Alert archive / Arizona / Flash Flood Watches in 2015

Flash Flood Watch 2, NWS Flagstaff, AZ

July 17, 2015Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood watch at Jul 17, 2015, 1:19 PM MST for Coconino County, Arizona. It took effect at Jul 18, 2015, 5:00 AM MST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Jul 17, 2015, 1:19 PM MST (20:19 UTC)
In effect from: Jul 18, 2015, 5:00 AM MST
Expired: Jul 18, 2015, 11:00 PM MST
In force: 18 hr
Issued by: NWS Flagstaff, AZ

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 20:19 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 12:00Z, 8.3 hours before the alert went out and 268 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: 345 J/kg
Mixed-layer CIN: -247 J/kg
Mixed-layer LCL: 2222 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 17, 9:45 AM MST, 3 hours 34 minutes earlier.

Area forecast discussion, Jul 17, 9:45 AM MST, 3 hours 34 minutes before

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Hazardous weather outlook, Jul 17, 3:39 AM MST, 9 hours 40 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 17, 1:30 PM MST	Special Weather Statement	FGZ		15 min
Jul 17, 2:09 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 17, 2:34 PM MST	Areal Flood Advisory	FGZ	Navajo	116 min

Nearby

Flash Flood Watches in Arizona, 2015 Every flash flood watch 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.