Flash Flood Warning 42, NWS Tucson, AZ

630 
WGUS75 KTWC 220037
FFSTWC

Flash Flood Statement
National Weather Service Tucson AZ
537 PM MST SUN OCT 21 2018

AZC019-220130-
/O.CON.KTWC.FF.W.0042.000000T0000Z-181022T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Pima-
537 PM MST SUN OCT 21 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MST FOR
EAST CENTRAL PIMA COUNTY...

At 530 PM MST, Doppler radar continued to indicate thunderstorms 
producing heavy rain across east central Pima county, from Green 
Valley to Sahuarita to Corona De Tucson. Radar estimated rainfall 
from this area indicates that over 3 inches of rainfall has 
occurred, with an observation site in Sahuarita reporting 3.28 
inches.  

Some locations that will experience flooding include...
Green Valley, Sahuarita, East Sahuarita, Summit and Corona De Tucson.

This includes the following highways...
 Interstate 10 between mile markers 272 and 273.
 Interstate 19 between mile markers 39 and 55.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

&&

LAT...LON 3210 11081 3190 11074 3182 11110 3207 11111

$$
Zell

Area Forecast Discussion
National Weather Service Tucson AZ
220 PM MST Sun Oct 21 2018

.SYNOPSIS...There is a chance of showers and thunderstorms through
at least Tuesday as a trough of low pressure moves slowly across the
area. Gusty winds will continue into Monday. Temperatures will
hover within a few degrees of normal through the forecast period.

&&

.DISCUSSION...Convective active starting to slowly increase across
the areas we talked about in the morning discussion. That is
across southeast Pinal, eastern half of Pima county and Santa Cruz
county. PW values across the area ranged from 0.50" across the
White mountains to 1.0" from Tucson south. Taking a closer look at
the CIRA layered PW, there is a distinct boundary in the 700-500
mb layer than extends from north of Las Vegas to Prescott to
Phoenix and then south into central Pima county. SPC continues to
have the central part of the forecast area under Marginal risk
for isolated severe storms with main threats being large hail,
strong gusty winds, areas of blowing dust and localized heavy
rain. Activity will be moving into eastern zones this evening
with a slight chance of a storm during the overnight hours.

All of this is associated with an upper low off the central
California coast. This feature will gradually move east across the
desert southwest next 48-60 hours keeping unsettled conditions
across most of the forecast area into Wednesday. Upper level trof
axis east of the area late Wednesday into early Thursday. Still
enough residual moisture along AZ/NM border on Thursday for a
slight chance of showers. Thereafter high pressure aloft will
build over the area bringing dry conditions and warmer daytime
temperatures next weekend.

Highs temperatures through Thursday will be at or a few degrees
below normal then turning warmer next weekend. At this time I may
not be warm enough on Sat/Sun. Plenty of time to make adjustments.

&&

.AVIATION...Valid through 23/00Z.
SCT-BKN clouds 5-8k ft AGL throughout the forecast period with
scattered to numerous SHRA and isolated TSRA through about 22/02Z
with more SHRA activity decreasing in coverage overnight. Increased
SHRA/TSRA development possible again Monday afternoon. Surface winds
ELY/SELY 10-15 kts gusting up to 25 kts through about 22/00Z,
gradually easing during the evening hours and becoming 12 kts or
less through Monday. Higher wind gusts also possible near TSRA.
Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Gusty east to southeast winds 15-25 mph currently
will decrease into this evening. A slow moving upper-level trough
will result in scattered to numerous showers and thunderstorms
this afternoon and continuing into early Wednesday as the system
exits. The greatest shower and thunderstorm coverage will exist
from Tucson eastward with dry conditions for the western deserts.
Thereafter, primarily dry weather settling in for Thursday and
beyond. Winds decrease on Monday remaining below 15 mph through
the rest of the forecast period.

&&

.TWC WATCHES/WARNINGS/ADVISORIES...None.

&&

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Special Weather Statement
National Weather Service Tucson AZ
220 PM MST SUN OCT 21 2018

AZZ502>504-515-212200-
Tohono O'odham Nation including Sells-Upper Santa Cruz River and
Altar Valleys including Nogales-Baboquivari Mountains including Kitt
Peak-Tucson Metro Area including Tucson/Green Valley/Marana/Vail-
220 PM MST SUN OCT 21 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PIMA COUNTY UNTIL
300 PM MST...

At 219 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles north of Kitt Peak to 10 miles
southwest of Three Points to 10 miles west of Green Valley. Movement
was northeast at 20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Tucson, Marana, Green Valley, Sahuarita, East Sahuarita, Drexel
Heights, Summit, Tucson Estates, Avra Valley, Three Points, Valencia
West, Littletown, Drexel-Alvernon, South Tucson, Ryan Field, San
Pedro, Saguaro National Park West, San Xavier Mission, Picture Rocks
and Tucson International Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3249 11138 3221 11099 3204 11076 3174 11116
      3188 11145 3217 11168
TIME...MOT...LOC 2119Z 219DEG 15KT 3211 11154 3193 11135 3185 11119

GL

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
245 PM MST SUN OCT 21 2018

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

0243 PM     HAIL             3 S THREE POINTS        32.03N 111.27W
10/21/2018  E1.00 INCH       PIMA               AZ   TRAINED SPOTTER

            SPOTTER REPORTED ONE INCH HAIL NEAR THREE
            POINTS.

&&

AH

Special Weather Statement
National Weather Service Tucson AZ
259 PM MST SUN OCT 21 2018

AZZ506-511-212245-
Southeast Pinal County including Kearny/Mammoth/Oracle-Galiuro and
Pinaleno Mountains including Mount Graham-
259 PM MST SUN OCT 21 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PINAL COUNTY UNTIL
345 PM MST...

At 258 PM MST, Doppler radar was tracking a strong thunderstorm over
near Mammoth, moving northeast at 20 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Mammoth and San Manuel.

LAT...LON 3256 11065 3271 11075 3294 11046 3259 11046
TIME...MOT...LOC 2158Z 240DEG 18KT 3271 11061

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
403 PM MST SUN OCT 21 2018

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

0305 PM     HAIL             9 NNE GREEN VALLEY      31.97N 110.97W
10/21/2018  E1.50 INCH       PIMA               AZ   BROADCAST MEDIA

            TIME ESTIMATE BASED ON RADAR.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
425 PM MST SUN OCT 21 2018

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

0355 PM     HAIL             11 W HUACHUCA CITY      31.66N 110.52W
10/21/2018  M1.00 INCH       SANTA CRUZ         AZ   PUBLIC

            MEMBER OF THE PUBLIC REPORTED ONE INCH HAIL
            IN ELGIN.

&&

AH