Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 94, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 30, 2001, 1:58 PM MDT for Navajo County, Arizona. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 30, 2001, 1:58 PM MDT (19:58 UTC)
- Expired
- Aug 30, 2001, 2:30 PM MDT
- In force
- 32 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Navajo County, AZ
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.0 hours before the alert went out and 163 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1536 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
293 WUUS55 KFGZ 302000 SVRFLG AZC017-302030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1258 PM MST THU AUG 30 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL NAVAJO COUNTY IN ARIZONA THIS INCLUDES THE CITIES OF...ARIPINE...CLAY SPRINGS...PINEDALE * UNTIL 130 PM MST * AT 1258 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER CLAY SPRINGS. THE STORM WAS NEARLY STATIONARY. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO CLAY SPRINGS AND 5 MILES WEST OF PINEDALE AT 130 PM MST. IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN. VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS WASHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE... THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. LAT...LON 3445 11044 3428 11052 3418 11028 3439 11018
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 30, 9:45 AM MDT, 4 hours 13 minutes earlier.
Area forecast discussion, Aug 30, 9:45 AM MDT, 4 hours 13 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 845 AM MST THU AUG 30 2001 .SYNOPSIS...DRIER AND MORE STABLE AIR HAS MOVED INTO THE WESTERN TWO THIRDS OF ARIZONA SINCE YESTERDAY. THE BEST CHANCE FOR SHOWERS AND THUNDERSTORMS TODAY WILL MAINLY BE EAST OF WINSLOW. MOISTURE WILL BE FURTHER LIMITED ON FRIDAY...ANY THUNDERSTORM ACTIVITY WILL BE WIDELY SCATTERED...AND LIKELY CONFINED TO THE HIGHER TERRAIN. AN INCREASE IN MOISTURE IS FORECAST FOR THE LABOR DAY WEEKEND...WITH CHANCES OF SHOWER AND THUNDERSTORM ACTIVITY INCREASING SATURDAY INTO MONDAY ACROSS NORTHERN ARIZONA. .DISCUSSION...SOME DRYING HAS OCCURRED SINCE YESTERDAY...THE MOST SIGNIFICANT DRYING FROM FLAGSTAFF WESTWARD. THE LOWER HALF OF THE MORNING SOUNDINGS HAVE COOLED...THUS STABILIZING THE AIRMASS A BIT MORE THAN WEDNESDAY. DEEPEST MOISTURE LIES ACROSS THE EASTERN QUARTER OF THE STATE...12Z MESO-ETA DEPICTION OF 700 MB THETA-E RIDGE MATCHES THIS WELL. THIS IS MOST LIKELY WHERE THE MAJORITY OF THE STORMS WILL BE TODAY...DOUBT MUCH OF ANYTHING WILL DEVELOP WEST OF WINSLOW. MORE OF THE SAME FRIDAY...WITH A BIT MORE IN THE WAY OF DRYING. WEEKEND AND REST OF EXTENDED STILL A QUESTION MARK...WILL SEE IF THE 12Z AVN IS MAKING ANY CHANGES. CURRENT ZONE PACKAGE IS REPRESENTATIVE OF THIS THINKING...NO UPDATES NEEDED THIS MORNING. PETERSON. .FGZ...NONE.
In the hours before
Special weather statement, Aug 30, 9:50 AM MDT, 4 hours 8 minutes before
AZZ004>018-037>040-301930- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 850 AM MST THU AUG 30 2001 ...SCATTERED THUNDERSTORMS OVER THE NORTHEAST PLATEAUS AND WHITE MOUNTAINS WITH LOCALLY HEAVY RAINFALL POSSIBLE... ...ISOLATED THUNDERSTORMS FROM THE KAIBAB PLATEAU TO THE WESTERN MOGOLLON RIM... SCATTERED THUNDERSTORMS ARE EXPECTED TODAY FROM THE NORTHEAST PLATEAUS SOUTH INTO THE WHITE MOUNTAINS AND THE EASTERN MOGOLLON RIM. THE MOISTURE IS A LITTLE DEEPER OVER EASTERN PARTS OF THE STATE...EXPECT LOCALLY HEAVY RAINFALL OF 1 TO 2 INCHES. A FEW OF THE STORMS MAY PRODUCE STRONG...GUSTY WINDS TO 45 MPH. ONLY ISOLATED THUNDERSTORMS ARE EXPECTED FROM THE KAIBAB PLATEAU TO THE WESTERN MOGOLLON RIM TODAY. MOISTURE AND INSTABILITY IS LIMITED OVER THESE AREAS...EXPECT BRIEF HEAVY RAIN AND SMALL HAIL FROM SOME OF THESE STORMS.
Nearby
Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001
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.