Alert archive / California / Flash Flood Warnings in 2019
Flash Flood Warning 29, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Sep 3, 2019, 3:32 PM PDT for San Diego County, California. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 3, 2019, 3:32 PM PDT (22:32 UTC)
- Expired
- Sep 3, 2019, 5:33 PM PDT
- In force
- 2 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), 66 km from the middle of the area, began a volume at 22:32 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 10.5 hours before the alert went out and 78 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
- 27 J/kg
- Mixed-layer CIN
- -503 J/kg
- Mixed-layer LCL
- 1584 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 15 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
421 WGUS56 KSGX 032232 FFWSGX CAC073-040130- /O.NEW.KSGX.FF.W.0029.190903T2232Z-190904T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service San Diego CA 332 PM PDT Tue Sep 3 2019 The National Weather Service in San Diego has issued a * Flash Flood Warning for... Southeastern San Diego County in southwestern California... * Until 630 PM PDT. * At 332 PM PDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is expected to begin shortly. Rainfall rates of 1 to 1.5 inches per hour are occurring between Pine Valley and Boulevard. * Some locations that will experience flooding include... I-8 Between Boulevard And Imperial County Line, southeastern Mount Laguna, I-8 Between Pine Valley And Boulevard, Boulevard, La Posta Indian Reservation, Live Oak Springs, Jacumba, Manzanita Indian Reservation, Campo Indian Reservation and Tierra Del Sol. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 3284 11649 3290 11638 3262 11614 3261 11633 $$ Moreland
2 follow-up statements
042 WGUS76 KSGX 032306 FFSSGX Flash Flood Statement National Weather Service San Diego CA 406 PM PDT Tue Sep 3 2019 CAC073-040130- /O.CON.KSGX.FF.W.0029.000000T0000Z-190904T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego CA- 406 PM PDT Tue Sep 3 2019 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM PDT FOR SOUTHEASTERN SAN DIEGO COUNTY... At 404 PM PDT, Doppler radar indicated that rainfall rates have begun to diminish across the warning area. However...flash flooding remains a concern. Some locations that will experience flooding include... I-8 Between Boulevard And Imperial County Line, southeastern Mount Laguna, I-8 Between Pine Valley And Boulevard, Boulevard, La Posta Indian Reservation, Live Oak Springs, Jacumba, Manzanita Indian Reservation, Campo Indian Reservation and Tierra Del Sol. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. && LAT...LON 3284 11649 3290 11638 3262 11614 3261 11633 $$ Moreland
483 WGUS76 KSGX 040033 FFSSGX Flash Flood Statement National Weather Service San Diego CA 533 PM PDT Tue Sep 3 2019 CAC073-040043- /O.CAN.KSGX.FF.W.0029.000000T0000Z-190904T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ San Diego CA- 533 PM PDT Tue Sep 3 2019 ...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SAN DIEGO COUNTY IS CANCELLED... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 3284 11649 3290 11638 3262 11614 3261 11633 $$ Moreland
What forecasters said that day
The local office's own words before this flash 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 flash flood warning went out at Sep 3, 2:15 PM PDT, 1 hour 17 minutes earlier.
Area forecast discussion, Sep 3, 2:15 PM PDT, 1 hour 17 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
215 PM PDT Tue Sep 3 2019
.SYNOPSIS...
High pressure over the southwest will bring hot, humid weather this
week with scattered afternoon showers and thunderstorms over the
mountains and deserts. The weather will turn cooler and less humid
this weekend as a trough of low pressure moves inland over the West
Coast.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
Cumulus development today was an hour later than on Monday, with the
first storms forming over the San Bernardino Mountains at 11:30 AM.
Baldwin Lake picked up 0.28" of rain through 1 PM. Weak winds aloft
are preventing these pulse storms from lasting too long, with the
rain shaft cutting off the storm updraft. Brief moderate rain is
likely with these cells through early evening as they drift slowly
north-northwest. Some storms may move into the high desert.
The hot and humid airmass that's been in place since the start of
the Labor Day weekend will be in place through Thursday. Wednesday
will probably be the hottest day this week when the 850 mb temps and
2-meter temperatures reach their peak. Easterly midlevel winds will
be stronger tomorrow too, and there may be some additional warming
from downslope flow into the Inland Valleys. Heat Risk impacts on
Wednesday will be greatest in the Inland Empire where high
temperatures will be 100-106, or about 10-12 degrees above average.
A Heat Advisory was issued for the Inland Empire Wednesday. Thursday
will also be another hot and humid day.
Ocean water temperatures at the coast today ranged from 71 at
Huntington Beach to 77.5 at Scripps Pier. This is a contributing
factor to the high humidity in the coastal zones.
Easterly flow around the base of a 595 dm high over the Four Corners
will continue to stream warm, humid air into the area through
Thursday. Precipitable water values of 1.20" to 1.40" in the
mountains combined with afternoon heating and surface convergence
with the afternoon sea breeze will trigger afternoon thunderstorms
over the mountains and deserts through Thursday. The stronger
easterly winds Wednesday may send some storms into the far eastern
valleys.
A pattern change will bring cooler, drier weather to Southern
California this weekend. A trough moving inland across northern
California Friday will deepen and dig south down the West Coast
Saturday and Sunday. Stronger onshore flow will spread cooling
inland, and the marine layer clouds will return to the coastal zones
and western valleys.
&&
.AVIATION...
032020Z...Coast...Mostly clear with SCT clouds around 20,000 ft
through this evening. Low clouds and fog will redevelop tonight
along the immediate coast, with bases around 400-500 ft MSL. Low
confidence in impacts at coastal TAF sites overnight. Any low clouds
that form will clear by 16Z Wednesday.
Valleys/Mountains/Deserts...Scattered showers and thunderstorms
continuing through 01Z, mainly over the mountains and the High
Desert. Storms that develop will have cloud bases around 9000 ft MSL
with tops up to 40,000 feet. Gusty outflow winds and heavy rain are
likely in these storms.
&&
.MARINE...
Patchy dense fog is possible over the waters tonight into Wednesday
morning. Areas of visibility 1 mile or less possible. Otherwise, no
hazardous marine weather is expected through Friday.
&&
.SKYWARN...
Skywarn was activated for San Bernardino and Riverside Counties
today for afternoon thunderstorms.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory from 11 AM to 8 PM PDT Wednesday for San
Bernardino and Riverside County Valleys-The Inland Empire.
PZ...NONE.
&&
PUBLIC...Moede
AVIATION/MARINE...ConnollyIn the hours before
Local storm report, Sep 3, 9:49 AM PDT, 5 hours 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
949 AM PDT TUE SEP 3 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0130 AM HEAVY RAIN 1 NW PALM SPRINGS 33.83N 116.51W
09/02/2019 M0.98 INCH RIVERSIDE CA ASOS
PALM SPRINGS AIRPORT ASOS RECORDED 0.98 INCH
OF RAIN BETWEEN 1:30 AM AND 5 AM ON 9/2. THE
HEAVIEST RAIN WAS BETWEEN 2 AM AND 3 AM.
&&
SCLocal storm report, Sep 3, 2:19 PM PDT, 1 hour 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
219 PM PDT TUE SEP 3 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 AM HEAVY RAIN 1 NNW PALM SPRINGS 33.83N 116.51W
09/02/2019 M0.98 INCH RIVERSIDE CA ASOS
0.98 INCHES OF RAIN 2 AM TO 5 AM. 0.70
INCHES BETWEEN 2 AM AND 3 AM PDT.
&&
AOTSpecial weather statement, Sep 3, 2:57 PM PDT, 35 minutes before
Special Weather Statement National Weather Service San Diego CA 257 PM PDT Tue Sep 3 2019 CAZ058-062-032245- San Diego County Mountains CA-San Diego County Deserts CA- 257 PM PDT Tue Sep 3 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SAN DIEGO COUNTY UNTIL 345 PM PDT... At 256 PM PDT, Doppler radar was tracking a strong thunderstorm near Hwy S2 Between Canebrake And Imperial County Line, or near Mount Laguna, moving southeast at 5 mph. Additional thunderstorms were intensifying near Live Oak Springs and Boulevard. Pea size hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Southeastern Mount Laguna, I-8 Between Boulevard And Imperial County Line, I-8 Between Pine Valley And Boulevard, Boulevard, La Posta Indian Reservation, Live Oak Springs, Manzanita Indian Reservation and Campo Indian Reservation. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && LAT...LON 3283 11649 3292 11642 3269 11619 3262 11632 TIME...MOT...LOC 2156Z 330DEG 6KT 3281 11639 Moreland
The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 12:59 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 3 hr |
| Sep 3, 1:10 PM PDT | Heat Advisory | SGX | Orange, Riverside, San Bernardino, San Diego | 55 hr |
| Sep 3, 2:57 PM PDT | Special Weather Statement | SGX | San Diego | 48 min |
| Sep 3, 3:11 PM PDT | Severe Thunderstorm Warning | SGX | San Diego | 49 min |
| Sep 3, 3:58 PM PDT | Areal Flood Advisory | SGX | Riverside, San Diego | 3 hr |
Nearby
Flash Flood Warnings in California, 2019Every flash flood warning 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.