Alert archive / Arizona / Areal Flood Warnings in 2018

Areal Flood Warning 2, NWS Tucson, AZ

August 13, 2018Pima County, Arizona

NWS Tucson, AZ issued this areal flood warning at Aug 13, 2018, 12:00 AM MST for Pima County, Arizona. It was in force for 15 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
Aug 13, 2018, 12:00 AM MST (07:00 UTC)
Expired
Aug 13, 2018, 2:45 PM MST
In force
15 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 07:01 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

Tuscon, AZ (KDMA), launched 00:00Z, 7.0 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, Tuscon, AZ at 00:00Z on 2018-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 289 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 00:00Z on 2018-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 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
289 J/kg
Mixed-layer CIN
-66 J/kg
Mixed-layer LCL
2698 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
16 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 Aug 12, 9:46 PM MST, 2 hours 14 minutes earlier.

Area forecast discussion, Aug 12, 9:46 PM MST, 2 hours 14 minutes before
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In the hours before

Special weather statement, Aug 12, 6:59 PM MST, 5 hours 1 minute before
Special Weather Statement
National Weather Service Tucson AZ
659 PM MST SUN AUG 12 2018

AZZ503-504-507-513-130300-
Upper San Pedro River Valley including Sierra
Vista/Benson-Dragoon/Mule/Huachuca and Santa Rita Mountains including
Bisbee/Canelo Hills/Madera Canyon-Upper Santa Cruz River and Altar
Valleys including Nogales-Tucson Metro Area including Tucson/Green
Valley/Marana/Vail-
659 PM MST SUN AUG 12 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PIMA AND SANTA CRUZ
COUNTIES UNTIL 800 PM MST...

At 657 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from southeast of Green Valley to near the Sonoita
and Patagonia areas. Movement was southwest at 20 mph.

Winds in excess of 40 mph and blowing dust will be possible with
these storms, with heavy rain following the blowing dust.

Locations impacted include...
Nogales, Rio Rico, Tubac, Tumacacori-Carmen, Patagonia, Amado, Pena
Blanca Lake, Tumacacori, Sonoita, Lochiel, Kino Springs, Madera
Canyon, Patagonia Lake, Arivaca Junction and Elgin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with these storms, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3166 11135 3186 11086 3169 11064 3144 11052
      3133 11062 3133 11105
TIME...MOT...LOC 0157Z 035DEG 16KT 3180 11093 3155 11067

Meyer
Local storm report, Aug 12, 7:29 PM MST, 4 hours 31 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
729 PM MST SUN AUG 12 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0655 PM     DUST STORM       7 SSW AVRA VALLEY       32.35N 111.37W
08/12/2018                   PIMA               AZ   TRAINED SPOTTER

            SPOTTER REPORTED 1/2 MILE VISIBILITY IN
            DUST.

&&
Special weather statement, Aug 12, 7:45 PM MST, 4 hours 15 minutes before
Special Weather Statement
National Weather Service Tucson AZ
745 PM MST SUN AUG 12 2018

AZZ501>504-515-130345-
Tohono O'odham Nation including Sells-Western Pima County Including
Ajo/Organ Pipe Cactus National Monument-Upper Santa Cruz River and
Altar Valleys including Nogales-Baboquivari Mountains including Kitt
Peak-Tucson Metro Area including Tucson/Green Valley/Marana/Vail-
745 PM MST SUN AUG 12 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PIMA AND
SOUTHWESTERN PINAL COUNTIES UNTIL 845 PM MST...

At 742 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 25 miles east of Ajo to 6 miles southwest of
Santa Rosa to 9 miles northeast of Sells to near Three Points.
Movement was west and southwest at 20 mph.

Winds in excess of 40 mph and blowing dust will be possible with
these storms. The dust will be followed by areas of heavy rain.

Locations impacted include...
Sells, Ajo, Three Points, Kitt Peak, Santa Rosa, Santa Cruz, San
Luis, Kuakatch, Pisinemo, Pan Tak, Covered Wells, Big Fields,
Gunsight, Fresnal Canyon, San Isidro, Vaya Chin and Santa Rosa Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with these storms, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM MST for
areas immediately north of the advisory area.

LAT...LON 3249 11301 3251 11293 3251 11221 3265 11220
      3267 11211 3228 11174 3206 11113 3176 11160
      3201 11261
TIME...MOT...LOC 0242Z 065DEG 19KT 3254 11225 3224 11209 3205 11181
3199 11132

Meyer
Special weather statement, Aug 12, 9:06 PM MST, 2 hours 54 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 5:05 PM MSTSevere Thunderstorm WarningTWCPinal55 min
Aug 12, 5:42 PM MSTDust Storm WarningTWCPima, Pinal93 min
Aug 12, 5:57 PM MSTSpecial Weather StatementTWCSanta Cruz48 min
Aug 12, 5:58 PM MSTSevere Thunderstorm WarningTWCPima, Pinal52 min
Aug 12, 6:38 PM MSTSevere Thunderstorm WarningTWCPima52 min
Aug 12, 6:59 PM MSTSpecial Weather StatementTWCSanta Cruz61 min
Aug 12, 7:07 PM MSTSevere Thunderstorm WarningTWCPima, Pinal38 min
Aug 12, 7:09 PM MSTAreal Flood WarningTWCPima39 min
Aug 12, 7:45 PM MSTSpecial Weather StatementTWCPima60 min
Aug 12, 8:35 PM MSTDust Storm AdvisoryTWCPima55 min
Aug 12, 8:44 PM MSTSevere Thunderstorm WarningTWCPima46 min
Aug 12, 9:06 PM MSTSpecial Weather StatementTWC39 min

Nearby

Areal Flood Warnings in Arizona, 2018Every areal flood warning in 2018

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.