Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 37, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Aug 17, 2012, 2:32 PM PDT for Riverside County, San Bernardino County, California. It was in force for 118 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
- Aug 17, 2012, 2:32 PM PDT (21:32 UTC)
- Expired
- Aug 17, 2012, 4:30 PM PDT
- In force
- 118 min
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Flood severity
- None
The radar
The Santa Ana Mts radar (KSOX), 137 km from the middle of the area, began a volume at 21:34 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, 9.5 hours before the alert went out and 170 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
- 139 J/kg
- Mixed-layer CIN
- -312 J/kg
- Mixed-layer LCL
- 1655 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
759
WGUS55 KPSR 172132
FFWPSR
CAC065-071-172330-
/O.NEW.KPSR.FF.W.0037.120817T2132Z-120817T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
232 PM PDT FRI AUG 17 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 430 PM PDT
* AT 221 PM PDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
VERY HEAVY RAIN THAT WILL CAUSE FLASH FLOODING.
* THE STORM PRODUCING VERY HEAVY RAIN THAT WILL CAUSE FLASH
FLOODING IN INDIAN COVE AND BLACK ROCK CANYON IN JOSHUA TREE
NATIONAL PARK. FLASH FLOODING WILL OTHERWISE REMAIN OVER MAINLY
RURAL AREAS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY
DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED
CROSSINGS WILL BE ESPECIALLY DANGEROUS.
&&
LAT...LON 3408 11628 3408 11626 3412 11626 3412 11606
3411 11605 3411 11604 3397 11608 3399 11629
$$
MCLANE2 follow-up statements
002
WGUS75 KPSR 172303
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
403 PM PDT FRI AUG 17 2012
CAC065-071-172330-
/O.CON.KPSR.FF.W.0037.000000T0000Z-120817T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-SAN BERNARDINO CA-
403 PM PDT FRI AUG 17 2012
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO AND NORTH CENTRAL RIVERSIDE COUNTIES...
AT 356 PM PDT...THUNDERSTORMS WERE CONTINUING TO MOVE THROUGH
PORTIONS OF JOSHUA TREE NATIONAL PARK PRODUCING HEAVY RAINFALL.
FLASH FLOODING REMAINS LIKELY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A FLASH FLOOD WARNING MEANS THAT PEOPLE ALONG THE BANKS OF WASHES AND
CREEKS SHOULD MOVE TO HIGHER GROUND IMMEDIATELY. NORMALLY DRY WASHES
AND STREAMS WILL SUDDENLY HAVE RUNNING WATER AND MAKE UNBRIDGED
CROSSINGS IMPASSABLE. STREETS...UNDERPASSES...AND LOW SPOTS WILL
BECOME INUNDATED MAKING DRIVING HAZARDOUS IN THE WARNED AREA.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF NORMALLY
DRY WASHES AND CREEKS...ROADS...AND LOW LYING SPOTS. UNBRIDGED
CROSSINGS WILL BE ESPECIALLY DANGEROUS.
&&
LAT...LON 3408 11628 3408 11626 3412 11626 3412 11606
3411 11605 3411 11604 3397 11608 3399 11629
$$
MCLANE823
WGUS75 KPSR 172330
FFSPSR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
430 PM PDT FRI AUG 17 2012
CAC065-071-172337-
/O.EXP.KPSR.FF.W.0037.000000T0000Z-120817T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
RIVERSIDE CA-SAN BERNARDINO CA-
430 PM PDT FRI AUG 17 2012
...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM PDT FOR SOUTH
CENTRAL SAN BERNARDINO AND NORTH CENTRAL RIVERSIDE COUNTIES...
HEAVY RAIN HAS ENDED ACROSS THE REGION. THE FLASH FLOOD WARNING HAS
THEREFORE BEEN ALLOWED TO EXPIRE FOR SOUTH CENTRAL SAN BERNARDINO
AND NORTH CENTRAL RIVERSIDE COUNTIES.
INDIVIDUALS IN THE AREA SHOULD CONTINUE TO REMAIN ALERT...AS HIGH
WATER WILL CONTINUE TO FLOW IN MANY DRAINAGE BASINS FOR THE NEXT FEW
HOURS.
LAT...LON 3408 11628 3408 11626 3412 11626 3412 11606
3411 11605 3411 11604 3397 11608 3399 11629
$$
MCLANEThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 11:29 PM PDT | Areal Flood Advisory | PSR | Riverside | 2 hr |
| Aug 17, 12:54 AM PDT | Areal Flood Advisory | PSR | Imperial | 111 min |
| Aug 17, 11:59 AM PDT | Blowing Dust Advisory | PSR | 2 hr | |
| Aug 17, 2:25 PM PDT | Special Weather Statement | PSR | Riverside | 50 min |
| Aug 17, 2:57 PM PDT | Areal Flood Advisory | PSR | Riverside | 2 hr |
| Aug 17, 3:28 PM PDT | Special Weather Statement | PSR | Riverside | 47 min |
| Aug 17, 3:44 PM PDT | Special Weather Statement | PSR | Riverside | 31 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.