Alert archive / Arizona / Special Weather Statements in 2021
Special Weather Statement, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this special weather statement at Aug 1, 2021, 2:55 PM MST. It was in force for 35 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 1, 2021, 2:55 PM MST (21:55 UTC)
- Expired
- Aug 1, 2021, 3:30 PM MST
- In force
- 35 min
- Issued by
- NWS Flagstaff, AZ
The radar
The Cedar City radar (KICX), 210 km from the middle of the area, began a volume at 21:55 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, 9.9 hours before the alert went out and 164 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
- 74 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 1273 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 71 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 1, 2:23 PM MST, 32 minutes earlier.
Area forecast discussion, Aug 1, 2:23 PM MST, 32 minutes before
Area Forecast Discussion National Weather Service Flagstaff AZ 223 PM MST Sun Aug 1 2021 .SYNOPSIS...Scattered thunderstorms will continue through this evening before diminishing overnight. Expect decreasing thunderstorm chances Monday with a drying and warming trend in store Tuesday through Thursday as high pressure strengthens over the area. && .DISCUSSION...Scattered thunderstorms have developed this afternoon. The most pronounced activity has been across eastern Coconino, Navajo and Apache Counties with lesser activity to the west. A few of the stronger storms have been producing heavy rainfall and gusty outflow winds. Locally heavy rain and training storms leading to flash flooding will again be the main concern today. Scattered storms will continue over Navajo and Apache counties this evening before ending overnight. A downturn in thunderstorms is still expected to begin on Monday as strong high pressure over the Rocky Mountains builds westward and over the southwestern states. This will lead to a drier northwest flow over Arizona Monday, causing thunderstorm chances to retreat to the east. We'll still see isolated to scattered activity, but much less than the past several days. Lightning, gusty winds and locally heavy rain will be the main storm threats. Thunderstorm chances will continue the downward trend through the middle of the week with only isolated activity expected Tuesday through Thursday. In addition, the building high pressure and much more daytime sun will allow temperatures to rise above average. The lower elevations of the Grand Canyon will near heat warning criteria of 110F by Wednesday/Thursday. The high pressure ridge axis is forecast to slide east of Arizona on Friday opening the door again to a northward push of monsoon moisture. Operational and ensemble models are in agreement with the return of moisture and thunderstorm chances Friday through next weekend. && .AVIATION...For the 00Z package...Mainly VFR conditions will prevail. Scattered storms will continue through this evening, mainly along and north of a KFLG-KSOW line. Periods of MVFR/IFR conditions and gusty, erratic winds will occur in and around thunderstorms. Storm activity will gradually diminish after 03Z. Another round of isolated to scattered storms will develop after 18Z Mon. Aviation discussion not updated for TAF amendments. && .FIRE WEATHER...Scattered thunderstorms with locally heavy rain will continue this evening. Look for decreasing thunderstorm chances Monday and Tuesday with a drying and warming trend. Wednesday through Friday...Warm and mainly dry conditions continue through midweek with light winds. Moisture and storm chances return Friday. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...MCT AVIATION...MCT FIRE WEATHER...MCT For Northern Arizona weather information visit weather.gov/flagstaff
In the hours before
Special weather statement, Aug 1, 1:30 PM MST, 1 hour 25 minutes before
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</html>Special weather statement, Aug 1, 1:38 PM MST, 1 hour 17 minutes before
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</html>Special weather statement, Aug 1, 1:53 PM MST, 1 hour 2 minutes before
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</html>Special weather statement, Aug 1, 2:03 PM MST, 52 minutes before
Special Weather Statement National Weather Service Flagstaff AZ 303 PM MDT Sun Aug 1 2021 AZZ012-013-012130- Little Colorado River Valley in Coconino County-Little Colorado River Valley in Navajo County- 303 PM MDT Sun Aug 1 2021 ...A STRONG THUNDERSTORM WILL CONTINUE TO AFFECT THE WINSLOW AREA UNTIL 230 PM ARIZONA TIME... At 202 PM Arizona time, Doppler radar was tracking a strong thunderstorm near Winslow, moving north at 15 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Winslow. I-40 near Winslow. 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 3492 11074 3498 11091 3522 11087 3519 11061 TIME...MOT...LOC 2102Z 197DEG 11KT 3504 11079 TM
Special weather statement, Aug 1, 2:26 PM MST, 29 minutes before
Special Weather Statement National Weather Service Flagstaff AZ 326 PM MDT Sun Aug 1 2021 AZZ012-013-012200- Little Colorado River Valley in Coconino County-Little Colorado River Valley in Navajo County- 326 PM MDT Sun Aug 1 2021 ...A STRONG THUNDERSTORM WILL CONTINUE TO MOVE NORTH OF WINSLOW THROUGH 300 PM ARIZONA TIME... At 224 PM Arizona time, Doppler radar was tracking a strong thunderstorm near Winslow, moving north at 10 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. This storm will remain over mainly rural areas north of Winslow and I-40. 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 3504 11071 3506 11088 3527 11088 3524 11059 TIME...MOT...LOC 2124Z 190DEG 10KT 3509 11078 TM
Special weather statement, Aug 1, 2:55 PM MST, 0 minutes before
Special Weather Statement National Weather Service Flagstaff AZ 355 PM MDT Sun Aug 1 2021 AZZ009-039-012230- Black Mesa Area-Northeast Plateaus and Mesas Hwy 264 Northward- 355 PM MDT Sun Aug 1 2021 ...A STRONG THUNDERSTORM WILL CONTINUE TO DEVELOP NEAR KAIBITO THROUGH 430 PM NAVAJO NATION TIME... At 353 PM MDT, Doppler radar was tracking a strong thunderstorm east of Kaibito, or 36 miles northeast of Tuba City, moving northeast at 10 mph. Half inch hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Inscription House Landing Strip, Shonto, and Kaibito. 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 3637 11092 3641 11111 3680 11114 3665 11049 TIME...MOT...LOC 2153Z 211DEG 8KT 3657 11090 TM
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:22 PM MST | Areal Flood Advisory | FGZ | Yavapai | 113 min |
| Jul 31, 6:08 PM MST | Areal Flood Advisory | FGZ | Apache, Navajo | 3 hr |
| Aug 1, 12:03 PM MST | Special Weather Statement | FGZ | 27 min | |
| Aug 1, 12:15 PM MST | Special Weather Statement | FGZ | 30 min | |
| Aug 1, 12:53 PM MST | Special Weather Statement | FGZ | Coconino | 22 min |
| Aug 1, 1:08 PM MST | Special Weather Statement | FGZ | 22 min | |
| Aug 1, 1:14 PM MST | Special Weather Statement | FGZ | 31 min | |
| Aug 1, 1:30 PM MST | Special Weather Statement | FGZ | Navajo | 30 min |
| Aug 1, 1:38 PM MST | Special Weather Statement | FGZ | Coconino | 22 min |
| Aug 1, 1:53 PM MST | Special Weather Statement | FGZ | 37 min | |
| Aug 1, 2:03 PM MST | Special Weather Statement | FGZ | Navajo | 27 min |
| Aug 1, 2:26 PM MST | Special Weather Statement | FGZ | Navajo | 34 min |
| Aug 1, 3:12 PM MST | Special Weather Statement | FGZ | 33 min | |
| Aug 1, 3:15 PM MST | Special Weather Statement | FGZ | 30 min | |
| Aug 1, 3:21 PM MST | Special Weather Statement | FGZ | 24 min | |
| Aug 1, 3:58 PM MST | Flash Flood Warning | FGZ | Gila, Navajo | 3 hr |
| Aug 1, 4:18 PM MST | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Aug 1, 4:24 PM MST | Special Weather Statement | FGZ | 51 min | |
| Aug 1, 4:38 PM MST | Severe Thunderstorm Warning | FGZ | Apache, Navajo | 37 min |
| Aug 1, 4:51 PM MST | Flash Flood Warning | FGZ | Gila, Navajo | 3 hr |
| Aug 1, 4:52 PM MST | Flash Flood Warning | FGZ | Apache, Coconino, Navajo | 3 hr |
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.