Alert archive / Oklahoma / Freeze Warnings in 2009

Freeze Warning 3, NWS Tulsa, OK

April 2, 200921 counties in Oklahoma; 4 counties in Arkansas

NWS Tulsa, OK issued this freeze warning at Apr 2, 2009, 3:42 PM CDT for 21 counties in Oklahoma; 4 counties in Arkansas. It took effect at Apr 2, 2009, 10:00 PM CDT. It was in force for 11 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: Apr 2, 2009, 3:42 PM CDT (20:42 UTC)
In effect from: Apr 2, 2009, 10:00 PM CDT
Expired: Apr 3, 2009, 9:00 AM CDT
In force: 11 hr
Issued by: NWS Tulsa, OK

All 25 counties

Benton County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okfuskee County, OK, Okmulgee County, OK, Ottawa County, OK, Pawnee County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 37 km from the middle of the area, began a volume at 20:46 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

Springfield, MO (KSGF), launched 12:00Z, 8.7 hours before the alert went out and 170 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2001 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Tulsa, OK wrote its last area forecast discussion before this freeze warning went out at Apr 2, 2:49 PM CDT, 53 minutes earlier.

Area forecast discussion, Apr 2, 2:49 PM CDT, 53 minutes before

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Hazardous weather outlook, Apr 2, 1:01 PM CDT, 2 hours 41 minutes before

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The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 2, 4:02 AM CDT	Wind Advisory	TSA	Choctaw, Craig, Creek, Haskell, Latimer, McIntosh and 12 more	12 hr

Nearby

Freeze Warnings in Oklahoma, 2009 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.