Alert archive / Arizona / Severe Thunderstorm Warnings in 2016
Severe Thunderstorm Warning 74, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 27, 2016, 5:26 PM MDT for Navajo County, Arizona. It was in force for 49 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
- Sep 27, 2016, 5:26 PM MDT (23:26 UTC)
- Expired
- Sep 27, 2016, 6:15 PM MDT
- In force
- 49 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
County Navajo County, AZ
The radar
The Flagstaff radar (KFSX), 78 km from the middle of the area, began a volume at 23:27 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.4 hours before the alert went out and 153 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1744 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
703 WUUS55 KFGZ 272326 SVRFGZ AZC017-280015- /O.NEW.KFGZ.SV.W.0074.160927T2326Z-160928T0015Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 426 PM MST TUE SEP 27 2016 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NAVAJO COUNTY IN NORTH CENTRAL ARIZONA... * UNTIL 515 PM MST * AT 425 PM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 9 MILES NORTH OF ARIPINE... OR 27 MILES NORTHEAST OF FOREST LAKES...AND MOVING NORTHWEST AT 30 MPH. * THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF NAVAJO COUNTY...INCLUDING THE FOLLOWING LOCATIONS: DRY LAKE. THIS INCLUDES THE FOLLOWING HIGHWAYS... STATE ROUTE 277 BETWEEN MILE MARKERS 317 AND 330. STATE ROUTE 377 BETWEEN MILE MARKERS 2 AND 17. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 3449 11017 3438 11026 3460 11069 3480 11043 TIME...MOT...LOC 2325Z 121DEG 26KT 3455 11040 $$ RB
1 follow-up statement
779 WWUS55 KFGZ 272345 SVSFGZ SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 445 PM MST TUE SEP 27 2016 AZC017-280015- /O.CON.KFGZ.SV.W.0074.000000T0000Z-160928T0015Z/ NAVAJO AZ- 445 PM MST TUE SEP 27 2016 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MST FOR NAVAJO COUNTY... AT 444 PM MST...DOPPLER RADAR CONTINUED TO SHOW A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 15 MILES NORTHWEST OF ARIPINE...OR 24 MILES NORTHEAST OF FOREST LAKES...MOVING NORTHWEST AT 30 MPH. THIS SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF NAVAJO COUNTY...INCLUDING THE FOLLOWING LOCATIONS: DRY LAKE. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 3449 11017 3438 11026 3460 11069 3480 11043 TIME...MOT...LOC 2344Z 121DEG 26KT 3462 11054 $$ RB
What forecasters said that day
The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Sep 27, 3:43 PM MDT, 1 hour 43 minutes earlier.
Area forecast discussion, Sep 27, 3:43 PM MDT, 1 hour 43 minutes before
Area Forecast Discussion National Weather Service Flagstaff AZ 243 PM MST TUE SEP 27 2016 .SYNOPSIS...A low pressure system currently over southwestern Arizona will gradually move northward through Thursday. Expect increasing chances of showers and thunderstorms across northern Arizona through Thursday then decreasing on Friday. Dry air is forecast to move in over the weekend. Near normal temperatures will continue. && .DISCUSSION... Water vapor loop shows the weak upper low centered over southwestern AZ this afternoon and we are finally seeing some widely scattered and light convection developing in Apache county this afternoon. The upper low to gradually move northward across Arizona through Thursday. For tonight we have scaled back precip chances as most recent models show southeast flow to persist in a rather stable airmass. Wednesday through Thursday night...Winds aloft to become southerly on Wednesday with a decent moisture plume moving northward into AZ. We are expecting greater precip coverage Wednesday and Thursday due to the moisture increase. The best chance for thunderstorms should be from the afternoon into the early evening hours in response to peak daytime heating and instability. Friday through Tuesday. Progs in good agreement showing dry air moving in from the west on Friday. Kept the slight chance of showers in for this transition period. From Friday night onward dry weather is expected with occasional high clouds streaming across the northland. && .AVIATION...For the 00Z package...look for Widely scattered -SHRA and isolated -tsra through 12Z weds...then scattered -SHRA/-TSRA spreading northward through the day. MVFR conditions possible in heavier storms. Aviation discussion not updated for TAF amendments. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC...DL AVIATION...DL For Northern Arizona weather information visit weather.gov/flagstaff
In the hours before
Local storm report, Sep 27, 3:32 PM MDT, 1 hour 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
232 PM MST TUE SEP 27 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0232 PM HAIL 3 N SHOW LOW 34.28N 110.04W
09/27/2016 E0.50 INCH NAVAJO AZ TRAINED SPOTTER
&&
EVENT NUMBER FGZ1600245
041Local storm report, Sep 27, 4:46 PM MDT, 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
346 PM MST TUE SEP 27 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0343 PM HAIL 3 N SHOW LOW 34.28N 110.04W
09/27/2016 M1.00 INCH NAVAJO AZ TRAINED SPOTTER
&&
EVENT NUMBER FGZ1600246
BAKLocal storm report, Sep 27, 4:56 PM MDT, 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
356 PM MST TUE SEP 27 2016
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0353 PM HAIL 7 N SHOW LOW 34.34N 110.04W
09/27/2016 M0.75 INCH NAVAJO AZ TRAINED SPOTTER
HAIL COVERING THE GROUND. 0.5 TO 0.75 INCHES IN
DIAMETER.
&&
EVENT NUMBER FGZ1600247
BAKSpecial weather statement, Sep 27, 5:21 PM MDT, 5 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 421 PM MST TUE SEP 27 2016 AZZ013-016-272345- EASTERN MOGOLLON RIM AZ- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY AZ- 421 PM MST TUE SEP 27 2016 ...SIGNIFICANT WEATHER ADVISORY FOR NAVAJO COUNTY UNTIL 445 PM MST... AT 420 PM MST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 10 MILES NORTHEAST OF ARIPINE...OR 26 MILES NORTHWEST OF SHOW LOW... MOVING NORTHWEST AT 45 MPH. NICKEL SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... DRY LAKE. PRECAUTIONARY/PREPAREDNESS ACTIONS... VERY HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. && LAT...LON 3447 11016 3438 11024 3453 11055 3472 11034 TIME...MOT...LOC 2320Z 130DEG 41KT 3454 11034 MAS
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 27, 4:24 PM MDT | Severe Thunderstorm Warning | FGZ | Apache, Navajo | 36 min |
| Sep 27, 5:21 PM MDT | Special Weather Statement | FGZ | 24 min | |
| Sep 27, 5:49 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino, Navajo | 26 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2016Every severe thunderstorm warning in 2016
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.