Alert archive / Arizona / Special Weather Statements in 2021
Special Weather Statement, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this special weather statement at Aug 15, 2021, 12:37 PM MST. It was in force for 23 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
- Aug 15, 2021, 12:37 PM MST (19:37 UTC)
- Expired
- Aug 15, 2021, 1:00 PM MST
- In force
- 23 min
- Issued by
- NWS Flagstaff, AZ
- Hail
- 0.25 in
- Wind
- 30
The radar
The Flagstaff radar (KFSX), 95 km from the middle of the area, began a volume at 19:40 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, 7.6 hours before the alert went out and 15 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
- 9 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 2026 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>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 Aug 15, 9:55 AM MST, 2 hours 42 minutes earlier.
Area forecast discussion, Aug 15, 9:55 AM MST, 2 hours 42 minutes before
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</html>In the hours before
Special weather statement, Aug 15, 12:37 PM MST, 0 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
1237 PM MST Sun Aug 15 2021
AZZ015-038-152000-
Western Mogollon Rim-Oak Creek and Sycamore Canyons-
1237 PM MST Sun Aug 15 2021
...A strong thunderstorm will impact portions of Coconino County
through 100 PM MST...
At 1235 PM MST, Doppler radar was tracking a strong thunderstorm 8
miles south of Parks, or 19 miles west of Flagstaff, moving southwest
at 20 mph.
HAZARD...Winds in excess of 30 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible. Minor flooding and peasized hail is possible
over portions of Interstate 17 near Williams.
Locations impacted include...
Raymond Boy Scout Camp.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3521 11193 3516 11187 3505 11194 3518 11207
TIME...MOT...LOC 1935Z 048DEG 19KT 3514 11196
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
RRThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 12:52 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 38 min |
| Aug 15, 1:22 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 38 min |
| Aug 15, 1:43 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 36 min |
| Aug 15, 2:17 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 43 min |
| Aug 15, 2:33 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 15, 2:42 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 48 min |
| Aug 15, 3:36 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 39 min |
| Aug 15, 3:49 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Navajo | 26 min |
| Aug 15, 3:52 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 23 min |
| Aug 15, 4:49 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 41 min |
Nearby
Special Weather Statements in Arizona, 2021Every 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.