Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 1, NWS San Diego, CA
NWS San Diego, CA issued this flash flood warning at Jul 18, 2021, 6:44 PM PDT for San Bernardino County, California. It was in force for 31 min. 1 report 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
- Jul 18, 2021, 6:44 PM PDT (01:44 UTC)
- Expired
- Jul 18, 2021, 7:15 PM PDT
- In force
- 31 min
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County San Bernardino County, CA
The radar
The Santa Ana Mts radar (KSOX), 89 km from the middle of the area, began a volume at 01:47 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 |
|---|---|---|---|
| Jul 18, 7:00 PM PDT | HEAVY RAIN 1.6 | 2 Ese Big Bear City, CA | HEAVY RAIN FROM MONSOONAL THUNDERSTORMS WITH 1.60 INCHES OF RAIN MEASURED AT BIG BEAR CITY STATION, 0.29 INCHES OF WHICH FELL IN 5 MINUTES FROM 6:10 PM UNTIL 6:15 PM. |
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 00:00Z, 1.7 hours before the alert went out and 168 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
- 2265 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 88 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
728
WGUS56 KSGX 190144
FFWSGX
CAC071-190215-
/O.NEW.KSGX.FF.W.0001.210719T0144Z-210719T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Diego CA
644 PM PDT Sun Jul 18 2021
The National Weather Service in San Diego has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 715 PM PDT.
* At 644 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.75 and 1.25 inches of
rain have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Doppler radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Big Bear City, northern Onyx Summit, eastern Lucerne Valley, Big
Bear Lake, Baldwin Lake, Hwy 18 Between Baldwin Lake And Lucerne
Valley, Hwy 38 Between Onyx Summit And Sugarloaf, Woodlands and
Fawnskin.
Additional rainfall amounts of 0.25 to 0.5 inches are possible in
the warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3428 11702 3420 11682 3419 11663 3434 11667
3440 11697
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SS1 follow-up statement
023
WGUS76 KSGX 190213
FFSSGX
Flash Flood Statement
National Weather Service San Diego CA
713 PM PDT Sun Jul 18 2021
CAC071-190223-
/O.EXP.KSGX.FF.W.0001.000000T0000Z-210719T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
713 PM PDT Sun Jul 18 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM PDT THIS EVENING FOR
SAN BERNARDINO COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3428 11702 3420 11682 3419 11663 3434 11667
3440 11697
$$
SSThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 5:49 PM PDT | Special Weather Statement | SGX | San Diego | 41 min |
| Jul 18, 6:12 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 32 min |
| Jul 18, 6:38 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 52 min |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning in 2021
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.