Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 13, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at May 21, 1997, 3:45 PM MDT for Navajo County, Arizona. It was in force for 45 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
- May 21, 1997, 3:45 PM MDT (21:45 UTC)
- Expired
- May 21, 1997, 4:30 PM MDT
- In force
- 45 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 21:45 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, 9.8 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1190 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -48 m²/s²
- 0-3 km storm-relative helicity
- -28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFLG 212148 SVRFLG AZC017-212230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 245 PM MST WED MAY 21 1997 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 330 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTHEASTERN ARIZONA ...SOUTHERN NAVAJO COUNTY AT 245 PM MST...A SEVERE THUNDERSTORM WAS INDICATED BY FLAGSTAFF DOPPLER RADAR 39 MILES SOUTH OF WINSLOW OR 4 MILES WEST NORTHWEST OF HEBER MOVING NORTH NORTHWEST AT 10 MPH. RADAR INDICATES THAT HAIL AROUND ONE INCH IN DIAMETER IS FALLING WITH THIS STORM. PEOPLE NEAR OR IN THE PATH OF THIS SEVERE STORM SHOULD FIND SHELTER UNTIL THE STORM PASSES. PEREZ
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 May 21, 2:57 PM MDT, 48 minutes earlier.
Area forecast discussion, May 21, 2:57 PM MDT, 48 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 200 PM MST WED MAY 21 1997 MORNING AVN MODEL CAPTURED THE CYCLONIC FLOW/WEAK VORT MAX OVER THE NERN PARTS OF AZ AND MOVE IT OUT OF THE STATE DURING THE AFTERNOON. SATELLITE IMAGERY SUPPORTS THIS IDEA. THE AVN...HOWEVER...DIDN'T PICK UP ON THE WEAK CIRCULATION OFF THE WEST COAST OF NRN BAJA. NGM DID...BUT POSITIONED IT TOO FAR EAST AS DID THE ETA MODEL. ATTM... NOT SURE HOW RELEVANT THIS CIRCULATION WILL BE FOR NRN AZ DURING THE NEXT DAY OR TWO. MAYBE TUS WILL HAVE MORE TO DEAL WITH ON THIS MATTER. CUMULUS DEVELOPED AROUND FLG BY 1730Z AND THE FAVORED AREAS FOR AFTN CONVECTION LOOK TO BE THE WRN ZONES AND ALONG MOGOLLON RIM. SFC DEWPOINTS ARE HIGH AND THERE'S PLENTY OF MOISTURE AROUND SO AN ACTIVE AFTERNOON IS IN THE WORKS...BUT NOT TOO CONCERNED ABOUT SVR T-STORMS. AS FOR THE FCST...THERE'S A PRETTY COMPLICATED FLOW GOING ON OVER THE ERN PAC AND RIDGING IS PROGGED THROUGH THE PERIOD WITH MINOR RIPPLES EVIDENT IN THE H5 FLOW. H7 RH HOLDS AT 60% OR GREATER...SO EXPECTING MORE OF THE SAME WEATHER WITH SCATTERED SHOWERS ALONG THE RIM...AND MORE ACTIVE ALONG THE ERN CWA. WITH THE NERN CYCLONIC CIRCULATION MOVING ON...EXPECTING TO RESUME THE DIURNAL CYCLE OF CONVECTION THURSDAY AND FRIDAY. WILL HOLD ON TO SCATTERED DAYTIME POPS CWA-WIDE THROUGH THE PD...WITH HIGHEST POPS AT THE THE WHITE MTNS AND LOW SCATTERED ELSEWHERE...WITH A GENERAL dDECREASE IN ACTIVITY AS THE PERIOD GOES ON. MODEL QPF'S FOLLOW THIS TREND SO IT'S A GO... FLG 3333 INW 3322 PEREZ 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.