Alert archive / Texas / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 62, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 27, 2015, 3:21 AM CDT for 8 counties in Texas. It was in force for 24 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
- Apr 27, 2015, 3:21 AM CDT (08:21 UTC)
- Expired
- Apr 27, 2015, 3:45 AM CDT
- In force
- 24 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Austin County, TX, Brazos County, TX, Burleson County, TX, Colorado County, TX, Grimes County, TX, Madison County, TX, Waller County, TX, Washington County, TX
The radar
The Ft Hood radar (KGRK), 118 km from the middle of the area, began a volume at 08:25 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 27, 1:27 AM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 8.4 hours before the alert went out and 294 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
- 2092 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 828 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -41 m²/s²
- 0-3 km storm-relative helicity
- -27 m²/s²
- Significant tornado parameter
- -0.2
- Supercell composite
- -1.3
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 Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 26, 11:48 PM CDT, 3 hours 33 minutes earlier.
Area forecast discussion, Apr 26, 11:48 PM CDT, 3 hours 33 minutes before
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</html>Hazardous weather outlook, Apr 26, 3:46 PM CDT, 11 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 346 PM CDT SUN APR 26 2015 TXZ163-164-176>179-195>200-210>214-226-227-235>238-272100- AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND- GALVESTON-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-MADISON-MATAGORDA- MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-WALLER-WASHINGTON- WHARTON- 346 PM CDT SUN APR 26 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TONIGHT AREAS OF LIGHT FOG MAY BE POSSIBLE ACROSS THE COASTAL AREAS TONIGHT WITH VISIBILITIES OF 2 TO 5 MILES. AN UPPER LEVEL DISTURBANCE WILL APPROACH FROM THE WEST AFTER MIDNIGHT. THIS FEATURE WILL GENERATE SHOWERS AND THUNDERSTORMS OVER THE WESTERN PORTIONS OF SOUTHEAST TEXAS GENERALLY ALONG AND WEST OF AN EDNA TO HUNTSVILLE LINE. A FEW OF THE STORMS COULD BECOME STRONG TO SEVERE WITH LARGE HAIL AND DAMAGING WINDS. HEAVY RAIN WILL BE POSSIBLE THERE AS WELL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ON MONDAY A POTENT STORM SYSTEM WILL MOVE THROUGH THE AREA BRINGING A WIDESPREAD THREAT OF VERY HEAVY RAINFALL AND SEVERE WEATHER. THE POTENTIAL EXISTS FOR LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES. MOISTURE LEVELS ARE ALSO VERY HIGH SO FLOODING ISSUES FROM LOCALLY HEAVY RAIN WILL ALSO BE A POSSIBILITY. A LARGE SWATH OF 1 TO 2 INCHES OF RAIN IS EXPECTED TO DEVELOP AND SPREAD WEST TO EAST OF ACROSS THE AREA WITH SOME POTENTIAL FOR ISOLATED AMOUNTS IN EXCESS OF 5 INCHES. A COLD FRONT WILL CROSS SOUTHEAST TEXAS LATE MONDAY NIGHT. THE FRONT WILL USHER IN MUCH COOLER TEMPERATURES. WINDS WILL BECOME STRONG BEHIND THE FRONT AND A WIND ADVISORY MAY BE REQUIRED ALONG THE COAST EARLY TUESDAY. .SPOTTER INFORMATION STATEMENT... EMERGENCY MANAGERS AND STORM SPOTTERS SHOULD PREPARE FOR POSSIBLE ACTIVATION LATE TONIGHT AND AGAIN ON MONDAY. GMZ330-335-350-355-370-375-272100- GALVESTON BAY-MATAGORDA BAY- WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM- WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM- WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM- WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM- 346 PM CDT SUN APR 26 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A VIGOROUS UPPER LEVEL STORM SYSTEM WILL BRING SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS TO THE REGION ON MONDAY. A FEW OF THE STORMS WILL PRODUCE STRONG GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
In the hours before
Special weather statement, Apr 27, 2:42 AM CDT, 39 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
242 AM CDT MON APR 27 2015
TXZ176-195>198-210>212-226-270900-
MADISON TX-GRIMES TX-AUSTIN TX-BURLESON TX-WALLER TX-COLORADO TX-
WASHINGTON TX-WHARTON TX-BRAZOS TX-
242 AM CDT MON APR 27 2015
...SIGNIFICANT WEATHER ADVISORY FOR COLORADO...NORTH CENTRAL
WHARTON...BURLESON...WASHINGTON...AUSTIN...WESTERN MADISON...
BRAZOS...WESTERN WALLER AND WESTERN GRIMES COUNTIES UNTIL 400 AM
CDT...
AT 241 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS EXTENDING FROM NEAR ROCKDALE TO NEAR THORNDALE TO 6
MILES NORTHWEST OF FEDOR TO BASTROP TO NEAR CISTERN TO NEAR WAELDER
TO 7 MILES NORTH OF CHEAPSIDE...AND MOVING EAST AT 45 MPH.
WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
COLLEGE STATION...BRYAN...BRENHAM...NAVASOTA...SEALY...CALDWELL...
BELLVILLE...COLUMBUS...EAGLE LAKE...WASHINGTON...WEIMAR...
SOMERVILLE...SAN FELIPE...SNOOK...KURTEN...INDUSTRY...BURTON...WIXON
VALLEY...MILLICAN AND ANDERSON.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 AM CDT FOR SOUTHEASTERN
TEXAS.
LAT...LON 3070 9656 3074 9646 3091 9635 3104 9609
3037 9594 3012 9613 2966 9606 2961 9609
2963 9618 2941 9635 2929 9662 2933 9656
2963 9687 2996 9657 3015 9665 3016 9679
3030 9664 3032 9674 3056 9696
TIME...MOT...LOC 0741Z 268DEG 38KT 3071 9706 3060 9715 3035 9715 3011
9733 2981 9727 2965 9726 2938 9743Special weather statement, Apr 27, 3:11 AM CDT, 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
311 AM CDT MON APR 27 2015
TXZ163-164-176-177-197>199-270915-
MADISON TX-TRINITY TX-GRIMES TX-WALKER TX-WASHINGTON TX-HOUSTON TX-
MONTGOMERY TX-
311 AM CDT MON APR 27 2015
...SIGNIFICANT WEATHER ADVISORY FOR HOUSTON...NORTHEASTERN
WASHINGTON...WESTERN TRINITY...MADISON...WALKER...SOUTHEASTERN
BRAZOS...NORTHWESTERN MONTGOMERY AND GRIMES COUNTIES UNTIL 415 AM
CDT...
AT 310 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR PALESTINE TO 12 MILES
NORTHEAST OF FRANKLIN TO NEAR MILLICAN...AND MOVING EAST AT 30 MPH.
HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.
LOCATIONS IMPACTED INCLUDE...
HUNTSVILLE...NAVASOTA...CROCKETT...MADISONVILLE...AUSTONIO...
TRINITY...GRAPELAND...LOVELADY...MONTGOMERY...RIVERSIDE...BEDIAS...
KENNARD...LATEXO...MIDWAY...ANDERSON...HUNTSVILLE STATE PARK...
IOLA...RICHARDS...CRABBS PRAIRIE AND PENNINGTON.
A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 AM CDT FOR SOUTHEASTERN
TEXAS.
LAT...LON 3152 9510 3147 9510 3141 9498 3107 9525
3037 9563 3035 9629 3040 9620 3037 9615
3042 9608 3047 9614 3058 9618 3085 9617
3097 9624 3109 9598 3109 9577 3127 9573
3132 9566 3149 9573 3150 9574 3158 9517
TIME...MOT...LOC 0810Z 268DEG 25KT 3174 9574 3112 9631 3043 9628The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 7:15 PM CDT | Special Marine Warning | HGX | 90 min | |
| Apr 26, 7:24 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Galveston, Harris | 23 min |
| Apr 27, 2:40 AM CDT | River Flood Warning | HGX | Brazoria, Fort Bend, Wharton | 61 hr |
| Apr 27, 2:42 AM CDT | Special Weather Statement | HGX | Austin, Brazos, Burleson, Colorado, Grimes, Washington | 78 min |
| Apr 27, 3:11 AM CDT | Special Weather Statement | HGX | Grimes, Houston, Madison, Walker | 64 min |
| Apr 27, 3:44 AM CDT | Severe Thunderstorm Warning | HGX | Houston | 31 min |
| Apr 27, 3:52 AM CDT | Severe Thunderstorm Warning | HGX | Austin, Brazos, Burleson, Colorado, Fort Bend, Grimes and 6 more | 38 min |
| Apr 27, 3:59 AM CDT | Tornado Warning | HGX | Grimes, Montgomery, Walker | 31 min |
| Apr 27, 4:17 AM CDT | Areal Flood Advisory | HGX | Brazos, Grimes, Madison, Walker | 118 min |
| Apr 27, 4:17 AM CDT | Severe Thunderstorm Warning | HGX | Houston | 13 min |
| Apr 27, 4:27 AM CDT | Severe Thunderstorm Warning | HGX | Grimes, Harris, Liberty, Montgomery, Polk, San Jacinto and 1 more | 78 min |
| Apr 27, 4:33 AM CDT | Severe Thunderstorm Warning | HGX | Houston, Trinity | 27 min |
| Apr 27, 4:36 AM CDT | Tornado Warning | HGX | Polk, San Jacinto, Trinity, Walker | 39 min |
| Apr 27, 4:40 AM CDT | Severe Thunderstorm Warning | HGX | Houston, Polk, San Jacinto, Trinity, Walker | 35 min |
| Apr 27, 4:46 AM CDT | Areal Flood Advisory | HGX | Houston, Madison, Polk, San Jacinto, Trinity, Walker | 119 min |
| Apr 27, 4:52 AM CDT | Tornado Warning | HGX | Liberty, Polk, San Jacinto | 23 min |
| Apr 27, 5:24 AM CDT | Severe Thunderstorm Warning | HGX | Polk | 21 min |
| Apr 27, 5:40 AM CDT | Special Weather Statement | HGX | Brazos, Grimes, Houston, Madison, Montgomery, Polk and 3 more | 65 min |
| Apr 27, 5:42 AM CDT | Severe Thunderstorm Warning | HGX | Chambers, Harris, Liberty | 63 min |
| Apr 27, 5:48 AM CDT | Special Weather Statement | HGX | Liberty | 42 min |
| Apr 27, 6:45 AM CDT | Special Weather Statement | HGX | Liberty | 45 min |
| Apr 27, 1:56 PM CDT | Special Weather Statement | HGX | Liberty | 34 min |
| Apr 27, 2:44 PM CDT | Special Marine Warning | HGX | 46 min | |
| Apr 27, 3:29 PM CDT | Special Marine Warning | HGX | 61 min | |
| Apr 27, 3:31 PM CDT | Special Marine Warning | HGX | 44 min | |
| Apr 27, 3:41 PM CDT | Small Craft Advisory | HGX | 6 hr | |
| Apr 27, 3:41 PM CDT | Small Craft Advisory | HGX | 39 hr | |
| Apr 27, 4:19 PM CDT | Special Marine Warning | HGX | 56 min | |
| Apr 27, 4:47 PM CDT | Special Weather Statement | HGX | Chambers | 43 min |
| Apr 27, 5:13 PM CDT | Special Weather Statement | HGX | Grimes | 47 min |
| Apr 27, 5:55 PM CDT | Special Weather Statement | HGX | Grimes, Washington | 35 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015
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.