Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 99, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 20, 1997, 2:23 PM MST for Apache County, Arizona. It was in force for 62 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 20, 1997, 2:23 PM MST (21:23 UTC)
- Expired
- Sep 20, 1997, 3:25 PM MST
- In force
- 62 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Apache County, AZ
The radar
The Flagstaff radar (KFSX), 181 km from the middle of the area, began a volume at 21:22 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, 9.4 hours before the alert went out and 210 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
- 41 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1352 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFLG 202124 RRA SVRFLG AZC001-202225- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 223 PM MST SAT SEP 20 1997 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 325 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEASTERN ARIZONA ...SOUTHERN APACHE COUNTY AT 220 PM MST...A SEVERE THUNDERSTORM WAS INDICATED BY FLAGSTAFF DOPPLER RADAR OVER THE COMMUNITY OF MAVERICK OR 21 MILES WEST SOUTHWEST OF ALPINE MOVING NORTHEAST AT 30 MPH. SOME LOCATIONS IN THE WARNING AREA INCLUDE... BIG LAKE AND ALPINE. IF YOU ARE CAUGHT OUTSIDE...TRY TO FIND SHELTER IN A WELL PROTECTED AREA UNTIL THE STORM HAS PASSED. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND FREQUENT LIGHTNING.
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 20, 2:06 PM MST, 17 minutes earlier.
Area forecast discussion, Sep 20, 2:06 PM MST, 17 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 205 PM MST SAT SEP 20 1997 FOCUS OF CONVECTIVE ACTIVITY TODAY IS ALONG THE NORTHERN AND EASTERN BORDERS WITH SOME RATHER STRONG STORMS OVER SOUTHERN PORTIONS OF THE WHITE MOUNTAINS. THE 12Z MODELS ARE PRETTY MUCH IN AGREEMENT THROUGH THE PERIOD. UPPER LOW TO CONTINUE ITS SLOW JOURNEY THROUGH THE GREAT BASIN. THIS SYSTEM IS DOING A DECENT JOB SCOURING OUT MOISTURE AT H5 AND ABOVE IN MAINLY WESTERN AND CENTRAL AREAS OF AZ. HOWEVER...LOW LEVEL RH WONT START TO TAPER OFF IN WESTERN AND CENTRAL AREAS TIL MONDAY. AS A RESULT... FOCUS OF CONVECTIVE ACTIVITY THROUGH THE PERIOD TO BE IN MORE MOIST EASTERN AREAS...WITH A SLIGHT CHANCE OVER THE WESTERN RIM SUNDAY PER THERMODYNAMICS AND ZERO CHANCE MONDAY AS H7 RH 30% OR LESS. DEPRESSINGLY BREEZY TO WINDY AGAIN TODAY...AND EXPECT THE SAME TOMORROW BEFORE GRADIENTS LOOSEN ON TUESDAY. GOT DOWN TO 39F AT THE WX OFFICE LAST NIGHT. EXPECT MORE CHILLY TEMPS TONIGHT...ESPECIALLY WIND SHELTERED AREAS. HELLO FALL. NORA LOOMS IN THE EXTENDED. SEE HURRICANE CENTER PRODUCTS FOR DETAILS. MRF HINTING THAT WEDNESDAY AND THURSDAY MAY BE PRETTY WET IN EASTERN AREAS...THOUGH A LOT OF UNCERTAINTY STILL EXISTS. FLG --00 INW --00 PASSETTI FLG...NONE.
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.