Alert archive / Arizona / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 1, NWS Flagstaff, AZ

July 8, 1998Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 8, 1998, 3:15 PM MST for Yavapai County, Arizona. It was in force for 50 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
Jul 8, 1998, 3:15 PM MST (22:15 UTC)
Expired
Jul 8, 1998, 4:05 PM MST
In force
50 min
Issued by
NWS Flagstaff, AZ
Area
Whole counties

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 22:18 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

Phoenix, AZ (KPHX), launched 12:00Z, 10.3 hours before the alert went out and 141 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, Phoenix, AZ at 12:00Z on 1998-07-08Temperature 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 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phoenix, AZ at 12:00Z on 1998-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
1575 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Jul 8, 2:45 PM MST, 30 minutes earlier.

Area forecast discussion, Jul 8, 2:45 PM MST, 30 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
245 PM MST WED JUL 8 1998

SYNOPSIS...MONSOON FLOW AROUND HIGH PRESSURE CENTERED OVER TEXAS WILL
CONTINUE TO PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS ACROSS
NORTHERN ARIZONA FOR THE NEXT SEVERAL DAYS.

DISCUSSION...CIRCLTN SHOWG UP ON SATLT VIS IN WCNTRL NM ENHNCG CNVCTN
NR TH WHT MTNS. ELSEWHERE TSS PULSING UP OVR HYR TRRN W/ CONTD
DVLPMNT ALONG OUTFLOWS INTO THE VLYS. SO PRETTY STD MONSOON DAY. LTL
CHANGE EXPCTD THE NEXT FEW DAYS AS MSTR APPEARS TO BE ENTRNCHD FOR A
WHILE. MDLS DO SHOW TROF DIGGING INTO THE W COAST W/ RDG PUMPG UP OVR
THE CNTRL US. SWLY FLOW MAY BE STRNG ENUF TO ERODE MSTR IN FAR NWRN
AZ...BUT MOST OF OUR CWFA SHOULD STAY E OF THE MONSOON BNDRY.
FLG141 INW-3- ...SIGLER

.FLG...NONE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 4:17 PM MSTSevere Thunderstorm WarningFGZGila48 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1998Every severe thunderstorm warning in 1998

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.