Alert archive / Arizona / Flash Flood Warnings in 2012

Flash Flood Warning 18, NWS Flagstaff, AZ

August 19, 2012Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 19, 2012, 1:02 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 outline as issued.

The facts

Issued: Aug 19, 2012, 1:02 PM MST (20:02 UTC)
Expired: Aug 19, 2012, 4:00 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 Cedar City radar (KICX), 160 km from the middle of the area, began a volume at 20:03 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, 8.0 hours before the alert went out and 174 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: 155 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 1712 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: -32 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

041 
WGUS55 KFGZ 192002
FFWFGZ
AZC005-192300-
/O.NEW.KFGZ.FF.W.0018.120819T2002Z-120819T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
102 PM MST SUN AUG 19 2012

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITIES OF...WATERHOLES CANYON...ANTELOPE CANYON
  NEAR SR 98...PAGE...

* UNTIL 400 PM MST

* AT 100 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAIN PRODUCING FLASH FLOODING OVER THE ANTELOPE CANYON BASIN.

LAT...LON 3692 11150 3697 11131 3651 11120 3647 11141

$$

RB

2 follow-up statements

151 
WGUS75 KFGZ 192143
FFSFGZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
243 PM MST SUN AUG 19 2012

AZC005-192300-
/O.CON.KFGZ.FF.W.0018.000000T0000Z-120819T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCONINO AZ-
243 PM MST SUN AUG 19 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM MST FOR NORTH
CENTRAL COCONINO COUNTY...

AT 235 PM MST...HEAVY RAIN HAS DIMINISHED OVER THE ANTELOPE CANYON 
BASIN THIS AFTERNOON. HOWEVER HIGH WATER LEVELS WILL LIKELY CONTINUE 
FOR THE NEXT FEW HOURS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WATERHOLES 
CANYON...ANTELOPE CANYON NEAR SR 98 AND LE CHEE.

LAT...LON 3692 11150 3697 11131 3651 11120 3647 11141

$$

RB

413 
WGUS75 KFGZ 192255
FFSFGZ

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
355 PM MST SUN AUG 19 2012

AZC005-192304-
/O.EXP.KFGZ.FF.W.0018.000000T0000Z-120819T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
COCONINO AZ-
355 PM MST SUN AUG 19 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM MST FOR ANTELOPE 
CANYON IN NORTH CENTRAL COCONINO COUNTY...

HEAVY RAIN OVER ANTELOPE CANYON HAS ABATED THIS AFTERNOON. HIGH 
WATER LEVELS WILL SLOWLY RECEDE THIS EVENING.

LAT...LON 3692 11150 3697 11131 3651 11120 3647 11141

$$

RB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 5:46 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Aug 19, 12:29 PM MST	Special Weather Statement	FGZ	Coconino	46 min
Aug 19, 2:31 PM MST	Areal Flood Advisory	FGZ	Navajo	3 hr
Aug 19, 2:37 PM MST	Special Weather Statement	FGZ		38 min
Aug 19, 3:11 PM MST	Areal Flood Advisory	FGZ	Coconino	6 hr

Nearby

Flash Flood Warnings in Arizona, 2012 Every flash flood warning in 2012

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.