Alert archive / Arkansas / Freeze Warnings in 2009

Freeze Warning 2, NWS Shreveport, LA

March 31, 2009Howard County, Sevier County, Arkansas

NWS Shreveport, LA issued this freeze warning at Mar 31, 2009, 3:30 PM CDT for Howard County, Sevier County, Arkansas. It took effect at Apr 1, 2009, 12:00 AM CDT. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 31, 2009, 3:30 PM CDT (20:30 UTC)
In effect from: Apr 1, 2009, 12:00 AM CDT
Expired: Apr 1, 2009, 8:00 AM CDT
In force: 8 hr
Issued by: NWS Shreveport, LA

Counties Howard County, AR, Sevier County, AR

The radar

The Western Arkansas radar (KSRX), 141 km from the middle of the area, began a volume at 20:28 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

Shreveport, LA (KSHV), launched 12:00Z, 8.5 hours before the alert went out and 177 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: 716 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Mar 31, 2:45 PM CDT, 45 minutes earlier.

Area forecast discussion, Mar 31, 2:45 PM CDT, 45 minutes before

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Hazardous weather outlook, Mar 31, 12:00 PM CDT, 3 hours 30 minutes before

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In the hours before

Local storm report, Mar 31, 9:50 AM CDT, 5 hours 40 minutes before

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Local storm report, Mar 31, 9:54 AM CDT, 5 hours 36 minutes before

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Local storm report, Mar 31, 9:57 AM CDT, 5 hours 33 minutes before

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Local storm report, Mar 31, 10:01 AM CDT, 5 hours 29 minutes before

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Local storm report, Mar 31, 2:12 PM CDT, 1 hour 18 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
Mar 31, 3:39 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk	51 min
Mar 31, 3:57 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Harrison, Nacogdoches, Panola, Rusk, Shelby	48 min
Mar 31, 4:23 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	52 min
Mar 31, 5:06 AM CDT	Severe Thunderstorm Warning	SHV	Panola	24 min
Mar 31, 5:27 AM CDT	Severe Thunderstorm Warning	SHV	Panola	48 min
Mar 31, 6:26 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Shelby	49 min
Mar 31, 7:11 AM CDT	Severe Thunderstorm Warning	SHV	Shelby	49 min
Mar 31, 8:27 AM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	48 min
Mar 31, 8:31 AM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	29 min
Mar 31, 9:22 AM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	38 min
Mar 31, 9:45 AM CDT	Severe Thunderstorm Warning	SHV	LaSalle	30 min

Nearby

Freeze Warnings in Arkansas, 2009 Every freeze warning in 2009

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.