Alert archive / Arizona / Mesoscale Discussions in 2021
Mesoscale Discussion 1250
The Storm Prediction Center issued this mesoscale discussion at Jul 10, 2021, 6:55 PM MST for 6 counties in Arizona. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 10, 2021, 6:55 PM MST (01:55 UTC)
- Expired
- Jul 10, 2021, 9:00 PM MST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 369
Counties Gila County, AZ, Graham County, AZ, Maricopa County, AZ, Pima County, AZ, Pinal County, AZ, Santa Cruz County, AZ
The radar
The Phoenix radar (KIWA), 49 km from the middle of the area, began a volume at 01:58 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, 1.9 hours before the alert went out and 79 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.
- 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
The text
As transmitted.
453
ACUS11 KWNS 110155
SWOMCD
SPC MCD 110155
AZZ000-110400-
Mesoscale Discussion 1250
NWS Storm Prediction Center Norman OK
0855 PM CDT Sat Jul 10 2021
Areas affected...Central and southeastern Arizona
Concerning...Severe Thunderstorm Watch 369...
Valid 110155Z - 110400Z
The severe weather threat for Severe Thunderstorm Watch 369
continues.
SUMMARY...Storms continue to move off the higher terrain in central
and southeastern Arizona. Severe wind gusts are the primary threat
with these storms, though isolated large hail is also possible.
DISCUSSION...Storm coverage along the Mogollon Rim into southeastern
Arizona has increased early this evening. These clusters of storms
are expected to continue to move off the higher terrain and pose a
threat for severe winds gusts. The strongest gusts so far have
occurred in southeastern Arizona. The cluster is moving roughly
westward, the main portion of which may reach south of Tucson later
this evening. Additional development has occurred in northwestern
Cochise County and could impact western portions of Pima County as
well.
Northeast of Phoenix, a nearly contiguous line of thunderstorms
continues to move south/southwest off of the Mogollon Rim. Current
timing of the line suggest it may impact portions of the Phoenix
Metro between 9-10 PM MST. Severe wind gusts as well as isolated
large hail will be possible.
..Wendt.. 07/11/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...TWC...FGZ...PSR...
LAT...LON 33841262 34251190 34381122 33681005 32700977 32051014
31621048 31411098 31601146 32491237 33311274 33841262SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 1:23 PM MST | Severe Thunderstorm Watch | SPC | Cochise, Graham, Greenlee | 8 hr |
| Jul 11, 3:59 PM MST | Mesoscale Discussion | SPC | Gila, Yavapai | 2 hr |
Nearby
Mesoscale Discussions in Arizona, 2021Every mesoscale discussion 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.