Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 4, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Apr 11, 1997, 12:19 PM MST for Coconino County, Arizona. It was in force for 31 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
- Apr 11, 1997, 12:19 PM MST (19:19 UTC)
- Expired
- Apr 11, 1997, 12:50 PM MST
- In force
- 31 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 19:21 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, 7.3 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1584 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 11, 8:25 AM MST, 3 hours 54 minutes earlier.
Area forecast discussion, Apr 11, 8:25 AM MST, 3 hours 54 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 825 AM MST FRI APR 11 1997 ENHANCED CLOUDINESS ON RAMSDIS 4KM IR IMAGERY OVER THE WHITE MOUNTAINS/FAR EASTERN LITTLE COLORADO RIVER VALLEY AT THIS TIME. REPORTS FROM THE AREA INDICATE POCKETS OF HEAVY SNOW WITH ACCUMULATIONS ON ROADS ABOVE 7500 FEET. SNOWING DOWN AT ST. JOHNS AS WELL. THIS AREA LINES UP WELL WITH 12Z RUC AND ETA QPFS. EXPECT THIS DISTURBANCE TO MOVE OUT BY LATE MORNING AND HAVE UPDATED FOR THIS ALREADY. 12Z FGZ SOUNDING INDICATING AN INITIAL LI OF ZERO. 88D AND OBS INDICATING ISOLATED SHOWERS OR VIRGA ABOUT THE REGION. NEXT VORT MAX NEAR LAS PROGGED TO SWEEP THROUGH TODAY. ETA LI FIELDS FOR 00Z SAT LINES UP WELL WITH 94O GRAPHIC FROM SPC. MOISTURE LOOKS LIMITED...BUT WITH DYNAMICS ASSOCIATED WITH VORT...SHOULD BE ENOUGH FOR ISOLATED SHOWERS. MAYBE A BIT MORE COVERAGE NEEDED THAN CURRENTLY ADVERTISED AND WILL EXAMINE THIS MORE WHEN REST OF 12Z DATA COMES IN. FLG 100 INW 000 PASSETTI FLG...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 12:19 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 31 min |
| Apr 11, 12:29 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 21 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.