June 12, 2002: Convective Cells w/ Hail Signatures in Woods and Kay Counties Author: Pam Heinselman, CIMMS/OU Last Updated: 28 April 2003

Forecast/Weather:

On 12 June 2002, strong convective cells developed north of KOUN. Data collection occurred during two periods: 13:28-16:13 UTC and 22:39-23:54 UTC. In the first period, convective cells developed north of KOUN and moved southeastward. The KDP signatures suggested that heavy rain fell from some of these storms (see first set of Figs. 1-4). In the second period, convective cells developed north of KOUN again and moved eastward. Two of the cells contain hail signatures between 23:29-23:54 (Wood and Kay COs in northern OK; see second set of Figs. below).

Radar Operations:

Start time: 13:28 6/12/02 UTC (08:28 6/12/02 local time)
Stop time: 16:13 6/12/02 UTC (11:13 6/12/02 local time)

Start time: 22:39 6/12/02 UTC (17:39 6/12/02 local time)
Stop time: 23:54 6/12/02 UTC (18:54 6/12/02 local time)

Radar/Operational Status:

Hydrometeor Classification Algorithm: Cold season

Operational Delivery:

Not applicable.

Snapshots:

Convective cell development during the morning north-northeast of KOUN. Note radials of mixed hydrometeors, possibly containing hail.

Figure 1: Reflectivity at 14:09 UTC 12 June 2002.

Figure 2: Correlation coefficient at 14:09 UTC 12 June 2002.

Figure 3: Specific differential phase at 14:09 UTC 12 June 2002.

Figure 4: Differential reflectivity at 14:09 UTC 12 June 2002.

Convective cells w/ hail signatures during the early evening north of KOUN.

Figure 1: Reflectivity at 23:29 UTC 12 June 2002.

Figure 2: Correlation coefficient at 23:29 UTC 12 June 2002.

Figure 3: Specific differential phase at 23:29 UTC 12 June 2002.

Figure 4: Differential reflectivity at 23:29 UTC 12 June 2002.

Figure 5: Reflectivity at 23:41 UTC 12 June 2002.

Figure 6: Correlation coefficient at 23:41 UTC 12 June 2002.

Figure 7: Specific differential phase at 23:41 UTC 12 June 2002.

Figure 8: Differential reflectivity at 23:41 UTC 12 June 2002.

Figure 9: Reflectivity at 23:54 UTC 12 June 2002.

Figure 10: Correlation coefficient at 23:54 UTC 12 June 2002.

Figure 11: Specific differential phase at 23:54 UTC 12 June 2002.

Figure 12: Differential reflectivity at 23:54 UTC 12 June 2002.