Alert archive / Arizona / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 99, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 15, 2001, 2:10 PM MST for Yavapai County, Arizona. It was in force for 35 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
- Sep 15, 2001, 2:10 PM MST (21:10 UTC)
- Expired
- Sep 15, 2001, 2:45 PM MST
- In force
- 35 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 129 km from the middle of the area, began a volume at 21:13 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, 9.2 hours before the alert went out and 129 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
- 29 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 1574 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
624 WUUS55 KFGZ 152112 SVRFLG AZC025-152145- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 210 PM MST SAT SEP 15 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL YAVAPAI COUNTY IN ARIZONA THIS INCLUDES THE CITIES OF...WAGONER...PEEPLES VALLEY...WALNUT GROVE * UNTIL 245 PM MST * AT 210 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER WALNUT GROVE...MOVING NORTHWEST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... OVER WALNUT GROVE AT 220 PM MST 8 MILES EAST OF PEEPLES VALLEY AT 245 PM MST VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...MOVE TO A SUBSTANTIAL SHELTER. HEAVY RAINS MAY FLOOD LOW LYING AREAS AND WASHES. 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 3414 11249 3430 11239 3443 11263 3423 11276 MAS
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 15, 9:49 AM MST, 4 hours 21 minutes earlier.
Area forecast discussion, Sep 15, 9:49 AM MST, 4 hours 21 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 949 AM MST SAT SEP 15 2001 .SYNOPSIS...ABUNDANT SUBTROPICAL MOISTURE ACROSS THE REGION WILL BRING ANOTHER ROUND OF THUNDERSTORMS TO THE REGION TODAY. SOME OF THE STORMS WILL PRODUCE HEAVY RAINFALL...ESPECIALLY OVER CENTRAL ARIZONA. A CHANCE OF SHOWERS AND THUNDERSTORMS WILL RETURN SUNDAY AND MONDAY. MUCH DRIER WESTERLY FLOW WILL TAKE HOLD BY TUESDAY... WITH DRY AND WARM CONDITIONS EXPECTED THE REMAINDER OF THE WEEK. .DISCUSSION...GOOD FORECAST FROM THE EARLY MORNING PACKAGE. MAIN HIGHLIGHTS .4 INCH PRECIP WATER ALONG THE UTAH AND ARIZONA BORDER INCREASING TO AROUND AND INCH SOUTHERN YAVAPAI AND NORTHERN GILA COUNTIES. SOUNDING FROM THE MESO ETA SHOWING INVERTED V SOUNDINGS TO THE NORTH...DYNAMIC FORCING (DIVQ AND OMEGA) WEAK SO THUNDERSTORMS ROUGHLY NORTH OF I-40 WILL HAVE THE POTENTIAL OF PRODUCING SOME STRONG GUSTY WIND AND SMALL HAIL. TO THE SOUTH OF INTERSTATE 40 MOISTURE IS DEEPER...MESO ETA SOUNDINGS SUGGEST STEEPER LAPSE RATES...FLOW IS WEAK AS WELL AS THE DYNAMIC FORCING DOWN IN THE NOISE LEVEL...SO THE STORMS ALONG AND SOUTH OF I-40 WILL BE STRONG PULSE AND TERRAIN DRIVEN...WITH THE MAIN THREAT...LOCALIZED HEAVY RAINFALL. CLEMMONS .FGZ...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 4:37 PM MST | Flash Flood Warning | FGZ | Coconino | 113 min |
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; radar from the NEXRAD Level II archive.