Alert archive / Arizona / Flash Flood Watches in 2016

Flash Flood Watch 3, NWS Flagstaff, AZ

August 5, 2016Apache County, Coconino County, Navajo County, Arizona

NWS Flagstaff, AZ issued this flash flood watch at Aug 5, 2016, 9:48 AM MST for Apache County, Coconino County, Navajo County, Arizona. It took effect at Aug 5, 2016, 11:00 AM MST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Aug 5, 2016, 9:48 AM MST (16:48 UTC)
In effect from: Aug 5, 2016, 11:00 AM MST
Expired: Aug 5, 2016, 7:53 PM MST
In force: 9 hr
Issued by: NWS Flagstaff, AZ
Flood severity: None

Counties Apache County, AZ, Coconino County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 16:49 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, 4.8 hours before the alert went out and 121 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: 274 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 25 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 Aug 5, 4:03 AM MST, 5 hours 45 minutes earlier.

Area forecast discussion, Aug 5, 4:03 AM MST, 5 hours 45 minutes before

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Hazardous weather outlook, Aug 5, 7:08 AM MST, 2 hours 40 minutes before

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In the hours before

Local storm report, Aug 5, 6:35 AM MST, 3 hours 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
635 AM MST FRI AUG 5 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1100 PM     FLASH FLOOD      11 NW LEES FERRY        36.96N 111.76W
08/04/2016                   COCONINO           AZ   OTHER FEDERAL

            OBSERVED RISE IN THE PARIA GAUGE AT HWY 89
            (1.8' RISE ~745PM MST AUG 4) AND AT THE
            PARIA GAUGE AT LEE'S FERRY (4.2' RISE
            STARTING AT 415AM MST AUG 5). FLASH FLOOD
            LEVELS IN EXCESS OF 5' ESTIMATED IN THE AZ
            PORTION OF THE PARIA FROM 11PM AUG 4 THROUGH
            7AM AUG 5.

&&

NWS FLAGSTAFF AZ
IRIS SYSTEM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 5:22 PM MST	Flash Flood Warning	FGZ	Gila	3 hr
Aug 5, 10:27 AM MST	Special Weather Statement	FGZ		33 min
Aug 5, 10:49 AM MST	Flash Flood Warning	FGZ	Gila	3 hr
Aug 5, 12:54 PM MST	Areal Flood Advisory	FGZ	Navajo	2 hr
Aug 5, 1:19 PM MST	Areal Flood Advisory	FGZ	Navajo	3 hr
Aug 5, 2:22 PM MST	Special Weather Statement	FGZ	Yavapai	23 min
Aug 5, 2:54 PM MST	Flash Flood Warning	FGZ	Apache	2 hr
Aug 5, 3:25 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 5, 4:43 PM MST	Areal Flood Advisory	FGZ	Apache, Navajo	6 hr

Nearby

Flash Flood Watches in Arizona, 2016 Every flash flood watch in 2016

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.