Alert archive / California / River Flood Warnings in 2020

River Flood Warning 2, NWS San Diego, CA

April 10, 2020San Diego County, California

NWS San Diego, CA issued this river flood warning at Apr 10, 2020, 2:50 PM PDT for San Diego County, California. It was in force for 18 hr.

The area

The outline as issued.

The facts

Issued: Apr 10, 2020, 2:50 PM PDT (21:50 UTC)
Expired: Apr 11, 2020, 8:36 AM PDT
In force: 18 hr
Issued by: NWS San Diego, CA
Area: Storm-based polygon
Flood severity: Minor

County San Diego County, CA

The radar

The San Diego radar (KNKX), 51 km from the middle of the area, began a volume at 21:51 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 river

Written for the forecast point Santa Margarita River at Ysidora (YDRC1). The gauge peaked at 10.73 ft at Apr 10, 2020, 8:00 PM PDT.

Action stage: 10.85 ft
Minor stage: 12.5 ft
Moderate stage: 13.78 ft
Major stage: 16.29 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record for site 11046000, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

The text

As transmitted.

476 
WGUS46 KSGX 102150
FLWSGX
Bulletin - immediate broadcast requested
Flood Warning
National Weather Service San Diego, CA
250 PM PDT Fri Apr 10 2020

...The National Weather Service in San Diego has issued a flood 
warning for the following rivers in California... 

  Santa Margarita River at Ysidora affecting San Diego County

.Overview...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Safety message...

Act now to protect your life and property. Prepare for flood waters 
to rise across the warned area. Turn around...don't drown. Do not 
drive vehicles through flooded roadways.

&&

CAC073-111050-
/O.NEW.KSGX.FL.W.0002.200410T2153Z-200411T1536Z/
/YDRC1.1.ER.200410T2153Z.200410T2300Z.200411T0336Z.NO/
250 PM PDT Fri Apr 10 2020

The National Weather Service in san diego has issued a 

* Flood Warning for 
  the Santa Margarita River At Santa Margarita river at Ysidora
* At 2 PM Friday the stage was 10.3 feet
* No flooding is occurring. Minor flooding is forecast
* Flood stage is 11.2 feet
*  At 11.2 feet, Minor flood stage, 8,000 cfs. Vandegrift Road 
has begun to flood downstream of the gage. Stuart Mesa Road 
closures can be expected.

The next update will be issued at 9 PM PDT.

&&

LAT...LON 3325 11743 3341 11731 3337 11728 3326 11735
      3321 11740                  

$$

10

2 follow-up statements

428
WGUS86 KSGX 110501
FLSSGX
Flood Statement
National Weather Service San Diego, CA
1001 PM PDT Fri Apr 10 2020

...The flood warning continues for the following rivers in California...

San Diego River At Fashion Valley affecting San Diego County
Santa Margarita River At Santa Margarita river at Ysidora affecting San Diego
County
For the San Diego River, including Fashion Valley, Minor flooding is occuring
and is expected to continue. For the Santa Margarita River, including Santa
Margarita river at Ysidora, Minor flooding is forecasted.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay informed on the latest river forecasts and conditions. Do not drive through
flooded areas or around barricades.

CAC073-111520-
/O.EXT.KSGX.FL.W.0001.000000T0000Z-200411T1520Z/
/FSNC1.1.ER.200410T1654Z.200411T0207Z.200411T0920Z.NO/
1001 PM PDT Fri Apr 10 2020

The Flood Warning continues for
The San Diego River At Fashion Valley
* until after midnight tomorrow
* At 09PM Friday the stage was 12.1 feet
* Minor flooding is occurring and Minor flooding is forecast
* Flood stage is 11.3 feet
* At 11.3 feet, Flood stage. Minor Flood. Low water crossings over the river in
Mission Valley are closed and under water. Roads impacted include...Fashion
Valley Road, Avenida Del Rio, Camino Del Este, Camino De La Reina, and Mission
Center Road. Water flows into Fashion Valley parking lot. Fashion Valley transit
center closed.* Flood History...this crest compares to a previous crest of 12.2 feet on Feb 15
2019.

LAT...LON 3279 11726 3291 11690 3285 11686 3273 11716
3273 11727

CAC073-111801-
/O.EXT.KSGX.FL.W.0002.000000T0000Z-200411T2142Z/
/YDRC1.1.ER.200411T0457Z.200411T0600Z.200411T0942Z.NO/
1001 PM PDT Fri Apr 10 2020

The Flood Warning continues for
The Santa Margarita River At Santa Margarita river at Ysidora
* from tonight Until after midnight tomorrow
* At 09PM Friday the stage was 10.5 feet
* Minor flooding is forecast
* Flood stage is 11.2 feet
* At 11.2 feet, Minor flood stage, 8,000 cfs. Vandegrift Road has begun to
flood downstream of the gage. Stuart Mesa Road closures can be expected.* Flood History...this crest compares to a previous crest of 12.4 feet on Feb 23
1998.

LAT...LON 3325 11743 3341 11731 3337 11728 3326 11735
3321 11740

jmb

475 
WGUS86 KSGX 111206
FLSSGX
Flood Statement
National Weather Service San Diego, CA
506 AM PDT Sat Apr 11 2020

...The flood warning is cancelled for the following rivers in California...
 
  San Diego River At Fashion Valley affecting San Diego County
  
  Santa Margarita River At Santa Margarita river at Ysidora affecting San Diego
  County
  
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Stay informed on the latest river forecasts and conditions. Do not drive through
flooded areas or around barricades.

&&

CAC073-111236-
/O.CAN.KSGX.FL.W.0001.000000T0000Z-200411T1520Z/
/FSNC1.1.ER.200410T1654Z.200411T0207Z.200411T0913Z.NO/
506 AM PDT Sat Apr 11 2020

Forecast information for

  San Diego River At Fashion Valley
  
* At 4 AM Saturday the stage was 10.9 feet

* Although no signficant flooding is forecast, there will continue to be 
  flooding near the Fashion Valley Mall, including Fashion Valley Road, 
  Avenida Del Rio, and Camino Del Este.

* Flood stage is 11.3 feet

* Forecast...water levels will continue a steady fall throughout the day 
  and is forecast to fall below 8 feet by late this afternoon.

&&

LAT...LON 3279 11726 3291 11690 3285 11686 3273 11716
      3273 11727                  

$$

CAC073-111236-
/O.CAN.KSGX.FL.W.0002.000000T0000Z-200411T2142Z/
/YDRC1.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.NO/
506 AM PDT Sat Apr 11 2020

Forecast information for

  Santa Margarita River At Santa Margarita river at Ysidora
  
* At 4 AM Saturday the stage was 9.0 feet

* No flooding is currently forecast

* Flood stage is 11.2 feet

* Forecast...water levels will continue a steady fall throughout the day
  and is forecast to fall below 7 feet late this morning.

&&

LAT...LON 3325 11743 3341 11731 3337 11728 3326 11735
      3321 11740                  

$$

Gregoria

What forecasters said that day

The local office's own words before this river flood warning 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 river flood warning went out at Apr 10, 1:43 PM PDT, 1 hour 7 minutes earlier.

Area forecast discussion, Apr 10, 1:43 PM PDT, 1 hour 7 minutes before

Area Forecast Discussion
National Weather Service San Diego CA
143 PM PDT Fri Apr 10 2020

.SYNOPSIS...
Low pressure centered over the CA Bight this afternoon, will move
inland tonight, and out of the region on Saturday. Numerous rain and
snow showers will become more scattered this evening, and shift east
to the mountains and deserts overnight. For Saturday, partly cloudy
and warmer weather will develop, but lingering moisture and weak
disturbances from the north will keep a fair amount of clouds
around, and a small chance of showers, mainly over the mountains
Sunday and Monday. Fair and warmer by the middle of next week.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

No thunderstorms have been detected through 1 PM PDT. Widespread
rainfall totals nonetheless over the past 18 hours have been
impressive, ranging from 0.75-2.50 inches from southern O.C. and
Riverside Counties, and south over western San Diego County. Peak
amounts have topped 3 inches. Snow continues to fall in the
mountains. Storm rain/snow totals are periodically updated and
headlined on our webpage. The snow level varies, but is likely near
5500 FT with accumulations perhaps closer to 6K FT. An increase in
intensity is likely late today and this evening before tapering off.
A Winter Storm Warning remains in effect for the northern mountains,
and a Winter Weather Advisory is in effect for the San Diego County
Mts. Five-day snowfall reports in our northern mts ranged from 10 to
35 inches for this entire event.

The San Diego River has reached minor flood stage, and a Flood
Warning is in effect there, with a continued slow climb expected
through late afternoon before tapering off and falling late tonight.
Farther to the north, the Santa Margarita River is above Action
Stage and should peak just below flood stage on Camp Pendleton
today.

Low pressure was centered over the CA Bight at midday and will drift
slowly SE through this evening before turning inland over far NW MX
late tonight. The satellite view of this pinwheel of clouds at
midday is quite impressive as a jet streak swirls around the south
side. Moisture and instability circulating about the low will
progressively pull shower activity eastward into Sat morning before
ending. Isolated thunderstorms are still possible across the
forecast area into the evening with favorable dynamics and jet
position, but only marginal instability. a Flash Flood Watch remains
in effect through 8 PM PDT.

Scattered showers will continue through the evening, and overnight
in the southern mountains, but Saturday is still forecast to be
partly cloudy and a bit warmer. There is a chance for some light
precipitation to develop over and west of the mountains Sunday into
Monday as weak disturbances act on lingering moisture in the
atmosphere. Precip amounts, if any, should be light, with the best
chance of measurable amounts over the mountains.

After Monday, a dry northwest flow pattern sets in, with a ridge
just off the West Coast. Look for dry and warmer conditions to
prevail after Monday. This respite could last much of the week, but
the GFS/CMC/ECMWF models are trending wetter again toward the end of
next week as yet another closed low drops SE along the West Coast.

&&

.AVIATION...
102000Z...Coast/Valleys/Mountains...Heaviest SHRA will continue to
impact KCRQ/KSAN through early this evening. Expect cigs 1500-2500
feet MSL and vis to 1-4SM at times in the heavier rain. Expect
activity to become more scattered in nature after 02Z. For
KSNA/KONT/KSBD scattered light showers are still possible with
ceilings 2500-3500 ft MSL. Higher terrain will be obscured. Winds 5-
12 kts decreasing to around 5 kts after 00Z.

Deserts...Expect periods of -RA through this evening with ceilings
generally above 3500 ft MSL. The rain should end late tonight.

&&

.MARINE...
There is also a slight chance of thunderstorms through early this
evening. Otherwise, no hazardous marine weather is expected tonight
through Tuesday.

&&

.BEACHES...
There is a slight chance of thunderstorms through early this
evening. Please check with your local authorities on potential beach
closures.

&&

.HYDROLOGY...
A Flash Flood Watch continues across much of the area into this
evening. Expect isolated heavy showers to continue this evening due
to the incoming upper-low center and favorable jet position. Peak
rainfall rates of 1/2 inch/hour still possible with a PW near 0.80
inch. Isolated thunderstorms are still possible into early evening
as well. Additional rainfall of one-quarter to one inch is likely,
with isolated additional amounts over one inch in San Diego County.
possible in spots through this evening with lighter amounts after
midnight.

Widespread moderate runoff will continue into this evening due to
prior heavy, widespread rainfall accumulations, ongoing showers, and
saturated soils. Moderate flow in the area rivers will continue
today, with flooding on the San Diego in Mission Valley.

&&

.SKYWARN...
Skywarn activation is requested.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Winter Weather Advisory until 8 PM PDT this evening for San
     Diego County Mountains.

     Flash Flood Watch through this evening for Apple and Lucerne
     Valleys-Coachella Valley-Orange County Coastal Areas-Orange
     County Inland Areas-Riverside County Mountains-San
     Bernardino County Mountains-San Bernardino and Riverside
     County Valleys-The Inland Empire-San Diego County Coastal
     Areas-San Diego County Deserts-San Diego County Mountains-
     San Diego County Valleys-San Gorgonio Pass Near Banning-
     Santa Ana Mountains and Foothills.

     Winter Storm Warning until 8 PM PDT this evening for Riverside
     County Mountains-San Bernardino County Mountains.

PZ...NONE.

&&

PUBLIC/HYDROLOGY...10
AVIATION/MARINE/BEACHES...Moreland

In the hours before

Local storm report, Apr 10, 1:31 PM PDT, 1 hour 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
131 PM PDT FRI APR 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0121 PM     HEAVY RAIN       4 ENE JAMUL             32.73N 116.82W
04/10/2020  E1.00 INCH       SAN DIEGO          CA   DEPT OF HIGHWAYS

            BOULDER REPORTED IN ROAD. AREA GOT AROUND AN
            INCH OF RAIN IN 6 HOURS.

&&

CO

Local storm report, Apr 10, 2:04 PM PDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
204 PM PDT FRI APR 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0148 PM     HEAVY RAIN       1 ENE LA MESA           32.77N 117.00W
04/10/2020  E0.70 INCH       SAN DIEGO          CA   PUBLIC

            ROCKS AND MUD PARTIALLY BLOCKING ROAD.
            AROUND 0.70 INCHES OF RAIN FELL IN THAT AREA
            OVER 6 HOURS.

&&

CO

Local storm report, Apr 10, 2:09 PM PDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
209 PM PDT FRI APR 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0155 PM     FLOOD            2 SW BONSALL            33.26N 117.25W
04/10/2020                   SAN DIEGO          CA   DEPT OF HIGHWAYS

            A FEW INCHES OF WATER COVERING BOTH SIDES OF
            THE ROAD. 1.20-1.30 INCHES OF RAIN FELL IN 6
            HOURS.

&&

CO

Local storm report, Apr 10, 2:13 PM PDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
213 PM PDT FRI APR 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0130 PM     FLOOD            6 WSW TEMECULA          33.47N 117.26W
04/10/2020                   RIVERSIDE          CA   DEPT OF HIGHWAYS

            DE LUZ RD CLOSED FROM CAMARON RD TO THE
            COUNTY LINE DUE TO FLOODING.

&&

CO

Local storm report, Apr 10, 2:21 PM PDT, 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
221 PM PDT FRI APR 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0130 PM     HEAVY RAIN       4 WNW VALLEY CENTER     33.25N 117.10W
04/10/2020  E0.80 INCH       SAN DIEGO          CA   DEPT OF HIGHWAYS

            BOULDERS BLOCKING ROAD. AROUND 0.80 INCHES
            OF RAIN FELL OVER 6 HOURS.

&&

CO

Local storm report, Apr 10, 2:42 PM PDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
242 PM PDT FRI APR 10 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0218 PM     FLOOD            2 SE VISTA              33.17N 117.21W
04/10/2020                   SAN DIEGO          CA   DEPT OF HIGHWAYS

            ROADWAY IS FLOODED.

&&

CO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 11:54 PM PDT	Areal Flood Advisory	SGX	San Diego	8 hr
Apr 10, 3:19 AM PDT	Winter Weather Advisory	SGX	San Diego	17 hr
Apr 10, 3:54 AM PDT	Areal Flood Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	4 hr
Apr 10, 7:43 AM PDT	Areal Flood Advisory	SGX	Orange, Riverside, San Diego	3 hr
Apr 10, 8:34 AM PDT	Flash Flood Warning	SGX	San Diego	3 hr
Apr 10, 11:28 AM PDT	Areal Flood Advisory	SGX	Riverside, San Diego	3 hr
Apr 10, 2:29 PM PDT	Flash Flood Warning Considerable damage threat	SGX	Riverside, San Diego	5 hr
Apr 10, 3:37 PM PDT	Areal Flood Advisory	SGX	San Diego	6 hr

Nearby

River Flood Warnings in California, 2020 Every river flood warning 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; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.