Alert archive / Arizona / Areal Flood Warnings in 2016

Areal Flood Warning 2, NWS Las Vegas, NV

June 30, 2016Mohave County, Arizona

NWS Las Vegas, NV issued this areal flood warning at Jun 30, 2016, 8:55 PM MST for Mohave County, Arizona. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 30, 2016, 8:55 PM MST (03:55 UTC)
Expired: Jul 1, 2016, 8:45 AM MST
In force: 12 hr
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Flood severity: None

County Mohave County, AZ

The radar

The Las Vegas radar (KESX), 102 km from the middle of the area, began a volume at 03:55 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 00:00Z, 3.9 hours before the alert went out and 185 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1732 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -88 m²/s²
0-3 km storm-relative helicity: -134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood warning 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 areal flood warning went out at Jun 30, 3:15 PM MST, 5 hours 40 minutes earlier.

Area forecast discussion, Jun 30, 3:15 PM MST, 5 hours 40 minutes before

Area Forecast Discussion
National Weather Service Las Vegas NV
315 PM PDT THU JUN 30 2016

.SYNOPSIS...Monsoonal moisture that has spread up from northern
Mexico will fuel thunderstorms across the Mojave Desert region...
especially during the afternoon and evening hours through Saturday.
Temperatures will trend downward due to the increase in cloud cover.
Drier air is expected to work into the region early next week
pushing monsoonal moisture east of the area. This will also allow
for a warming trend with temperatures about 3 to 5 degrees above
normal by Monday.
&&

.SHORT TERM...through Saturday night.

Scattered to numerous thunderstorms have erupted over southern
Nevada and northwest Arizona thanks to the influx of low level
moisture we received this morning from a widespread push of
southeast flow below 700 mb. Surface heating and a boundary
associated with a disturbance moving from southeast Nevada into
southwest Utah helped initiate and intensify the thunderstorms and
we should see convection expand this afternoon and evening across
southern Nevada and northwest Arizona due to boundary interactions.
Convection will diminish overnight but probably not die completely
due to the moist and unstable environment.

Similarly moist and unstable conditions will exist over the same
area through Friday so we can expect scattered to numerous
thunderstorms Friday afternoon. Dry mid to upper level flow should
help clear mid to high level debris clouds overnight and allow for
full surface heating again Friday. Saturday will see a slight
decrease in thunderstorm coverage from west to east as dry westerly
flow starts to spread over southern Nevada.

.LONG TERM...Sunday through Wednesday.

Models remain consistent with Previous runs showing a significant
decrease in moisture on Sunday followed by dry weather areawide
Monday through Wednesday. Weak troughing passes through California
Sunday and through Nevada Monday, turning the flow more westerly and
flushing out the monsoon moisture from our area. This will eliminate
rain chances, knock surface dewpoints back down into the 20s and
30s, and also allow temperatures to climb back to several degrees
above normal. Longer range models hint at moisture possibly
returning around the end of the week, but there is plenty of time to
watch this.
&&

.AVIATION...For McCarran...Storms affecting the Las Vegas Valley at
this time will generate strong, erratic outflow for much of the
afternoon into early this evening. Probability of storms directly
impacting the airport is high. Potential for small hail and
torrential downpours reducing visibilities to at least MVFR levels
exists if a stronger core reaches the terminal. After a brief lull
tonight, similar conditions are anticipated tomorrow.

For the rest of southern Nevada...northwest Arizona...and southeast
California...Storms rapidly developing in the southern Great Basin
and Mojave Desert this afternoon. Multiple outflow boundaries are
expected to produce highly erratic, potentially gusty winds. Storms
likely to impact the Las Vegas Valley terminals, with potential
impacts to KEED and KIFP as well. MVFR cigs/visibilities possible
in/near storms. Similar conditions anticipated tomorrow.
&&

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any significant weather according to standard operating procedures.
Flash flooding will be a concern with any thunderstorm today
especially across Mohave, Clark, and eastern San Bernardino
Counties.
&&

Short Term...Adair
Long Term...Morgan
Aviation...Shafer

For more forecast information...see us on our webpage:

http://weather.gov/lasvegas or follow us on Facebook and Twitter

In the hours before

Local storm report, Jun 30, 7:14 PM MST, 1 hour 41 minutes before

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Local storm report, Jun 30, 7:33 PM MST, 1 hour 22 minutes before

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Local storm report, Jun 30, 8:16 PM MST, 39 minutes before

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<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.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Jun 30, 8:20 PM MST, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
820 PM PDT THU JUN 30 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0651 PM     FLASH FLOOD      15 NW NEEDLES           34.97N 114.82W
06/30/2016                   SAN BERNARDINO     CA   LAW ENFORCEMENT

            MAJOR FLOODING REPORTED AT US 95 AND GOFFS
            ROAD. MUD WAS IN THE ROADWAY.

&&

CMS

Local storm report, Jun 30, 8:24 PM MST, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
824 PM PDT THU JUN 30 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0515 PM     TSTM WND GST     COTTONWOOD COVE         35.49N 114.69W
06/30/2016  U64 MPH          CLARK              NV   MESONET

            HADS AUTOMATED STATION /CCPN2/.

&&

CMS

Local storm report, Jun 30, 8:50 PM MST, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAS VEGAS NV
850 PM PDT THU JUN 30 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     FLASH FLOOD      1 E GOLDEN VALLEY       35.22N 114.20W
06/30/2016                   MOHAVE             AZ   DEPT OF HIGHWAYS

            MOHAVE COUNTY ROADS REPORTS SEVERAL ROAD
            CLOSURES...INCLUDING PIERCE FERRY ROAD NEAR
            CHARLES STREET...ESTRELLA ROAD...EGAR
            ROAD...BOLSA ROAD FROM EGAR TO
            ADOBE...SHINARUMP FROM COLORADO TO
            EGAR...AND TEDDY ROOSEVELT FROM DIABASE TO
            SHINARUMP...FROM ONGOING FLASH FLOODING.

&&

CMS

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 5:48 PM MST	Severe Thunderstorm Warning	VEF	Clark	42 min
Jun 30, 5:54 PM MST	Flash Flood Warning	VEF	Clark	6 hr
Jun 30, 6:26 PM MST	Severe Thunderstorm Warning	VEF	Clark	34 min
Jun 30, 6:59 PM MST	Severe Thunderstorm Warning	VEF	Clark	31 min
Jun 30, 10:56 PM MST	Severe Thunderstorm Warning	VEF	Nye	64 min
Jun 30, 11:08 PM MST	Flash Flood Warning	VEF	Nye	4 hr
Jun 30, 11:49 PM MST	Flash Flood Warning	VEF	Clark, Nye	3 hr
Jul 1, 3:34 PM MST	Areal Flood Advisory	VEF	Nye	3 hr
Jul 1, 4:54 PM MST	Areal Flood Advisory	VEF	Lincoln	4 hr
Jun 30, 10:32 PM MST	Flash Flood Warning	VEF	Inyo	3 hr
Jul 1, 1:41 AM MST	Flash Flood Warning	VEF	San Bernardino	3 hr
Jul 1, 2:06 AM MST	Flash Flood Warning	VEF	San Bernardino	3 hr
Jul 1, 3:36 AM MST	Flash Flood Warning	VEF	San Bernardino	3 hr
Jul 1, 3:12 PM MST	Severe Thunderstorm Warning	VEF	San Bernardino	63 min
Jul 1, 3:25 PM MST	Areal Flood Advisory	VEF	San Bernardino	3 hr
Jul 1, 4:05 PM MST	Severe Thunderstorm Warning	VEF	San Bernardino	55 min
Jul 1, 4:24 PM MST	Flash Flood Warning	VEF	San Bernardino	3 hr
Jul 1, 4:59 PM MST	Severe Thunderstorm Warning	VEF	San Bernardino	61 min
Jun 30, 5:46 PM MST	Flash Flood Warning	VEF	Mohave	3 hr
Jun 30, 6:20 PM MST	Dust Storm Warning	VEF		100 min

Nearby

Areal Flood Warnings in Arizona, 2016 Every areal flood warning in 2016

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.