Alert archive / California / Flash Flood Watches in 2007

Flash Flood Watch 10, NWS San Diego, CA

November 30, 20074 counties in California

NWS San Diego, CA issued this flash flood watch at Nov 30, 2007, 7:45 AM PST for 4 counties in California. It was in force for 19 hr.

The area

The counties it named.

The facts

Issued: Nov 30, 2007, 7:45 AM PST (15:45 UTC)
Expired: Dec 1, 2007, 3:04 AM PST
In force: 19 hr
Issued by: NWS San Diego, CA
Flood severity: None

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 15:48 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

San Diego, CA (KNKX), launched 12:00Z, 3.8 hours before the alert went out and 124 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: 1466 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 184 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 San Diego, CA wrote its last area forecast discussion before this flash flood watch went out at Nov 30, 2:15 AM PST, 5 hours 30 minutes earlier.

Area forecast discussion, Nov 30, 2:15 AM PST, 5 hours 30 minutes before

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Hazardous weather outlook, Nov 29, 4:00 PM PST, 15 hours 45 minutes before

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In the hours before

Special weather statement, Nov 30, 2:30 AM PST, 5 hours 15 minutes before

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Special weather statement, Nov 30, 2:30 AM PST, 5 hours 15 minutes before

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The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 30, 9:39 AM PST	Flash Flood Warning	SGX	San Diego	2 hr
Nov 30, 11:55 AM PST	Flash Flood Warning	SGX	San Diego	2 hr
Nov 30, 12:47 PM PST	Flash Flood Warning	SGX	San Diego	118 min
Nov 30, 1:10 PM PST	Flash Flood Warning	SGX	Orange	2 hr
Nov 30, 1:34 PM PST	Flash Flood Warning	SGX	San Bernardino	116 min
Nov 30, 3:30 PM PST	Flash Flood Warning	SGX	San Bernardino	2 hr

Nearby

Flash Flood Watches in California, 2007 Every flash flood watch in 2007

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.