Alert archive / Arizona / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 11, NWS Tucson, AZ

July 9, 2018Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 9, 2018, 2:22 PM MST for Pinal County, Arizona. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 9, 2018, 2:22 PM MST (21:22 UTC)
Expired: Jul 9, 2018, 3:01 PM MST
In force: 39 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 70 km from the middle of the area, began a volume at 21:26 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Tuscon, AZ (KDMA), launched 12:00Z, 9.4 hours before the alert went out and 76 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: 736 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1591 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

657 
WUUS55 KTWC 092122
SVRTWC
AZC021-092215-
/O.NEW.KTWC.SV.W.0011.180709T2122Z-180709T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
222 PM MST MON JUL 9 2018

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Central Pinal County in southeastern Arizona...

* Until 315 PM MST.

* At 222 PM MST, Doppler radar indicated a severe thunderstorm
  capable of producing quarter size hail and damaging winds in excess
  of 60 mph. This storm was located 16 miles southeast of Coolidge
  Airport, or 19 miles southeast of Florence, and moving west at 10
  mph.

* This severe thunderstorm will remain over mainly remote areas of
  central Pinal County.
  This includes Route 79 between mile markers 104 and 122.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Severe thunderstorms produce damaging winds, large hail, deadly
lightning and very heavy rain. For your protection, move to an
interior room on the lowest floor of your home or business. Heavy
rains flood roads quickly so do not drive into areas where water
covers the road.

&&

LAT...LON 3294 11110 3273 11097 3261 11128 3285 11147
TIME...MOT...LOC 2122Z 085DEG 9KT 3280 11118 

$$

GL

2 follow-up statements

024 
WWUS55 KTWC 092146
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
246 PM MST MON JUL 9 2018

AZC021-092215-
/O.CON.KTWC.SV.W.0011.000000T0000Z-180709T2215Z/
Pinal-
246 PM MST MON JUL 9 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM MST
FOR CENTRAL PINAL COUNTY...

At 245 PM MST, a severe thunderstorm was located 12 miles southeast
of Coolidge Airport, or 16 miles southeast of Florence, moving west
at 10 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

This severe thunderstorm will remain over mainly remote areas of
central Pinal County.

This includes Route 79 between mile markers 104 and 122.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3294 11110 3273 11097 3261 11128 3285 11147
TIME...MOT...LOC 2145Z 100DEG 8KT 3283 11124 

HAIL...0.75IN
WIND...60MPH
 
$$

GL

538 
WWUS55 KTWC 092201
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
301 PM MST MON JUL 9 2018

AZC021-092211-
/O.CAN.KTWC.SV.W.0011.000000T0000Z-180709T2215Z/
Pinal-
301 PM MST MON JUL 9 2018

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL PINAL COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

LAT...LON 3294 11110 3273 11097 3261 11128 3285 11147
TIME...MOT...LOC 2153Z 085DEG 9KT 3283 11129 

$$

GL

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 9, 2:00 PM MST, 22 minutes earlier.

Area forecast discussion, Jul 9, 2:00 PM MST, 22 minutes before

Area Forecast Discussion
National Weather Service Tucson AZ
200 PM MST Mon Jul 9 2018

.SYNOPSIS...Plentiful moisture will remain over the region through
next weekend resulting in multiple rounds of thunderstorms and
showers. Some Thunderstorms will generate strong winds and heavy
rainfall. Due to the increase in clouds and showers, temperatures
will run several degrees below normal through the week.

&&

.DISCUSSION...A favorable flow pattern and deep moisture needed for
thunderstorms will remain in place this week. Already starting to
see scattered showers and thunderstorms across the area this
afternoon as an upper low/inverted trough was aiding in the
development today. Strong thunderstorm winds and locally heavy
rainfall will be the main concerns through this evening. The upper
low/inverted trough will track westward helping sustain showers and
thunderstorms overnight tonight. The inverted trough should be
extending over western Arizona by tomorrow afternoon with the
steering flow becoming more southerly over the area. The combination
of anticipated cloudiness, some lingering showers, and the position
of the trough axis should delay the redevelopment of thunderstorms
on Tuesday. Another upper low centered over central Oklahoma will
drift westward tonight and Tuesday, complicating the flow pattern a
bit Wednesday into Friday. Overall, though, the large scale pattern
will favor daily showers and thunderstorms with day-to-day
variations in the area of most activity. Otherwise, rain chances and
cloudiness will help keep daytime temperatures a few degrees below
normal this week.

&&

.AVIATION...Valid through 11/00Z.
Scattered -TSRA/-SHRA this afternoon into this evening with storms
propagating to the west. Additional area of -SHRA/TS later tonight
into early Tuesday morning mainly east of KTUS. In the late
morning/early afternoon Tuesday expect another round of -TSRA/-SHRA
area wide. Clouds will be SCT-BKN at 8k-10k ft AGL with BKN clouds
above 20k ft AGL. Occasional MVFR ceilings near -TSRA with gusts up
to 45 kts possible. Outside of thunderstorm winds, sfc winds will be
out of the east/southeast at 8-15 kts with some afternoon gusts.
Aviation discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Moisture will remain high during the next 7 days.
Scattered showers and thunderstorms area-wide each day with storms
lingering into the overnight hours. 20 ft surface winds will
generally be 15 mph or less from an easterly direction through
Tuesday, and thereafter follow a more typical diurnal pattern. In
the vicinity of thunderstorms expect strong and variable winds.

&&

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

&&

Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson

In the hours before

Local storm report, Jul 9, 9:41 AM MST, 4 hours 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
941 AM MST MON JUL 9 2018

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

0715 PM     TSTM WND DMG     13 SE AJO               32.24N 112.73W
07/08/2018                   PIMA               AZ   EMERGENCY MNGR

            RV DAMAGED SOUTHEAST OF WHY, AZ.

0700 PM     TSTM WND DMG     16 SE AJO               32.22N 112.69W
07/08/2018                   PIMA               AZ   EMERGENCY MNGR

            ROOF DAMAGED TO HOME AT GUNSIGHT VILLAGE.

&&

Local storm report, Jul 9, 9:48 AM MST, 4 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE TUCSON AZ
948 AM MST MON JUL 9 2018

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

0630 PM     TSTM WND DMG     2 SSE ORO VALLEY        32.40N 110.95W
07/08/2018                   PIMA               AZ   NWS EMPLOYEE

            REPORTS OF TREES DOWN AT 1ST AND ORACLE IN
            ORO VALLEY.

0633 PM     TSTM WND DMG     2 SSE ORO VALLEY        32.40N 110.95W
07/08/2018                   PIMA               AZ   NWS EMPLOYEE

            REPORT OF TREES DOWN AT 1ST AND ORACLE IN
            ORO VALLEY.

0700 PM     TSTM WND DMG     16 SE AJO               32.22N 112.69W
07/08/2018                   PIMA               AZ   EMERGENCY MNGR

            ROOF DAMAGED TO HOME AT GUNSIGHT VILLAGE.

0701 PM     TSTM WND DMG     5 SW ORO VALLEY         32.38N 111.03W
07/08/2018                   PIMA               AZ   PUBLIC

            TREE DOWN ON PROPERTY NEAR OVERTON ROAD AND
            SHANNON ROAD IN ORO VALLEY.

0715 PM     TSTM WND DMG     13 SE AJO               32.24N 112.73W
07/08/2018                   PIMA               AZ   EMERGENCY MNGR

            RV DAMAGED SOUTHEAST OF WHY, AZ.

0718 PM     FLASH FLOOD      7 WSW ORO VALLEY        32.38N 111.06W
07/08/2018                   PIMA               AZ   PUBLIC

            SEVERAL INCHES OF FAST MOVING WATER FLOWING
            ACROSS THE ROAD AT SNOW LEOPARD DR AND
            CAMINO DE OESTE.

0740 PM     FLASH FLOOD      5 SW ORO VALLEY         32.37N 111.02W
07/08/2018                   PIMA               AZ   TRAINED SPOTTER

            SEVERAL INCHES OF WATER FLOWING ACROSS
            ROADWAY NEAR OVERTON ROAD AND LA CHOLLA
            BLVD.

&&

KD

Special weather statement, Jul 9, 12:51 PM MST, 1 hour 31 minutes before

Special Weather Statement
National Weather Service Tucson AZ
1251 PM MST MON JUL 9 2018

AZZ504>506-092030-
Southeast Pinal County including Kearny/Mammoth/Oracle-Tucson Metro
Area including Tucson/Green Valley/Marana/Vail-South Central Pinal
County including Eloy/Picacho Peak State Park-
1251 PM MST MON JUL 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PIMA AND
SOUTHEASTERN PINAL COUNTIES UNTIL 130 PM MST...

At 1249 PM MST, Doppler radar was tracking a strong thunderstorm near
Tortolita, or 7 miles northwest of Oro Valley, moving southwest at 10
mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Marana, Tortolita, Casas Adobes, Avra Valley, Picture Rocks, and
Dove Mountain.

LAT...LON 3258 11112 3251 11092 3223 11107 3234 11136
TIME...MOT...LOC 1949Z 027DEG 10KT 3248 11107

HARDIN

Special weather statement, Jul 9, 1:17 PM MST, 1 hour 5 minutes before

Special Weather Statement
National Weather Service Tucson AZ
117 PM MST MON JUL 9 2018

AZZ502-503-515-092100-
Tohono O'odham Nation including Sells-Upper Santa Cruz River and
Altar Valleys including Nogales-Baboquivari Mountains including Kitt
Peak-
117 PM MST MON JUL 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL PIMA COUNTY UNTIL
200 PM MST...

At 114 PM MST, Doppler radar was tracking a line of strong
thunderstorms from south of Kitt Peak to Newfield along the
International Border. This line of storms was moving west
at 20 mph.

Wind gusts up to 50 mph will be possible with this line of
thunderstorms.

Locations impacted include...
Kitt Peak, Topawa, South Komelik, Sasabe, San Miguel, Junction Of
Highway 286 And Arivaca Road, Little Tucson, Choulic, Fresnal Canyon
and Vamori.

LAT...LON 3188 11132 3147 11148 3163 11195 3199 11178
      3202 11148
TIME...MOT...LOC 2014Z 097DEG 16KT 3173 11152

Zell

Special weather statement, Jul 9, 2:12 PM MST, 10 minutes before

Special Weather Statement
National Weather Service Tucson AZ
212 PM MST MON JUL 9 2018

AZZ502-503-515-092215-
Tohono O'odham Nation including Sells-Upper Santa Cruz River and
Altar Valleys including Nogales-Baboquivari Mountains including Kitt
Peak-
212 PM MST MON JUL 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PIMA COUNTY UNTIL 315 PM
MST...

At 210 PM MST, Doppler radar was tracking a line of strong
thunderstorms from Kitt Peak south to the International Border. This
line of thunderstorms was moving west at 20 mph.

Wind gusts of 50 mph and blowing dust will be possible with this
storm.

Locations impacted include...
Sells, Kitt Peak, Santa Rosa Ranch, Little Tucson, Pan Tak, Vamori,
Topawa, South Komelik, Big Fields, San Miguel, Cowlic, Artesa,
Choulic, Comobabi, Nolic, Fresnal Canyon and San Isidro.

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.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3196 11155 3154 11169 3170 11218 3214 11207
      3216 11153
TIME...MOT...LOC 2110Z 086DEG 16KT 3185 11169

Zell

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 5:33 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Jul 8, 6:16 PM MST	Severe Thunderstorm Warning	TWC	Pima	59 min
Jul 8, 6:18 PM MST	Special Weather Statement	TWC		42 min
Jul 8, 6:30 PM MST	Severe Thunderstorm Warning	TWC	Pima	45 min
Jul 8, 6:46 PM MST	Areal Flood Advisory	TWC	Pima	89 min
Jul 8, 7:13 PM MST	Severe Thunderstorm Warning	TWC	Pima	34 min
Jul 8, 7:32 PM MST	Flash Flood Warning	TWC	Pima	58 min
Jul 8, 7:43 PM MST	Special Weather Statement	TWC	Pima	62 min
Jul 8, 8:35 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 8, 8:58 PM MST	Dust Storm Warning	TWC	Pinal	47 min
Jul 8, 9:20 PM MST	Dust Storm Warning	TWC	Pima	85 min
Jul 8, 10:44 PM MST	Dust Storm Warning	TWC	Pima	61 min
Jul 9, 12:51 PM MST	Special Weather Statement	TWC		39 min
Jul 9, 1:11 PM MST	Severe Thunderstorm Warning	TWC	Pinal	38 min
Jul 9, 1:17 PM MST	Special Weather Statement	TWC	Pima	43 min
Jul 9, 2:12 PM MST	Special Weather Statement	TWC	Pima	63 min
Jul 9, 2:17 PM MST	Severe Thunderstorm Warning	TWC	Pima	43 min
Jul 9, 2:52 PM MST	Dust Storm Advisory	TWC	Pima	3 hr
Jul 9, 2:57 PM MST	Dust Storm Advisory	TWC	Pinal	63 min
Jul 9, 2:59 PM MST	Severe Thunderstorm Warning	TWC	Pima	14 min
Jul 9, 3:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Jul 9, 3:20 PM MST	Special Weather Statement	TWC		25 min
Jul 9, 3:54 PM MST	Special Weather Statement	TWC		51 min
Jul 9, 4:25 PM MST	Dust Storm Advisory	TWC	Pima, Pinal	50 min
Jul 9, 4:28 PM MST	Areal Flood Advisory	TWC	Pima	62 min
Jul 9, 4:49 PM MST	Severe Thunderstorm Warning	TWC	Pinal	41 min
Jul 9, 4:50 PM MST	Areal Flood Advisory	TWC	Pinal	55 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2018 Every severe thunderstorm 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.