Alert archive / Arizona / Flash Flood Warnings in 2017

Flash Flood Warning 49, NWS Flagstaff, AZ

July 21, 2017Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 21, 2017, 1:56 PM MST for Gila 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: Jul 21, 2017, 1:56 PM MST (20:56 UTC)
Expired: Jul 21, 2017, 5:00 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 84 km from the middle of the area, began a volume at 20:57 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, 8.9 hours before the alert went out and 108 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: 835 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1427 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 85 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

312 
WGUS55 KFGZ 212056
FFWFGZ
AZC007-220000-
/O.NEW.KFGZ.FF.W.0049.170721T2056Z-170722T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
156 PM MST FRI JUL 21 2017

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Gila County in east central Arizona...

* Until 500 PM MST

* At 155 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Radar estimates indicate up to 
  1.20 inches have fallen in the past hour. Flash flooding is 
  expected to begin shortly.

* Some locations that will experience flooding include...
  Reynolds Creek Group Campground and Rose Creek Campground. 

This includes State Route 288 between mile markers 275 and 279, and
between mile markers 281 and 290.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall will likely trigger life threatening flash floods and
debris flows in and near the Juniper fire scar. Some roadways will be
inundated or washed out. Rapidly flowing water or debris accumulation
may affect Highway 288. Locations impacted by this warning include
but are not limited to the Pocket Creek, Workman Creek, and Reynolds
Creek drainages as well as a large portion of State Highway 288 south
of Young.

&&

LAT...LON 3393 11090 3377 11084 3375 11097 3391 11100

$$

MCT

2 follow-up statements

067 
WGUS75 KFGZ 212155
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
255 PM MST FRI JUL 21 2017

AZC007-220000-
/O.CON.KFGZ.FF.W.0049.000000T0000Z-170722T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila-
255 PM MST FRI JUL 21 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM MST FOR
GILA COUNTY...

At 253 PM MST, Doppler radar indicated heavy rain has ended across 
the warned area. However, runoff from earlier heavy rain can still 
cause flash flooding.

Some locations that will experience flooding include...
Reynolds Creek Group Campground and Rose Creek Campground. 

This includes State Route 288 between mile markers 275 and 279, and
between mile markers 281 and 290.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall will likely trigger life threatening flash floods and
debris flows in and near the Juniper fire scar. Some roadways will be
inundated or washed out. Rapidly flowing water or debris accumulation
may affect Highway 288. Locations impacted by this warning include
but are not limited to the Pocket Creek, Workman Creek, and Reynolds
Creek drainages as well as a large portion of State Highway 288 south
of Young.

&&

LAT...LON 3393 11090 3377 11084 3375 11097 3391 11100

$$

MCT

320 
WGUS75 KFGZ 212352
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
452 PM MST FRI JUL 21 2017

AZC007-220001-
/O.EXP.KFGZ.FF.W.0049.000000T0000Z-170722T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gila-
452 PM MST FRI JUL 21 2017

...THE FLASH FLOOD WARNING FOR GILA COUNTY WILL EXPIRE AT 500 PM
MST...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat at this time. Please continue to heed any remaining road 
closures and do not drive through flooded roads.

LAT...LON 3393 11090 3377 11084 3375 11097 3391 11100

$$

MCT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 5:21 PM MST	Areal Flood Advisory	FGZ	Navajo	3 hr
Jul 21, 11:06 AM MST	Flash Flood Warning	FGZ	Coconino	3 hr
Jul 21, 11:42 AM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Jul 21, 12:29 PM MST	Areal Flood Advisory	FGZ	Gila, Navajo	5 hr
Jul 21, 1:34 PM MST	Flash Flood Warning	FGZ	Gila, Navajo	3 hr
Jul 21, 2:44 PM MST	Flash Flood Warning	FGZ	Yavapai	2 hr
Jul 21, 3:02 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	28 min
Jul 21, 3:26 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr

Nearby

Flash Flood Warnings in Arizona, 2017 Every flash flood warning in 2017

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.