Alert archive / Arizona / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 9, NWS Tucson, AZ

July 16, 1998Greenlee County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 16, 1998, 2:55 PM MST for Greenlee 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 16, 1998, 2:55 PM MST (21:55 UTC)
Expired: Jul 16, 1998, 3:45 PM MST
In force: 50 min
Issued by: NWS Tucson, AZ
Area: Whole counties

County Greenlee County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 9.9 hours before the alert went out and 194 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3869 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 13 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.

377 
WUUS1 KTUS 162157 RRA
SVRTUS
AZC011-162245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
255 PM MST THU JUL 16 1998

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GREENLEE COUNTY IN SOUTHEASTERN ARIZONA

* UNTIL 345 PM MST

* AT 254 PM MST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 25
  MILES NORTH OF CLIFTON OR 13 MILES SOUTH OF HANNAGAN MEADOW
  MOVING SOUTH AT 10 MPH ALONG HIGHWAY 191.



MEYER

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 Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 16, 2:30 PM MST, 25 minutes earlier.

Area forecast discussion, Jul 16, 2:30 PM MST, 25 minutes before

SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
230 PM MST THU JUL 16 1998

SYNOPSIS...AN EASTERLY AIRFLOW AROUND AN UPPER HIGH CENTERED OVER
SOUTHERN NEVADA AND SOUTHWEST UTAH W

In the hours before

Special weather statement, Jul 16, 1:20 PM MST, 1 hour 35 minutes before

AZZ019-026>030-172300-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1245 PM MST THU JUL 16 1998...THIS PRODUCT IS NOT UPDATED

COUNTY          AREAL    PROBABILITY   RAIN GREATER THAN   STORM
              COVERAGE    OF SEVERE     1.00       2.00    MOTION

COCHISE          10          30          10          5     SW  15
GRAHAM           10          30          10          5     SW  15
GREENLEE         10          30          10         10     SW  15
TUCSON/ERN PIMA  10          25          10          0     SW  15
TOHONO OODHAM    0           0           0          0     SW  15
WESTERN PIMA      0           0           0          0     SW  15
SOUTHEAST PINAL   5          15           5          0     SW  15
SANTA CRUZ       10          30          10          0     SW  15

SYNOPSIS...EASTERLY FLOW HAS BROUGHT AN INCREASE IN MOISTURE TO
SOUTHEAST ARIZONA DURING THE PAST 24 HOURS. STILL RATHER DRY IN THE
LOW-LEVELS HOWEVER AND EXPECT MOST STORMS TO BE CONFINED TO THE
MOUNTAINS. MAIN THREAT FROM STORMS WILL BE STRONG GUSTY WINDS.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
                 THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
                 REACH SEVERE LEVELS (DAMAGING WIND AND/OR
                 LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
                 PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
                 ANY LOCATION
STORM MOTION   - GENERAL DIRECTION TO WHICH THE STORMS WILL
                 LIKELY MOVE AND SPEED IN MPH

NOTE...
VALID TIME IS FROM 12 NOON TO 12 MIDNIGHT OF THE DAY OF ISSUANCE

THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES.

END/CEC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 4:11 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	59 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1998 Every 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.