Alert archive / Arizona / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 21, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 31, 2012, 12:38 PM MDT for Navajo County, Arizona. It was in force for 22 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 31, 2012, 12:38 PM MDT (18:38 UTC)
- Expired
- Jul 31, 2012, 1:00 PM MDT
- In force
- 22 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
County Navajo County, AZ
The radar
The Flagstaff radar (KFSX), 62 km from the middle of the area, began a volume at 18:39 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, 6.6 hours before the alert went out and 143 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
- 209 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 818 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
973 WUUS55 KFGZ 311838 SVRFGZ AZC017-311900- /O.NEW.KFGZ.SV.W.0021.120731T1838Z-120731T1900Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1138 AM MST TUE JUL 31 2012 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL NAVAJO COUNTY IN NORTHEAST ARIZONA... * UNTIL NOON MST * AT 1134 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR ARIPINE...OR 17 MILES EAST OF FOREST LAKES...AND MOVING NORTHWEST AT 15 MPH. ANOTHER SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL WAS LOCATED 1 MILE EAST OF HEBER-OVERGAARD...ALSO MOVING NORTHWEST AT 15 MPH. * THE SEVERE THUNDERSTORMS WILL BE NEAR... HEBER-OVERGAARD CURRENTLY RURAL SOUTHWESTERN NAVAJO COUNTY PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. && LAT...LON 3457 11075 3471 11047 3425 11030 3420 11043 TIME...MOT...LOC 1836Z 153DEG 14KT 3443 11053 $$
2 follow-up statements
161 WWUS55 KFGZ 311853 SVSFGZ SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1153 AM MST TUE JUL 31 2012 AZC017-311900- /O.CON.KFGZ.SV.W.0021.000000T0000Z-120731T1900Z/ NAVAJO AZ- 1153 AM MST TUE JUL 31 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON MST FOR SOUTH CENTRAL NAVAJO COUNTY... AT 1148 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 2 MILES NORTHEAST OF HEBER-OVERGAARD...MOVING NORTHWEST AT 15 MPH. LAT...LON 3425 11047 3457 11075 3471 11047 3432 11032 TIME...MOT...LOC 1853Z 148DEG 13KT 3448 11051 $$
999 WWUS55 KFGZ 311900 SVSFGZ SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1200 PM MST TUE JUL 31 2012 AZC017-311909- /O.EXP.KFGZ.SV.W.0021.000000T0000Z-120731T1900Z/ NAVAJO AZ- 1200 PM MST TUE JUL 31 2012 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NAVAJO COUNTY WILL EXPIRE AT NOON MST... HAIL TO THE SIZE OF NICKELS WILL CONTINUE TO BE POSSIBLE EAST AND NORTHEAST OF HEBER-OVERGAARD...ALONG WITH HEAVY RAIN. LAT...LON 3425 11047 3457 11075 3471 11047 3432 11032 TIME...MOT...LOC 1859Z 148DEG 13KT 3450 11052 $$
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 6:51 PM MDT | Severe Thunderstorm Warning | FGZ | Apache | 24 min |
| Jul 30, 6:54 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino, Navajo | 36 min |
| Jul 30, 7:03 PM MDT | Severe Thunderstorm Warning | FGZ | Apache, Navajo | 27 min |
| Jul 30, 7:43 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 32 min |
| Jul 30, 8:01 PM MDT | Areal Flood Advisory | FGZ | Apache | 119 min |
| Jul 31, 1:15 AM MDT | Areal Flood Advisory | FGZ | Apache | 2 hr |
| Jul 31, 11:55 AM MDT | Special Weather Statement | FGZ | 20 min | |
| Jul 31, 12:04 PM MDT | Special Weather Statement | FGZ | 26 min | |
| Jul 31, 1:07 PM MDT | Areal Flood Advisory | FGZ | Navajo | 3 hr |
| Jul 31, 1:22 PM MDT | Severe Thunderstorm Warning | FGZ | Apache | 19 min |
| Jul 31, 1:26 PM MDT | Special Weather Statement | FGZ | 34 min | |
| Jul 31, 1:57 PM MDT | Special Weather Statement | FGZ | Apache | 33 min |
| Jul 31, 2:14 PM MDT | Special Weather Statement | FGZ | 31 min | |
| Jul 31, 2:39 PM MDT | Special Weather Statement | FGZ | 36 min | |
| Jul 31, 3:04 PM MDT | Special Weather Statement | FGZ | Apache | 26 min |
| Jul 31, 3:21 PM MDT | Special Weather Statement | FGZ | 24 min | |
| Jul 31, 4:00 PM MDT | Special Weather Statement | FGZ | 30 min | |
| Jul 31, 4:16 PM MDT | Special Weather Statement | FGZ | 29 min | |
| Jul 31, 4:55 PM MDT | Special Weather Statement | FGZ | 35 min | |
| Jul 31, 5:14 PM MDT | Special Weather Statement | FGZ | 31 min | |
| Jul 31, 5:48 PM MDT | Areal Flood Advisory | FGZ | Coconino, Yavapai | 3 hr |
Nearby
Severe Thunderstorm Warnings in Arizona, 2012Every severe thunderstorm warning in 2012
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.