Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Tucson, AZ

July 10, 2021

NWS Tucson, AZ issued this special weather statement at Jul 10, 2021, 9:45 PM MST. It was in force for 60 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 10, 2021, 9:45 PM MST (04:45 UTC)
Expired: Jul 10, 2021, 10:45 PM MST
In force: 60 min
Issued by: NWS Tucson, AZ

The radar

The Phoenix radar (KIWA), 152 km from the middle of the area, began a volume at 04:46 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

Phoenix, AZ (KPSR), launched 00:00Z, 4.8 hours before the alert went out and 151 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: 965 J/kg
Mixed-layer CIN: -311 J/kg
Mixed-layer LCL: 3378 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

099 
WWUS85 KTWC 110445
SPSTWC

Special Weather Statement
National Weather Service Tucson AZ
945 PM MST Sat Jul 10 2021
 
AZZ501-502-110545-
Western Pima County Including Ajo/Organ Pipe Cactus National
Monument-Tohono O'odham Nation including Sells-
945 PM MST Sat Jul 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PIMA COUNTY UNTIL
1045 PM MST...

At 944 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles west of Kaka to 12 miles southeast of
Pisinemo. Movement was west at 25 mph.

Half inch hail and wind gusts of 50 mph and blowing dust will be
possible with these storms.

Locations impacted include...
Ajo, Pisinemo, Gu Vo, Hickiwan, Organ Pipe Cactus National Monument,
Covered Wells, Ali Chugk, Gu Oidak, San Simon, Why, Charco 27,
Gunsight, Pia Oik, Vaya Chin, Santa Cruz, Mountain Village, Kuakatch,
Kupk, San Simon West and Lukeville.

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.

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.

&&

A Severe Thunderstorm Watch remains in effect until midnight MST for
southeastern Arizona.

LAT...LON 3251 11303 3249 11228 3191 11202 3178 11246
      3192 11294
TIME...MOT...LOC 0444Z 091DEG 23KT 3250 11248 3187 11223 

$$

What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 10, 2:00 PM MST, 7 hours 45 minutes earlier.

Area forecast discussion, Jul 10, 2:00 PM MST, 7 hours 45 minutes before

Area Forecast Discussion
National Weather Service Tucson AZ
200 PM MST Sat Jul 10 2021

.SYNOPSIS...

Southern Arizona will remain in an active pattern for isolated
thunderstorms and hot daytime highs for the next several days.
Impacts will include blowing dust, potential flash flooding and
gusty and erratic winds.

&&

.DISCUSSION...

Lots of sunshine has allowed energy to build across Southern Arizona
today, with Marana and Tucson already at 105 degrees each.

High resolution models have continued to point to an active late
afternoon start to isolated thunderstorm activity initiating off of
the Mogollon Rim. Some convection has already started in Northern
Greenlee County, moving swiftly southwestward. With PW values at
or above 1.5 inches, heavy localized rainfall will be one of the
main impacts to watch for the rest of today. Even with fast moving
storms, the flash flooding potential does remain, especially over
dry areas and existing burn scars. Additionally, due to the
potential for stronger updrafts and accompanying outflow, blowing
dust will be an issue for parts of Pinal and Pima County through
the evening hours. Therefore, in coordination with WFO Phoenix,
we've issued a Blowing Dust Advisory for those areas valid from
00-06 UTC.

Another interesting wrinkle is the HREF is highlighting areas near
the US/MX border with some interesting updraft helicity
probabilities. If storms do fire in those areas, close attention
will need to be paid to their structure.

Sunday brings another chance for isolated thunderstorm activity,
which will continue well into the middle of next week.

&&

.AVIATION...Valid through 12/00Z.
ISOLD-SCT SHRA/TSRA over the White Mountains this afternoon will
propagate to the southwest through late this evening. Best timing
for thunderstorms affecting KTUS is between 11/01z and 11/07z, and
KOLS between 02-06z. Wind gusts to 50 kts possible near the
strongest TSRA. Otherwise, surface winds less than 12 kts. Aviation
discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Isolated to scattered thunderstorms are again
possible today, forming off the Mogollon Rim this afternoon and
moving to the SW during the evening and overnight hours. Gusty
outflow winds will be the primary concern with these storms. Min RH
values will generally be in the 15-25 percent range for lower
elevations through Monday with very good overnight recoveries before
increasing Tuesday onward. Surface winds will be light and follow
normal daily trends when not influenced by storms.

&&

&&

.TWC WATCHES/WARNINGS/ADVISORIES...
Blowing Dust Advisory from 5 PM this afternoon to 11 PM MST this
evening for AZZ501-502-504>506.

&&

Public...Singer
Aviation...Dang
Fire Weather....Dang

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

In the hours before

Local storm report, Jul 10, 7:42 PM MST, 2 hours 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
742 PM MST SAT JUL 10 2021

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

0733 PM     TSTM WND GST     9 E TUCSON              32.19N 110.74W
07/10/2021  M73 MPH          PIMA               AZ   MESONET

            MESONET STATION CW6532 TUCSON FREEMAN/OLD
            SPANISH TRL.

&&

KJS

Local storm report, Jul 10, 7:54 PM MST, 1 hour 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
754 PM MST SAT JUL 10 2021

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

0752 PM     TSTM WND DMG     3 ESE TUCSON            32.18N 110.84W
07/10/2021                   PIMA               AZ   FIRE DEPT/RESCUE

            LARGE PALO VERDE TREE DOWN.

&&

KJS

Local storm report, Jul 10, 7:55 PM MST, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
755 PM MST SAT JUL 10 2021

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

0753 PM     TSTM WND DMG     2 E TUCSON              32.20N 110.86W
07/10/2021                   PIMA               AZ   FIRE DEPT/RESCUE

            LARGE PALO VERDE TREE DOWN BLOCKING 2 LANES.

&&

KJS

Local storm report, Jul 10, 8:10 PM MST, 1 hour 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
810 PM MST SAT JUL 10 2021

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

0743 PM     TSTM WND GST     9 E TUCSON              32.19N 110.74W
07/10/2021  M76 MPH          PIMA               AZ   MESONET

            MESONET STATION CW6532 TUCSON FREEMAN/OLD
            SPANISH TRL.

&&

KJS

Local storm report, Jul 10, 9:19 PM MST, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON AZ
919 PM MST SAT JUL 10 2021

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

0758 PM     TSTM WND GST     2 SE TUCSON             32.17N 110.87W
07/10/2021  M64 MPH          PIMA               AZ   ASOS

            ASOS STATION KDMA DAVIS MONTHAN AFB.

&&

KJS

Special weather statement, Jul 10, 9:45 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Tucson AZ
945 PM MST Sat Jul 10 2021

AZZ501-502-110545-
Western Pima County Including Ajo/Organ Pipe Cactus National
Monument-Tohono O'odham Nation including Sells-
945 PM MST Sat Jul 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PIMA COUNTY UNTIL
1045 PM MST...

At 944 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles west of Kaka to 12 miles southeast of
Pisinemo. Movement was west at 25 mph.

Half inch hail and wind gusts of 50 mph and blowing dust will be
possible with these storms.

Locations impacted include...
Ajo, Pisinemo, Gu Vo, Hickiwan, Organ Pipe Cactus National Monument,
Covered Wells, Ali Chugk, Gu Oidak, San Simon, Why, Charco 27,
Gunsight, Pia Oik, Vaya Chin, Santa Cruz, Mountain Village, Kuakatch,
Kupk, San Simon West and Lukeville.

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.

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.

&&

A Severe Thunderstorm Watch remains in effect until midnight MST for
southeastern Arizona.

LAT...LON 3251 11303 3249 11228 3191 11202 3178 11246
      3192 11294
TIME...MOT...LOC 0444Z 091DEG 23KT 3250 11248 3187 11223

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 5:10 PM MST	Flash Flood Warning	TWC	Cochise	2 hr
Jul 10, 5:14 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	61 min
Jul 10, 5:15 PM MST	Severe Thunderstorm Warning	TWC	Cochise	45 min
Jul 10, 5:23 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	52 min
Jul 10, 5:30 PM MST	Severe Thunderstorm Warning	TWC	Cochise	60 min
Jul 10, 5:42 PM MST	Flash Flood Warning	TWC	Santa Cruz	2 hr
Jul 10, 5:46 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima, Santa Cruz	59 min
Jul 10, 6:05 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	40 min
Jul 10, 6:13 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	26 min
Jul 10, 6:22 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	53 min
Jul 10, 6:50 PM MST	Special Weather Statement	TWC		25 min
Jul 10, 6:57 PM MST	Dust Storm Warning	TWC	Pima, Santa Cruz	63 min
Jul 10, 6:57 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	48 min
Jul 10, 7:06 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	39 min
Jul 10, 7:07 PM MST	Dust Storm Warning	TWC	Pima, Pinal	83 min
Jul 10, 7:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Jul 10, 7:29 PM MST	Flash Flood Warning	TWC	Cochise, Pima	2 hr
Jul 10, 7:35 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	55 min
Jul 10, 8:00 PM MST	Dust Storm Warning	TWC	Pima, Pinal	86 min
Jul 10, 8:06 PM MST	Severe Thunderstorm Warning	TWC	Pima	39 min
Jul 10, 8:12 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Jul 10, 8:22 PM MST	Flash Flood Warning	TWC	Pima	113 min
Jul 10, 8:29 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Jul 10, 8:40 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	66 min
Jul 10, 8:41 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 10, 8:48 PM MST	Areal Flood Advisory	TWC	Pima	117 min
Jul 10, 8:51 PM MST	Areal Flood Advisory	TWC	Pima	114 min
Jul 10, 8:51 PM MST	Tornado Warning	TWC	Pima	14 min
Jul 10, 10:03 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Jul 10, 10:20 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 10, 10:36 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 11, 4:12 PM MST	Special Weather Statement	TWC	Greenlee	33 min
Jul 11, 4:44 PM MST	Special Weather Statement	TWC	Greenlee	46 min

Nearby

Special Weather Statements in Arizona, 2021 Every special weather statement in 2021

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.