Alert archive / Nevada / Flash Flood Watches in 2010
Flash Flood Watch 3, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood watch at Dec 20, 2010, 4:31 AM PST for Clark County, Lincoln County, Nye County, Nevada; Inyo County, San Bernardino County, California; Mohave County, Arizona. It took effect at Dec 20, 2010, 12:00 PM PST. It was in force for 58 hr.
The area
The counties it named.
The facts
- Issued
- Dec 20, 2010, 4:31 AM PST (12:31 UTC)
- In effect from
- Dec 20, 2010, 12:00 PM PST
- Expired
- Dec 22, 2010, 10:03 PM PST
- In force
- 58 hr
- Issued by
- NWS Las Vegas, NV
- Flood severity
- None
Counties Mohave County, AZ, Inyo County, CA, San Bernardino County, CA, Clark County, NV, Lincoln County, NV, Nye County, NV
The radar
The Las Vegas radar (KESX), 110 km from the middle of the area, began a volume at 12:33 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
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 0.5 hours before the alert went out and 372 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
- 19 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 609 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 412 m²/s²
- 0-3 km storm-relative helicity
- 760 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Las Vegas, NV wrote its last area forecast discussion before this flash flood watch went out at Dec 20, 3:45 AM PST, 46 minutes earlier.
Area forecast discussion, Dec 20, 3:45 AM PST, 46 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Hazardous weather outlook, Dec 19, 6:03 AM PST, 22 hours 28 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LAS VEGAS NV 603 AM PST SUN DEC 19 2010 CAZ519-200300- EASTERN SIERRA SLOPES- 603 AM PST SUN DEC 19 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CALIFORNIA. .DAY ONE...TODAY AND TONIGHT THE WINTER STORM WARNING REMAINS IN EFFECT THROUGH 4 AM MONDAY MORNING. ADDITION ACCUMULATIONS OF 12 TO 24 INCHES MAY BE SEEN BY MONDAY MORNING AT THE 8000 FOOT LEVEL WITH 2 TO 3 ADDITIONAL FEET IN THE HIGHER ELEVATIONS. GUSTY WINDS AT TIMES WILL ALSO CREATE AREAS OF BLOWING AND DRIFTING SNOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SNOW...LOCALLY HEAVY AT TIMES WILL CONTINUE ON MONDAY BEFORE TAPERING OFF AND TURNING TO SHOWERS ON TUESDAY AND WEDNESDAY. DRYING WILL BE SEEN THURSDAY AND FRIDAY BUT ANOTHER STORM WILL BEGIN TO MOVE INTO THE AREA OVER THE CHRISTMAS WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ002-003-CAZ520>527-NVZ014-017>020-022-200300- LOWER COLORADO RIVER VALLEY-NORTHWEST DESERTS-OWENS VALLEY- WHITE MOUNTAINS OF INYO COUNTY-DEATH VALLEY NATIONAL PARK- WESTERN MOJAVE DESERT-EASTERN MOJAVE DESERT-MORONGO BASIN- CADIZ BASIN-SAN BERNARDINO COUNTY-UPPER COLORADO RIVER VALLEY- ESMERALDA AND CENTRAL NYE COUNTY- WESTERN CLARK AND SOUTHERN NYE COUNTY-SHEEP RANGE- SPRING MOUNTAINS-LAS VEGAS VALLEY-SOUTHERN CLARK COUNTY- 603 AM PST SUN DEC 19 2010 /703 AM MST SUN DEC 19 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA...CALIFORNIA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT AREAS OF LIGHT RAIN AND SNOW WILL OCCUR ACROSS THE REGION TODAY AND TONIGHT. MEASURABLE SNOWFALL WILL BE CONFINED TO ELEVATIONS ABOVE 8000 FEET WITH ACCUMULATIONS GENERALLY OF 1 TO 3 INCHES. LOCAL GUSTY WINDS TO NEAR 40 MPH WILL ALSO BE SEEN ACROSS MUCH OF THE AREA. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY RAIN AND SNOW WILL INCREASE...ESPECIALLY ALONG THE INTERSTATE 15 CORRIDOR MONDAY AND INTO TUESDAY BEFORE SLOWLY SHIFTING SOUTH ON WEDNESDAY. LOCALLY HEAVY RAINFALL MAY BE SEEN DURING THIS TIME WITH SNOW OVER THE HIGHEST ELEVATIONS. GUSTY WINDS ARE POSSIBLE ON MONDAY. THURSDAY AND FRIDAY WILL SEE A DRYING TREND...BUT ANOTHER STORM IS FORECAST TO MOVE INTO THE AREA ON CHRISTMAS DAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. AZZ001-036-NVZ015-016-021-200300- NORTHWEST PLATEAU-LAKE MEAD NATIONAL RECREATION AREA- LINCOLN COUNTY-NORTHEAST CLARK COUNTY- 603 AM PST SUN DEC 19 2010 /703 AM MST SUN DEC 19 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST ARIZONA AND SOUTHERN NEVADA. .DAY ONE...TODAY AND TONIGHT AREAS OF LIGHT RAIN WILL OCCUR ACROSS THE REGION TODAY AND TONIGHT WITH LOCAL GUSTY WINDS TO NEAR 40 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY RAIN AND SNOW WILL INCREASE...ESPECIALLY TUESDAY INTO WEDNESDAY BEFORE MOVING OUT OF THE AREA THURSDAY AND FRIDAY. LOCALLY HEAVY RAINFALL IS POSSIBLE FROM THE MONDAY AFTERNOON THROUGH WEDNESDAY TIMEFRAME WITH POSSIBLE TOTAL RAINFALL ACCUMULATIONS OF 3 INCHES OR MORE IN SOME AREAS. THIS RAINFALL WILL LIKELY INCREASE THE FLOW ALONG THE VIRGIN AND MUDDY RIVERS. AT THE SAME TIME...LOWERING SNOW LEVELS MAY CREATE ACCUMULATIONS AT THE HIGHER ELEVATIONS... ESPECIALLY TUESDAY AND WEDNESDAY. AFTER THE DRYING ON THURSDAY AND FRIDAY ANOTHER STORM WILL BE HEADING TOWARDS THE AREA ON CHRISTMAS DAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. HOWEVER...SPOTTERS ARE ENCOURAGED TO REPORT ANY SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Local storm report, Dec 20, 12:08 AM PST, 4 hours 23 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>Local storm report, Dec 20, 12:12 AM PST, 4 hours 19 minutes before
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 3:52 AM PST | Wind Advisory | VEF | Clark, Nye | 3 hr |
| Dec 20, 11:37 AM PST | Areal Flood Warning | VEF | Clark | 3 days |
| Dec 20, 2:44 PM PST | Flash Flood Warning | VEF | Clark | 6 hr |
| Dec 19, 4:49 PM PST | Flash Flood Warning | VEF | Inyo | 6 hr |
| Dec 19, 4:55 PM PST | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Dec 20, 1:32 AM PST | Areal Flood Advisory | VEF | San Bernardino | 88 min |
| Dec 20, 2:00 PM PST | Flash Flood Warning | VEF | San Bernardino | 18 hr |
| Dec 20, 2:23 PM PST | Areal Flood Advisory | VEF | 4 hr | |
| Dec 20, 2:51 PM PST | Flash Flood Warning | VEF | San Bernardino | 6 hr |
| Dec 20, 3:20 PM PST | Winter Storm Watch | VEF | Inyo | 12 hr |
| Dec 20, 3:25 PM PST | Areal Flood Advisory | VEF | Inyo, San Bernardino | 8 hr |
Nearby
Flash Flood Watches in Nevada, 2010Flash Flood Watches in California, 2010Flash Flood Watches in Arizona, 2010Every flash flood watch in 2010
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.