Alert archive / Arizona / Flash Flood Watches in 2019

Flash Flood Watch 9, NWS Phoenix, AZ

November 26, 20195 counties in Arizona; Imperial County, Riverside County, California

NWS Phoenix, AZ issued this flash flood watch at Nov 26, 2019, 2:07 PM MST for 5 counties in Arizona; Imperial County, Riverside County, California. It took effect at Nov 28, 2019, 11:00 AM MST. It was in force for 30 hr.

The area

The counties it named.

The facts

Issued: Nov 26, 2019, 2:07 PM MST (21:07 UTC)
In effect from: Nov 28, 2019, 11:00 AM MST
Expired: Nov 29, 2019, 5:00 PM MST
In force: 30 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

The radar

The Yuma radar (KYUX), 149 km from the middle of the area, began a volume at 21:04 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, 9.1 hours before the alert went out and 258 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1109 m above ground
0-6 km bulk shear: 85 kt
0-1 km storm-relative helicity: -181 m²/s²
0-3 km storm-relative helicity: -18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Nov 26, 10:19 AM MST, 3 hours 48 minutes earlier.

Area forecast discussion, Nov 26, 10:19 AM MST, 3 hours 48 minutes before

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Nearby

Flash Flood Watches in Arizona, 2019 Flash Flood Watches in California, 2019 Every flash flood watch in 2019

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.