Alert archive / Arizona / Flash Flood Warnings in 2010

Flash Flood Warning 20, NWS Flagstaff, AZ

July 31, 2010Apache County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 31, 2010, 6:39 PM MST for Apache County, Arizona. It was in force for 111 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 31, 2010, 6:39 PM MST (01:39 UTC)
Expired: Jul 31, 2010, 8:30 PM MST
In force: 111 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

County Apache County, AZ

The radar

The Flagstaff radar (KFSX), 181 km from the middle of the area, began a volume at 01:39 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, 1.7 hours before the alert went out and 210 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: 234 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 5 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 warning 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 warning went out at Jul 31, 2:33 PM MST, 4 hours 6 minutes earlier.

Area forecast discussion, Jul 31, 2:33 PM MST, 4 hours 6 minutes before

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Hazardous weather outlook, Jul 31, 9:46 AM MST, 8 hours 53 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
946 AM MST SAT JUL 31 2010

AZZ004>018-037>040-010700-
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-
946 AM MST SAT JUL 31 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL
ARIZONA...NORTH CENTRAL ARIZONA...NORTHEAST ARIZONA AND WEST
CENTRAL ARIZONA.

.DAY ONE...TODAY AND TONIGHT

NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS NORTHERN
ARIZONA TODAY. THE MAIN THREATS WILL BE EXTREMELY HEAVY RAIN AND
LOCALIZED FLOODING. HEAVY RAINFALL WILL CONTINUE IN AND NEAR
YAVAPAI COUNTY THIS MORNING...THEN LATE IN THE MORNING THROUGH THE
AFTERNOON AND EVENING STORMS ARE EXPECTED TO BECOME NUMEROUS ACROSS
NORTHERN ARIZONA. IN ADDITION...FREQUENT CLOUD-TO-GROUND
LIGHTNING WILL ACCOMPANY THUNDERSTORMS. A FLASH FLOOD WATCH IS IN
EFFECT UNTIL MIDNIGHT TONIGHT FOR ALL NORTHERN ARIZONA FORECAST
ZONES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

HIGH PRESSURE EAST OF ARIZONA WILL CONTINUE TO BRING MOIST
SOUTHEASTERLY FLOW OVER THE STATE. THE THREAT FOR SHOWERS AND
THUNDERSTORMS ALONG WITH HEAVY RAIN WILL CONTINUE INTO EARLY NEXT
WEEK WITH A POTENTIAL DRYING TREND BEGINNING BY MIDWEEK.

.SPOTTER INFORMATION STATEMENT...

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

In the hours before

Local storm report, Jul 31, 4:25 PM MST, 2 hours 14 minutes before

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Local storm report, Jul 31, 6:02 PM MST, 37 minutes before

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Local storm report, Jul 31, 6:06 PM MST, 33 minutes before

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Local storm report, Jul 31, 6:21 PM MST, 18 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 5:45 PM MST	Areal Flood Advisory	FGZ	Apache, Navajo	2 hr
Jul 31, 8:15 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Jul 31, 8:41 PM MST	Flash Flood Warning	FGZ	Apache, Navajo	3 hr
Jul 31, 9:48 PM MST	Areal Flood Advisory	FGZ	Coconino	6 hr
Aug 1, 2:45 AM MST	Flash Flood Watch	FGZ	Apache, Coconino, Gila, Navajo, Yavapai	18 hr
Aug 1, 9:42 AM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 1, 1:03 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 1, 2:44 PM MST	Flash Flood Warning	FGZ	Navajo	91 min

Nearby

Flash Flood Warnings in Arizona, 2010 Every flash flood warning 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.