Alert archive / California / Flash Flood Warnings in 2017

Flash Flood Warning 2, NWS San Diego, CA

January 20, 2017San Diego County, California

NWS San Diego, CA issued this flash flood warning at Jan 20, 2017, 2:38 PM PST for San Diego County, California. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jan 20, 2017, 2:38 PM PST (22:38 UTC)
Expired: Jan 20, 2017, 5:30 PM PST
In force: 3 hr
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Flood severity: None

County San Diego County, CA

The radar

The San Diego radar (KNKX), 52 km from the middle of the area, began a volume at 22:41 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.

What was reported inside it

Time	Report	Where	Remark
Jan 20, 3:48 PM PST	FLASH FLOOD	6 Ese Rainbow, CA	3 FOOT BY 3 FOOT BOULDER IN EAST BOUND LANES OF SR76 NEAR PALA.
Jan 20, 4:20 PM PST	FLOOD	5 N Fallbrook, CA	BRIDGE FLOODED, VEHICLE IN JEOPARDY OF BEING WHISKED OFF BRIDGE NEAR SANDIA CREEK DRIVE AND ROCK MOUNTAIN ROAD .

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

San Diego, CA (KNKX), launched 12:00Z, 10.6 hours before the alert went out and 63 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: 41 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 133 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

068 
WGUS56 KSGX 202238
FFWSGX
CAC073-210130-
/O.NEW.KSGX.FF.W.0002.170120T2238Z-170121T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
238 PM PST FRI JAN 20 2017

The National Weather Service in San Diego has issued a

* Flash Flood Warning for...
  Northwestern San Diego County in southwestern California...

* Until 530 PM PST

* At 236 PM PST, Doppler radar indicated excessive rainfall across
  the warned area. Flash flooding is likely ongoing or will begin
  shortly.

* Some locations that will likely experience flooding include...
  Oceanside, Fallbrook, Valley Center, Vista, eastern Camp Pendleton,
  Camp Pendleton South, Camp Pendleton North, Palomar Mountain,
  Palomar Mountain State Park, S7 - East Grade Rd, San Marcos,
  Bonsall, Rincon Indian Reservation, Pala Indian Reservation and La
  Jolla Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around don't drown.

&&

LAT...LON 3346 11727 3345 11724 3343 11724 3343 11685
      3327 11679 3316 11739 3326 11748

$$

Albright

1 follow-up statement

809 
WGUS76 KSGX 202308
FFSSGX

Flash Flood Statement
National Weather Service San Diego CA
308 PM PST FRI JAN 20 2017

CAC073-210130-
/O.CON.KSGX.FF.W.0002.000000T0000Z-170121T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Diego CA-
308 PM PST FRI JAN 20 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM PST FOR
NORTHWESTERN SAN DIEGO COUNTY...

At 303 PM PST, Heavy runoff form early storms will continue, and
combine with additional heavy rain to produce flash flooding across
the warned area. Remember to turn around don't drown.

Some locations that will likely experience flooding include...
Oceanside, Fallbrook, Valley Center, Vista, Camp Pendleton, Palomar
Mountain, San Marcos, Bonsall, Rincon Indian Reservation, Pala
Indian Reservation and La Jolla Indian Reservation.

LAT...LON 3346 11727 3345 11724 3343 11724 3343 11685
      3327 11679 3316 11739 3326 11748

$$

Albright

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 20, 7:56 AM PST	Beach Hazards Statement	SGX	Orange, San Diego	12 hr
Jan 20, 10:41 AM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Diego	9 hr
Jan 20, 11:46 AM PST	Areal Flood Advisory	SGX	San Bernardino	8 hr
Jan 20, 12:38 PM PST	Severe Thunderstorm Warning	SGX	Orange	22 min
Jan 20, 12:46 PM PST	Areal Flood Advisory	SGX	San Diego	8 hr
Jan 20, 12:52 PM PST	Severe Thunderstorm Warning	SGX	Orange	23 min
Jan 20, 1:20 PM PST	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino	6 hr
Jan 20, 1:33 PM PST	Flash Flood Warning	SGX	San Bernardino	5 hr
Jan 20, 1:51 PM PST	Severe Thunderstorm Warning	SGX	San Diego	54 min
Jan 20, 2:03 PM PST	Areal Flood Advisory	SGX	Riverside, San Bernardino	5 hr
Jan 20, 2:25 PM PST	Severe Thunderstorm Warning	SGX	San Diego	50 min
Jan 20, 2:59 PM PST	Flash Flood Warning	SGX	San Diego	6 hr

Nearby

Flash Flood Warnings in California, 2017 Every flash flood warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.