Alert archive / Texas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 14, NWS Brownsville, TX
NWS Brownsville, TX issued this severe thunderstorm warning at May 20, 2001, 6:37 PM CDT for Jim Hogg County, Zapata County, Texas. It was in force for 53 min. 2 reports came from 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, with what was reported inside it.
The facts
- Issued
- May 20, 2001, 6:37 PM CDT (23:37 UTC)
- Expired
- May 20, 2001, 7:30 PM CDT
- In force
- 53 min
- Issued by
- NWS Brownsville, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Jim Hogg County, TX, Zapata County, TX
The radar
The Corpus Christi radar (KCRP), 160 km from the middle of the area, began a volume at 23:41 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 7:00 PM CDT | Hail 0.75 | Zapata, TX | Dime size hail was reported by the public along Highway 2687. |
| May 20, 7:15 PM CDT | Hail 0.75 | Randado, TX | Dime size hail was reported by a Border Patrol Agent along Highway 16. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 12:00Z, 11.6 hours before the alert went out and 172 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
- 195 J/kg
- Mixed-layer CIN
- -489 J/kg
- Mixed-layer LCL
- 1288 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KBRO 202337 SVRBRO TXC247-505-210030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BROWNSVILLE TX 637 PM CDT SUN MAY 20 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN ZAPATA COUNTY IN DEEP SOUTH TEXAS JIM HOGG COUNTY IN DEEP SOUTH TEXAS * UNTIL 730 PM CDT * AT 631 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 19 MILES EAST OF ZAPATA...MOVING NORTHEAST AT 25 MPH. THIS SEVERE THUNDERSTORM WILL LIKELY PRODUCE HAIL TO THE SIZE OF NICKLE TO QUARTER...AND WINDS IN EXCESS OF 60 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... GUERRA BY 710 PM CDT.7 REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE. LAT...LON 2690 9912 2678 9897 2719 9853 2734 9868 CASTILLO
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 Brownsville, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 4:02 PM CDT, 2 hours 35 minutes earlier.
Area forecast discussion, May 20, 4:02 PM CDT, 2 hours 35 minutes before
DEEP SOUTH TEXAS FORECAST DISCUSSION...CORRECTION FOR SCA WORDING NATIONAL WEATHER SERVICE BROWNSVILLE TX 230 PM CDT SUN MAY 20 2001 WATER VAPOR IMAGERY CLEARLY SHOWS A LARGE UPPER-LOW OVER SOUTHERN SASKATCHEWAN...NOW MOVING SOUTH INTO THE NORTHERN PLAINS. AS THIS NORTHERN STREAM WAVE PHASES WITH A SOUTHERN STREAM WAVE MOVING ACROSS OKLAHOMA AT THIS TIME...A LARGE LONGWAVE TROUGH WILL DEVELOP OVER THE CENTRAL PLAINS...AND ALLOW AN UNSEASONABLY COLD CANADIAN AIRMASS TO MOVE SOUTH AND EAST. A COLD FRONT WILL MOVE RAPIDLY THROUGH THE LOWER VALLEY ON MONDAY EVENING...CLEARING THE RIO GRANDE RIVER SHORTLY AFTER MIDNIGHT. SHOWERS AND THUNDERSTORMS ARE A GOOD POSSIBILITY AREA-WIDE BEGINNING MONDAY EVENING. STRENGTH OF LOW-LEVEL CONVERGENCE ALONG THE COLD FRONT...AND SOMEWHAT FAVORABLE TIMING OF FRONTAL PASSAGE IN THE EARLY EVENING ACROSS THE NORTH WILL ENHANCE THE CHANCES FOR CONVECTION THERE. HOWEVER...WEAK FORECASTED WIND PROFILES...SLIGHTLY CONFLUENT UPPER-FLOW...AND LACK OF UPPER SUPPORT IN THE FORM OF CYCLONIC VORTICITY ADVECTION WILL LIKELY INHIBIT SEVERE THREAT. FOR NOW...WILL INCREASE POPS TO 20 PERCENT ON MONDAY...AND MAINTAIN 40 PERCENT POPS FOR MONDAY NIGHT AND TUESDAY. SEVERE THREAT WILL BE HIGHEST IN NORTHERN COUNTIES OF THE CWA...AND WILL LIKELY COME IN THE FORM OF LARGE HAIL. CURRENT FORECAST NUMBERS FOR TEMPS LOOK GOOD...AND WILL STICK WITH THEM. COLDEST TEMPERATURES ON TUESDAY WILL BE CLOSER TO SURFACE RIDGE AXIS IN THE WEST. UPPER NORTHWEST FLOW WILL PERSIST THROUGH NEXT WEEKEND...AS AN UNSEASONABLY COLD UPPER CYCLONE REMAINS OVER THE EASTERN U.S. A FEW WEAK SHORTWAVE TROUGHS EMBEDDED IN THE UPPER NORTHWEST FLOW WILL BRING CHANCES OF RAIN TO THE AREA FOR FRIDAY AND SATURDAY. SKIES SHOULD BEGIN TO CLEAR ON SUNDAY...AS UPPER RIDGE DEVELOPS OVER THE SOUTHERN PLAINS. MARINE...SOUTHEAST WINDS AT 16 KNOTS AND 4 FOOT SEAS CURRENTLY REPORTED OFFSHORE. SCA MAY BE NEEDED FOR THE BAY AGAIN TOMORROW... AND WILL LIKELY BE NEEDED ACROSS ALL COASTAL WATERS AFTER PASSAGE OF A STRONG COLD FRONT ON MONDAY EVENING. SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ON MONDAY EVENING AND TUESDAY. PRELIMINARY NUMBERS: BRO BB 077/093 070/078 065 00/20/40/40/00 HRL BB 076/095 069/078 064 00/20/40/40/00 MFE BB 076/097 070/076 063 00/20/40/40/00 RGC BB 075/101 068/074 060 00/20/40/40/00 SPI BB 077/085 073/079 067 00/20/40/40/00 SYNOPTIC...DD (65) / AVIATION-MARINE...60 / MESO...SM INTERNET ADDRESS...WWW.SRH.NOAA.GOV/BRO .BRO...SCA TONIGHT FOR GMZ130.
The office that day
Everything else NWS Brownsville, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 5:44 PM CDT | Severe Thunderstorm Warning | BRO | Zapata | 46 min |
Nearby
Severe Thunderstorm Warnings in Texas, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.