Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

July 21, 2021

NWS Flagstaff, AZ issued this special weather statement at Jul 21, 2021, 2:30 PM MST. It was in force for 45 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 21, 2021, 2:30 PM MST (21:30 UTC)
Expired: Jul 21, 2021, 3:15 PM MST
In force: 45 min
Issued by: NWS Flagstaff, AZ

The radar

The Flagstaff radar (KFSX), 122 km from the middle of the area, began a volume at 21:34 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, 9.5 hours before the alert went out and 41 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: 77 J/kg
Mixed-layer CIN: -129 J/kg
Mixed-layer LCL: 1785 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: -11 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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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 Flagstaff, AZ wrote its last area forecast discussion before this special weather statement went out at Jul 21, 2:15 PM MST, 15 minutes earlier.

Area forecast discussion, Jul 21, 2:15 PM MST, 15 minutes before

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In the hours before

Special weather statement, Jul 21, 10:19 AM MST, 4 hours 11 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
1019 AM MST Wed Jul 21 2021

AZZ008-037-211745-
Yavapai County Valleys and Basins-Yavapai County  Mountains-
1019 AM MST Wed Jul 21 2021

...SIGNIFICANT WEATHER ADVISORY FOR YAVAPAI COUNTY JUST SOUTH
OF PRESCOTT UNTIL 1045 AM MST...

At 1017 AM MST, Doppler radar was tracking a strong thunderstorm over
Groom Creek Subdivision, or near Prescott Valley. This storm was
nearly stationary.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Prescott, Downtown Prescott, Ponderosa Park, Groom Creek Subdivision,
Indian Hill West Prescott, Oak Knoll Village, Lower Wolf Creek
Campground, Upper Wolf Creek Group Campground and White Spar
Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3454 11240 3445 11238 3442 11253 3455 11254
TIME...MOT...LOC 1717Z 087DEG 1KT 3449 11244

JJ

Special weather statement, Jul 21, 12:03 PM MST, 2 hours 27 minutes before

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Special weather statement, Jul 21, 12:35 PM MST, 1 hour 55 minutes before

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Special weather statement, Jul 21, 12:54 PM MST, 1 hour 36 minutes before

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Special weather statement, Jul 21, 1:57 PM MST, 33 minutes before

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Special weather statement, Jul 21, 2:30 PM MST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 6:16 PM MST	Special Weather Statement	FGZ		29 min
Jul 20, 7:32 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	28 min
Jul 20, 7:55 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	2 hr
Jul 20, 8:33 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	117 min
Jul 21, 12:17 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	118 min
Jul 21, 2:38 AM MST	Flash Flood Watch	FGZ	Apache, Coconino, Gila, Navajo, Yavapai	5 days
Jul 21, 10:19 AM MST	Special Weather Statement	FGZ	Yavapai	26 min
Jul 21, 10:48 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr
Jul 21, 12:03 PM MST	Special Weather Statement	FGZ	Yavapai	42 min
Jul 21, 12:13 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	56 min
Jul 21, 12:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	114 min
Jul 21, 12:35 PM MST	Special Weather Statement	FGZ		40 min
Jul 21, 12:47 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	118 min
Jul 21, 12:54 PM MST	Special Weather Statement	FGZ		36 min
Jul 21, 1:06 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	92 min
Jul 21, 1:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	110 min
Jul 21, 1:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	74 min
Jul 21, 1:57 PM MST	Special Weather Statement	FGZ	Yavapai	48 min
Jul 21, 2:01 PM MST	Areal Flood Advisory	FGZ	Yavapai	119 min
Jul 21, 2:05 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 21, 2:22 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 21, 2:36 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	54 min
Jul 21, 2:53 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	82 min
Jul 21, 2:57 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	60 min
Jul 21, 2:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	60 min
Jul 21, 3:21 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	26 min
Jul 21, 3:34 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	98 min
Jul 21, 3:49 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 21, 4:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	115 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.