Alert archive / California / Flash Flood Warnings in 2012
Flash Flood Warning 74, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Jul 31, 2012, 2:00 PM PDT for San Bernardino County, California. It was in force for 2 hr. 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, 2:00 PM PDT (21:00 UTC)
- Expired
- Jul 31, 2012, 4:00 PM PDT
- In force
- 2 hr
- 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), 84 km from the middle of the area, began a volume at 21:00 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, 2:42 PM PDT | FLASH FLOOD | 9 Nw Needles, CA | CALIFORNIA HIGHWAY PATROL REPORTS FLOODING ACROSS ROADWAY APPROXIMATELY 5 MILES NORTH OF I-40 ON US 95. |
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, 9.0 hours before the alert went out and 171 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.
826 WGUS55 KVEF 312100 FFWVEF CAC071-312300- /O.NEW.KVEF.FF.W.0074.120731T2100Z-120731T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LAS VEGAS NV 200 PM PDT TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN LAS VEGAS HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL SAN BERNARDINO COUNTY IN SOUTHERN CALIFORNIA... * UNTIL 400 PM PDT. * AT 155 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR HIGHWAY 95 AND I-40. LOW WATER CROSSINGS ON HIGHWAY 95 JUST NORTH OF INTERSTATE 40 WILL BE AT RISK OF FLOODING...ALONG WITH GOFFS ROAD. * LOCATIONS IMPACTED INCLUDE... HIGHWAY 95 AND GOFFS ROAD. THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 124 AND 136. 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 3502 11494 3502 11472 3484 11471 3484 11493 $$ MORGAN
2 follow-up statements
497 WGUS75 KVEF 312150 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 250 PM PDT TUE JUL 31 2012 CAC071-312300- /O.CON.KVEF.FF.W.0074.000000T0000Z-120731T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 250 PM PDT TUE JUL 31 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 PM PDT FOR EAST CENTRAL SAN BERNARDINO COUNTY... AT 242 PM PDT...THE CALIFORNIA HIGHWAY PATROL REPORTED FLOODING ON HIGHWAY 95 FIVE MILES NORTH OF INTERSTATE 40. RADAR SHOWED ONLY LIGHT RAIN REMAINING IN THE AREA AT 248 PM PDT...BUT RUNOFF FROM EARLIER HEAVY RAIN WILL CONTINUE TO CAUSE FLOODING. LOCATIONS IMPACTED INCLUDE... HIGHWAY 95 NORTH OF INTERSTATE 40. PRECAUTIONARY/PREPAREDNESS ACTIONS... FLASH FLOODING IS EXPECTED IN WASHES...LOW WATER CROSSINGS AND ON AREA ROADWAYS. FLASH FLOODING IS NATURES NUMBER ONE KILLER. TO ESCAPE RISING WATER...MOVE TO HIGHER GROUND. NEVER TRY TO CROSS A FLOODED ROADWAY OR WALK THROUGH FLOODWATERS. TURN AROUND...DONT DROWN! REPORT FLOODING BY POSTING YOUR REPORT TO THE LAS VEGAS NATIONAL WEATHER SERVICE FACEBOOK PAGE...OR BY USING THE TWITTER HASHTAG... NWSVEGAS. && LAT...LON 3502 11494 3502 11472 3484 11471 3484 11493 $$ MORGAN
520 WGUS75 KVEF 312251 FFSVEF FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LAS VEGAS NV 351 PM PDT TUE JUL 31 2012 CAC071-312300- /O.EXP.KVEF.FF.W.0074.000000T0000Z-120731T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN BERNARDINO CA- 351 PM PDT TUE JUL 31 2012 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 400 PM PDT FOR EAST CENTRAL SAN BERNARDINO COUNTY... AT 350 PM PDT...RADAR INDICATED THAT RAIN HAD ENDED NEAR THE INTERSECTION OF HIGHWAY 95 AND INTERSTATE 40. THEREFORE...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE. LAT...LON 3502 11494 3502 11472 3484 11471 3484 11493 $$ 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, 10:38 AM PDT | Flash Flood Warning | VEF | San Bernardino | 94 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, 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.