Alert archive / Arizona / Tornado Warnings in 2011
Tornado Warning 9, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this tornado warning at Sep 15, 2011, 12:43 PM MDT for Navajo County, Arizona. It was in force for 32 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 15, 2011, 12:43 PM MDT (18:43 UTC)
- Expired
- Sep 15, 2011, 1:15 PM MDT
- In force
- 32 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
County Navajo County, AZ
The radar
The Flagstaff radar (KFSX), 120 km from the middle of the area, began a volume at 18:45 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 15, 12:45 PM MDT | FUNNEL CLOUD | 4 Wsw Dilkon, AZ | BRIEF FUNNEL CLOUD...POSSIBLE TORNADO |
| Sep 15, 1:00 PM MDT | HAIL 2 | 3 Wsw Dilkon, AZ |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 6.7 hours before the alert went out and 132 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
- 154 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 763 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
776 WFUS55 KFGZ 151843 TORFGZ AZC017-151915- /O.NEW.KFGZ.TO.W.0009.110915T1843Z-110915T1915Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1143 AM MST THU SEP 15 2011 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * TORNADO WARNING FOR... CENTRAL NAVAJO COUNTY IN NORTHEAST ARIZONA... * UNTIL 1215 PM MST * AT 1140 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 9 MILES WEST OF CASTLE BUTTE...OR 24 MILES NORTHEAST OF WINSLOW...MOVING EAST AT 15 MPH. THIS STORM MAY ALSO PRODUCE QUARTER SIZE HAIL. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO CEDAR SPRINGS AND DILKON PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS. WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. && LAT...LON 3551 11024 3531 11023 3529 11053 3542 11056 TIME...MOT...LOC 1843Z 257DEG 15KT 3534 11049 $$ OUTLER
3 follow-up statements
918 WWUS55 KFGZ 151857 SVSFGZ SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1157 AM MST THU SEP 15 2011 AZC017-151915- /O.CON.KFGZ.TO.W.0009.000000T0000Z-110915T1915Z/ NAVAJO AZ- 1157 AM MST THU SEP 15 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 PM MST FOR CENTRAL NAVAJO COUNTY... AT 1154 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A POSSIBLE TORNADO. THIS TORNADO WAS LOCATED NEAR MILEPOST 375 ON SR 87...OR 27 MILES NORTHEAST OF WINSLOW...MOVING EAST AT 15 MPH. THIS STORM IS ALSO CAPABLE OF PRODUCING QUARTER SIZED HAIL AND DAMAGING WINDS IN EXCESS OF 60 MILES PER HOUR. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MILEPOST 380 ON SR 87...CEDAR SPRINGS AND DILKON PRECAUTIONARY/PREPAREDNESS ACTIONS... WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. && LAT...LON 3551 11024 3531 11023 3531 11048 3544 11048 TIME...MOT...LOC 1857Z 257DEG 15KT 3535 11042 $$ OUTLER
072 WWUS55 KFGZ 151905 SVSFGZ SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1205 PM MST THU SEP 15 2011 AZC017-151915- /O.CON.KFGZ.TO.W.0009.000000T0000Z-110915T1915Z/ NAVAJO AZ- 1205 PM MST THU SEP 15 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1215 PM MST FOR CENTRAL NAVAJO COUNTY... AT 1159 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED NEAR MILEPOST 375 ON SR 87...OR 28 MILES NORTHEAST OF WINSLOW...MOVING EAST AT 15 MPH. AT 12 PM...LAW ENFORCEMENT REPORTED TWO INCH DIAMETER HAIL IN THE CITY OF DILKON. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO DILKON PRECAUTIONARY/PREPAREDNESS ACTIONS... WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. && LAT...LON 3532 11043 3544 11044 3547 11024 3531 11023 TIME...MOT...LOC 1904Z 257DEG 15KT 3536 11038 $$ OUTLER
610 WWUS55 KFGZ 151913 SVSFGZ SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1213 PM MST THU SEP 15 2011 AZC017-151923- /O.EXP.KFGZ.TO.W.0009.000000T0000Z-110915T1915Z/ NAVAJO AZ- 1213 PM MST THU SEP 15 2011 ...THE TORNADO WARNING FOR CENTRAL NAVAJO COUNTY WILL EXPIRE AT 1215 PM MST... THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED. HOWEVER THE STORM IS STILL PRODUCING SMALL HAIL AND HEAVY RAIN. REPORT OBSERVED SEVERE WEATHER TO US AT 1-888-745-1637. LAT...LON 3532 11043 3544 11044 3547 11024 3531 11023 TIME...MOT...LOC 1913Z 257DEG 15KT 3537 11033 $$ OUTLER
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 6:45 PM MDT | Severe Thunderstorm Warning | FGZ | Apache, Gila, Navajo | 30 min |
| Sep 14, 7:23 PM MDT | Areal Flood Advisory | FGZ | Coconino, Yavapai | 3 hr |
| Sep 14, 10:45 PM MDT | Areal Flood Advisory | FGZ | Coconino, Yavapai | 105 min |
| Sep 15, 9:59 AM MDT | Areal Flood Advisory | FGZ | Coconino | 3 hr |
| Sep 15, 12:18 PM MDT | Flash Flood Warning | FGZ | Apache | 57 min |
| Sep 15, 1:41 PM MDT | Special Weather Statement | FGZ | Navajo | 19 min |
| Sep 15, 4:05 PM MDT | Special Weather Statement | FGZ | Coconino | 10 min |
| Sep 15, 4:22 PM MDT | Special Weather Statement | FGZ | Coconino | 8 min |
Nearby
Tornado Warnings in Arizona, 2011Every tornado warning in 2011Tornadoes in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.