes earlier.

Area forecast discussion, Oct 19, 9:55 PM MST, 2 hours 46 minutes before

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In the hours before

Local storm report, Oct 19, 7:30 PM MST, 5 hours 11 minutes before

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Special weather statement, Oct 19, 9:05 PM MST, 3 hours 36 minutes before

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Special weather statement, Oct 19, 9:52 PM MST, 2 hours 49 minutes before

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Special weather statement, Oct 19, 11:23 PM MST, 1 hour 18 minutes before

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Special weather statement, Oct 20, 12:41 AM MST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 19, 5:05 PM MST	Special Weather Statement	PSR	Maricopa	40 min
Oct 19, 5:24 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	51 min
Oct 19, 9:05 PM MST	Special Weather Statement	PSR	Maricopa	40 min
Oct 19, 9:52 PM MST	Special Weather Statement	PSR		23 min
Oct 19, 11:23 PM MST	Special Weather Statement	PSR		52 min
Oct 20, 12:58 AM MST	Special Weather Statement	PSR	Maricopa	47 min
Oct 20, 1:06 AM MST	Special Weather Statement	PSR	La Paz	39 min
Oct 20, 1:32 AM MST	Special Weather Statement	PSR		43 min
Oct 20, 2:11 AM MST	Special Weather Statement	PSR		49 min
Oct 20, 3:02 AM MST	Special Weather Statement	PSR	Maricopa	43 min
Oct 20, 3:34 AM MST	Special Weather Statement	PSR		56 min
Oct 20, 3:36 AM MST	Special Weather Statement	PSR		54 min
Oct 20, 4:08 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	22 min
Oct 20, 4:21 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	39 min
Oct 20, 4:59 AM MST	Special Weather Statement	PSR		31 min
Oct 20, 5:38 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Oct 20, 7:50 AM MST	Areal Flood Advisory	PSR	La Paz, Maricopa, Yuma	3 hr
Oct 20, 8:30 AM MST	Areal Flood Advisory	PSR	Maricopa	60 min
Oct 20, 9:08 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Oct 20, 10:01 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Oct 20, 10:09 AM MST	Flash Flood Warning	PSR	Maricopa	96 min
Oct 20, 10:47 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	43 min
Oct 20, 11:23 AM MST	Flash Flood Warning	PSR	Maricopa	2 hr
Oct 20, 11:37 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Oct 20, 11:44 AM MST	Severe Thunderstorm Warning	PSR	Maricopa	46 min
Oct 20, 12:57 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	33 min
Oct 20, 3:33 PM MST	Special Weather Statement	PSR	La Paz	42 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.