Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 44, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 11, 1997, 1:35 PM MDT for Navajo County, Arizona. It was in force for 55 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
- Aug 11, 1997, 1:35 PM MDT (19:35 UTC)
- Expired
- Aug 11, 1997, 2:30 PM MDT
- In force
- 55 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Navajo County, AZ
The radar
The Flagstaff radar (KFSX), 122 km from the middle of the area, began a volume at 19:38 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, 7.6 hours before the alert went out and 136 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
- 298 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 676 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 221 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
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 Aug 11, 10:00 AM MDT, 3 hours 35 minutes earlier.
Area forecast discussion, Aug 11, 10:00 AM MDT, 3 hours 35 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 AM MST MON AUG 11 1997 SAT IR IMAGERY INDICATING JET STREAK CURRENT WORKING ACROSS CENTRAL AZ...PLACING NW IN FAVORABLE LEFT FRONT QUAD. THIS HELPING TO KICK OFF ISOLATED THUNDERSTORMS IN THE NW DESPITE MID LEVEL DRYING. FORTUNATELY STORM MOTION IS AWAY FROM THE SUPAI AREA. SFC DEWPOINTS AND MORNING SOUNDINGS FROM AROUND THE AREA STILL SHOWING CONSIDERABLE LOW LEVEL MOISTURE. 12Z RUC BRINGING IN WEAK RIPPLE INTO WESTERN AZ THIS AFTERNOON...THIS NOTED ON MORNING WATER VAPOR IMAGERY OVER SOUTHERN CA IN ASSOCIATION WITH JET STREAK CURRENTLY WORKING ACROSS. THIS MAY POSE A THREAT FOR THUNDERSTORM DEVELOPMENT OVER YAVAPAI COUNTY WHERE SFC DEWPOINTS REMAIN IN THE MID 50S TO LOW 60S. 12Z ETA...ALONG WITH 03Z MSO INDICATING SOME UPPER LEVEL DIVERGENCE WORKING ACROSS THE NW...AND MODELS MAY BE A BIT TOO QUICK TO BRUSH IT ACROSS. FOR NOW BROAD-BRUSHING FORECASTS APPEAR TO BE ON TRACK. PLANNING NO UPDATES AT THIS TIME. FLG 422 INW 422 FLG...NONE
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 11:27 PM MDT | Flash Flood Warning | FGZ | Coconino | 2 hr |
| Aug 11, 1:22 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 63 min |
| Aug 11, 1:33 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 52 min |
| Aug 11, 2:28 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 47 min |
| Aug 11, 2:43 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 62 min |
| Aug 11, 3:47 PM MDT | Severe Thunderstorm Warning | FGZ | Apache | 43 min |
| Aug 11, 4:13 PM MDT | Severe Thunderstorm Warning | FGZ | Apache | 32 min |
| Aug 11, 4:46 PM MDT | Severe Thunderstorm Warning | FGZ | Apache | 64 min |
| Aug 11, 4:56 PM MDT | Flash Flood Warning | FGZ | Apache | 2 hr |
| Aug 11, 5:38 PM MDT | Severe Thunderstorm Warning | FGZ | Coconino | 37 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.