Alert archive / Arizona / Areal Flood Warnings in 2012

Areal Flood Warning 10, NWS Tucson, AZ

September 10, 2012Pima County, Arizona

NWS Tucson, AZ issued this areal flood warning at Sep 10, 2012, 12:46 PM MST for Pima County, Arizona. It was in force for 30 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
Sep 10, 2012, 12:46 PM MST (19:46 UTC)
Expired
Sep 11, 2012, 6:45 PM MST
In force
30 hr
Issued by
NWS Tucson, AZ
Area
Storm-based polygon
Flood severity
None

County Pima County, AZ

The radar

The Tucson radar (KEMX), 112 km from the middle of the area, began a volume at 19:46 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

Tuscon, AZ (KTUS), launched 12:00Z, 7.8 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, Tuscon, AZ at 12:00Z on 2012-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 773 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 2012-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
773 J/kg
Mixed-layer CIN
-124 J/kg
Mixed-layer LCL
1076 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

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 Tucson, AZ wrote its last area forecast discussion before this areal flood warning went out at Sep 10, 9:20 AM MST, 3 hours 26 minutes earlier.

Area forecast discussion, Sep 10, 9:20 AM MST, 3 hours 26 minutes before
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Hazardous weather outlook, Sep 10, 8:57 AM MST, 3 hours 49 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
857 AM MST MON SEP 10 2012

AZZ501>515-110600-
WESTERN PIMA COUNTY-TOHONO O'ODHAM NATION-
UPPER SANTA CRUZ RIVER VALLEY/ALTAR VALLEY-TUCSON METRO AREA-
SOUTH CENTRAL PINAL COUNTY-SOUTHEAST PINAL COUNTY-
UPPER SAN PEDRO RIVER VALLEY-
EASTERN COCHISE COUNTY BELOW 5000 FEET-UPPER GILA RIVER VALLEY-
WHITE MOUNTAINS OF GRAHAM AND GREENLEE COUNTIES-
GALIURO AND PINALENO MOUNTAINS-CHIRICAHUA MOUNTAINS-
DRAGOON AND MULE AND HUACHUCA AND SANTA RITA MOUNTAINS-
CATALINA AND RINCON MOUNTAINS-BABOQUIVARI MOUNTAINS-
857 AM MST MON SEP 10 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
ARIZONA.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED ONCE AGAIN TODAY
FOR SOUTHEAST ARIZONA...WITH THE GREATEST COVERAGE FROM THE TUCSON
AREA WESTWARD. WITH ABUNDANT MOISTURE IN THE ATMOSPHERE...THE
PRIMARY CONCERN WILL CONTINUE TO BE HEAVY RAINFALL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

AN AREA OF LOW PRESSURE WILL MOVE ACROSS ARIZONA TUESDAY RESULTING
IN CONTINUED SCATTERED SHOWERS AND THUNDERSTORMS WITH MORE HEAVY
RAINFALL POSSIBLE. THEREAFTER...DRIER AIR WILL START TO MOVE IN
FROM THE WEST WHICH WILL RESULT IN A DOWNWARD TREND IN STORMS.

.SPOTTER INFORMATION STATEMENT...

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

WEATHER.GOV/TUCSON

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 6:49 PM MSTAreal Flood WarningTWCPima18 hr
Sep 9, 11:55 PM MSTAreal Flood AdvisoryTWCPima, Pinal3 hr
Sep 10, 1:27 PM MSTFlash Flood WarningTWCSanta Cruz2 hr
Sep 10, 1:37 PM MSTAreal Flood AdvisoryTWCCochise, Pima, Santa Cruz3 hr
Sep 10, 2:24 PM MSTFlash Flood WarningTWCCochise111 min
Sep 10, 2:29 PM MSTAreal Flood AdvisoryTWCPima3 hr
Sep 10, 2:41 PM MSTFlash Flood WarningTWCPima94 min
Sep 10, 3:40 PM MSTAreal Flood AdvisoryTWCCochise, Graham80 min
Sep 10, 3:44 PM MSTSpecial Weather StatementTWCPima46 min
Sep 10, 3:49 PM MSTSpecial Weather StatementTWCPima41 min
Sep 10, 3:53 PM MSTSevere Thunderstorm WarningTWCPima37 min
Sep 10, 3:54 PM MSTFlash Flood WarningTWCPima2 hr
Sep 10, 4:13 PM MSTFlash Flood WarningTWCPima, Santa Cruz2 hr
Sep 10, 4:24 PM MSTSevere Thunderstorm WarningTWCPima36 min
Sep 10, 4:56 PM MSTAreal Flood AdvisoryTWCGraham, Pinal112 min

Nearby

Areal Flood Warnings in Arizona, 2012Every areal flood warning in 2012

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.