Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 69, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 10:38 AM PDT for San Bernardino County, California. It was in force for 94 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, 10:38 AM PDT (17:38 UTC)
- Expired
- Jul 31, 2012, 12:12 PM PDT
- In force
- 94 min
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Flood severity
- None
County San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 176 km from the middle of the area, began a volume at 17:39 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 31, 11:28 AM PDT | FLASH FLOOD | 10 Wsw Vidal Junction, CA | CALIFORNIA HIGHWAY PATROL REPORTS ROADWAY FLOODING ON STATE ROUTE 62 AND HIGHWAY 95 BETWEEN MILE MARKERS 104 AND 110. STATE ROUTE 62 HAS BEEN CLOSED WEST OF VIDAL JUNCTION. |
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 12:00Z, 5.6 hours before the alert went out and 258 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
- 121 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1334 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- -43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
136 WGUS55 KVEF 311738 FFWVEF CAC071-311930- /O.NEW.KVEF.FF.W.0069.120731T1738Z-120731T1930Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 1038 AM PDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... EXTREME SOUTHEASTERN SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 1230 PM PDT. * AT 1034 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN OVER NORTHERN RIVERSIDE COUNTY MOVING NORTH INTO SAN BERNARDINO COUNTY. THE HEAVY RAIN WILL LIKELY CAUSE FLASH FLOODING ON HIGHWAY 62 BETWEEN MILE MARKERS 98 AND 116. * LOCATIONS IMPACTED INCLUDE... HIGHWAY 62. 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 3414 11501 3413 11472 3408 11470 3408 11500 $$ MORGAN
2 follow-up statements
041 WGUS75 KVEF 311834 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1134 AM PDT TUE JUL 31 2012 CAC071-311930- /O.CON.KVEF.FF.W.0069.000000T0000Z-120731T1930Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 1134 AM PDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 PM PDT FOR EXTREME SOUTHEASTERN SAN BERNARDINO COUNTY... AT 1131 AM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE RAIN OVER HIGHWAY 62 BETWEEN MILE MARKERS 98 AND 116. VERY HEAVY RAIN FELL IN THE AREA BETWEEN 1045 AM AND 1115 AM...AND AT 1128 AM THE CALIFORNIA HIGHWAY PATROL REPORTED THAT HIGHWAY 62 WAS BEING CLOSED. LOCATIONS IMPACTED INCLUDE... HIGHWAY 62. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3414 11501 3413 11472 3408 11470 3408 11500 $$ MORGAN
100 WGUS75 KVEF 311912 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 1212 PM PDT TUE JUL 31 2012 CAC071-311922- /O.CAN.KVEF.FF.W.0069.000000T0000Z-120731T1930Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 1212 PM PDT TUE JUL 31 2012 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EXTREME SOUTHEASTERN SAN BERNARDINO COUNTY... THE FLASH FLOOD WARNING FOR HIGHWAY 62 BETWEEN MILE MARKERS 98 AND 116 HAS BEEN CANCELLED...AND REPLACED BY A NEW WARNING WHICH IS VALID UNTIL 2 PM. LAT...LON 3414 11501 3413 11472 3408 11470 3408 11500 $$ MORGAN
The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:54 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 51 min |
| Jul 31, 2:29 AM PDT | Flash Flood Watch | VEF | San Bernardino | 19 hr |
| Jul 31, 10:00 AM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 31, 10:08 AM PDT | Flash Flood Warning | VEF | San Bernardino | 112 min |
| Jul 31, 11:58 AM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 31, 12:03 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
| Jul 31, 1:30 PM PDT | Flash Flood Warning | VEF | San Bernardino | 49 min |
| Jul 31, 2:00 PM PDT | Flash Flood Warning | VEF | San Bernardino | 2 hr |
| Jul 31, 3:05 PM PDT | Flash Flood Warning | VEF | San Bernardino | 42 min |
| Jul 31, 3:25 PM PDT | Flash Flood Warning | VEF | San Bernardino | 65 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.