Alert archive / Arizona / Flash Flood Warnings in 2021

Flash Flood Warning 114, NWS Flagstaff, AZ

July 28, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 28, 2021, 11:46 AM 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, 11:46 AM MST (18:46 UTC)
Expired: Jul 28, 2021, 2:45 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), 114 km from the middle of the area, began a volume at 18:45 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, 6.8 hours before the alert went out and 103 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.

522 
WGUS55 KFGZ 281846
FFWFGZ
AZC025-282145-
/O.NEW.KFGZ.FF.W.0114.210728T1846Z-210728T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
1146 AM 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 245 PM MST.

* At 1145 AM MST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. 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...
  Wolf Creek Falls, Upper Wolf Creek Group Campground and Lower Wolf 
  Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 3450 11244 3449 11241 3445 11239 3442 11239
      3442 11243 3444 11246 3446 11247 3448 11246

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

$$

McCollum

3 follow-up statements

148 
WGUS75 KFGZ 281909
FFSFGZ

Flash Flood Statement
National Weather Service Flagstaff AZ
1209 PM MST Wed Jul 28 2021

AZC025-282145-
/O.CON.KFGZ.FF.W.0114.000000T0000Z-210728T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
1209 PM MST Wed Jul 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM MST THIS 
AFTERNOON FOR YAVAPAI COUNTY...

At 1208 PM MST, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 2 and 3 inches of rain 
have fallen. 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...
  Wolf Creek Falls, Upper Wolf Creek Group Campground and Lower Wolf 
  Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 3450 11244 3449 11241 3445 11239 3442 11239
      3442 11243 3444 11246 3446 11247 3448 11246

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

$$

McCollum

165 
WGUS75 KFGZ 282010
FFSFGZ

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

AZC025-282145-
/O.CON.KFGZ.FF.W.0114.000000T0000Z-210728T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
110 PM MST Wed Jul 28 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 PM MST THIS 
AFTERNOON FOR YAVAPAI COUNTY...

At 107 PM MST, Doppler radar indicated that heavy rain has ended 
across the warned area that include Wolf Creek Falls. Between 2.5 
and 3.5 inches of rain have fallen.

HAZARD...Thunderstorms producing flash flooding.

SOURCE...Radar.

IMPACT...Flash flooding of low-water crossings, creeks, normally
         dry washes and roads.

Some locations that will experience flash flooding include...
  Wolf Creek Falls, Upper Wolf Creek Group Campground and Lower Wolf 
  Creek Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to higher ground now. Act quickly to protect your life.

&&

LAT...LON 3450 11244 3449 11241 3445 11239 3442 11239
      3442 11243 3444 11246 3446 11247 3448 11246

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

$$

McCollum

693 
WGUS75 KFGZ 282139
FFSFGZ

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

AZC025-282149-
/O.EXP.KFGZ.FF.W.0114.000000T0000Z-210728T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yavapai AZ-
239 PM MST Wed Jul 28 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 245 PM MST THIS AFTERNOON FOR 
YAVAPAI COUNTY...

Heavy rain has ended in the area of Wolf Creek Falls and Wolf Creek 
Campground. Please heed any road closures and avoid driving over any 
water covered roads.

LAT...LON 3450 11244 3449 11241 3445 11239 3442 11239
      3442 11243 3444 11246 3446 11247 3448 11246

$$

McCollum

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, 3:07 PM 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.