Alert archive / California / Flash Flood Warnings in 2020
Flash Flood Warning 2, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Mar 12, 2020, 12:59 PM PDT for Riverside County, California. It was in force for 3 hr. 4 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
- Mar 12, 2020, 12:59 PM PDT (19:59 UTC)
- Expired
- Mar 12, 2020, 4:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Riverside County, CA
The radar
The San Diego radar (KNKX), 117 km from the middle of the area, began a volume at 20:01 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 |
|---|---|---|---|
| Mar 12, 1:01 PM PDT | HEAVY RAIN 0.5 | La Quinta, CA | HEAVY RAIN AND THUNDERSTORM. |
| Mar 12, 1:20 PM PDT | FLOOD | 5 Wnw Mecca, CA | FLOODED ROADS REPORTED BY HIGHWAY PATROL AND CALTRANS ON 62ND AVENUE AND POLK - HEAVY RAIN AND THUNDERSTORMS IN THE AREA WITH RATES OF 0.50 PER HOUR. |
| Mar 12, 2:00 PM PDT | FLOOD | 8 Nne Mecca, CA | CHP REPORTS FLOODING ON INTERSTATE 10 A FEW MILES WEST OF CACTUS CITY. |
| Mar 12, 2:35 PM PDT | FLASH FLOOD | 4 Ene Indio, CA | VEHICLE STUCK IN MUD ON DILLON RD. |
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, 8.0 hours before the alert went out and 136 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 968 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
691
WGUS56 KSGX 121959
FFWSGX
CAC065-122300-
/O.NEW.KSGX.FF.W.0002.200312T1959Z-200312T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
1259 PM PDT Thu Mar 12 2020
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
Riverside County in southern California...
* Until 400 PM PDT.
* At 1254 PM PDT, NWS weather radar indicated widespread rainfall
and isolated thunderstorms producing heavy rain in the lower
Coachella Valley. Storms are slowly moving northward. Rainfall
rates of 0.25 to 0.50 inches per hour are occurring. Thunderstorms
will produce up to 0.60 inches per hour. This will cause dangerous
flash flooding to creeks and low lying areas. Roadways will have
significant ponding of water. Interstate 10 could be affected by
flooding.
* Some locations that will experience flooding include...
Indio, Palm Springs, Coachella, southeastern Anza, Cathedral City,
Palm Desert, southeastern Desert Hot Springs, Rancho Mirage, Hwy 74
Between Anza And Palm Desert and Thermal.
LAT...LON 3352 11596 3352 11605 3350 11608 3345 11604
3344 11606 3345 11607 3342 11607 3343 11660
3382 11658 3398 11644 3395 11642 3392 11629
3392 11620 3386 11613 3382 11611 3375 11601
3374 11595 3355 11594
$$
Tardy1 follow-up statement
011
WGUS76 KSGX 122217
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
317 PM PDT Thu Mar 12 2020
CAC065-122300-
/O.CON.KSGX.FF.W.0002.000000T0000Z-200312T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riverside CA-
317 PM PDT Thu Mar 12 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR
RIVERSIDE COUNTY...
At 311 PM PDT, heavy rainfall continues near Indio but beginning to
taper off over the lower Coachella Valley. Significant flooding will
continue with runoff into the Whitewater river. Up to an inch of
rainfall has occurred in the valley and reports of flooded roads.
Some locations that will experience flooding include...
Indio, Palm Springs, Coachella, southeastern Anza, Cathedral City,
Palm Desert, southeastern Desert Hot Springs, Rancho Mirage, Hwy 74
Between Anza And Palm Desert and Thermal.
LAT...LON 3352 11596 3352 11605 3350 11608 3345 11604
3344 11606 3345 11607 3342 11607 3343 11660
3382 11658 3398 11644 3395 11642 3392 11629
3392 11620 3386 11613 3382 11611 3375 11601
3374 11595 3355 11594
$$
TardyThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 10:01 AM PDT | Areal Flood Advisory | SGX | Riverside, San Diego | 6 hr |
| Mar 12, 10:39 AM PDT | Areal Flood Advisory | SGX | Orange, Riverside, San Diego | 3 hr |
| Mar 12, 11:54 AM PDT | Flash Flood Warning | SGX | San Diego | 3 hr |
| Mar 12, 12:31 PM PDT | Areal Flood Advisory | SGX | Orange, Riverside, San Bernardino | 6 hr |
| Mar 12, 2:22 PM PDT | Flash Flood Warning | SGX | Orange, Riverside, San Bernardino | 3 hr |
| Mar 12, 2:50 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 5 hr |
| Mar 12, 3:43 PM PDT | Winter Weather Advisory | SGX | Riverside, San Bernardino | 17 hr |
| Mar 12, 4:51 PM PDT | Flash Flood Warning | SGX | San Bernardino | 3 hr |
Nearby
Flash Flood Warnings in California, 2020Every flash 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.