Alert archive / Arizona / Flash Flood Warnings in 2013

Flash Flood Warning 26, NWS Flagstaff, AZ

August 2, 2013Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 2, 2013, 4:05 PM MST for Coconino County, Arizona. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 2, 2013, 4:05 PM MST (23:05 UTC)
Expired: Aug 2, 2013, 7:00 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 23:05 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, 11.1 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: 259 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 2286 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: -41 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 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 flash flood warning went out at Aug 2, 3:30 PM MST, 35 minutes earlier.

Area forecast discussion, Aug 2, 3:30 PM MST, 35 minutes before

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Hazardous weather outlook, Aug 2, 5:58 AM MST, 10 hours 7 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
558 AM MST FRI AUG 2 2013

AZZ004>018-037>040-030700-
KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY-
COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS-
NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY-
CHUSKA MOUNTAINS AND DEFIANCE PLATEAU-
LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-
LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY-
LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY-
WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS-
NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS-
OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA-
NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-
558 AM MST FRI AUG 2 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...
NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN
ARIZONA.

.DAY ONE...TODAY AND TONIGHT

AMPLE MOISTURE REMAINS OVER NORTHERN ARIZONA FOR ISOLATED TO
SCATTERED THUNDERSTORMS IN THE LATE MORNING THROUGH EVENING.
THUNDERSTORMS WILL BE MOST PREVALENT IN NORTHEAST AND EAST CENTRAL
ARIZONA WITH LESS COVERAGE IN WESTERN COCONINO COUNTY AND WESTERN
YAVAPAI COUNTY. WEAK STEERING FLOW WILL RESULT IN SLOW MOVING
THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAINFALL. LOCALIZED
FLOODING WILL BE POSSIBLE WITH ANY PERSISTENT STORMS...AS WELL AS
HAIL AND DANGEROUS LIGHTNING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

MONSOON MOISTURE WILL REMAIN OVER NORTHERN ARIZONA RESULTING IN
ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS EACH DAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, Aug 2, 12:20 PM MST, 3 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1220 PM MST FRI AUG 02 2013

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

0500 PM     FLASH FLOOD      5 SE PAGE               36.85N 111.39W
08/01/2013                   COCONINO           AZ   PARK SERVICE

            FLASH FLOODING REPORTED IN ANTELOPE CANYON

&&

EVENT NUMBER FGZ1300065

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 12:56 PM MST	Areal Flood Advisory	FGZ	Navajo	2 hr
Aug 2, 1:56 PM MST	Areal Flood Advisory	FGZ	Coconino	2 hr
Aug 2, 3:12 PM MST	Flash Flood Warning	FGZ	Coconino, Navajo	3 hr
Aug 2, 3:25 PM MST	Flash Flood Warning	FGZ	Gila, Navajo	3 hr

Nearby

Flash Flood Warnings in Arizona, 2013 Every flash flood warning in 2013

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.