Alert archive / Arizona / Flash Flood Watches in 2013

Flash Flood Watch 4, NWS Flagstaff, AZ

July 27, 2013Apache County, Coconino County, Navajo County, Arizona

NWS Flagstaff, AZ issued this flash flood watch at Jul 27, 2013, 10:34 AM MST for Apache County, Coconino County, Navajo County, Arizona. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Jul 27, 2013, 10:34 AM MST (17:34 UTC)
Expired
Jul 27, 2013, 11:00 PM MST
In force
12 hr
Issued by
NWS Flagstaff, AZ
Flood severity
None

Counties Apache County, AZ, Coconino County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 17:37 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, 5.6 hours before the alert went out and 121 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 2013-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 9 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 2013-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.193958Sfc1 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
9 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1323 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
40 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 flash flood watch 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 flash flood watch went out at Jul 27, 9:51 AM MST, 43 minutes earlier.

Area forecast discussion, Jul 27, 9:51 AM MST, 43 minutes before
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Hazardous weather outlook, Jul 27, 5:09 AM MST, 5 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
509 AM MST SAT JUL 27 2013

AZZ004>018-037>040-280700-
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-
509 AM MST SAT JUL 27 2013

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

.DAY ONE...TODAY AND TONIGHT

MONSOON MOISTURE WILL REMAIN OVER NORTHERN ARIZONA WITH ANOTHER
ROUND OF THUNDERSTORMS DEVELOPING DURING THE DAY. STORMS WILL BE
MOST NUMEROUS FROM THE MOGOLLON RIM NORTHWARD ACROSS THE NAVAJO
AND HOPI NATIONS. THE MAIN THREAT FROM STORMS WILL CONTINUE TO BE
HEAVY RAIN.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

EXPECT ANOTHER ROUND OF THUNDERSTORMS ON SUNDAY AS MOISTURE
REMAINS IN PLACE. BY MONDAY...DRIER AIR WILL MOVE OVER THE AREA
WITH THUNDERSTORM AND SHOWER ACTIVITY BECOMING ISOLATED.

.SPOTTER INFORMATION STATEMENT...

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

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 5:00 PM MSTAreal Flood AdvisoryFGZCoconino, Navajo3 hr
Jul 26, 6:34 PM MSTSpecial Weather StatementFGZ26 min
Jul 26, 8:54 PM MSTFlash Flood WarningFGZYavapai3 hr
Jul 27, 7:38 AM MSTAreal Flood AdvisoryFGZGila3 hr
Jul 27, 10:58 AM MSTAreal Flood AdvisoryFGZCoconino, Navajo3 hr
Jul 27, 2:16 PM MSTAreal Flood AdvisoryFGZCoconino4 hr
Jul 27, 2:59 PM MSTAreal Flood AdvisoryFGZCoconino3 hr
Jul 27, 3:21 PM MSTFlash Flood WarningFGZCoconino4 hr
Jul 27, 3:40 PM MSTAreal Flood AdvisoryFGZCoconino3 hr
Jul 27, 4:17 PM MSTAreal Flood AdvisoryFGZYavapai88 min
Jul 27, 4:35 PM MSTAreal Flood AdvisoryFGZCoconino, Yavapai3 hr
Jul 27, 4:49 PM MSTSpecial Weather StatementFGZ41 min

Nearby

Flash Flood Watches in Arizona, 2013Every flash flood watch in 2013

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.