Alert archive / Arizona / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 53, NWS Flagstaff, AZ

August 13, 1997Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 13, 1997, 1:41 PM MDT for Navajo County, Arizona. It was in force for 79 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 13, 1997, 1:41 PM MDT (19:41 UTC)
Expired
Aug 13, 1997, 3:00 PM MDT
In force
79 min
Issued by
NWS Flagstaff, AZ
Area
Whole counties

County Navajo County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 7.7 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.

Skew-T log-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 1997-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 1997-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1285 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFLG 131943 RRA
SVRFLG
AZC017-132100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1241 PM MST WED AUG 13 1997

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 200 PM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHEASTERN ARIZONA

   ...SOUTH CENTRAL AND SOUTHERN NAVAJO COUNTY
 
AT 1238 PM MST...A SEVERE THUNDERSTORM WAS INDICATED BY FLAGSTAFF
DOPPLER RADAR 11 MILES NORTHWEST OF SHOW LOW OR 11 MILES SOUTHWEST
OF SNOWFLAKE MOVING EAST AT 10 MPH. THIS STORM WILL PASS OVER
SHUMWAY BY 1 PM MST.

SOME LOCATIONS IN THE WARNING AREA INCLUDE...  SHUMWAY AND TAYLOR
 
IF YOU ARE CAUGHT OUTSIDE...FIND SHELTER IN A STRONG BUILDING AND
STAY AWAY FROM WINDOWS 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 Aug 13, 9:45 AM MDT, 3 hours 56 minutes earlier.

Area forecast discussion, Aug 13, 9:45 AM MDT, 3 hours 56 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
845 AM MST TUE AUG 12 1997

LOW LEVELS CONTINUING TO DRY OUT...AS 5H RIDGE FLATTENS AND UPPER
LEVEL FLOW BECOMES MORE WESTERLY.  SAT IMAGERY INDICATING THAT MOST
OF THE CWA UNDER CLEAR SKIES...WITH SOME CLOUDS NOTED ON THE KAIBAB
PLATEAU. 12Z SOUNDINGS INDICATING SOME INSTABILITY STILL PRESENT AND
SHOULD SEE SOME DIURNAL DEVELOPMENT THIS AFTERNOON...AND THIS SHOULD
OCCUR AT THE HIGHER TERRAIN. GULF SURGE FOR THE MOST PART HAS BEEN
SHUT OFF. DEWPOINT VALUES STILL REMAINING IN THE AROUND 50 ACROSS
MOST OF THE CWA...BUT MORNING SOUNDING INDICATING THAT MOISTURE LAYER
IS A BIT MORE SHALLOW THAN PREVIOUS DAYS. EXPECTING SOME AREAS TO
BECOME MIXED OUT LATER THIS MORNING INTO THIS AFTERNOON. FOR
TEMPS...EXPECT FURTHER WARMING AS A BIT MORE DAYTIME HEATING
AVAILABLE. CURRENT ZONES HAVE THIS COVERED...PLANNING NO UPDATES.
FLG 1-00 INW 0000
FLG...NONE

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 13, 3:40 PM MDTSevere Thunderstorm WarningFGZApache45 min
Aug 13, 5:42 PM MDTSevere Thunderstorm WarningFGZNavajo48 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.