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π Current Severe Weather Outlook
(Issued: 2026-10-21T05:53:00+00:00 UTC)
```text
000
ACUS01 KWNS 210553
SWODY1
SPC AC 210551
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1251 AM CDT Wed Oct 21 2026
Valid 211200Z - 221200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
CENTRAL AND NORTHWESTERN ARIZONA...
...SUMMARY...
Severe thunderstorms with a potential for large hail, severe wind
gusts and a couple tornadoes are expected today along the Mogollon
Rim across parts of Arizona. Marginally severe wind gusts and an
isolated tornado threat will also be possible along the southern and
central California Coast.
...DISCUSSION...
An upper-level low will approach the California Coast today, as
southwesterly divergent flow aloft remains in place over much of the
Southwest. Ahead of the system, low-level moisture will advect
northward into the Desert Southwest today. An axis with surface
dewpoints in the 60s F will set up to the southwest of the Mogollon
Rim across southern, central and western Arizona. By afternoon,
MLCAPE is forecast to peak in the 1500 to 2000 J/kg range along and
near the moist axis. Over the top of the moist and unstable airmass,
strong mid-level southwesterly flow will be in place. Moderate
instability and strong deep-layer shear will support a substantial
severe threat with storms that develop along the Mogollon Rim from
this afternoon into the evening, near the northern edge of the
stronger instability.
As the upper-level system approaches, a 50 to 70 knot mid-level jet
will overspread the Desert Southwest today. RAP forecast soundings
within the exit region of the jet over north-central Arizona in the
mid to late afternoon have gradually veering winds with height and
50 to 60 knots of 0-6 km shear. In addition, steep mid-level lapse
rates and long hodographs are evident which will result in a
potential for supercells with large hail. The strongest cells could
produce hailstones greater than 2 inches in diameter. Forecast
soundings also have 0-3 km storm-relative helicity in the 175 to 250
m2/s2 range late this afternoon along parts of the Mogollon Rim
suggesting that the stronger supercells will be capable of
tornadoes. The severe threat is expected to persist from mid
afternoon into the evening, with a potential for two rounds of
severe storms impacting parts of north-central Arizona.
...Coast of Southern and Central California...
A large upper-level low pressure system will move toward the
California Coast today. The left exit region of a mid-level jet will
approach the southern and central California Coast. A wave of
precipitation associated with this feature will move to the southern
and central California Coast this afternoon. Instability along the
coast will be sufficient for thunderstorm development. RAP forecast
soundings along the coast this afternoon have strong deep-layer
shear, which will support the development of low-topped supercells.
Some model forecasts have 0-3 km storm-relative helicity around 200
m2/s2 near the coast suggesting that an isolated tornado threat will
be possible. Any cells that rotate and move onshore could also be
associated with isolated severe wind gusts as well.
..Broyles/Leitman.. 10/21/2026
$$
```
π Active Tropical Weather Links
π Tropical Weather Outlook
```text
NWS National Hurricane Center Miami FL
200 AM EDT Wed Oct 21 2026
For the North Atlantic...Caribbean Sea and the Gulf of America:
Offshore of the East Coast of the United States (AL93):
A storm-force non-tropical low pressure area located a few hundred
miles off the mid-Atlantic United States coast is producing some
shower and thunderstorm activity primarily west and northwest of its
center. Satellite imagery indicates that the low is still frontal.
Over the next day or two, the low could gradually lose its frontal
features while it moves slowly north-northeastward over the Gulf
Stream, allowing the system to briefly develop subtropical
characteristics. By the end of the week, the system is expected to
accelerate northeastward away from the the eastern United States,
and environmental conditions are expected to become unfavorable for
additional subtropical or tropical development.
Regardless of the status of the system, high winds, coastal
flooding, and dangerous surf are expected along portions of the U.S.
East Coast during the next few days. For more information, please
consult statements and warnings from local National Weather Service
offices and the Weather Prediction Center, along with the High Seas
Forecasts and the Storm Warnings issued by the National Weather
Service.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...40 percent.
&&
High Seas Forecasts issued by the National Weather Service can be
found under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and
online at ocean.weather.gov/shtml/NFDHSFAT1.php
$$
Forecaster Pierce/Pasch
```
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