Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 55, NWS Flagstaff, AZ

July 19, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 19, 2021, 4:27 PM MST for Yavapai County, Arizona. It was in force for 2 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 19, 2021, 4:27 PM MST (23:27 UTC)
Expired: Jul 19, 2021, 6:30 PM MST
In force: 2 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), 143 km from the middle of the area, began a volume at 23:31 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, 11.5 hours before the alert went out and 117 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: 480 J/kg
Mixed-layer CIN: -156 J/kg
Mixed-layer LCL: 1859 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

592 
WGUS55 KFGZ 192327
FFWFGZ
AZC025-200130-
/O.NEW.KFGZ.FF.W.0055.210719T2327Z-210720T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
427 PM MST Mon Jul 19 2021

The National Weather Service in Flagstaff has issued a

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

* Until 630 PM MST.

* At 425 PM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area, from the northern half of the 
  Tenderfoot Fire scar, to Peeples Valley. Between 1 and 2 inches of 
  rain have fallen. Additional rainfall amounts of 0.25 to 0.75 
  inches are possible in the warned area. 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...
  Peeples Valley.

This includes the following highways...
	State Route 89 between mile markers 279 and 285.

This includes the following streams and drainages...
  Miller Creek, Poplar Wash, Arrastre Creek, Model Creek and 
  Kirkland Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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


&&

LAT...LON 3422 11272 3427 11278 3434 11277 3432 11268
      3432 11267 3424 11267

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

$$

JJ

2 follow-up statements

847 
WGUS75 KFGZ 200041
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
541 PM MST Mon Jul 19 2021

AZC025-200130-
/O.CON.KFGZ.FF.W.0055.000000T0000Z-210720T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
541 PM MST Mon Jul 19 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST THIS 
EVENING FOR YAVAPAI COUNTY...

At 539 PM MST, Doppler radar indicated thunderstorms producing heavy 
rain have ended across the warned area, from the northern half of 
the Tenderfoot Fire scar, to Peeples Valley. Between 1.50 and 2.50 
inches of rain have fallen. Light additional rainfall amounts up to 
0.25 inches are possible in the warned area. Flash flooding is 
ongoing.

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...
  Peeples Valley.

This includes the following highways...
	State Route 89 between mile markers 279 and 285.

This includes the following streams and drainages...
  Miller Creek, Poplar Wash, Arrastre Creek, Model Creek and 
  Kirkland Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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


&&

LAT...LON 3422 11272 3427 11278 3434 11277 3432 11268
      3432 11267 3424 11267

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

$$

TPS

497 
WGUS75 KFGZ 200128
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
628 PM MST Mon Jul 19 2021

AZC025-200138-
/O.EXP.KFGZ.FF.W.0055.000000T0000Z-210720T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
628 PM MST Mon Jul 19 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 630 PM MST THIS EVENING FOR 
YAVAPAI COUNTY...

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

LAT...LON 3422 11272 3427 11278 3434 11277 3432 11268
      3432 11267 3424 11267

$$

TPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 5:31 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	59 min
Jul 18, 5:43 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	24 min
Jul 18, 6:14 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 18, 6:21 PM MST	Special Weather Statement	FGZ		24 min
Jul 19, 1:48 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 19, 1:54 PM MST	Special Weather Statement	FGZ		51 min
Jul 19, 2:08 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	37 min
Jul 19, 2:30 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 19, 3:07 PM MST	Special Weather Statement	FGZ		23 min
Jul 19, 3:28 PM MST	Special Weather Statement	FGZ		32 min
Jul 19, 3:37 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 19, 4:01 PM MST	Flash Flood Warning Considerable damage threat	FGZ	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.