Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 49, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 5, 1998, 11:33 AM MST for Coconino County, Arizona. It was in force for 47 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 5, 1998, 11:33 AM MST (18:33 UTC)
- Expired
- Sep 5, 1998, 12:20 PM MST
- In force
- 47 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 18:34 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, 6.6 hours before the alert went out and 68 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
- 71 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 984 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 214 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
226 WUUS1 KFLG 051835 RRA SVRFLG AZC005-051920- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1133 AM MST SAT SEP 5 1998 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN COCONINO COUNTY IN NORTH CENTRAL ARIZONA * UNTIL 1220 PM MST * AT 1130 AM MST... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 13 MILES SOUTH OF METEOR CITY MOVING NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... METEOR CITY AT 1155 AM MST SUNSHINE AT 1155 AM MST TWO GUNS AT NOON MST IF YOU ARE IN THE WARNING AREA... SEEK SAFETY IN AN INTERIOR ROOM AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE... TRY TO FIND SHELTER IN A WELL PROTECTED AREA. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND AND HAIL ALONG WITH 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 5, 10:25 AM MST, 1 hour 8 minutes earlier.
Area forecast discussion, Sep 5, 10:25 AM MST, 1 hour 8 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1025 AM MST SAT SEP 5 1998 SYNOPSIS...ALTHOUGH DEEPER MOISTURE ASSOCIATED WITH THE REMNANTS OF ISIS HAS MOVED NORTH OF THE REGION...WIDESPREAD SHOWERS AND THUNDERSTORMS WILL REMAIN OVER ARIZONA THROUGH THE WEEKEND AS ABUNDANT LOW-LEVEL MOISTURE OVER THE REGION INTERACTS WITH AN UPPER LEVEL WEATHER DISTURBANCE OVER EXTREME WESTERN ARIZONA. THICK CLOUD COVER WILL ALSO GIVE WAY TO MORE BREAKS OF SUN SO EXPECT TEMPERATURES TO BE A LITTLE WARMER TODAY AS WELL. DISCUSSION...SATELLITE SHOWING VIGOROUS UPPER LOW SPINNING OVER SOUTHERN CALIFORNIA...AND DRIFT APPEARS TO BE MAINLY TO THE NORTH THIS MORNING. RUN THROUGH OF THE 12Z MODELS SHOWS ETA MAY BE EJECTING LOW TOO QUICKLY TO THE NE...NGM LOOKS BETTER. TSTORMS ALREADY MOVING THROUGH CENTRAL PORTIONS OF THE CWFA TRUCKING ALONG AT 20 TO 30 MPH. IF MODEL COOLING AT 500MB IS REALIZED...MODIFIED FGZ SOUNDING YIELDS A CAPE VALUE OF 300-500 J/KG...ENOUGH FOR SOME DECENT SIZE HAIL ESPECIALLY IN THE NORTHWEST THIS AFTERNOON. STORMS WILL ALSO DUMP A LOT OF RAIN...BUT QUICK MOVEMENT SHOULD KEEP DOWNPOURS FAIRLY BRIEF. FLG...NONE.
In the hours before
Special weather statement, Sep 5, 9:10 AM MST, 2 hours 23 minutes before
AZZ004>018-051900- AREA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 910 AM MST SAT SEP 5 1998 ...STRONG THUNDERSTORMS PRODUCING HAIL...GUSTY WINDS AND HEAVY RAIN POSSIBLE TODAY... SPOTTER REPORTS OF SIGNIFICANT WEATHER ARE REQUESTED. AN UPPER LEVEL LOW PRESSURE SYSTEM WILL LIFT NORTHEAST OUT OF CALIFORNIA TODAY THROUGH NORTHWESTERN ARIZONA. THIS SYSTEM WILL ACT ON ABUNDANT LOW LEVEL MOISTURE TO PRODUCE STRONG THUNDERSTORMS OVER THE NORTHLAND. THUNDERSTORMS THAT DO FORM WILL MOVE RATHER QUICKLY TO THE NORTH AT 20 TO 30 MPH. THE GREATEST THREAT TODAY WILL BE HAIL...POSSIBLY EXCEEDING AN INCH IN DIAMETER WITH THE STRONGEST THUNDERSTORMS.
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.