Alert archive / Arizona / Areal Flood Warnings in 2015

Areal Flood Warning 2, NWS Tucson, AZ

July 18, 2015Pima County, Arizona

NWS Tucson, AZ issued this areal flood warning at Jul 18, 2015, 10:20 PM MST for Pima County, Arizona. It was in force for 9 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: Jul 18, 2015, 10:20 PM MST (05:20 UTC)
Expired: Jul 19, 2015, 7:15 AM MST
In force: 9 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 05:22 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

Phoenix, AZ (KPSR), launched 00:00Z, 5.3 hours before the alert went out and 149 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: 346 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1615 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 39 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 Tucson, AZ wrote its last area forecast discussion before this areal flood warning went out at Jul 18, 9:30 PM MST, 50 minutes earlier.

Area forecast discussion, Jul 18, 9:30 PM MST, 50 minutes before

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In the hours before

Special weather statement, Jul 18, 5:21 PM MST, 4 hours 59 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
521 PM MST SAT JUL 18 2015

AZZ501-190100-
WESTERN PIMA COUNTY INCLUDING AJO/ORGAN PIPE CACTUS NATIONAL MONUMENT
AZ-
521 PM MST SAT JUL 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PIMA COUNTY UNTIL
600 PM MST...

AT 519 PM MST...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR AJO TO THE BORDER
WITH YUMA COUNTY...AND MOVING NORTH AT 5 TO 10 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 45 MPH WILL BE POSSIBLE WITH
THESE STORMS...ALONG WITH VERY HEAVY RAIN.

LOCATIONS IMPACTED INCLUDE...
AJO...HIGHWAY 85 NEAR AJO...AND REMOTE AREAS WEST OF AJO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3250 11333 3250 11270 3224 11281 3225 11333
TIME...MOT...LOC 0019Z 190DEG 10KT 3235 11289 3240 11328

MEYER

Special weather statement, Jul 18, 6:01 PM MST, 4 hours 19 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 5:21 PM MST	Special Weather Statement	TWC		39 min
Jul 18, 5:46 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 18, 6:01 PM MST	Special Weather Statement	TWC		44 min
Jul 19, 4:59 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	61 min

Nearby

Areal Flood Warnings in Arizona, 2015 Every areal flood warning in 2015

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.