Alert archive / Arizona / Flash Flood Watches in 2020
Flash Flood Watch 2, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood watch at Mar 11, 2020, 3:59 AM MST for 5 counties in Arizona; Imperial County, Riverside County, San Bernardino County, California. It took effect at Mar 12, 2020, 11:00 AM MST. It was in force for 33 hr.
The area
The counties it named.
The facts
- Issued
- Mar 11, 2020, 3:59 AM MST (10:59 UTC)
- In effect from
- Mar 12, 2020, 11:00 AM MST
- Expired
- Mar 13, 2020, 8:00 PM MST
- In force
- 33 hr
- Issued by
- NWS Phoenix, AZ
- Flood severity
- None
Counties Gila County, AZ, La Paz County, AZ, Maricopa County, AZ, Pinal County, AZ, Yuma County, AZ, Imperial County, CA, Riverside County, CA, San Bernardino County, CA
The radar
The Yuma radar (KYUX), 142 km from the middle of the area, began a volume at 11:02 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
Yuma Prvg Ground, AZ (K1Y7), launched 00:00Z, 11.0 hours before the alert went out and 128 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1704 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Phoenix, AZ wrote its last area forecast discussion before this flash flood watch went out at Mar 11, 3:46 AM MST, 13 minutes earlier.
Area forecast discussion, Mar 11, 3:46 AM MST, 13 minutes before
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</html>The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 7:04 PM MST | Areal Flood Advisory | PSR | Yuma | 4 hr |
| Mar 10, 8:39 PM MST | Areal Flood Advisory | PSR | La Paz | 4 hr |
| Mar 11, 10:06 AM MST | Areal Flood Warning | PSR | Gila | 5 days |
| Mar 10, 6:50 PM MST | Flash Flood Warning | PSR | Imperial | 4 hr |
| Mar 11, 6:25 AM MST | Dense Fog Advisory | PSR | Imperial | 4 hr |
Nearby
Flash Flood Watches in Arizona, 2020Flash Flood Watches in California, 2020Every flash flood watch in 2020
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.