Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 73, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 2, 1997, 2:33 PM MST for Coconino County, Arizona. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 2, 1997, 2:33 PM MST (21:33 UTC)
- Expired
- Sep 2, 1997, 3:30 PM MST
- In force
- 57 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 68 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
- 83 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 1271 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 2, 2:10 PM MST, 23 minutes earlier.
Area forecast discussion, Sep 2, 2:10 PM MST, 23 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 200 PM MST TUE SEP 2 1997 ETA SHOWS SOME H3 DVRG AND UVV OVR SOUTHEAST PART OF CWA AT MIDDAY THEN SHIFTS IT ALL TO THE WESTERN SECTIONS AT 00Z. THIS SCENARIO STARTING TO TAKE SHAPE WITH NEWEST CONVECTION POPPING UP OVR EASTERN GILA AND SOUTHERN NAVAJO. WILL TREND FIRST PERIOD THIS WAY WITH CONVECTION DYING IN EAST BY MIDNIGHT...PERHAPS LINGERING IN WEST AND CENTRAL WHERE WEAK LIFT REMAINS INTO WEE HOURS OF MORNING. WITH NO SIGNIF TRIGGER SEEN ON MODELS OR SAT IMAGES IN WEST...WILL NOT ISSUE ANY FF WATCH TODAY. FOR WED AND THU...MOISTURE ADVECTING IN FROM EAST INTO OUR EASTERN SECTIONS SHOULD HAVE POPS BACK TO MODERATE GRADE MONSOON. OTHERWISE SCT ACTIVITY EXPECTED AS SE FLOW KEEPS NORTHERN AZ UNDER PLENTIFUL MOISTURE. NEED TO MONITOR FOR SIGNIF TRIGGERS EACH DAY FOR POTENTIAL FF PROBLEMS. FLG 353 INW 232 BET FLG...NONE
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 11:34 PM MST | Flash Flood Warning | FGZ | Navajo | 61 min |
| Sep 1, 11:34 PM MST | Flash Flood Warning | FGZ | Apache | 61 min |
| Sep 1, 11:34 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 61 min |
| Sep 1, 11:34 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 61 min |
| Sep 2, 2:33 PM MST | Flash Flood Warning | FGZ | Coconino | 57 min |
| Sep 2, 2:56 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 89 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997
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.