Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 115, NWS Flagstaff, AZ

July 28, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 28, 2021, 3:07 PM MST for Yavapai 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 28, 2021, 3:07 PM MST (22:07 UTC)
Expired: Jul 28, 2021, 6:15 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 117 km from the middle of the area, began a volume at 22:09 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, 10.1 hours before the alert went out and 69 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: 395 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1065 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

540 
WGUS55 KFGZ 282207
FFWFGZ
AZC025-290115-
/O.NEW.KFGZ.FF.W.0115.210728T2207Z-210729T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
307 PM MST Wed Jul 28 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Yavapai County in west central Arizona...

* Until 615 PM MST.

* At 305 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain east of Paulden and near the headwaters of the Verde 
  River. Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Life-threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

  IMPACT...Life-threatening flash flooding of low-water
           crossings, creeks, normally dry washes and roads.

* Some locations that will experience flash flooding include...
  Paulden.

This includes the following highways...
	State Route 89 between mile markers 334 and 341.

This includes the following streams and drainages...
  Verde River, Granite Creek, Little Chino Valley, Hell Canyon, Big 
  Chino Wash and Williamson Valley Wash.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3493 11249 3495 11238 3490 11231 3482 11232
      3482 11241 3485 11249 3488 11251

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

Peterson

1 follow-up statement

681 
WGUS75 KFGZ 290106
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
606 PM MST Wed Jul 28 2021

AZC025-290116-
/O.EXP.KFGZ.FF.W.0115.000000T0000Z-210729T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
606 PM MST Wed Jul 28 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 615 PM MST THIS EVENING FOR 
YAVAPAI COUNTY...

The heavy rain threat has ended near Paulden. Flooding is no longer 
expected to pose a threat. Please continue to heed remaining road 
closures.

LAT...LON 3493 11249 3495 11238 3490 11231 3482 11232
      3482 11241 3485 11249 3488 11251

$$

TPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 7:28 PM MST	Special Weather Statement	FGZ		32 min
Jul 27, 8:06 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 28, 11:46 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 28, 3:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 28, 4:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr
Jul 28, 4:43 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	3 hr

Nearby

Flash Flood Warnings in Arizona, 2021 Every flash flood warning in 2021

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.