Alert archive / Arizona / Special Weather Statements in 2016

Special Weather Statement, NWS Flagstaff, AZ

August 6, 2016Coconino County, Arizona

NWS Flagstaff, AZ issued this special weather statement at Aug 6, 2016, 2:59 PM MST for Coconino County, Arizona. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 6, 2016, 2:59 PM MST (21:59 UTC)
Expired
Aug 6, 2016, 3:30 PM MST
In force
31 min
Issued by
NWS Flagstaff, AZ

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 175 km from the middle of the area, began a volume at 22:01 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, 10.0 hours before the alert went out and 84 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2016-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 147 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2016-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
147 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1344 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Flagstaff, AZ wrote its last area forecast discussion before this special weather statement went out at Aug 6, 9:40 AM MST, 5 hours 19 minutes earlier.

Area forecast discussion, Aug 6, 9:40 AM MST, 5 hours 19 minutes before
Area Forecast Discussion
National Weather Service Flagstaff AZ
940 AM MST SAT AUG 06 2016

.SYNOPSIS...Expect scattered showers and thunderstorms mainly from
Flagstaff north and east today. Storms will become more isolated and
located mainly near the New mexico border by Sunday and Monday. A
surge in tropical moisture will bring active conditions back to the
area by the middle of next week.

&&

.DISCUSSION...A glance at the sky this morning indicates decent
instability in the boundary layer and up through about 500mb. The
12z KFLG sounding supports this, with drier and somewhat more stable
air above 500mb. With this profile and deeper moisture still to our
east, there is potential today, for a severe thunderstorm or two.
The best chance of this would be northeast of Flagstaff. To the west
of Flagstaff, the airmass will continue to slowly dry and stabilize.
By Sunday and Monday, most activity will be near the New Mexico
border. The current forecast covers this well, no updates.

&&

.AVIATION...For the 18Z package...Expect isolated to scattered
showers and thunderstorms today, with higher chances over eastern
Arizona in Apache and Navajo counties. Aviation discussion not
updated for TAF amendments.

&&

.FGZ WATCHES/WARNINGS/ADVISORIES...NONE.

&&

PUBLIC...Peterson
AVIATION...Bohlin

For Northern Arizona weather information visit
weather.gov/flagstaff
Hazardous weather outlook, Aug 6, 5:20 AM MST, 9 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
520 AM MST SAT AUG 6 2016

AZZ004>018-037>040-070600-
KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY-
COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS-
NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY-
CHUSKA MOUNTAINS AND DEFIANCE PLATEAU-
LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-
LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY-
LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY-
WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS-
NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS-
OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA-
NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-
520 AM MST SAT AUG 6 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO...
NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN
ARIZONA.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS MAY PRODUCE LOCALIZED FLASH
FLOODING, WITH THE BEST CHANCES ALONG AND NORTH OF THE MOGOLLON
RIM.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

A DRYING TREND IS FORECAST ON SUNDAY AND MONDAY. AN UPTICK IN
THUNDERSTORM ACTIVITY IS POSSIBLE AS EARLY AS TUESDAY.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

In the hours before

Local storm report, Aug 6, 12:30 PM MST, 2 hours 29 minutes before
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Special weather statement, Aug 6, 2:59 PM MST, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
259 PM MST SAT AUG 6 2016

AZZ006-007-062230-
GRAND CANYON COUNTRY AZ-COCONINO PLATEAU AZ-
259 PM MST SAT AUG 6 2016

...SIGNIFICANT WEATHER ADVISORY FOR COCONINO COUNTY UNTIL 330 PM
MST...

AT 258 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10
MILES WEST OF TUSAYAN...OR 27 MILES WEST OF DESERT VIEW AT GRAND
CANYON... MOVING NORTHEAST AT 15 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
TEN-X CAMPGROUND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3573 11237 3580 11247 3607 11231 3595 11209
TIME...MOT...LOC 2158Z 215DEG 14KT 3592 11229

MOTTICE

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 5, 5:10 PM MSTSpecial Weather StatementFGZYavapai35 min
Aug 5, 5:20 PM MSTFlash Flood WarningFGZApache115 min
Aug 5, 6:09 PM MSTSpecial Weather StatementFGZYavapai36 min
Aug 5, 6:21 PM MSTAreal Flood AdvisoryFGZYavapai3 hr
Aug 6, 11:33 AM MSTSevere Thunderstorm WarningFGZCoconino27 min
Aug 6, 11:59 AM MSTSevere Thunderstorm WarningFGZCoconino17 min
Aug 6, 3:14 PM MSTSpecial Weather StatementFGZCoconino31 min
Aug 6, 3:45 PM MSTSpecial Weather StatementFGZYavapai30 min

Nearby

Special Weather Statements in Arizona, 2016Every special weather statement 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.