Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 195, NWS Shreveport, LA

May 23, 2020Red River County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 23, 2020, 2:19 AM CDT for Red River County, Texas. It was in force for 56 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: May 23, 2020, 2:19 AM CDT (07:19 UTC)
Expired: May 23, 2020, 3:15 AM CDT
In force: 56 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Red River County, TX

The radar

The Shreveport radar (KSHV), 172 km from the middle of the area, began a volume at 07:22 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
May 22, 7:34 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 7.3 hours before the alert went out and 226 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2660 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1650 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.6

Open this sounding in Storm Lab

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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 23, 12:31 AM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, May 23, 12:31 AM CDT, 1 hour 48 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
1231 AM CDT Sat May 23 2020

.AVIATION...

Convection currently across the extreme northern portion of our
airspace early this morning. Whether or not this convection comes
south into our I-20 Corridor terminal locations is anyone's guess
but given the abundance of guidance that shows an acceleration
overnight towards the pre and post down hours further south, went
ahead and began mentioning VCTS from north to south through the
morning hours leaving mention out of the LFK/MLU terminals until
later this afternoon. Otherwise, look for IFR/MVFR ceilings to
return north this morning as was the case on Friday with ceilings
eventually becoming VFR or scattering out this afternoon outside
of convection.

Winds will be mostly southerly to southeasterly near 10kts with
much higher gradient gusts across our western terminals and of
course in association with convection.

Eventually, we will a return to VFR conditions areawide by this
afternoon into the evening hours.

13

&&

.PREV DISCUSSION... /issued 910 PM CDT Fri May 22 2020/

UPDATE...
The latest run of the HRRR is capturing the ongoing severe convection
in S OK/N TX quite well and has it moving into the I-30 corridor
just before midnight tonight. Currently, only McCurtain County is
in a Severe Thunderstorm Watch in our area; will have to closely
monitor this situation as the evening progresses. This activity will
spread slowly eastward into SW AR into the early morning hours,
thus will not make any major changes to the forecast at the
moment.

35

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  71  87  70  83 /  10  50  40  60
MLU  72  89  70  87 /  10  40  20  50
DEQ  68  85  67  82 /  10  50  60  70
TXK  70  85  69  82 /  10  50  50  70
ELD  70  88  69  85 /  10  30  30  60
TYR  72  84  69  80 /  10  60  50  70
GGG  71  86  68  82 /  10  60  50  60
LFK  72  87  69  83 /  10  60  40  60

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...None.
LA...None.
OK...None.
TX...None.
&&

13/35

In the hours before

Special weather statement, May 23, 12:21 AM CDT, 1 hour 58 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1221 AM CDT Sat May 23 2020

OKZ077-230615-
McCurtain OK-
1221 AM CDT Sat May 23 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN MCCURTAIN COUNTY UNTIL
115 AM CDT...

At 1221 AM CDT, Doppler radar was tracking a strong thunderstorm 17
miles northwest of Broken Bow, or 35 miles northeast of Hugo, moving
northeast at 25 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Mount Herman, Sherwood and Bethel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
southeastern Oklahoma.

LAT...LON 3426 9453 3415 9502 3429 9505 3431 9504
      3445 9460
TIME...MOT...LOC 0521Z 244DEG 20KT 3421 9494

19

Local storm report, May 23, 12:45 AM CDT, 1 hour 34 minutes before

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Local storm report, May 23, 1:15 AM CDT, 1 hour 4 minutes before

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Local storm report, May 23, 1:16 AM CDT, 1 hour 3 minutes before

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Special weather statement, May 23, 1:44 AM CDT, 35 minutes before

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Special weather statement, May 23, 1:57 AM CDT, 22 minutes before

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The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 22, 7:29 PM CDT	Special Weather Statement	SHV	Wood	46 min
May 22, 11:56 PM CDT	Severe Thunderstorm Warning	SHV	Red River	64 min
May 23, 2:51 AM CDT	Special Weather Statement	SHV	Camp, Franklin, Red River, Titus	39 min
May 23, 3:37 AM CDT	Special Weather Statement	SHV	Bowie, Camp, Cass, Morris	38 min
May 23, 4:12 AM CDT	Special Weather Statement	SHV	Bowie, Camp, Cass, Morris	48 min
May 23, 5:02 AM CDT	Special Weather Statement	SHV	Marion	43 min
May 23, 5:10 AM CDT	Special Weather Statement	SHV	Camp, Gregg, Smith, Upshur, Wood	50 min
May 23, 5:55 AM CDT	Special Weather Statement	SHV	Gregg, Marion, Morris, Smith, Upshur	50 min
May 23, 6:59 AM CDT	Special Weather Statement	SHV	Cherokee, Harrison, Panola, Rusk	46 min
May 23, 4:56 AM CDT	Special Weather Statement	SHV	Claiborne, Union	34 min
May 23, 7:13 AM CDT	Special Weather Statement	SHV	Bossier, Claiborne, Webster	47 min
May 23, 12:46 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	59 min
May 23, 1:44 AM CDT	Special Weather Statement	SHV	Howard	46 min
May 23, 3:10 AM CDT	Special Weather Statement	SHV	Sevier	65 min
May 23, 3:18 AM CDT	Special Weather Statement	SHV	Howard	27 min
May 23, 3:53 AM CDT	Special Weather Statement	SHV	Howard, Sevier	52 min
May 23, 4:41 AM CDT	Areal Flood Advisory	SHV	Hempstead, Howard	3 hr
May 23, 5:44 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette, Nevada	46 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every severe thunderstorm warning in 2020

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.