Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 86, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 11:31 PM PDT for San Bernardino County, California. It was in force for 119 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 31, 2012, 11:31 PM PDT (06:31 UTC)
- Expired
- Aug 1, 2012, 1:30 AM PDT
- In force
- 119 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 11:40 PM PDT | FLASH FLOOD | 1 N Trona, CA | ESTIMATED 8 TO 12 INCHES OF WATER FLOWING ACROSS TRONA ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 00:00Z, 6.5 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
- 646 J/kg
- Mixed-layer CIN
- -52 J/kg
- Mixed-layer LCL
- 1370 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
687 WGUS55 KVEF 010631 FFWVEF CAC071-010830- /O.NEW.KVEF.FF.W.0086.120801T0631Z-120801T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1131 PM PDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 130 AM PDT. * AT 1127 PM PDT...A TRAINED WEATHER SPOTTER REPORTED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR TRONA...OR 20 MILES NORTHEAST OF RIDGECREST. THE STORM WAS MOVING SOUTHWEST AT 20 MPH. * LOCATIONS IMPACTED INCLUDE... MAINLY RURAL AREAS OF NORTHWESTERN SAN BERNARDINO COUNTY INCLUDING TRONA AND STATE ROUTE 178. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3542 11691 3543 11758 3580 11752 3579 11682 $$ JA
2 follow-up statements
578 WGUS75 KVEF 010723 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1223 AM PDT WED AUG 1 2012 CAC071-010830- /O.CON.KVEF.FF.W.0086.000000T0000Z-120801T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 1223 AM PDT WED AUG 1 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM PDT FOR NORTHWESTERN SAN BERNARDINO COUNTY... TRAINED WEATHER SPOTTERS REPORTED SOME ROADS FLOODED IN TRONA WITH 8 TO 12 INCHES OF RUNNING WATER. THUNDERSTORMS MOVED SOUTH OF THE AREA AND WERE DISSIPATING AND ONLY LIGHT RAIN SHOWERS REMAINED OVER THE WARNING AREA. FLOODED ROADS AROUND TRONA CAN STILL BE EXPECTED UNTIL 130 AM AS RUNOFF FROM THE EARLIER HEAVY RAIN SLOWLY RECEDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3579 11750 3579 11682 3542 11691 3543 11739 $$ JA
919 WGUS75 KVEF 010826 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 126 AM PDT WED AUG 1 2012 CAC071-010830- /O.EXP.KVEF.FF.W.0086.000000T0000Z-120801T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 126 AM PDT WED AUG 1 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 130 AM PDT FOR NORTHWESTERN SAN BERNARDINO COUNTY... HEAVY RAIN HAS NOT FALLEN NEAR TRONA SINCE MIDNIGHT AND ONLY LIGHT RAIN SHOWERS WERE OCCURRING EARLY THIS MORNING. RUNOFF FROM THE EARLIER HEAVY RAINFALL HAS LIKELY RECEDED AND THE FLASH FLOOD WARNING WILL EXPIRE AT 130 AM. LAT...LON 3579 11750 3579 11682 3542 11691 3543 11739 $$ JA
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 10:12 PM PDT | Areal Flood Advisory | VEF | Inyo | 42 min |
| Jul 31, 10:51 PM PDT | Flash Flood Warning | VEF | Inyo | 114 min |
| Aug 1, 2:44 AM PDT | Flash Flood Watch | VEF | San Bernardino | 20 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.