Alert archive / California / Areal Flood Warnings in 2017
Areal Flood Warning 4, NWS San Diego, CA
NWS San Diego, CA issued this areal flood warning at Feb 17, 2017, 10:15 PM PST for Riverside County, San Bernardino County, California. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 17, 2017, 10:15 PM PST (06:15 UTC)
- Expired
- Feb 18, 2017, 7:15 AM PST
- In force
- 9 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
The radar
The Santa Ana Mts radar (KSOX), 152 km from the middle of the area, began a volume at 06:18 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 00:00Z, 6.3 hours before the alert went out and 195 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
- 14 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1020 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 307 m²/s²
- 0-3 km storm-relative helicity
- 383 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal 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 areal flood warning went out at Feb 17, 9:46 PM PST, 29 minutes earlier.
Area forecast discussion, Feb 17, 9:46 PM PST, 29 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
946 PM PST Fri Feb 17 2017
...A strong winter storm will continue to impact the region
through Saturday...
.SYNOPSIS...
A strong Pacific storm will continue to bring gusty winds,
flooding and mountain snow to the region through tonight. Winds
will decrease as heavy rain turns to showers tonight. Showers will
continue tonight through Sunday morning. Dry weather returns
Sunday, but a small chance of light rain is possible Monday
through Wednesday.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
A winter storm continues to bring areas of light to moderate
rainfall across the region this evening with snow above 6500 feet
in the local mountains.
Earlier this afternoon/evening, the storm brought strong winds
and widespread heavy rainfall to much of the region.
Wind gusts reached 84 mph at Burns Canyon, 70 mph at Crestline
Ridge, 67 mph at Laguna Beach, 60 mph at San Clemente Pier and 59
mph at North Island.
Greatest rainfall totals so far:
MT BALDY VILLAGE 3.96 inches
CRESTLINE RIDGE 3.68 inches
LAGUNA HILLS 2.73 inches
LAKE ARROWHEAD NW 2.34 inches
LOWER SILVERADO CYN 2.13 inches
The worst of the storm is over but areas of rain with embedded
showers will continue into early Sunday morning as the low slowly
moves southeast.
From previous discussion...
A ridge of high pressure will bring dry weather Sunday, but
our region will remain on the southern fringes of a stream of
moisture for several days. That will mean small chances of light
showers Monday through Wednesday. A trough of low pressure on
Wednesday will bring more winds. Dry weather appears to follow
Thursday heading into next weekend.
&&
.AVIATION...
180530Z...Variable BKN-OVC cloud bases will continue overnight as
occasional rain continues with snow above 6000 ft MSL. Bases will
mostly be 3000-5000 ft MSL with local bases 500-1000 ft MSL west of
the mountains and local vis 2-4 SM in precip and fog. Higher terrain
will be obscured in clouds/fog/precip. Winds will continue to
diminish overnight with local gusts 25-35 kt over higher terrain
through 15Z Sat. Showers will gradually become more scattered after
12Z Sat, then more isolated for 22Z Sat.
&&
.MARINE...
Winds have diminished considerably this evening and will be variable
mostly below 20 knots the rest of tonight and Saturday morning.
Winds will increase from the northwest after the center of the low
pressure moves east of the coastal waters late Saturday and Saturday
evening, but most gusts will be 30 knots or less. The large west
swell will continue, peaking at 17 feet/14 sec/270 degrees late
Saturday, with hazardous conditions for small craft continuing
through Sunday. Isolated thunderstorms are possible Saturday, with a
small potential of waterspouts. A Marine Weather Statement has been
issued for the thunderstorm potential, and a Small Craft Advisory
continues through Sunday for the combination of the high seas and
moderately strong winds.
&&
.BEACHES...
Swell and surf will build further tonight and Saturday and peak late
Saturday at 17 ft/14 seconds/270 deg, then lower gradually on
Sunday. This will result in very large and potentially damaging sets
of 15 ft by late Saturday. Some low-lying coastal areas could be at
risk of minor coastal flooding due to large surf and rainfall
runoff, though the high tides of only 4 to 4.5 feet will mitigate
this slightly. Powerful rip currents will accompany the high surf as
well. A High Surf Warning remains in effect through Sunday evening.
Surf will gradually lower during the day Sunday.
There is also a slight chance for thunderstorms at the beaches
Saturday.
&&
.SKYWARN...
Skywarn activation is requested.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Flash Flood Watch through Saturday afternoon 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 7 AM PST Saturday for Riverside
County Mountains-San Bernardino County Mountains.
High Surf Warning until 10 PM PST Sunday for Orange County
Coastal Areas-San Diego County Coastal Areas.
PZ...Small Craft Advisory until 10 PM PST Sunday for Coastal Waters
from San Mateo Point to the Mexican Border and out to 30 nm-
Waters from San Mateo point to the Mexican Border Extending
30 to 60 nm out including San Clemente Island.
&&
PUBLIC...PG
AVIATION/MARINE/BEACHES...MaxwellIn the hours before
Local storm report, Feb 17, 7:27 PM PST, 2 hours 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
727 PM PST FRI FEB 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0555 PM NON-TSTM WND DMG 3 NE SAN DIEGO 32.74N 117.11W
02/17/2017 SAN DIEGO CA BROADCAST MEDIA
*** 1 FATAL ***
TREE DOWN ON VEHICLE WITH ONE FATALITY ON
NORTHBOUND 15 NEAR INTERSTATE 805 IN CITY
HEIGHTS. .
&&
JMBLocal storm report, Feb 17, 8:02 PM PST, 2 hours 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
802 PM PST FRI FEB 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0645 PM NON-TSTM WND DMG 1 E SANTA ANA 33.74N 117.86W
02/17/2017 ORANGE CA LAW ENFORCEMENT
VERY LARGE TREE DOWN ON CARS AND IN ROADWAY
AT 800 E WAKEHAM AVENUE. .
&&
LJLocal storm report, Feb 17, 8:35 PM PST, 1 hour 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
835 PM PST FRI FEB 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0653 PM FLASH FLOOD 3 SE GARDEN GROVE 33.75N 117.93W
02/17/2017 ORANGE CA LAW ENFORCEMENT
MOBILE HOME COMPLEX FLOODING DUE TO
OVERFLOWING OF THE WINTERSBURG CHANNEL.
&&
LJLocal storm report, Feb 17, 9:09 PM PST, 1 hour 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
909 PM PST FRI FEB 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0815 PM FLASH FLOOD 9 ESE WRIGHTWOOD 34.31N 117.47W
02/17/2017 SAN BERNARDINO CA TRAINED SPOTTER
FIRE TRUCK FELL INTO SINKHOLE ON I-15 AND
INTERCHANGE HWY 138, AFTER LANE #5 COLLAPSED
DUE TO FLOODING. .
&&
JMBLocal storm report, Feb 17, 9:47 PM PST, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
947 PM PST FRI FEB 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0555 PM FLASH FLOOD 7 SW MOUNTAIN VIEW ACRE 34.43N 117.44W
02/17/2017 SAN BERNARDINO CA LAW ENFORCEMENT
LARGE SINK HOLE ON CHATEAU RD/CEDAR ST, JEEP
UNDERWATER IN SINKHOLE. .
&&
JMBLocal storm report, Feb 17, 10:00 PM PST, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
1000 PM PST FRI FEB 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0553 PM TSTM WND DMG LAGUNA BEACH 33.53N 117.76W
02/17/2017 ORANGE CA EMERGENCY MNGR
APPROX 20 TREES DOWNED FROM CONVECTIVE WINDS
IN LAGUNA BEACH.
&&
JMBThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 17, 4:51 PM PST | Severe Thunderstorm Warning | SGX | Orange | 54 min |
| Feb 17, 5:11 PM PST | Special Marine Warning | SGX | 94 min | |
| Feb 17, 5:12 PM PST | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino | 4 hr |
| Feb 17, 5:43 PM PST | Severe Thunderstorm Warning | SGX | San Diego | 62 min |
| Feb 17, 5:48 PM PST | Areal Flood Advisory | SGX | San Diego | 5 hr |
| Feb 17, 5:48 PM PST | Severe Thunderstorm Warning | SGX | Orange | 57 min |
| Feb 17, 6:21 PM PST | Flash Flood Warning | SGX | San Bernardino | 4 hr |
| Feb 17, 9:00 PM PST | Small Craft Advisory | SGX | 49 hr | |
| Feb 17, 10:50 PM PST | Areal Flood Advisory | SGX | Orange, Riverside, San Diego | 7 hr |
Nearby
Areal Flood Warnings in California, 2017Every areal 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.