Flash Flood Warning 198, NWS Flagstaff, AZ

Issued

Aug 17, 2021, 8:30 PM MST (03:30 UTC)

Expired

Aug 17, 2021, 10:30 PM MST

In force

2 hr

Issued by

NWS Flagstaff, AZ

Area

Storm-based polygon

Damage threat

Considerable

Flood severity

None

County Coconino County, AZ

The Cedar City radar (KICX), 165 km from the middle of the area, began a volume at 03:34 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.

334 
WGUS55 KFGZ 180330
FFWFGZ
AZC005-180530-
/O.NEW.KFGZ.FF.W.0198.210818T0330Z-210818T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
830 PM MST Tue Aug 17 2021

The National Weather Service in Flagstaff has issued a

* Flash Flood Warning for...
  Coconino County in north central Arizona...

* Until 1030 PM MST.

* At 826 PM MST, Doppler radar indicated areas of moderate rain 
  continuing across the warned area which includes much of the Grand 
  Canyon from Phantom Ranch all the way to the Mohave County line 
  north of Supai. Between 1 and 2 inches of rain have fallen over 
  much of this area this evening, with locally higher amounts near 3 
  inches. Additional rainfall amounts of 0.25 to 0.5 inches are 
  possible in the warned area. Flash flooding has been reported 
  along Bright Angel Creek near Phantom Ranch.

  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...
  Bright Angel Point, Cape Royal At Grand Canyon, Grand Canyon 
  National Park including Phantom Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for flooding even in locations not receiving rain. 
Normally dry washes, slot canyons and creeks can become raging 
killer currents in a matter of minutes, even from distant rainfall.

Get out of washes and creeks if you are camping or hiking! Flooding 
is occurring or imminent and will inundate area drainages.

&&

LAT...LON 3608 11185 3609 11220 3620 11244 3634 11268
      3638 11257 3632 11222 3631 11201 3625 11184
      3619 11180

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

$$

JJ

213 
WGUS75 KFGZ 180455
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
955 PM MST Tue Aug 17 2021

AZC005-180530-
/O.CON.KFGZ.FF.W.0198.000000T0000Z-210818T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
955 PM MST Tue Aug 17 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MST THIS 
EVENING FOR COCONINO COUNTY...

At 953 PM MST, Heavy rain has ended across the warned area which 
includes much of the Grand Canyon from Phantom Ranch west to the 
Mohave County line. Between 1 and 2 inches of rain fell earlier this 
evening. Flash flooding is likely ongoing in some locations.

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...
  Bright Angel Point, Cape Royal At Grand Canyon, Grand Canyon 
  National Park, Phantom Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Remain alert for flooding even in locations not receiving rain. 
Normally dry washes, slot canyons and creeks can become raging 
killer currents in a matter of minutes, even from distant rainfall.

Get out of washes and creeks if you are camping or hiking! Flooding 
is occurring or imminent and will inundate area drainages.

&&

LAT...LON 3608 11185 3609 11220 3620 11244 3634 11268
      3638 11257 3632 11222 3631 11201 3625 11184
      3619 11180

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

$$

JJ

147 
WGUS75 KFGZ 180528
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
1028 PM MST Tue Aug 17 2021

AZC005-180538-
/O.EXP.KFGZ.FF.W.0198.000000T0000Z-210818T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Coconino AZ-
1028 PM MST Tue Aug 17 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MST THIS EVENING FOR 
COCONINO COUNTY INCLUDING THE GRAND CANYON...

The heavy rain has ended over the Grand Canyon. Runoff will continue 
for a few more hours, but significant flooding is no longer expected 
to pose a threat.


LAT...LON 3608 11185 3609 11220 3620 11244 3634 11268
      3638 11257 3632 11222 3631 11201 3625 11184
      3619 11180

$$

JJ

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

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.