Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 150, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Aug 6, 2021, 7:31 PM MST for Apache 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
- Aug 6, 2021, 7:31 PM MST (02:31 UTC)
- Expired
- Aug 6, 2021, 10:30 PM MST
- In force
- 3 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Apache County, AZ
The radar
The Flagstaff radar (KFSX), 160 km from the middle of the area, began a volume at 02:32 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 00:00Z, 2.5 hours before the alert went out and 232 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.
- Mixed-layer CAPE
- 49 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 2530 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
381
WGUS55 KFGZ 070231
FFWFGZ
AZC001-070530-
/O.NEW.KFGZ.FF.W.0150.210807T0231Z-210807T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Flagstaff AZ
731 PM MST Fri Aug 6 2021
The National Weather Service in Flagstaff has issued a
* Flash Flood Warning for...
Apache County in northeastern Arizona...
* Until 1030 PM MST.
* At 730 PM MST, Doppler radar indicated thunderstorms producing
heavy rain over areas already affected by heavy rain, south of
Concho and St Johns and west of Lyman Lake. 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...
Eastern St Johns, Lyman Lake State Park and Lyman Lake.
This includes the following highways...
State Route 61 between mile markers 378 and 381.
Highway 180 between mile markers 356 and 366.
Highway 180 191 between mile markers 373 and 385.
This includes the following streams and drainages...
Big Hollow Wash and portions of the Little Colorado River near St
Johns.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3458 10941 3455 10941 3449 10940 3439 10935
3431 10933 3426 10943 3427 10949 3430 10957
3435 10959 3442 10957 3447 10954 3455 10947
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
Peterson1 follow-up statement
684
WGUS75 KFGZ 070526
FFSFGZ
Flash Flood Statement
National Weather Service Flagstaff AZ
1026 PM MST Fri Aug 6 2021
AZC001-070536-
/O.EXP.KFGZ.FF.W.0150.000000T0000Z-210807T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Apache AZ-
1026 PM MST Fri Aug 6 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MST THIS EVENING FOR
APACHE COUNTY...
At 1025 PM MST, National Weather Service Doppler radar indicated
that rainfall had ended south of St Johns. No flooding reports were
received and the Flash Flood Warning will be allowed to expire.
Areas creeks, washes and streams are likely still running high.
Please continue to heed remaining road closures.
LAT...LON 3458 10941 3455 10941 3449 10940 3439 10935
3431 10933 3426 10943 3427 10949 3430 10957
3435 10959 3442 10957 3447 10954 3455 10947
$$
PetersonNearby
Flash Flood Warnings in Arizona, 2021Every 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.