Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 63, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Sep 4, 2012, 1:55 PM PDT for Riverside County, San Bernardino County, California. It was in force for 95 min. 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 4, 2012, 1:55 PM PDT (20:55 UTC)
- Expired
- Sep 4, 2012, 3:30 PM PDT
- In force
- 95 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
The radar
The Santa Ana Mts radar (KSOX), 151 km from the middle of the area, began a volume at 20:56 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 12:00Z, 8.9 hours before the alert went out and 177 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
- 2730 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
886
WGUS55 KPSR 042055
FFWPSR
CAC065-071-042230-
/O.NEW.KPSR.FF.W.0063.120904T2055Z-120904T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
155 PM PDT TUE SEP 4 2012
THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTH CENTRAL RIVERSIDE COUNTY IN SOUTHERN CALIFORNIA...
SOUTH CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA...
* UNTIL 330 PM PDT
* AT 150 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
VERY HEAVY RAIN FROM SLOW MOVING THUNDERSTORMS THAT WILL CAUSE
FLASH FLOODING. FLASH FLOODING IS EXPECTED ALONG THE UTAH TRAIL ROAD
AND NORTHERN PARK ENTRANCE TO JOSHUA TREE NATIONAL PARK.
* THE STORM PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING
WILL GENERALLY REMAIN OVER THE NORTHERN PORTIONS OF JOSHUA TREE
NATIONAL PARK WHILE MOVING TO THE NORTHEAST.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
CAMPERS...HIKERS...AND OFF ROAD VEHICLE RIDERS SEEK HIGHER GROUND
IMMEDIATELY. AVOID WASHES AND STREAMS. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATER OR WATER OF UNKNOWN DEPTH.
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
&&
LAT...LON 3411 11604 3409 11603 3408 11600 3404 11599
3403 11590 3402 11590 3391 11601 3400 11612
3412 11616
$$
NOLTE3 follow-up statements
961
WGUS75 KPSR 042116
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
216 PM PDT TUE SEP 4 2012
CAC065-071-042230-
/O.CON.KPSR.FF.W.0063.000000T0000Z-120904T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-SAN BERNARDINO CA-
216 PM PDT TUE SEP 4 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO AND NORTH CENTRAL RIVERSIDE COUNTIES...
AT 208 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
MONITOR AN AREA OF THUNDERSTORMS PRODUCING VERY HEAVY RAIN
THAT WILL CAUSE FLASH FLOODING.
THIS THUNDERSTORM WITH EXCESSIVE RAIN WAS OVER THE NORTHERN MOST
PORTIONS OF JOSHUA TREE NATIONAL PARK...NEAR THE UTAH TRAIL AND
LOOP ROADS. RUNOFF FROM HEAVY RAINFALL WILL IMPACT PARK ROADWAYS
AND TRAILS. RADAR ESTIMATES OVER 1.25 TO 1.50 INCHES OF RAIN HAS
FALLEN IN THE LAST HOUR.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
CAMPERS...HIKERS...AND OFF ROAD VEHICLE RIDERS SEEK HIGHER GROUND
IMMEDIATELY. AVOID WASHES AND STREAMS. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATER OR WATER OF UNKNOWN DEPTH.
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
&&
LAT...LON 3411 11604 3409 11603 3408 11600 3404 11599
3403 11590 3402 11590 3391 11601 3400 11612
3412 11616
$$
NOLTE602
WGUS75 KPSR 042206
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
306 PM PDT TUE SEP 4 2012
CAC065-071-042230-
/O.CON.KPSR.FF.W.0063.000000T0000Z-120904T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-SAN BERNARDINO CA-
306 PM PDT TUE SEP 4 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO AND NORTH CENTRAL RIVERSIDE COUNTIES...
AT 300 PM PDT...EARLIER THUNDERSTORMS PRODUCING VERY HEAVY RAIN ACROSS
PORTIONS OF JOSHUA TREE NATIONAL PARK HAS MOVED INTO MORE MOUNTAINOUS
PORTIONS OF THE PARK. HOWEVER...RUNOFF FROM EARLIER STORMS WILL
CONTINUE TO IMPACT PARK ROADWAYS AND TRAILS. RADAR ESTIMATES THAT ONE
QUARTER TO ONE HALF INCH OF RAIN FELL UNDER THE HEAVIEST THUNDERSTORM
CORES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
CAMPERS...HIKERS...AND OFF ROAD VEHICLE RIDERS SEEK HIGHER GROUND
IMMEDIATELY. AVOID WASHES AND STREAMS. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATER OR WATER OF UNKNOWN DEPTH.
&&
LAT...LON 3411 11604 3409 11603 3408 11600 3404 11599
3403 11590 3402 11590 3391 11601 3400 11612
3412 11616
$$
NOLTE696
WGUS75 KPSR 042225
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
325 PM PDT TUE SEP 4 2012
CAC065-071-042233-
/O.EXP.KPSR.FF.W.0063.000000T0000Z-120904T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-SAN BERNARDINO CA-
325 PM PDT TUE SEP 4 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 330 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO AND NORTH CENTRAL RIVERSIDE COUNTIES...
HEAVY RAINFALL HAS ENDED ACROSS THE NORTHERN PORTIONS OF JOSHUA
TREE NATIONAL PARK AND THE FLASH FLOODING THREAT HAS GENERALLY
DIMINISHED. RUNOFF FROM STRONG THUNDERSTORMS MAY CONTINUE TO IMPACT
PARK ROADWAYS AND TRAILS OVER THE NEXT FEW HOURS. MAKE THE SMART
CHOICE...TURN AROUND...DONT DROWN. AVOID DRIVING THROUGH WATER
COVERED ROADWAYS AND PATHS.
LAT...LON 3411 11604 3409 11603 3408 11600 3404 11599
3403 11590 3402 11590 3391 11601 3400 11612
3412 11616
$$
NOLTEThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 6:41 PM PDT | Areal Flood Advisory | PSR | Riverside | 3 hr |
| Sep 4, 1:45 PM PDT | Special Weather Statement | PSR | Riverside | 45 min |
| Sep 4, 2:42 PM PDT | Areal Flood Advisory | PSR | Riverside | 94 min |
| Sep 4, 2:54 PM PDT | Special Weather Statement | PSR | Riverside | 66 min |
| Sep 4, 3:18 PM PDT | Areal Flood Advisory | PSR | Riverside, San Bernardino | 80 min |
| Sep 4, 3:33 PM PDT | Special Weather Statement | PSR | Imperial | 57 min |
| Sep 4, 3:56 PM PDT | Blowing Dust Advisory | PSR | 2 hr | |
| Sep 4, 3:57 PM PDT | Special Weather Statement | PSR | Riverside | 78 min |
| Sep 4, 4:09 PM PDT | Flash Flood Warning | PSR | Imperial | 92 min |
| Sep 4, 4:57 PM PDT | Special Weather Statement | PSR | Riverside | 48 min |
Nearby
Flash Flood Warnings in California, 2012Every flash flood warning in 2012
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.