Alert archive / Arizona / Mesoscale Discussions in 2021

Mesoscale Discussion 1800

October 5, 202110 counties in Arizona

The Storm Prediction Center issued this mesoscale discussion at Oct 5, 2021, 1:55 PM MST for 10 counties in Arizona. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
Oct 5, 2021, 1:55 PM MST (20:55 UTC)
Expired
Oct 5, 2021, 3:30 PM MST
In force
95 min
Issued by
the Storm Prediction Center
Concerning
Severe thunderstorm watch 512

Counties Coconino County, AZ, Gila County, AZ, Graham County, AZ, La Paz County, AZ, Maricopa County, AZ, Mohave County, AZ, Navajo County, AZ, Pinal County, AZ, Yavapai County, AZ, Yuma County, AZ

The radar

The Flagstaff radar (KFSX), 156 km from the middle of the area, began a volume at 20:55 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.9 hours before the alert went out and 141 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2021-10-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2021-10-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 121 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
986 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
121 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 5, 11:18 AM MSTMesoscale DiscussionSPCCoconino, La Paz, Maricopa, Mohave, Yavapai117 min
Oct 5, 11:46 AM MSTSevere Thunderstorm WatchSPCCoconino, Gila, Graham, La Paz, Maricopa, Mohave and 4 more8 hr
Oct 5, 3:53 PM MSTMesoscale DiscussionSPCCochise, Gila, Graham, Greenlee, Maricopa, Pima and 2 more97 min

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.